Difference between revisions of "Gemstone-like molecular element"

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'''Given their nanoscale gemstone like nature unfortunately crystolecules and their assemblies [[crystollecular element|crystollecular (machine) elements]] cannot be produced yet (state 2015..2021).'''
 
'''Given their nanoscale gemstone like nature unfortunately crystolecules and their assemblies [[crystollecular element|crystollecular (machine) elements]] cannot be produced yet (state 2015..2021).'''
  
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'''Here are some [[examples of diamondoid molecular machine elements]].'''
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A subclass of [[gemstone-like compounds]] are [[diamond like compounds]]. (For a disambiguation see: [[Diamondoid]]) <br>
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Accordingly a subclass of [[gemstone-like molecular element]]s are [[diamondoid molecular element]]s.
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A subclass of [[gemstone-like compounds]] are [[diamond like compounds]]. (For a disambiguation see: [[Diamondoid]])
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* '''[[Diamondoid molecular machine element]]s''' (DMMEs) are assemblies of some diamondoid crystolecules implementing one specific mechanical function
 
* '''[[Diamondoid molecular machine element]]s''' (DMMEs) are assemblies of some diamondoid crystolecules implementing one specific mechanical function
 
* '''Diamondoid molecular structural elements''' (DMSEs) are crystolecules or assemblies of some diamondoid crystolecules implementing a structural function
 
* '''Diamondoid molecular structural elements''' (DMSEs) are crystolecules or assemblies of some diamondoid crystolecules implementing a structural function
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something sensible must be invented to refer to them in this wiki.  
 
something sensible must be invented to refer to them in this wiki.  
  
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== "Crystolecules" – Term introduction and definition ==
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= "Crystolecules" – Term introduction and definition =
  
 
These objects are somewhat of a cross between a crystal and a molecule. <br>
 
These objects are somewhat of a cross between a crystal and a molecule. <br>
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* are assembled purely at the first assembly level by [[piezochemical mechanosynthesis]] (direct [[in place assembly]])
 
* are assembled purely at the first assembly level by [[piezochemical mechanosynthesis]] (direct [[in place assembly]])
  
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== Diamondoid molecular (structural and machine) elements – Term introduction and  definition ==
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= "Crystolecular elements" =
 +
 
 +
See main page: [[Crystolecular element]]
 +
 
 +
These are bigger assemblies of basic structural crystolecules. <br>
 +
Assembled from crystolecules either via [[seamless covalent welding]] or [[Van der Waals force sticking]] and/or [[shape closing interlocking]]
  
 
Let's use a different name for crystolecules or assemblies of crystolecules that are typically:
 
Let's use a different name for crystolecules or assemblies of crystolecules that are typically:
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* do feature irreversibly enclosed moving parts
 
* do feature irreversibly enclosed moving parts
 
* may involve pick and place post assembly (from constituent crystolecules) at the next higher assembly level
 
* may involve pick and place post assembly (from constituent crystolecules) at the next higher assembly level
 +
 +
Generally crystolecules and [[crystolecular elements]] will be made from [[gemstone like compound]]s. <br>
 +
One subclass already investigated a bit in molecular detail are the [[crystolecular elements]] made from [[diamondoid like compound]].
 +
Specifically some ones made from [[diamond]] and [[moissanite]] where investigated.
 +
See: '''[[Examples of diamondoid molecular machine elements]].'''
 +
 +
== Diamondoid molecular (structural and machine) elements – Term introduction and  definition ==
  
 
Let's use:
 
Let's use:
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Crystolecules must not be confused with crystals out of folded up polypeptide molecules aka proteins (that are made today to find the locations of their constituent atoms). To emphasize the distinction one could use the term "covalent crystolecules".
 
Crystolecules must not be confused with crystals out of folded up polypeptide molecules aka proteins (that are made today to find the locations of their constituent atoms). To emphasize the distinction one could use the term "covalent crystolecules".
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= Machine elements (DMMEs) =
 
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== Types ==
 
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=== Bearings  ===
 
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DMME bearings exhibit [[superlubrication|superlubrication]]. In the case of [[diamondoid]] rotative bearings this looks like described here: [http://e-drexler.com/p/04/02/0315bearingSums.html E.Drexler's blog: Symmetric molecular bearings can exhibit low energy barriers that are insensitive to details of the potential energy function].
 
