Surface passivation - Revision history

Apm: /* Passivation difficulty */ some cleanup

2025-11-13T07:18:53Z

Passivation difficulty: some cleanup

← Older revision		Revision as of 09:18, 13 November 2025
Line 39:		Line 39:
	= Passivation difficulty =		= Passivation difficulty =

	Some materials are very easy to passivate. This includes diamondoid materials in the more narrow sense. ~~Diamond,~~ lonsdaleite (= hexagonal diamond), moissanite (= gem ~~guality~~ silicon carbide), silicon (cubic and hexagonal), boron-nitride and similar compounds.		Some (smaller group of materials) are very easy to passivate. <br>
			This includes diamondoid materials in the more narrow sense. <br>
			* diamond & lonsdaleite (= hexagonal diamond),
			* moissanite (= gem quality silicon carbide),
			* silicon (cubic and hexagonal),
			* cubic boron-nitride
			* and similar compounds (some III-V semiconductors).

	Others may be more difficult.		Others (bigger group of materials) may be more difficult. <br>
	Polymorphs of silicon dioxide (e.g. [[quartz]]) has -OH groups sticking out when passivated.		Polymorphs of silicon dioxide (e.g. [[quartz]]) has -OH groups sticking out when passivated. <br>
	Not entirely unreactive to Water. (Big meshes of oxides may make it harder to create sliding interfaces)		Not entirely unreactive to Water. (Big meshes of oxides may make it harder to create sliding interfaces) <ve>

	Salts (like e.g. ~~preiclase~~ MgO) may not be passivatable at all and thus have only use as structural framework material.		Salts (like e.g. NaCl, MgCl2 or somewhat salt like compounds like periclase MgO) <br>
			may not be passivatable at all and thus have only use as structural framework material. <br>
			Possibly including mono transition metal monoxides. <br>
			Particularly mono [[titanium]] mono nonmetallides TiC, TiN, TiO, … <br>

	= Where leaving things unpassivated makes sense =		= Where leaving things unpassivated makes sense =

Apm at 11:14, 13 December 2023

2023-12-13T11:14:13Z

← Older revision		Revision as of 13:14, 13 December 2023
Line 1:		Line 1:
			New page: '''[[Nanoscale surface passivation]]'''

	Just like the flour on the dough hydrogen can keep parts from sticking together (crude analogy)		Just like the flour on the dough hydrogen can keep parts from sticking together (crude analogy)

Apm: /* Related */ bold

2023-12-13T11:13:32Z

Related: bold

← Older revision		Revision as of 13:13, 13 December 2023
Line 60:		Line 60:
	= Related =		= Related =

	* New page: [[Nanoscale surface passivation]]		* New page: '''[[Nanoscale surface passivation]]'''
	* [[Passivation (disambiguation)]]		* [[Passivation (disambiguation)]]
	* [[Passivation bending issue]]		* [[Passivation bending issue]]

Apm: /* Related / Oxidation

2023-12-13T08:13:36Z

Related: * Oxidation

← Older revision		Revision as of 10:13, 13 December 2023
Line 67:		Line 67:
	* [[Superlubrication]]		* [[Superlubrication]]
	* [[Limits of construction kit analogy]]		* [[Limits of construction kit analogy]]
			* [[Oxidation]]

	= External links =		= External links =

Apm: /* Where leaving things unpassivated makes sense */ spelling

2021-07-08T11:13:56Z

Where leaving things unpassivated makes sense: spelling

← Older revision		Revision as of 13:13, 8 July 2021
Line 47:		Line 47:
	= Where leaving things unpassivated makes sense =		= Where leaving things unpassivated makes sense =

	Advanced gem-gum nanosystems will have their internal volumes for all practical ~~purpouses~~ perfectly sealed off by walls so dangling bonds not exposed to the outside (usually earths atmosphere or more or less salty water) are totally ok.		Advanced gem-gum nanosystems will have their internal volumes for all practical purposes perfectly sealed off by walls so dangling bonds not exposed to the outside (usually earths atmosphere or more or less salty water) are totally ok.

