Intercrystolecular interactions: Difference between revisions
| (14 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
{{ | {{site specific term}} | ||
[[File:Crystolecule-vdW-questions forces-normal.png|600px|thumb|right|Relevant normal (sticking) motion energies, forces, and stiffnesses. Related to clap-snapping in [[intercrystolecular snapping modes]].]] | |||
[[File:Crystolecule-vdW-questions forces-parallel.png|600px|thumb|right|Relevant parallel (sliding) motion energies, forces, and stiffnesses. Related to slide-snapping in [[intercrystolecular snapping modes]].]] | |||
This page is about basic interaction modes between [[crystolecules]]. <br> | This page is about basic interaction modes between [[crystolecules]]. <br> | ||
| Line 6: | Line 8: | ||
This page does not cover snaps between [[crystolecules]]. <br> | This page does not cover snaps between [[crystolecules]]. <br> | ||
For snaps see page: [[Intercrystolecular snapping modes]] <br> | For snaps see page: [[Intercrystolecular snapping modes]] <br> | ||
There is also a closely related page about [[intercrystolecular forces]] that <br> | |||
focuses more on the fundamental [[nonbonded force]] <br> | |||
that are relevant in the context of [[crystolecules]]. <br> | |||
{{Todo|Some questions need better answering with simulations and eventually experiments.}} <br> | {{Todo|Some questions need better answering with simulations and eventually experiments.}} <br> | ||
| Line 12: | Line 18: | ||
Attractive [[van der Waals force]] flat on flat force along the surface normal. <br> | Attractive [[van der Waals force]] flat on flat force along the surface normal. <br> | ||
❓Q: '''What is the sticking energy per unit area?''' <br> | |||
❓Q: '''What is the maximal attractive force per unit area?''' <br> | |||
== Energy minimum (zero force) == | == Energy minimum (zero force) == | ||
| Line 35: | Line 41: | ||
This value might be of interest in some cases. <br> | This value might be of interest in some cases. <br> | ||
= Interdigitation sticking = | |||
= | |||
== Energy minimum (zero force) == | == Energy minimum (zero force) == | ||
| Line 44: | Line 49: | ||
* Stiffness: shear stiffness (zero due to symmetry?) | * Stiffness: shear stiffness (zero due to symmetry?) | ||
❓Q: '''How big are the energy barriers between commensural snap in locations?''' <br> | |||
Especially compared to kT thermal energy. <br> | Especially compared to kT thermal energy. <br> | ||
In other terms a '''contact area dependent "corrugation equivalent temperature".''' <br> | In other terms a '''contact area dependent "corrugation equivalent temperature".''' <br> | ||
| Line 54: | Line 59: | ||
* Stiffness: zero shear stiffness | * Stiffness: zero shear stiffness | ||
❓Q: '''How is the maximal shear force (and characteristic energy)''' <br> | |||
''' | '''at the critical zero shear-stiffness point.''' <br> | ||
== Stiffness maximum == | == Stiffness maximum == | ||
??? | ??? | ||
== Superlubric limits == | |||
❓Q: '''Same two questions for self suggesting superlubric cases like 1/sqrt(2) ratios and such.''' | |||
= Nonbonded forces for assembly = | = Nonbonded forces for assembly = | ||
| Line 72: | Line 81: | ||
* [[Intercrystolecular snapping modes]] | * [[Intercrystolecular snapping modes]] | ||
* [[Intercrystolecular levitation]] | * [[Intercrystolecular levitation]] | ||
---- | |||
* [[Energy, force, and stiffness]] | |||
* [[Intercrystolecular forces]], [[Nonbonded forces]], [[Nonbonded interactions]], [[Van der Waals force]] | |||
[[Category:Technology level III]] | |||
[[Category:Surprising facts]] | |||
Latest revision as of 22:32, 29 March 2026
This page is about basic interaction modes between crystolecules.
This goes beyond mere nonbonded forces and van der Waals forces
as there are effects of redirection involved too. Indirect forces. Thus a dedicated page.
This page does not cover snaps between crystolecules.
For snaps see page: Intercrystolecular snapping modes
There is also a closely related page about intercrystolecular forces that
focuses more on the fundamental nonbonded force
that are relevant in the context of crystolecules.
(TODO: Some questions need better answering with simulations and eventually experiments.)
Vand der Waals sticking
Attractive van der Waals force flat on flat force along the surface normal.
❓Q: What is the sticking energy per unit area?
❓Q: What is the maximal attractive force per unit area?
Energy minimum (zero force)
Statically stable "surface contact".
- Energy: Is minimal and can be quantified per unit area relative to energy at infinite distance.
- Force: Is zero, (otherwise it would not be the statically stable energy minimum)
- Stiffness: is a nonzero characteristic value per area.
Force maximum (zero stiffness)
Maximally attractive distance.
- Energy: Is a certain characteristic value per area.
- Force: Is maximally attractive per definition
- Stiffness: is zero as an infinitesimal change in distance does not change the force
Stiffness maximum
There is no limit to stiffness on the compressive side but
there is a maximal stiffness on the attractive side
This value might be of interest in some cases.
Interdigitation sticking
Energy minimum (zero force)
- Energy: Reference: Full energy barrier height between interdigitation and anti-interdigitating alignments
- Force: zero local shear force (as this is the statically stable minimum)
- Stiffness: shear stiffness (zero due to symmetry?)
❓Q: How big are the energy barriers between commensural snap in locations?
Especially compared to kT thermal energy.
In other terms a contact area dependent "corrugation equivalent temperature".
Force maximum (zero stiffness)
- Energy: Is a certain characteristic value per area.
- Force: maximal shear force
- Stiffness: zero shear stiffness
❓Q: How is the maximal shear force (and characteristic energy)
at the critical zero shear-stiffness point.
Stiffness maximum
???
Superlubric limits
❓Q: Same two questions for self suggesting superlubric cases like 1/sqrt(2) ratios and such.
Nonbonded forces for assembly
See main page: Assembly from atomically precise nanoscale and microscale parts
(wiki-TODO: add more details here)
Related
- Intercrystolecular interactions < you are here
- Intercrystolecular snapping modes
- Intercrystolecular levitation