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The occurring friction is orders of magnitude lower than the one occurring when liquid lubricants are used in macro or microscopic (non [[atomic precision|AP]]) bearings [http://e-drexler.com/p/04/03/0322drags.html E.Drexler's blog: Phonon drag in sleeve bearings can be orders of magnitude smaller than viscous drag in liquids].
 
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DMME bearings can be built such that the force between bearing and axle is anti-compressive further lowering dynamic drag but also lowering stiffness possibly down to zero. [http://e-drexler.com/p/04/03/0322nonrepulsive.html E.Drexler's blog: Bearings can be stable despite attractive interactions between their surfaces] (related: [[levitation]])
 
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If badly chosen the combined symmetry of bearing and axle can create a bistable tristable or an other low symmetry configuration. This should usually be avoided. Some symmetry considerations can be found here: [http://www.zyvex.com/nanotech/bearingProof.html Zyvex; Ralph C. Merkle: A Proof About Molecular Bearings] and iirc on the Nanoengineer-1 developer wiki which went missing. :(
 
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A tutorial on bearing design can be found here: [http://www.somewhereville.com/?p=82 A Low-Friction Molecular Bearing Assembly Tutorial, v1]
 
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=== Friction elements ===
 
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Interlocking teeth with low stiffness can snap back and thermalize energy.
 
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[http://e-drexler.com/p/04/02/0315pairSnap.html E.Drexler's blog: Softly supported sliding atoms can undergo abrupt transitions in energy]
 
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This can serve as a break (analog to an electrical resistor in an electrical circuit)
 
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One very interesting machine element design is the '''warp spring clutch'''. [http://www.tinyclutch.com/spring-clutches.htm]
 
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[https://www.google.com/search?q=warp+spring+clutch&oq=warp+spring+clutch google]
 
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=== Gears ===
 
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Single rows of protruding atoms can be used as gear teeth.
 
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But a simple pair of inter-meshing straight bevel-gears has a lot higher bumpiness than well designed DMME bearings.
 
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This can be reduced by making the gears very slightly helical (e.g. through applied strain) so that simultaneous contacts have phase shifts thoroughly below the angle of a tooth. Such bump-smoothing-gears have not been designed and analyzed yet (2014) ['''Todo''': example design]. Meshing pairs of unequal designed gears may help too.
 
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Making the teeth bigger by using more but not much more than one atom row for a gear gives a lot of undisired "bumpiness".
 
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Quite a bit bigger gears could use involute teeth like their macroscopic cousins.
 
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Involute teeth can be approximated by strained and or dislocation including diamondoid structures.
 
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Surface structure is best kept non-aligning. Friction prone [[passivation]]s like a standard hydrogen passivation should be avoided. Graphite linings might be usable. It remains to be analyzed whether and if which advantages approximations of involute and other gear profiles provide. The effects on transmittable torque, axial pressure and so on are of interest.
 
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Considerations about stiffness as in [[superlubrication]] for DMME bearings are equally relevant for grears [''more details needed''].
 
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=== Fasteners  ===
 
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Details can be found on the [[locking mechanisms]] page. <br>
 
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Enclosed radicals could be used to make very compact reversible connectors (name suggestion: ''covaconns'' - for covalent connectors)
 
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* [''Todo:'' note details about the expanding ridge joint]
 
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=== Pumps ===
 
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There is a model of a single atom neon pump which to some degree acts as a filter too.
 
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Positive displacement pumps like piston pumps scroll pumps or progressing cavity pumps have not yet been designed.
 
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=== Others  ===
 
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* Parts for the management of [[semi diamondoid structure]]s - e.g. coil barrels - those are especially amenable for testing.
 
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* [Todo: telescoptc rods; joints; hinges .... ball joints -> issues lack of ball curvature?]
 
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== Sets ==
 
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To be able to build the maximal amount of different [[microcomponents]] with the minimal amount of DMEs one needs to design/pick optimal sets of DMEs from a very large design space.
 
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=== Minimal set of compatible DMMEs  ===
 
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In electric circuits there is one topological and three kinds of basic passive elements.<br>
 
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Adding an active switching element one can create a great class of circuits. <br>
 
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'''0) fork node; 1) capacitors; 2) inductors; 3) resistors'''
 
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Those passive elements have a direct correspondences in rotative or reciprocating mechanics namely: <br>
 
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'''0) planetary or differential gearbox [*]; 1) springs; 2) inertial masses; 3) friction elements''' <br>
 
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[*] and analogons for reciprocating mechanics (see: [[Nanomechanic circuits]])
 
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But there are limits to the electric-mechanic analogy. Some mechanic elements often differ significantly from their electric counterparts in their qualitative behavior.
 