	A lot of dangling bonds can even help. In the unlikely event that a stray molecule found its way in it will not get very far to critical points like e.g. mechanosynthetic cores or to points where it could act like a wrench in the gears. (Note that not every collision of a molecule with a radical automatically leads to a bonding event - misaligned spins can lead to repulsion force due to Pauli exclusion principle.)		A lot of dangling bonds can even help. In the unlikely event that a stray molecule found its way in it will not get very far to critical points like e.g. mechanosynthetic cores or to points where it could act like a wrench in the gears. (Note that not every collision of a molecule with a radical automatically leads to a bonding event - misaligned spins can lead to repulsion force due to Pauli exclusion principle.)

Apm: /* Related / added Passivation (disambiguation)

2021-05-19T15:48:55Z

Related: added * Passivation (disambiguation)

← Older revision		Revision as of 17:48, 19 May 2021
Line 61:		Line 61:

	* New page: [[Nanoscale surface passivation]]		* New page: [[Nanoscale surface passivation]]
			* [[Passivation (disambiguation)]]
	* [[Passivation bending issue]]		* [[Passivation bending issue]]
	* [[Passivation layer mineral]]		* [[Passivation layer mineral]]

Apm: added wikitodo about page merging plan

2021-05-16T06:48:52Z

added wikitodo about page merging plan

← Older revision		Revision as of 08:48, 16 May 2021
Line 7:		Line 7:
	And would<br>		And would<br>
	B) react with any possibly present fluid or gaseous surrounding medium if it is not extremely nonreactive (like noble gasses).		B) react with any possibly present fluid or gaseous surrounding medium if it is not extremely nonreactive (like noble gasses).

			{{wikitodo\|Eventually merge this page into the new one: '''[[nanoscale surface passivation]]'''. Think about where to redirect [[surface passivation]].}}

	= Methods for passivation =		= Methods for passivation =

Apm: /* Related / added link New page: Nanoscale surface passivation

2021-05-16T06:45:10Z

Related: added link * New page: Nanoscale surface passivation

← Older revision		Revision as of 08:45, 16 May 2021
Line 58:		Line 58:
	= Related =		= Related =

			* New page: [[Nanoscale surface passivation]]
	* [[Passivation bending issue]]		* [[Passivation bending issue]]
	* [[Passivation layer mineral]]		* [[Passivation layer mineral]]

Apm: /* Snapback stiffness threashold and friction */ added link to page snapback

2021-05-16T06:40:52Z

Snapback stiffness threashold and friction: added link to page snapback

← Older revision		Revision as of 08:40, 16 May 2021
Line 31:		Line 31:
	== Snapback stiffness threashold and friction ==		== Snapback stiffness threashold and friction ==

	The more bonds the passivation atoms have to the substrate elements the stiffer are they against sideward force. There seems to be a critical point at which "snapback" starts to occur when two surfaces are simultaneously pressed and slid against each other. This should massively increase energy dissipation (more friction). This might be very useful for dissipation elements (mechanical resistors).		The more bonds the passivation atoms have to the substrate elements the stiffer are they against sideward force. There seems to be a critical point at which "[[snapback]]" starts to occur when two surfaces are simultaneously pressed and slid against each other. This should massively increase energy dissipation (more friction). This might be very useful for dissipation elements (mechanical resistors).

	= Passivation difficulty =		= Passivation difficulty =

Apm: /* Passivation difficulty */ added link to yet unwritten page: quartz

2021-03-30T09:06:42Z

Passivation difficulty: added link to yet unwritten page: quartz

← Older revision		Revision as of 11:06, 30 March 2021
Line 38:		Line 38:

	Others may be more difficult.		Others may be more difficult.
	Polymorphs of silicon dioxide (e.g. quartz) has -OH groups sticking out when passivated.		Polymorphs of silicon dioxide (e.g. [[quartz]]) has -OH groups sticking out when passivated.
	Not entirely unreactive to Water. (Big meshes of oxides may make it harder to create sliding interfaces)		Not entirely unreactive to Water. (Big meshes of oxides may make it harder to create sliding interfaces)