Difference between revisions of "Periodic table of elements"
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''the ultimate construction toy'' | ''the ultimate construction toy'' | ||
| − | + | == Atoms as building blocks for engineering == | |
The great things about atoms from an engineering prespective are: | The great things about atoms from an engineering prespective are: | ||
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* metallic bonds (diamondoid stiff complex integration) | * metallic bonds (diamondoid stiff complex integration) | ||
* singlet triplet issues | * singlet triplet issues | ||
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| + | == Which elements are best to use == | ||
| + | |||
| + | Metals on their own tend to form non-directed metallic bonds making it easy for thermal vibration to slide around metal atoms on metal surfaces. The atoms wander (diffuse) away. Even if one places the atoms with atomically precision in a sufficiently cooled state once the product warms up to everyday temperatures all the atomically precise structure gets scrambled up. Also most metals on their own are likely to oxidize when they come in contact with electronegative nonmetal elements making them swelling up (e.g. oxidizing / rusting) | ||
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| + | In contrast nonmetals tend to form strong directed covalent bonds that do not diffuse at room temperature. | ||
| + | |||
| + | Out of this reason metals on their own aren't suitable for atomically precise nanosystems. | ||
| + | Specifically life does not use metals on their own and even barely at all as building blocks. The main exception is Calcium in bones and teeth. But Natrium which is always free floating solvated and just serve electric signalling purposes is not counted here (Same with iron and other transition element metals). The preference of life for nonmetals can be seen by comparing the map of the nonmetals to the map of dietary elements. {{todo|add illustration}} | ||
| + | |||
| + | In the context of semi advanced to fairly advanced artificial atomically precise nanosystems metals can be used if they are paird with electronegative nonmetals in very very roughly 1:1 ratio. Many common gemstones fall in this category best known is sapphire the oxide of aluminum. | ||
| + | |||
| + | Other criteria for the choice of element to be used are: | ||
| + | * The abundance of the element in context of the place where it's going to be used or rather it's economic accessibility. | ||
| + | * The mechanical strength compounds including this element to a great percentage can have | ||
| + | * The [[toxicity]] compounds containing this element usually have | ||
| + | * Special physical properties that the element provides that cannot be emulated by metamaterials (e.g. the very high density of osmium) | ||
| + | |||
| + | == Philosophical == | ||
| + | |||
| + | The periodic table of elements is probably out of good reason (minimal complexity?) not much bigger than it needs to be to allow the emergence of life in our universe. The minimalistic and general nature of our set of chemical elements allows us to use it like a construction toy in other more straight forward ways than life does. | ||
== Related == | == Related == | ||
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* [[superlubrication]] | * [[superlubrication]] | ||
* [[diamondoid molecular element]] | * [[diamondoid molecular element]] | ||
| + | * [https://en.wikipedia.org/wiki/Dietary_element dietary elements] strongly overlapping [https://en.wikipedia.org/wiki/Nonmetal nonmetals] | ||
| + | * A video of the diffusion of metal atoms on the surface of a nanoparticle: [https://www.youtube.com/watch?v=jjLTqZfxXyQ the sound of atoms] | ||
['''todo:''' add an image of the periodic table with highlighted elements of interest] | ['''todo:''' add an image of the periodic table with highlighted elements of interest] | ||
Revision as of 19:26, 16 June 2016
the ultimate construction toy
Contents
Atoms as building blocks for engineering
The great things about atoms from an engineering prespective are:
- atoms do not wear ever (well disregarding exotic things like proton decay)
- atoms have no tolerances - they are completely indistinguishable (same isotope)
- interatomic bonds are compliant (low stiffness) - assemblies can be bent a lot
- interatomic bonds are strong (high force) - materials can be very strong
One could say that these properties of atoms makes the periodic table like the ultimate construction toy.
The PToE as a construction kit - applicability and limitations to this interpretation
(TODO: discuss the following:)
- electron deficiency bonds
- metallic bonds (diamondoid stiff complex integration)
- singlet triplet issues
Which elements are best to use
Metals on their own tend to form non-directed metallic bonds making it easy for thermal vibration to slide around metal atoms on metal surfaces. The atoms wander (diffuse) away. Even if one places the atoms with atomically precision in a sufficiently cooled state once the product warms up to everyday temperatures all the atomically precise structure gets scrambled up. Also most metals on their own are likely to oxidize when they come in contact with electronegative nonmetal elements making them swelling up (e.g. oxidizing / rusting)
In contrast nonmetals tend to form strong directed covalent bonds that do not diffuse at room temperature.
Out of this reason metals on their own aren't suitable for atomically precise nanosystems. Specifically life does not use metals on their own and even barely at all as building blocks. The main exception is Calcium in bones and teeth. But Natrium which is always free floating solvated and just serve electric signalling purposes is not counted here (Same with iron and other transition element metals). The preference of life for nonmetals can be seen by comparing the map of the nonmetals to the map of dietary elements. (TODO: add illustration)
In the context of semi advanced to fairly advanced artificial atomically precise nanosystems metals can be used if they are paird with electronegative nonmetals in very very roughly 1:1 ratio. Many common gemstones fall in this category best known is sapphire the oxide of aluminum.
Other criteria for the choice of element to be used are:
- The abundance of the element in context of the place where it's going to be used or rather it's economic accessibility.
- The mechanical strength compounds including this element to a great percentage can have
- The toxicity compounds containing this element usually have
- Special physical properties that the element provides that cannot be emulated by metamaterials (e.g. the very high density of osmium)
Philosophical
The periodic table of elements is probably out of good reason (minimal complexity?) not much bigger than it needs to be to allow the emergence of life in our universe. The minimalistic and general nature of our set of chemical elements allows us to use it like a construction toy in other more straight forward ways than life does.
Related
- superlubrication
- diamondoid molecular element
- dietary elements strongly overlapping nonmetals
- A video of the diffusion of metal atoms on the surface of a nanoparticle: the sound of atoms
[todo: add an image of the periodic table with highlighted elements of interest]