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Two examples of elements  quite different in behaviour are:
 
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* transistors & locking pins
 
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* transformers & gearboxes
 
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With creating a set of standard sizes of those elements and a modular building block system to put them together
 
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creating rather complex systems can be done in a much shorter time. <br>
 
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Like in electronics one can first create a schematics and subsequently the board.
 
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'''To do:''' Create a minimal set of minimal sized DMMEs for rotative nanomechanics.
 
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Modular housing structures standard bearings and standard axle redirectioning are also needed.
 
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'''To investigate:''' how can reciprocating mechanics be implemented considering the [[passivation bending issue]]
 
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= Structural elements (DMSEs) =
 
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[[File:Wiki-tetrapod-openconnects-black-135.png|frame| An example of a diamondoid molecular structural element (DMSE). The bright red spots are open bonds.]]
 
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There's the ''shape-lock-chain-core-reinforcement'' principle. For details see: [[Structural elements for nanofactories]]
 
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== DME Adapters ==
 
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It makes sense to have for each standard DME no matter of which type an adapter to a "the" standard couplings on the transportation chains.
 
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Since adapters will be reusable for many cycles the necessary production capacity for part-A-adapters will be much smaller than the targeted production capacity for part-A-DMEs. Building (mechanosynthesizing) the adapters right on the transportation chain couplings avoids the necessity of adapters for adapters.
 
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Connections at this level will mostly be sparse covalent reversible and for a bit bigger parts Van der Waals and shape locking.
 
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== Sets ==
 
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* standardised building block systems
 
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* housing structures
 
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* standard corner pieces connecting the various crystallographic planes
 
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* in edge passivation with hydrogen can be problematic
 
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* issue of non androgynous [[surface interfaces|sinterfaces]]
 
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* brackets for sub bond length positioning [[http://www.foresight.org/Updates/Update10/Update10.3.html]]
 
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* standard pipe and channel segments - the [[passivation bending issue]] is of relevance
 
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= Molecular transport elements =
 
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Elements that create one dimensional structures for the logistic transport of different media are a bit of a
 
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cross between machine elements and structural elements.
 
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== data transmission ==
 
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For transmission of data in Nanosystems [//en.wikipedia.org/wiki/Polyyne polyyine] rods where proposed.
 
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They constitute the thinnest physically possible rod manufacturable and consist out of sp hybridized carbon which must be [[mechanosynthesis|mechanosynthesizable]] for their construction which goes beyond minimal necessary capabilities (sure?).
 
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Handling of sp carbon is involved in already analyzed [[tooltip chemistry]] though and thus likely to be available.
 
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Polyyne rods obviously are rather susceptible to [[radiation damage]] thus it might be wise to use chains of benzene rings which are more stable.
 
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With the first few additional ring widths the event of non self healing catastrophic damage becomes drastically more unlikely per unit of time. ['''Todo''': calculate estimations]
 
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Still two of those ribbons like to fuse under UV irradiation (see: [//en.wikipedia.org/wiki/Anthracene anthracene])
 
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Going to cyclohexan chains and bigger diamondoid rods makes the surface a lot more bumpy and the housings a lot more bulky.
 
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* parity bits and more elaborate (somewhat holographic) data redundancy
 
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* bit flip - tape rupture
 
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== energy transmission ==
 
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For power transmission strained shell near cylindrical diamondoid axles are a good possibility reciprocative movement may be better for high power densities.
 
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== Heat transport ==
 
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For thermal drain water works well because of its very high heat capacity. To drastically reduce friction one should pass it around enclosed in diamond pellets ([[capsule transport]]) to get it in either one needs to use very high pressure (sealing might be difficult; thermal conductance may suffer) or the insides are made hydrophobic by adding -OH instead of -H surface terminations. In the latter case mechanosynthetic oxygen placement capabilities are needed which go beyond minimal necessary capabilities. Pipes are easily creatable but work better at the macroscale.
 
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It may be possible to use the phase transition ice water to keep the factory at constant temperature but note that super-clean water (that occurs as waste see below) does not necessarily freeze when super-cooled and the melting point might be significantly altered in small possibly hydrophobic encapsulation.
 
