Difference between revisions of "Gemstone-like compound"

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Diamondoid materials encompass all materials that:
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''In the future we will build with gemstones.''
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[[File:Moissanite-semitransparent.jpg|thumb|400px|Depicted is '''[[moissanite]] which is gemstone grade silicon carbide (SiC)''' – a typical gemstone-like material – without impurities it would be colorless and transparent - the silicon makes this material fireproof in bulk blocks – unlike [[diamond]] which can burn – (but also inhibits the possibility to intentionally burn it up) – heating it to extreme temperatures it just turns into glassy [[slag]] – See: [[Diamondoid waste incineration]] and [[Recycling]].]]
  
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* do not [[diffusion|diffuse]] at room temperature
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= Definition – What is a gemstone like compound? =
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* are stiff enough to keep their shape under thermal movement
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* have dense three dimensional networks of covalent bonds - (short bond loops => no polymeres)
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* (not necessarily but desirable) do not react or dissolve in water
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The main '''reason why diamondoid materials are the material of choice''' for [[diamondoid molecular elements]] DMEs (the constituents of [[technology level III| artificial advanced AP systems]]) is that they '''do not jitter and wobble or even [[diffusion|diffuse]] away''' while they are [[mechanosynthesis|built robotically]] (a blind process) and that products out of those systems can be made so that they only have one to a few tightly controlled degrees of freedome. This way one can test one action at a time which enables engineering with fast progress.
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Gemstone like materials encompass all materials that ...
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A systems design that poses the necessity for scientific entangling of convoluted relationships is usually considered bad. Natural nanosystems are like this because of random incremental evolution in small steps without lookahead. In this regard one obviously shouldn't copy from nature.
+
  
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Wikipedia has its own page about diamondoid materials. See here: [https://en.wikipedia.org/wiki/Diamondoid]
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* ... have their atoms not moving around on their surfaces at room temperature but have them stay where they are for decades to eons. (they do not [[diffusion transport|diffuse]])
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* ... are stiff enough to keep their shape under thermal movement at room temperature (this excludes all of today's plastic polymers)
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* ... have dense three dimensional networks of covalent bonds like gemstones - (short bond loops prevent rotations around single bonds)
 +
 
 +
These properties are polar opposition to '''[[pure metals and metal alloys]]'''. <br>
 +
Follow the link to see the reverse perspective explaining why they are not well suited for [[gem based APM]].
 +
 
 +
= Use – What are gemstone like compound good for? =
 +
 
 +
Gemstone like materials ...
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* ... serve as the fundamental basis for an unimaginably wide variety of possible [[gemstone based metamaterial]]s.
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* ... include many [[neo-polymorph]]ic compounds that currently can't be produced (via [[thermodynamic means]]).
 +
 
 +
= Introduction =
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 +
== Why the focus on gemstone like compounds ==
 +
 
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Gemstone-like (or more narrow '''diamondoid''') compounds are the material of choice for:
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* [[crystolecule]] based nanoscale machine elements
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* [[crystolecule]] based nanoscale structural elements
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[[Crystolecule]] and their assemblies ([[microcomponents]]) and <br>
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all forms and fashions of assemblies of both of them into [[gemstone based metamaterial]]s are <br>
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what is the essence of the products of [[technology level III|advanced future gem-gum technology]].)
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=== Lower error rates in assembly & Products not decaying away just from room temperature heat ===
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The main reason for why gemstone like compounds are the material of choice here is that
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at room temperature their atoms do not jitter and wobble around too strongly or even [[diffusion transport|diffuse]] away.
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This is important
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* in the final product that should not start quickly decaying the moment it finished assembly
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* in the assembly process where [[crystolecule]]s pout of [[gemstome like compound]]s are [[piezochemical mechanosynthesis|built up almost atom by atom via robotic manipulation]].
 +
 
 +
For the assembly process more specifically one needs to choose a gemstone like compound that is sufficiently stiff such that a manipulator made out of this compound can keep the amplitudes of the thermal vibrations that occur at the manipulators tip sufficiently smaller than the lattice spacing of the work-piece that is made out of the same (or an other) gemstone like compound. This way placement errors can be suppressed. That is: errors can be made very very rare, like bit errors in digital computing.
 +
(Related: [[Lattice scaled stiffness]])
 +
 
 +
Low error rates are also important in light of that in final production devices
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the assembly process is for the most part a [[open loop control|a blind process]] that can't see or correct its own errors.
 +
 
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=== Rigid bodies are easier to work with than floppy jiggly folding fluff ===
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Products out of gemstone like (diamondoid) materials can be made so that they only have one to a few tightly controlled degrees of freedom (axles rails).  
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This is unlike soft nanoscale machinery like in biology wher pushing in on one side all sort of predictable to massively unpredictable things can and often will happen.
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With only a few clearly defined independent degrees of freedoms for motions one can more easily test one action at a time (Related: [[Microcomponent maintenance unit]]s).
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This is a fundamental engineering principle that allows for faster progress.
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In contrast a systems design that poses the necessity for scientific entangling of convoluted relationships is usually considered bad.
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Natural nanosystems (e.g. like e.g. the case in soft natural proteins with barely predictable folding and behavior as present in living cells) are like this.
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Likely because of random incremental evolution in small steps without any far look-ahead that only higher thought would enable.
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In this regard one obviously shouldn't [[copying from nature|copy from nature]].
 +
 
 +
== Stability against water and other chemicals ==
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Gemstone like compounds that are intended to be used on the surface of products have additional requirements on [[chemical stability]].
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First and foremost in most cases one wouldn't want them to be water soluble.
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But resilience against stronger acids bases and oxidizers may be desired too.
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This drastically restricts the range of usable compounds when it comes to the surfaces of products.
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The majority of the material a product is made out of lives well isolated on the inside of the bulk product.
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Thus for most of the products total volume (all the inner volume) the wider less chemically stable range of material is open for usage.
 +
 
