Talk:Amorphous ice

message: I merged these 5 articles into one because they were redundant and having separate articles was stupid, but then I googled and realized all the content was just cut-and-pasted from http://www.lsbu.ac.uk/water/amorph.html. I'm working on writing some original content (at Amorphous ice/Temp) now. —Keenan Pepper 16:14, 3 October 2005 (UTC)
thread_title: Untitled

message: It happens from time to time glass/bottle of water to be found liquid-like if left outdoors when temperature moves from above 0 to below 0 C. On first touch, bottle suddenly freezes. We were explained that this is because water acquired same structure as glass (i.e. Amorphous ice), and then it changed to real cristal-ice. But as I read this article, this does not match -- amorphous ice requires sudden, not slow temperature change. Could someone explain me mentioned phenomenon? Saigon from europe 15:15, 7 October 2005 (UTC)
replies: text: This sounds like supercooling to me. If you carefully cool water in a smooth container to below its freezing point but above its glass transition temperature, it will remain liquid. A supercooled liquid will crystallize suddenly if it's disturbed and heat up in the process (heat of fusion). Amorphous ice is what you get if you continue cooling it past the glass transition temperature of water (which is difficult to measure but it's definitely colder than it ever gets outdoors). Because it gets easier to crystallize as the temperature decreases, it's practically impossible to reach the glass transition temperature unless you do it really fast, hence the difficulty of making amorphous ice. —Keenan Pepper 16:24, 7 October 2005 (UTC)
replies: text:  Thanks for the explanation :) Saigon from europe 21:29, 9 October 2005 (UTC)
thread_title:  Creation of amorphous ice at home 

message: Is there any utility to amorphous glass, or is it solely a curiosity?  Perhaps this ice has some interesting properties?  All I really know at this point is its definition and how to make it.
:Amorphous glass or amorphous ice?  All glass is an amorphous solid, as far as I know... so its utility is for things like Window and Eyeglasses.
:I don't know if amorphous ice has any utility. :) --Syrthiss 19:47, 7 October 2005 (UTC)
replies: text: And if you would like to make sinking ice cubes this might help... --Mac Davis 12:51, 8 October 2005 (UTC)

text: The interest in amorphous ice has something to do with the density anomaly of liquid water, ie that liquid water expands upon cooling below 4 C. Some theories of liquid water structure and dynamics postulate liquid water as a mixture of low- and high-density phases that are very intimately mixed. If the boundary between these two phases is extended into the supercooled region of the phase diagram, there should be (at least) two corresponding amorphous "phases". However, since amorphous solids are nonergodic systems, it is difficult to defend "HDA" and "LDA" as strictly analogous to the liquid. Regardless, there is great interest and effort ongoing to understand the properties of liquid water since it is such an important solvent. The amorphous solid phases of water continue to inform  our general understanding of this material. 
An interesting aside is that a few other materials, such as SiO2 and GeO2, show similar density anomalies in their liquids, and polyamorphism in their vitreous solids.
Having worked with VHDA and HDA, I can testify that sinking ice cubes can be more conveniently created from deuterium oxide :) Robby.hart 04:29, 31 January 2006 (UTC)

text: But is it safe to put deuterium oxide cubes in a drink? ;) I could see some expensive restaurant having a sinking ice cube machine, if the ice would stay dense enough long enough to stay sunk, and not do things like blow the drinks out of the glasses if it suddenly crystallizes and expands.  —Preceding unsigned comment added by Bizzybody (talk • contribs) 08:30, 20 May 2010 (UTC)
thread_title:  Relevance 

message: I've just gone ahead and changed the units to something more sensible (Kelvins, with Celcius and Fahrenheit in parentheses). Also fixed botched conversion from GPa to kilobars --Sander Pronk 21:11, 7 October 2005 (UTC)
thread_title:  Units 

message: "Once formed VHDA is more stable than either HDA or LDA and can retain its structure for months at normal atmospheric pressure"
:This needs a temperature context as wel
::And a referenceJohn Loveday 17:27, 14 June 2006 (UTC)
replies: text: Also, do any of these forms of ice exist naturally on earth (e.g. deep in polar icecaps)? - MPF 19:24, 19 December 2005 (UTC)
replies: text:  No the temperatures are too low John Loveday 17:27, 14 June 2006 (UTC)

text: We need a reference other than "liquid nitrogen temperatures" in this para Ry Jones 19:12, 24 November 2006 (UTC)
thread_title:  Info request 

message: ＂The difference is that pure water forms crystals much more readily than the heterogeneous mixture of ingredients in ice cream, so amorphous water is more difficult to produce, requiring a physics lab rather than an ice cream churn.＂
Shouldn't the "amorphous water" be "amorphous ice"? 無聲 (talk) 02:38, 10 October 2011 (UTC)
replies: text: Yes, changed, thank you. Materialscientist (talk) 02:55, 10 October 2011 (UTC)
thread_title:  amorphous water, amorphous ice 

message: First, atoms and molecules are not the same, second atoms in ice (see water) are not random. Third point, the short range order is not the same as glass, so, although you meant amorphous by the same randomness saying the molecules are randomly arranged like the molecules of common glass is incorrect when both substances have short range order based on their constituent molecules. --184.96.213.201 (talk) 15:16, 18 October 2013 (UTC)
replies: text: I removed the offending clause.--Wikimedes (talk) 18:00, 9 November 2015 (UTC)
thread_title:  Areanged randomly like atoms of glass, atoms and molecules are not the same thing 

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thread_title:  External links modified 

message: Vitreous water is a concept used in the scientific literature (Google Scholar) and notably relevant to this year's Chemistry Nobel prize Jacques Dubochet. I created a redirect so that users can find the right page for this concept. (CoI: I am in the same University as Dubochet.)Marcrr (talk) 16:56, 20 November 2017 (UTC)
thread_title:  Vitreous water redirect