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== raw material supply ==
 
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For supply of solvated raw material the same method as for the cooling solvent can be used.
 
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== waste removal ==
 
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A waste that always occurs at a low rate comes from oxidation of excess hydrogen - atomically clean water.
 
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Water can be drained via pipes or enclosed in pellets [more investigation of existing literature needed]
 
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Beside that depending on how much self repair capability is included
 
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waste can be constituted out of shunned microcomponents because they are irreparable or likely to be broken or dirt contaminated.
 
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(see: "[[microcomponent tagging]]") or out of dysfunctional DMEs caused by assembly errors. ...
 
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= General properties of DMEs =
 
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To get a better picture how DMEs behave mechanically
 
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and in general how everything else behaves at this size range
 
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one can '''look at the [[scaling laws]]''' which describe how physical quantities scale with size.
 
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DMEs with carbon, silicon carbide or silicon as core material can have internal structure like
 
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* diamond / [//en.wikipedia.org/wiki/Lonsdaleite lonsdaleite]
 
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* or other possibly strained [//en.wikipedia.org/wiki/Sp3_bond#sp3_hybrids sp<sup>3</sup>] configurations.
 
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Due to the lack of defects the [//en.wikipedia.org/wiki/Ultimate_tensile_strength ultimate tensile strength] of larger DMEs lies above diamond of thermodynamic origin.
 
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== Strained shell structures ==
 
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To form cylindrical or helical structures with high to maximal rotational symmetries for their size (good axles for [[superlubrication]]) one usually constructs wedge shaped segments and put them together until they naturally turn around 360 degree. Bending can be induced from internal structure or surface passivation (since passivation atoms haven't got the exact same bond length like the internal atoms, see: [[passivation bending issue]]).
 
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If 360° are exactly met the structures bending results from internal unstrained structure the whole structure is unstrained - a goal to aim for. If not bending to a strained shell is required.
 
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For thin tubes of high diameter a completely unstrained lattice of the used diamondoid material can be bent around.
 
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A note on bending tools can be found on the "[[mechanosynthesis]]" page.
 
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Spheres are rather hard to approximate. [to investigate: feasability of ball joints]
 
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When the gap between axle and sleeves is made bigger then interestingly it is possible to achieve negative pressures. <br>
 
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See: [[Negative pressure bearings]].
 
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== VdW sticking ==
 
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See: [[locking mechanisms]] <br>
 
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[Todo: add calculation of how much surface is needed to securely overcome the characteristic thermal energy  (100kT?) -- to locking mechanisms?? -- techlevel I related too ...] <br>
 
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[Todo: link to force estimation]
 
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== Acceleration tolerance ==
 
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[Todo: add calculation of a block on a neck model - for "intuitive" understanding]
 
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When halving size mass shrinks eightfold ([[scaling laws]]) this leads to ...
 
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high tolerance to accelerations (and possibly slow building speeds) may seduce one to build very filigree structures.
 
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Especially nanofactories will have lots of vacuum filled free space inside.
 
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Since the structures still can be crushed by external pinching forces
 
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one should - to avoid health hazards and waste production - always design with prevention measures for [[sharp edges and splinters]] in mind.
 
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= Design of MMEs / crystolecules =
 
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To this date (2015) most of the designed crystolecules where made with the software nanoengineer-1
 
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When designing DMEs some things have to be taken care of. See: [[Design of Crystolecules]]
 
  
 
= Related =
 
= Related =

Revision as of 09:23, 9 June 2021

Here is a rather small structural crystolecule with some bonds (brighter red) intentionally left open/dangling/unpassivated (See: Nanoscale surface passivation) such that in the next assembly step several of these can be fused together via seamless covalent welding.
A proposed acetylene sorting pump. This is a larger diamondoid machine element (DMEs). The frame is one big monolithic crystolecule (it may be fused togehter via seamless covalent welding during assembly). Other parts are smaller independent crystolecules that may be mechanosynthesized fully passivated as a whole and integrated as a whole without any seamless welding.

Gemstone-like molecular elements (GMEs) here also called crystolecules are parts of machine elements and structural elements at the lowermost physical size limit. They are produced via piezochemical mechanosynthesis and are often highly symmetrical. Gemstone-like molecular elements are the basic building blocks in gemstone metamaterial technology.