 +
=== Adding protective hulls and compartmentalization as a workaround ===
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It's a bit like the protective skin of fruits. The outer skin must be made out of a much more chemically stable material than the delicate inside
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and once the inside is exposed it may quickly decay. (Related: [[Passivation]], [[Surface passivation]], [[Biological analogies]])
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Unlike in fruits though [[gemstone based metamaterial]] can be made designed to be [[micro-compartmentalized]].
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That is: Each and every [[microcomponent]] may have a hull out of a few chemically highly stable [[gemstone like compound]]s 
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and an interior with a greater range of much less chemically stable [[gemstone like compound]]s.
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<small>A good design could make breaking up some microcomponents by macroscopic impact nigh impossible.
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Well, excluding hyper-velocity impacts here, like those one would expect when space debris impacts into spacecraft hull. </small>
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=== How material solubility and environmental friendlyness relate ===
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Extensive usage of water dissolvable materials out of non toxic elements may even help biodegradability.
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Products should though be designed in a way that non-water-dissolvable nanoscale parts can't [[splinter prevention|come loose]] individually (or sparsely and fragilely connected). A worst case scenario would be that due to bad designs huge quantities of water (and acid) undissolvable nanoscale parts come loose spill into the environment accumulate there and eventually cause lots of harm to animal and human life.
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== Difference to normal gemstones and relation to metamaterials ==
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By [[mechanosynthesis|mechanosynthesizing]] gemstone like materials one can go far beyond the known polymorphs (or allotropes).
 +
 
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* "Polymorphs" are various crystal structures of one and the same chemical formula. – Example: [[rutile]] and [[anatase]] are both TiO<sub>2</sub>)
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* "Allotropes" are are the polymorphs of compounds made from one single element compounds. – Example: [[diamond]] and [[lonsdaleite]] are both pure carbon (C)
 +
 
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One can go far beyond all the phases that are reachable by [[conventional thermodynamic means of material production]] (means that all lack atomically precise control).
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The newly accessible phases of the same old mundane chemical formulas include ones that are thermodynamically unstable nonetheless strongly metastable.
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A peculiarly interesting case may be [[stishovite]]. Here a material with the well known formula SiO<sub>2</sub> (which usually points to our good old friend [[quartz]]) suddenly makes an enormously hard and dense material.
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 +
For more info about emulating some exotic material properties by complex atomic substitutions in [[gemstone like compounds]] <br>
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see main article: '''[[Low level gemstone metamaterials]]''' and page: [[Neo-polymorph]]s
  
 
= Carbons versatility =
 
= Carbons versatility =
  
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By the time of writing (2014) and the time of last review '''(2015) carbon is the only building material for which extensive studies about [[tooltip chemistry]] have been undertaken.''' <br>
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By the time of last review (2017) '''carbon is the only building material for which extensive studies about [[tooltip chemistry]] have been undertaken'''.
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Note that just by structuring carbon (and adding a bit hydrogen as [[surface passivation|passivation]] agent) many material properties will be archivable.
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This is because diamondoid materials go far beyond the known [//en.wikipedia.org/wiki/Allotrope allotropes] and thermodynamically stable phases. They extend into the set of low level and [[diamondoid metamaterials|high level metamaterials]].
+
  
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'''Low level metamarterials''' include very stable patterns that are highly ordered. Those patterns may include vacancies and may have periods of repitition of arbitrary length.
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Carbon (especially in the form of [[diamond]]) has been chosen because it constitutes a particularly difficult far term test case for [[exploratory engineering]]. It has not been chosen as an easy to reach near term objective to [[direct path|target directly]].
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Their structural alterations are small enough to influence properties that originate at such low size levels e.g. chemical electrical magnetical and other properties (especially relevant for the [[non mechanical technology path]]).
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A simple example of a low level metamaterial is when donation atoms are embedded in a checkerboard or other exactly periodic pattern.  
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The set of sufficiently [[metastable]] low level metamaterials is significantly bigger than the set of designed materials that can today (2014) be cooked together by macroscopic means. This set of designed materials favours random mixing because they require very restrictive good thermodynamic accessibility.
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The distinction between low level metamaterials and [[diamondoid metamaterials|high level metamaterials]] may be difficult in some cases. Conventially doped semiconductors for example are not called metamaterials.
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By structuring just carbon alone, with just a bit hydrogen as [[surface passivation|passivation]] agent (no further elements), to [[gemstone based metamaterial|mechanical metamaterials]] many material properties will be achievable.  
  
 
Beyond [[tooltip chemistry|carbon from acetylene and methane]] many further studies are needed most importantly:
 
Beyond [[tooltip chemistry|carbon from acetylene and methane]] many further studies are needed most importantly:
Line 33: Line 112:
 
Carbon nanotubes can replace the scarce element copper for electrical cables.
 
Carbon nanotubes can replace the scarce element copper for electrical cables.
  
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=Diamondoid compounds=
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== gemstone-like vs diamondoid ==
  
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Please keep in mind that all compounds we know of today are only those few we can create by mixing and cooking various elements or preproduced compounds together. With mechanosynthesis many more will be accessible. Although they're not in a thermodynamic minimum they'll be very stable at room temperature. A recent example is the theoretical prediction of the stability of graphitic pentagonal carbon sheets with the so called cairo pattern. The "few" compounds we can create by mixing and cooking them together are all the minerals that are documented today. These will be surveyed here. Many more meta-stable compounds will become mechanosynthesizable though for most applications the allotropes of carbon alone will suffice.
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Instead of "gemstone like compound" the term "'''diamondoid compound'''" can be used.
  
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== List of potential structural compounds ==
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This may have a more restrictive meaning limiting focus towards compounds that are easy to passivate and thus more suitable for machine elements with sliding interfaces.
 +
This primarty entails the exclusion of salts (like e.g. Periclase MgO) and secondary the exclusion of big class of metal oxides, sulfides, nitrides and related compounds (e.g. [[Leukosapphire|Sapphire]], Pyrite, titanium nitride (Osbornite), ...)
  
 +
Related: The too strong exclusive focus on diamond only. See: "[[Pathway controversy]]".
  
