High pressure

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In advanced gem-gum technology extremely high pressures can be easily induced by simple means of mechanical advantage.

Why high pressures don't cause cracking on the nanoscale

Since most crystolecules are fully atomically precise and faultless there are no points where cracks can start early. Thus albeit being gemstones (which in our usual macroscale experience are rather brittle) they can be bent in the two digit percentual range. At the nanoscale the whole theoretical strength of the material can be exploited.

Mechanosynthesis is all about high pressure

By means of mechanical transmissions and cones pressures (and tensions) can be increased all the way to breaking point of the chemical bonds of the strongest existing materials (e.g. flawless diamond). After all this is what the process of mechanosynthesis is all about.

By conceptually widening the tips of the tool holder cones for mechanosynthesis one could break more bonds at once. A stiff diamond rod between to tips can be bent all the way to the theoretical limit (a little more if cold).

What about high pressures at the macroscale

Large conglomerates of crystolecules will of course have some crystolecules inside which have mild to severe faults. But due to the nature of their connection featuring shape locking cracks in crystolecules are stopped immediately at their interlocking interfaces. Thus even at the macroscale still a good fraction of the theoretical strength of the material can be exploited.

Applications

Applications of high pressure in the nanoscale

By keeping extremely high pressures in localized patches products containing these can be completely safe at the macroscale.

Inclusion of slight strains can help simplifying design of crystolecules - example: strained shell sleeve bearing

Pressure can have very strong effects on various physical properties. It can have a similar effect to low temperature. This gives several opportunities to reducing civilizations dependency on scarce elements.

  • Magnetism in elements that don't normally show it. (carbon)
  • Superconductivity at higher temperatures than normal (maybe even room temperature?)
    (highly compressed noble gasses in channels as wires?)
  • On the single bond level highly controlled application of extreme pressures makes noble metals for catalysis (which much more limited capabilities) obsolete. (See: Mechanosynthesis)

Applications of high pressure in the macroscale

Obviously monolithic macroscopic tanks filled with extreme pressures naturally pose a considerable risk. While pretty safe when undisturbed exposure to external force can easily lead to a violent explosion. So unless absolutely necessary one will likely want to avoid such tanks.

In cases where surface area needs to be minimized.

The limits to bending

One should keep an eye on the average stress strain energy of all the nanomachinery in a product taken together such that one does not accidentally produce combustion supporting or even explosive products.

When increasing stress and strain in crystolecules further and further one successively looses:

  • first chemical stability (ok when isolated in a vacuum as for most machinery the case)
  • then thermal stability (we are very near the limit! – ok when cooled down enough permanently)
  • and finally mechanical stability (fracture)

Actually testing the fracture of simple crystolecules in a controlled fashion should be very interesting.

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