Base material

Gemstone-like compounds are the most suitable base material for crystolecules. Beside classical gemstones like diamond other semi-precious minerals including bio-minerals that are synthesizable in solution also fall under gemstone-like compounds. These may be accessible earlier in semi advanced precursor technologies.

Use of pure metals and metal alloys is rather unsuitable for crystolecules.

  • Metallic bonds with free electron gas are not directed like covalent bonds.
  • Metal atoms on metal surfaces tend to diffuse away from where they have been deposited. Especially on surfaces.

Crystolecules are:

Given their nanoscale gemstone like nature unfortunately crystolecules and their assemblies crystollecular (machine) elements cannot be produced yet (state 2015..2021).

A subclass of gemstone-like compounds are diamond like compounds. (For a disambiguation see: Diamondoid)
Accordingly a subclass of gemstone-like molecular elements are diamondoid molecular elements.

  • Diamondoid molecular machine elements (DMMEs) are assemblies of some diamondoid crystolecules implementing one specific mechanical function
  • Diamondoid molecular structural elements (DMSEs) are crystolecules or assemblies of some diamondoid crystolecules implementing a structural function

Beware of the stroboscopic illusion

well animated bearing
The fast thermal vibrations are more realistically blurred out. The remaining localized periodic average deformations (visible here if one looks closely) are highly reversible. (See page abbout "superlubrication".) 		badly animated bearing
The present stroboscopic effect can be misleading in that friction is likely to be grossly overestimated. It deceivingly looks like as if the operating speed would be close to the speed of the thermal vibration. If that where the case it indeed would cause massive friction (strong coupling of motions with similar frequency).
DMME - bearing with blurred out fast vibrations
DMME - bearing with misleading stroboscopic effect

Simulated DMEs often show a misleading stroboscopic effect which can make one believe that the operation frequencies lie near the thermal frequencies, giving the false impression of enormously high friction but actually the contrary is true.
See: "Friction in gem-gum technology" and "Superlubrication".

Gemstone like molecular machine elements with sliding interfaces will work exceptionally well. (See: Superlubricity)
There is both experimental evidence and theoretical evidence for that.
(See e.g.: Evaluating the Friction of Rotary Joints in Molecular Machines (paper) and the friction analysis in Nanosystems)

Nomenclature

Since the here described physical objects have no official name yet (2016..2021)
something sensible must be invented to refer to them in this wiki.

"Crystolecules" – Term introduction and definition

These objects are somewhat of a cross between a crystal and a molecule.
So let's use the term "crystolecule".
This is nice because it's:

  • quite accurate in descriptiveness
  • quite conveniently usable in natural language
  • quite memorably (catchy) because it seems unusual (clickbait effect)

Specificall lets use the term "crystolecule" for ones that are typically are:

"Crystolecular elements"

See main page: Crystolecular element

These are bigger assemblies of basic structural crystolecules.
Assembled from crystolecules either via seamless covalent welding or Van der Waals force sticking and/or shape closing interlocking

Let's use a different name for crystolecules or assemblies of crystolecules that are typically:

  • a bit bigger
  • also functional in nature not just structural
  • not monolithic
  • do feature irreversibly enclosed moving parts
  • may involve pick and place post assembly (from constituent crystolecules) at the next higher assembly level

Generally crystolecules and crystolecular elements will be made from gemstone like compounds.
One subclass already investigated a bit in molecular detail are the crystolecular elements made from diamondoid like compound. Specifically some ones made from diamond and moissanite where investigated. See: Examples of diamondoid molecular machine elements.

Diamondoid molecular (structural and machine) elements – Term introduction and definition

Let's use:

  • Diamondoid molecular structural elements (DMSEs) for structural ones of all sizes including beside small ones also bigger ones
  • Diamondoid molecular machine elements (DMMEs) for functional ones that are typically bigger in size
  • Diamondoid molecular elements (DMEs) for structures of all sized including both of the former
  • ("Diamondoid" can be replaced by "Gemoid" to include more general gemstone like compounds like e.g. sapphire)

Examples:

Delineation – what crystolecules must not be confused with

Crystolecules must not be confused with crystals out of folded up polypeptide molecules aka proteins (that are made today to find the locations of their constituent atoms). To emphasize the distinction one could use the term "covalent crystolecules".

Related

Terms for bigger assemblies of several crystolecules but not yet as big (and disassemblable) as microcomponents

External links

At K. Eric Drexlers website:

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