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* [[Diamondoid biominerals]] ... compounds that are synthesizable under solution are of interest for [[technology level II]] to bridge the gap between [[technology level I]] and [[technology level III|III]].
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= Gemstone like compounds =
  
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* [[Binary diamondoic compounds]]
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Please keep in mind that all compounds we know of today are only those few we can create by mixing and cooking various elements or preproduced compounds together. With [[mechanosynthesis]] many more will be accessible. Although they're not in a thermodynamic minimum they'll be very stable at room temperature. A recent example is the theoretical prediction of the stability of graphitic pentagonal carbon sheets with the so called cairo pattern. The "few" compounds we can create by mixing and cooking them together are all the minerals that are documented today. These will be surveyed here. Many more meta-stable compounds will become mechanosynthesizable though for most applications the allotropes of carbon used in their high level metamaterial configurations alone will suffice.
  
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Taking the rock forming mineral quartz one finds several natural polymorphs. The "quartz group". <br>
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Beyond those natural polymorphs [[Neo-polymorph]]s of SiO<sub>2</sub> will be accessible via [[mechanosynthesis]] <br>
 +
which are (albeit their deviation from thermodynamic equilibrium) very stable but not accessible today.
  
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Metamaterials made from the basic diamondoid materials are able to emulate a lot of physical properties.
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See main article: '''[[Polymorphs of silicon dioxide]]''' and [[pseudo phase diagrams]]
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Further binary ternary or higher diamondoid materials can complicate engineering design due to
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* low symmetry in their crystal structure
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* complex or polar surface structure which may be difficult to passivate
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* lack of tensile strength
+
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* ...
+
  
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thus they may predominantly find use for special applications like as:
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== Lists of potential structural compounds ==
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* slowly water dissolvable materials for better biodegradability
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* laser gain materials
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* infill materials
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* materials with special electrical magetical or other exotic non high level emulatable properties
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== pure elements ==
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For especially interesting ones check out: "[[Charts for gemstone-like compounds]]"
  
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* '''carbon''' sp3 network allotropes: [http://en.wikipedia.org/wiki/Diamond diamond], [http://en.wikipedia.org/wiki/Material_properties_of_diamond diamonds known properties], [http://en.wikipedia.org/wiki/Lonsdaleite lonsdaleite]; sp2 allotropes: fullerenes, graphitic networks
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=== early materials ===
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* B [http://en.wikipedia.org/wiki/Allotropes_of_boron ~four allotropes of elementar boron]
+
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* Si [http://en.wikipedia.org/wiki/Silicon silicon] (also cubic or hexagonal)
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==== drawn from the atmosphere ====
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* '''[[gem-like biominerals]]''' ... compounds that are synthesizable under solution are of interest for [[technology level II]] to bridge the gap between [[technology level I]] and [[technology level III|III]].
  
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Oxygen and nitrogen rich compounds like SiO<sub>2</sub> and Si<sub>3</sub>N<sub>4</sub> are interesting because more than half of this material can be drawn directly from the atmosphere. When atmospheric carbon dioxide is used carbon allotropes and β-C<sub>3</sub>N<sub>4</sub> can be drawn 100% from the air.
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=== pure elements ===
  
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==== back to the atmosphere ====
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* C '''carbon''' sp3 network allotropes: [[diamond]], [http://en.wikipedia.org/wiki/Lonsdaleite lonsdaleite]; sp<sup>2</sup> allotropes: fullerenes, graphitic networks
 +
* Si [http://en.wikipedia.org/wiki/Silicon silicon] (also cubic or hexagonal)
 +
* B [http://en.wikipedia.org/wiki/Allotropes_of_boron ~four allotropes of elementar boron] (may be difficult to use)
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* P & S allotropes of phosphorus and sulfur (may be difficult to use because of what follows below)
  
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When [[Diamondoid waste incineration|burning]] diamondoid materials (hopefully in a smart way - thus only in traces - see [[recycling]]) it strongly depends on the type of chosen material whether they convert to gasses or just reform to a glassy slag. In the latter case it will be more difficult to recover the elements in pure form.
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=== some classifications: (a high dimensional overlapping space of possibilities) ===
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The rough rule is: When heated under oxygen mainly carbon based materials burn up almost completely while silicon or metal oxide based materials just melt to a slag. Everything in between could be possible.
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Certain combinations of elements can become dangerous when burned together as we know from the PVC dioxine problem.
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===ternary and higher compounds===
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* '''[[Base materials with high potential]]'''
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* [[Simple crystal structures of especial interest]]
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----
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* '''[[Binary gem-like compound]]s'''
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* Gem-like compounds that contain (partially abundant) '''[[s-block metals]]'''
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* '''[[Ternary and higher gem-like compounds]]''' (including cubic garnets)
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* [[refractory materials]]
 +
----
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* Gem-like compounds containing elements of '''[[the boron group]]'''
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* [[high pressure modifications]]
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* [[electrically conductive gem-like compounds]]
  
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Look out for rock forming minarals here. <br>
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=== Issues with more complex compounds ===
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Alkali and earth alkali compounds tend to be rather soluble in binary compounds in ternary and higher compounds they tend to form less water soluble minerals.
+
  
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* Ca(OH)<sub>2</sub> [http://en.wikipedia.org/wiki/Calcium_hydroxide calcium hydroxide aka slaked lime] (rather water soluble)
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[[Metamaterial]]s made from the basic gemstone-like materials are able to emulate a lot of physical properties. <br>
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* CaCO<sub>3</sub> [http://en.wikipedia.org/wiki/Caco3 calcium carbonate] (very slightly soluble)
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Further binary ternary or higher gemstone-like materials can complicate engineering design due to:
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* MgCO<sub>3</sub> [https://en.wikipedia.org/wiki/MgCO3 magnesium carbonate aka magnesite] (slightly soluble)
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* low symmetry in their crystal structure - See: [[Isotropy of materials]]
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* Mg<sub>3</sub>B<sub>7</sub>O<sub>13</sub>Cl [http://en.wikipedia.org/wiki/Boracite boracite] (very slightly water soluble)
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* porousness due to bridge bonding like present in all [[salts of oxoacids]] X-O-X (X can be e.g. Si,Al,P,...) and some other compounds
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* ... many more
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* complex or polar surface structure which may be difficult to [[surface passivation|passivate]]
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* lack of tensile strength
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* ...
  
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In the earths mantle and crust silicon and oxygen are the most abundant elements.
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thus they may predominantly find use for special applications like as:
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On the borther to earths outer core this changes to iron and nickle.
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* slowly water dissolvable materials for better biodegradability
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Down there the most abundant minearls are made from mixture of those elements: [http://en.wikipedia.org/wiki/Olivine olivine/peridot]
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* laser gain materials
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Of interest as diamondoid materials may be the pure end members of the mixing series:
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* infill materials
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* [http://en.wikipedia.org/wiki/Fayalite Fayalite] Fe<sub>2</sub>SiO<sub>4</sub>
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* materials with special electrical magnetical or other exotic non high level emulatable properties
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* [http://en.wikipedia.org/wiki/Forsterite Forsterite] Mg<sub>2</sub>SiO<sub>4</sub>
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* ...
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* [http://en.wikipedia.org/wiki/Tephroite Tephroite] Mn<sub>2</sub>SiO<sub>4</sub> (less interesting since Mn is more scarce)
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* [http://www.americanelements.com/titanium-silicate-nanopowder.html Titanium Silicate] TiSiO<sub>4</sub>
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* [http://en.wikipedia.org/wiki/Titanite Titanite or Sphene] CaTiSiO<sub>5</sub> (optical dispersion exceeding diamond; birefringent)
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In nature when iron rich metal is available in stochiometric excess heterogenous [http://en.wikipedia.org/wiki/Pallasite pallasite] is formed. This rock looks really beautiful and can be found in some meteroids.
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In the following classifications section you'll find a lot of links to wikipedia articles about '''gem-grade minerals with very beautiful pictures'''. Please note that the colors you see are in most of the cases due to small impurities and not inherent to the minerals themselves. Most (electrically non conductive) minerals will be completely transparent when built defect and impurity free.
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An extreme example is silicon carbide known as a black solid but in single crystalline form it's called mossianite and completely transparent.
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Color should be intentionally addable by mechanosynthetic sparse checkerboard dotation.
  
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Another interesting tertiary material would be CSiO<sub> 4</sub> <br>
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=== compounds which contain relatively scarce elements ===
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a solid intermediate material between CO<sub>2</sub>(gas) SiO<sub>2</sub>(solid quartz): [http://www.ncbi.nlm.nih.gov/pubmed/24781844]
+
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+
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===compounds which contain relatively scarce elements ===
+
  
 
Those may be useful in the lower technology levels or special tooltip chemistry where only very small amounts are needed (e.g. germaium containing tips).
 
Those may be useful in the lower technology levels or special tooltip chemistry where only very small amounts are needed (e.g. germaium containing tips).
  
 
* molybdenium oxide structures
 
* molybdenium oxide structures
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* germanium compounds
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* [[germanium]] compounds
 
* ... many more
 
* ... many more
  
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'''Carbon''' is planned to be drawn from [[//en.wikipedia.org/wiki/Acetylene ethyne]] more commonly known as the welding gas acetylene. It has the advantage of a triple bond that when partly split up provides four unpassivated bonds and it's carrying around a minimal amount of hydrogen. Since [[diamondoid molecular elements| DMEs]] are compact and crystal like they have a lot less surface than the source molecules and thus require a lot less hydrogen passivation.
 
'''Carbon''' is planned to be drawn from [[//en.wikipedia.org/wiki/Acetylene ethyne]] more commonly known as the welding gas acetylene. It has the advantage of a triple bond that when partly split up provides four unpassivated bonds and it's carrying around a minimal amount of hydrogen. Since [[diamondoid molecular elements| DMEs]] are compact and crystal like they have a lot less surface than the source molecules and thus require a lot less hydrogen passivation.
−
Ethyne cant be delivered in highly compressed gasseous form since it explosively decomposes. It is hardly soluble in water but well soluble in acetone ethanol or [//en.wikipedia.org/wiki/Dimethylformamide dimethylformamide]. Ethyne can be manufactured by the partial combustion of methane and thus potentially be gained from renewable resources.
+
Ethyne cant be delivered in highly compressed gaseous form since it explosively decomposes. It is hardly soluble in water but well soluble in acetone ethanol or [//en.wikipedia.org/wiki/Dimethylformamide dimethylformamide]. Ethyne can be manufactured by the partial combustion of methane and thus potentially be gained from renewable resources.
  
 
If one looks at the most common '''or most easily accessible''' elements and their simplest compounds one finds a list of potential structural building materials: <br>
 
If one looks at the most common '''or most easily accessible''' elements and their simplest compounds one finds a list of potential structural building materials: <br>
 
Link to a [//en.wikipedia.org/wiki/File:Elemental_abundances.svg graphic of the most common elements in the earths crust] from Wikimedia Commons.
 
Link to a [//en.wikipedia.org/wiki/File:Elemental_abundances.svg graphic of the most common elements in the earths crust] from Wikimedia Commons.
  
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Most easily accessible are '''nitrogen oxygen''' and argon since they can direcly be drawn from the atmosphere. <br>
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Most easily accessible are '''nitrogen oxygen''' and argon since they can directly be drawn from the atmosphere. <br>
 
'''To investigate:'''
 
'''To investigate:'''
 
* Means for filtering/capturing N<sub>2</sub> and O<sub>2</sub> each selectively from the atmosphere.
 
* Means for filtering/capturing N<sub>2</sub> and O<sub>2</sub> each selectively from the atmosphere.
 
* Mechanosynthetic tooltips and manipulations to gain reactive [[Moiety|moieties]] out captured N<sub>2</sub> and O<sub>2</sub>.
 
* Mechanosynthetic tooltips and manipulations to gain reactive [[Moiety|moieties]] out captured N<sub>2</sub> and O<sub>2</sub>.
  
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Chlorine could be drawn from common salt leaving behind sodium.
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==== drawn from the atmosphere ====
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To get this residual into a nonreactive environmentally acceptable form that could be used as structural material rather than just constituting waste one could chose from [//en.wikipedia.org/wiki/Category:Sodium_minerals sodium minerals].
+
−
To prefer are compounds with no crystal water and simple formulas with only elements of high importance for APM (that is which we are likely to gain control of soon after reaching [[technology level III]]) like e.g. [//en.wikipedia.org/wiki/Jadeite jadeite] and further ones '''to find'''.
+
  
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== The s-block metals ==
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Oxygen and nitrogen rich compounds like SiO<sub>2</sub> and Si<sub>3</sub>N<sub>4</sub> are interesting because more than half of this material can be drawn directly from the atmosphere. When atmospheric carbon dioxide is used carbon allotropes and β-C<sub>3</sub>N<sub>4</sub> can be drawn 100% from the air.
  
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The lighter ones of the alkali- and alkaline earth metals (the non-noble metals in the left s-block of the periodic table) belong to the most abundant elements around.
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==== back to the atmosphere ====
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Thus its an iteresting question wheter those elements can be combined with other abundant ones to make
+
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structural building materials.
+
  
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The s-block metals need to be combined with other elements not only because metals are not very suitable for mechanosynthesis but also because they are extremely reactive in pure form. A self passivation oxide layer film like the one that macroscopic blocks of magnesium have is obviously not possible on nano sized building blocks.
+
When [[Diamondoid waste incineration|burning]] diamondoid materials (hopefully in a smart way - thus only in traces - see [[recycling]]) it strongly depends on the type of chosen material whether they convert to gasses or just reform to a glassy slag. In the latter case it will be more difficult to recover the elements in pure form.
−
In contact to air oxidation would go down right to the core of the building block and blow up the part twice in volume destroying it completely.
+
The rough rule is: When heated under oxygen mainly carbon based materials burn up almost completely while silicon or metal oxide based materials just melt to a slag. Everything in between could be possible.
 +
Certain combinations of elements can become dangerous when burned together as we know from the PVC dioxine problem.
  
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Since s-block metals are so electropositive they tend to toss away their shell electron or pair of shell electrons and thus tend to form ionic salts. Such a salt usually has the form:
+
==== Chlorine ====
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* positively charged s-block-metal + negatively charged nonmetal-acid
+
−
Polar salts of this form are easily dissolved in water since water is a polar solvent.
+
−
But good water solubility is not what one usually wants from a typical building material - especially not if the solvent is toxic like it is the case with many beryllium compounds.
+
−
So the focus here will be on the few non or barely water soluble compounds.
+
  
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Probably the simplest barely soluble earth alkali compounds are:
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Chlorine could be drawn from common salt leaving behind sodium.
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* calcium fluorite CaF2 (fluorite)
+
To get this residual into a nonreactive environmentally acceptable form that could be used as structural material rather than just constituting waste one could chose from [//en.wikipedia.org/wiki/Category:Sodium_minerals sodium minerals].
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* magnesium oxide MgO (magnesia ... periclase)
+
To prefer are compounds with no crystal water and simple formulas with only elements of high importance for APM (that is which we are likely to gain control of soon after reaching [[technology level III]]) like e.g. [//en.wikipedia.org/wiki/Jadeite jadeite] and further ones '''to find'''.
−
 
+
−
Beryllium compounds:
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−
* chrysoberyl BeAl2O4
+
−
* beryl Be3Al2(SiO3)6 (varieties: aquamarine & emerald - cyclosilicate)
+
−
* phenakite Be2SiO4 (neosilicate)
+
−
* Bertrandite Be4Si2O7(OH)2 (hydorxide - pretty hard - sorosilicate)
+
−
 
+
−
When systematically building combinations of s-block metals and d-block nonmetal acids one
+
−
can find some barely soluble compounds:
+
−
* calcium carbonate CaCO3 (limestone/chalk ... calcite/aragonite/vaterite)
+
−
* calcium phosphates (similar to hydroxyapatit bone tooth-enamel)
+
−
* calcium silicate CaSiO3 (dry wall plates ... wollastonite)
+
−
* magnesium silicate Mg2SiO4 (forsterite - no crystal water - pretty hard - neosilicate - earth mantle mineral)
+
−
* magnesium silicate Mg3Si4O10(OH)2 (talc - a hydroxide - way too soft for a building material)
+
−
 
+
−
Some harder silicate compounds containing aluminum too are:
+
−
* jadeite NaAl[Si2O6] (a chain/band silicate)
+
−
* pyrope  Mg3Al2(SiO4)3 (a pyralspite garnet and neosilicate)
+
−
* grossularite (an ugrandite garnet ) Ca3Al2(SiO4)3
+
−
 
+
−
The hard ugrandite garnest are defined by their calcium content:
+
−
* grossularite Ca3Al2(SiO4)3
+
−
* andradite Ca3Fe2(SiO4)3
+
−
* uwarovite Ca3Cr2(SiO4)3 (contains rare chromium)
+
−
 
+
−
[''todo:'']
+
−
*[find some insoluble alkali compounds Li Na K]
+
−
*[maybe find some compounds of the heavier and less abundant ones (Rb & Cs) (Sr & Ba)]
+
−
*[treat aluminum as special case]
+
  
−
== The 13th group ==
+
== The boron group (13th group) ==
  
 
Elements of the 13th group (the [//en.wikipedia.org/wiki/Boron_group boron group]) are special in that they can form
 
Elements of the 13th group (the [//en.wikipedia.org/wiki/Boron_group boron group]) are special in that they can form
Line 186: Line 231:
 
for DME [[design levels| design]] for now.
 
for DME [[design levels| design]] for now.
  
−
In high quanities both solvated aluminum and boron compounds are alien to human and natural biology.
+
In high quantities both solvated aluminum and boron compounds are alien to human and natural biology.
 
Intake can lead to bad or unknown effects. Thus one might refrain from using strongly water soluble compounds of 13th group elements.
 
Intake can lead to bad or unknown effects. Thus one might refrain from using strongly water soluble compounds of 13th group elements.
 
Some information can be found here:
 
Some information can be found here:
Line 193: Line 238:
  
 
In [[tooltip chemistry]] boron and aluminum may be useful as tool-tips for the handling of atoms with almost full electron shells like oxygen fluorine sulfur and chlorine effectively increasing their normally low bond number. (To verify!)
 
In [[tooltip chemistry]] boron and aluminum may be useful as tool-tips for the handling of atoms with almost full electron shells like oxygen fluorine sulfur and chlorine effectively increasing their normally low bond number. (To verify!)
 +
 +
== Possible alternatives names ==
 +
 +
* gemstone like, gem-like, gemstoneoid, gemoid – ([[diamondoid]] is more specific and usually does not include gemstones like sapphire or quartz)
 +
* compound, material, substance
 +
 +
= Related =
 +
 +
* [[Mechanosynthesis]]
 +
* [[Surface passivation]]
 +
* [[Surface reconstruction]]
 +
* [[The defining traits of gem-gum-tec]]
 +
* '''[[Pure metals and metal alloys]] & why these are not used'''
 +
* [[Gemstone]]
 +
----
 +
* [[Organic anorganic gemstone interface]] – (from [[Diamond like compounds]] [[Organic gemstone-like compound]]s to [[Classical gemstone-like compound]]s)
 +
* [[Gem-gum to natural material gap]] – Technowood ...
 +
 +
= Subclassifications =
 +
 +
* '''[[Base materials with high potential]]'''
 +
* [[Biominerals]]
 +
* [[Salts of oxoacids]]
 +
* [[Transition metal monoxides]]
 +
* Find diamondoid compounds by [[Chemical element|the elements they contain]].
 +
 +
== Subclassification by contained classes of elements ==
 +
 +
* [[Classical gemstone-like compound]]s – contain metals, usually oxides, sulfides, or [[salts of oxoacids]]
 +
* [[Metal-organic gemstone-like compound]]s – contain both metals and carbon
 +
 +
[[Metal free gemstone-like compound]]s covering:
 +
* [[Organic gemstone-like compound]]s and
 +
* [[Odd gemstone-like compound]]s
 +
 +
[[Inorganic gemstone-like compound]] covering:
 +
* [[Classical gemstone-like compound]]s 
 +
* [[Odd gemstone-like compound]]s
 +
* [[Carbonitrometallo gemstone-like compounds]]
 +
 +
[[Carbonitrometallo gemstone-like compounds]] covering:
 +
* [[Simple metal containing carbides and nitrides]] (These often are [[refractory compound]]s)
 +
* '''[[Organometallic gemstone-like compound]]s''' (largely unexplored)
 +
* Carbonates (See: [[Salts of oxoacids]])
 +
* (Nitrates are usually to soft and water soluble to be mechanically useful)
 +
 +
{{Wikitodo|Make a Venn diagram – this is becoming confusing}}
 +
 +
== Subclassification by structure ==
 +
 +
* '''[[Diamond like compounds]]''' – "diamondoid" in the narrower sense of "diamond like structure"
 +
* '''[[Simple crystal structures of especial interest]]'''
 +
* '''[[Low level gemstone metamaterials]]''' and [[Neo-polymorph]]s
 +
* [[Semi diamondoid structure]]s
 +
 +
== Related ==
 +
 +
* [[The defining traits of gem-gum-tec]]
 +
* [[Gem-gum technology]]
 +
* [[Gemstone based metamaterial]]
 +
----
 +
* [[Highly polycyclic small molecule]]
 +
* [[Stiffness]]
 +
 +
= External links =
 +
 +
* '''[[Good websites about compounds and minerals]]'''
 +
----
 +
* Wikipedia has its own page about diamondoid materials. See here: [https://en.wikipedia.org/wiki/Diamondoid]
 +
* Wikipedia: [//en.wikipedia.org/wiki/Allotrope Allotrope]
 +
 +
= Table of Contents =
 +
 +
__TOC__
  
 
= Todo =
 
= Todo =
  
 
* add some beautiful images of minerals in their gem grade form
 
* add some beautiful images of minerals in their gem grade form
−
* [[pseuso phase diagrams]]
+
* [[pseudo phase diagram]]s
 +
* add nanosystems definition of "diamondoid"
  
  
 
[[Category: Technology level III]]
 
[[Category: Technology level III]]
 
[[Category: Technology level II]]
 
[[Category: Technology level II]]

Latest revision as of 10:31, 13 December 2023

In the future we will build with gemstones.
Depicted is moissanite which is gemstone grade silicon carbide (SiC) – a typical gemstone-like material – without impurities it would be colorless and transparent - the silicon makes this material fireproof in bulk blocks – unlike diamond which can burn – (but also inhibits the possibility to intentionally burn it up) – heating it to extreme temperatures it just turns into glassy slag – See: Diamondoid waste incineration and Recycling.

Definition – What is a gemstone like compound?

Gemstone like materials encompass all materials that ...

  • ... have their atoms not moving around on their surfaces at room temperature but have them stay where they are for decades to eons. (they do not diffuse)
  • ... are stiff enough to keep their shape under thermal movement at room temperature (this excludes all of today's plastic polymers)
  • ... have dense three dimensional networks of covalent bonds like gemstones - (short bond loops prevent rotations around single bonds)

These properties are polar opposition to pure metals and metal alloys.
Follow the link to see the reverse perspective explaining why they are not well suited for gem based APM.

Use – What are gemstone like compound good for?

Gemstone like materials ...

Introduction

Why the focus on gemstone like compounds

Gemstone-like (or more narrow diamondoid) compounds are the material of choice for:

Crystolecule and their assemblies (microcomponents) and
all forms and fashions of assemblies of both of them into gemstone based metamaterials are
what is the essence of the products of advanced future gem-gum technology.)

Lower error rates in assembly & Products not decaying away just from room temperature heat

The main reason for why gemstone like compounds are the material of choice here is that at room temperature their atoms do not jitter and wobble around too strongly or even diffuse away. This is important

For the assembly process more specifically one needs to choose a gemstone like compound that is sufficiently stiff such that a manipulator made out of this compound can keep the amplitudes of the thermal vibrations that occur at the manipulators tip sufficiently smaller than the lattice spacing of the work-piece that is made out of the same (or an other) gemstone like compound. This way placement errors can be suppressed. That is: errors can be made very very rare, like bit errors in digital computing. (Related: Lattice scaled stiffness)

Low error rates are also important in light of that in final production devices the assembly process is for the most part a a blind process that can't see or correct its own errors.

Rigid bodies are easier to work with than floppy jiggly folding fluff

Products out of gemstone like (diamondoid) materials can be made so that they only have one to a few tightly controlled degrees of freedom (axles rails). This is unlike soft nanoscale machinery like in biology wher pushing in on one side all sort of predictable to massively unpredictable things can and often will happen.

With only a few clearly defined independent degrees of freedoms for motions one can more easily test one action at a time (Related: Microcomponent maintenance units). This is a fundamental engineering principle that allows for faster progress. In contrast a systems design that poses the necessity for scientific entangling of convoluted relationships is usually considered bad. Natural nanosystems (e.g. like e.g. the case in soft natural proteins with barely predictable folding and behavior as present in living cells) are like this. Likely because of random incremental evolution in small steps without any far look-ahead that only higher thought would enable. In this regard one obviously shouldn't copy from nature.

Stability against water and other chemicals

Gemstone like compounds that are intended to be used on the surface of products have additional requirements on chemical stability. First and foremost in most cases one wouldn't want them to be water soluble. But resilience against stronger acids bases and oxidizers may be desired too. This drastically restricts the range of usable compounds when it comes to the surfaces of products.

The majority of the material a product is made out of lives well isolated on the inside of the bulk product. Thus for most of the products total volume (all the inner volume) the wider less chemically stable range of material is open for usage.

Adding protective hulls and compartmentalization as a workaround

It's a bit like the protective skin of fruits. The outer skin must be made out of a much more chemically stable material than the delicate inside and once the inside is exposed it may quickly decay. (Related: Passivation, Surface passivation, Biological analogies) Unlike in fruits though gemstone based metamaterial can be made designed to be micro-compartmentalized. That is: Each and every microcomponent may have a hull out of a few chemically highly stable gemstone like compounds and an interior with a greater range of much less chemically stable gemstone like compounds. A good design could make breaking up some microcomponents by macroscopic impact nigh impossible. Well, excluding hyper-velocity impacts here, like those one would expect when space debris impacts into spacecraft hull.

How material solubility and environmental friendlyness relate

Extensive usage of water dissolvable materials out of non toxic elements may even help biodegradability. Products should though be designed in a way that non-water-dissolvable nanoscale parts can't come loose individually (or sparsely and fragilely connected). A worst case scenario would be that due to bad designs huge quantities of water (and acid) undissolvable nanoscale parts come loose spill into the environment accumulate there and eventually cause lots of harm to animal and human life.

Difference to normal gemstones and relation to metamaterials

By mechanosynthesizing gemstone like materials one can go far beyond the known polymorphs (or allotropes).

  • "Polymorphs" are various crystal structures of one and the same chemical formula. – Example: rutile and anatase are both TiO2)
  • "Allotropes" are are the polymorphs of compounds made from one single element compounds. – Example: diamond and lonsdaleite are both pure carbon (C)

One can go far beyond all the phases that are reachable by conventional thermodynamic means of material production (means that all lack atomically precise control). The newly accessible phases of the same old mundane chemical formulas include ones that are thermodynamically unstable nonetheless strongly metastable. A peculiarly interesting case may be stishovite. Here a material with the well known formula SiO2 (which usually points to our good old friend quartz) suddenly makes an enormously hard and dense material.

For more info about emulating some exotic material properties by complex atomic substitutions in gemstone like compounds
see main article: Low level gemstone metamaterials and page: Neo-polymorphs

Carbons versatility

By the time of last review (2017) carbon is the only building material for which extensive studies about tooltip chemistry have been undertaken.

Carbon (especially in the form of diamond) has been chosen because it constitutes a particularly difficult far term test case for exploratory engineering. It has not been chosen as an easy to reach near term objective to target directly.

By structuring just carbon alone, with just a bit hydrogen as passivation agent (no further elements), to mechanical metamaterials many material properties will be achievable.

Beyond carbon from acetylene and methane many further studies are needed most importantly:

  • machanosynthetic splitting of water for scavenging usable oxygen
  • direct splitting of oxygen
  • splitting of nitrogen - artificial and different to current natural or industrial methods of nitrogen fixation.
  • splitting of carbon dioxide
  • fluorine and the nonmetal elements of the third period

Carbon nanotubes can replace the scarce element copper for electrical cables.

gemstone-like vs diamondoid

Instead of "gemstone like compound" the term "diamondoid compound" can be used.

This may have a more restrictive meaning limiting focus towards compounds that are easy to passivate and thus more suitable for machine elements with sliding interfaces. This primarty entails the exclusion of salts (like e.g. Periclase MgO) and secondary the exclusion of big class of metal oxides, sulfides, nitrides and related compounds (e.g. Sapphire, Pyrite, titanium nitride (Osbornite), ...)

Related: The too strong exclusive focus on diamond only. See: "Pathway controversy".

Gemstone like compounds

Please keep in mind that all compounds we know of today are only those few we can create by mixing and cooking various elements or preproduced compounds together. With mechanosynthesis many more will be accessible. Although they're not in a thermodynamic minimum they'll be very stable at room temperature. A recent example is the theoretical prediction of the stability of graphitic pentagonal carbon sheets with the so called cairo pattern. The "few" compounds we can create by mixing and cooking them together are all the minerals that are documented today. These will be surveyed here. Many more meta-stable compounds will become mechanosynthesizable though for most applications the allotropes of carbon used in their high level metamaterial configurations alone will suffice.

Taking the rock forming mineral quartz one finds several natural polymorphs. The "quartz group".
Beyond those natural polymorphs Neo-polymorphs of SiO2 will be accessible via mechanosynthesis
which are (albeit their deviation from thermodynamic equilibrium) very stable but not accessible today.

See main article: Polymorphs of silicon dioxide and pseudo phase diagrams

Lists of potential structural compounds

For especially interesting ones check out: "Charts for gemstone-like compounds"

early materials

pure elements

  • C carbon sp3 network allotropes: diamond, lonsdaleite; sp2 allotropes: fullerenes, graphitic networks
  • Si silicon (also cubic or hexagonal)
  • B ~four allotropes of elementar boron (may be difficult to use)
  • P & S allotropes of phosphorus and sulfur (may be difficult to use because of what follows below)

some classifications: (a high dimensional overlapping space of possibilities)

Issues with more complex compounds

Metamaterials made from the basic gemstone-like materials are able to emulate a lot of physical properties.
Further binary ternary or higher gemstone-like materials can complicate engineering design due to:

  • low symmetry in their crystal structure - See: Isotropy of materials
  • porousness due to bridge bonding like present in all salts of oxoacids X-O-X (X can be e.g. Si,Al,P,...) and some other compounds
  • complex or polar surface structure which may be difficult to passivate
  • lack of tensile strength
  • ...

thus they may predominantly find use for special applications like as:

  • slowly water dissolvable materials for better biodegradability
  • laser gain materials
  • infill materials
  • materials with special electrical magnetical or other exotic non high level emulatable properties
  • ...

In the following classifications section you'll find a lot of links to wikipedia articles about gem-grade minerals with very beautiful pictures. Please note that the colors you see are in most of the cases due to small impurities and not inherent to the minerals themselves. Most (electrically non conductive) minerals will be completely transparent when built defect and impurity free. An extreme example is silicon carbide known as a black solid but in single crystalline form it's called mossianite and completely transparent. Color should be intentionally addable by mechanosynthetic sparse checkerboard dotation.

compounds which contain relatively scarce elements

Those may be useful in the lower technology levels or special tooltip chemistry where only very small amounts are needed (e.g. germaium containing tips).

  • molybdenium oxide structures
  • germanium compounds
  • ... many more

Sources for elements

Carbon is planned to be drawn from [ethyne] more commonly known as the welding gas acetylene. It has the advantage of a triple bond that when partly split up provides four unpassivated bonds and it's carrying around a minimal amount of hydrogen. Since DMEs are compact and crystal like they have a lot less surface than the source molecules and thus require a lot less hydrogen passivation. Ethyne cant be delivered in highly compressed gaseous form since it explosively decomposes. It is hardly soluble in water but well soluble in acetone ethanol or dimethylformamide. Ethyne can be manufactured by the partial combustion of methane and thus potentially be gained from renewable resources.

If one looks at the most common or most easily accessible elements and their simplest compounds one finds a list of potential structural building materials:
Link to a graphic of the most common elements in the earths crust from Wikimedia Commons.

Most easily accessible are nitrogen oxygen and argon since they can directly be drawn from the atmosphere.
To investigate:

  • Means for filtering/capturing N2 and O2 each selectively from the atmosphere.
  • Mechanosynthetic tooltips and manipulations to gain reactive moieties out captured N2 and O2.

drawn from the atmosphere

Oxygen and nitrogen rich compounds like SiO2 and Si3N4 are interesting because more than half of this material can be drawn directly from the atmosphere. When atmospheric carbon dioxide is used carbon allotropes and β-C3N4 can be drawn 100% from the air.

back to the atmosphere

When burning diamondoid materials (hopefully in a smart way - thus only in traces - see recycling) it strongly depends on the type of chosen material whether they convert to gasses or just reform to a glassy slag. In the latter case it will be more difficult to recover the elements in pure form. The rough rule is: When heated under oxygen mainly carbon based materials burn up almost completely while silicon or metal oxide based materials just melt to a slag. Everything in between could be possible. Certain combinations of elements can become dangerous when burned together as we know from the PVC dioxine problem.

Chlorine

Chlorine could be drawn from common salt leaving behind sodium. To get this residual into a nonreactive environmentally acceptable form that could be used as structural material rather than just constituting waste one could chose from sodium minerals. To prefer are compounds with no crystal water and simple formulas with only elements of high importance for APM (that is which we are likely to gain control of soon after reaching technology level III) like e.g. jadeite and further ones to find.

The boron group (13th group)

Elements of the 13th group (the boron group) are special in that they can form electron deficiency bonds.

If elements of this group come into play (are used in DMEs) the view of atoms as construction blocks with a fixed number of connection points breaks down. E.g. when boron comes in contact with nitrogen the lone pair of nitrogen plucks into the electron deficient hull of boron making the two atoms more behave like two four valenced carbon atoms (with a little polar/ionic character). Prime example: ammonia borane. This is not yet handeled correctly by the software Nanoengineer-1 so it is advised to refrain from using 13th group elements for DME design for now.

In high quantities both solvated aluminum and boron compounds are alien to human and natural biology. Intake can lead to bad or unknown effects. Thus one might refrain from using strongly water soluble compounds of 13th group elements. Some information can be found here: boron and water (de); aluminum and water (de)

In tooltip chemistry boron and aluminum may be useful as tool-tips for the handling of atoms with almost full electron shells like oxygen fluorine sulfur and chlorine effectively increasing their normally low bond number. (To verify!)

Possible alternatives names

  • gemstone like, gem-like, gemstoneoid, gemoid – (diamondoid is more specific and usually does not include gemstones like sapphire or quartz)
  • compound, material, substance

Related

Subclassifications

Subclassification by contained classes of elements

Metal free gemstone-like compounds covering:

Inorganic gemstone-like compound covering:

Carbonitrometallo gemstone-like compounds covering:

(wiki-TODO: Make a Venn diagram – this is becoming confusing)

Subclassification by structure

Related

External links

  • Wikipedia has its own page about diamondoid materials. See here: [1]
  • Wikipedia: Allotrope

Table of Contents

Todo

  • add some beautiful images of minerals in their gem grade form
  • pseudo phase diagrams
  • add nanosystems definition of "diamondoid"
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