Comparison between the structures of liquid water and (high- and low-density) amorphous ice

2000 ◽  
Vol 2 (12) ◽  
pp. 2703-2706 ◽  
Author(s):  
László Pusztai
Keyword(s):  
Liquid Water ◽  
Low Density ◽  
Amorphous Ice

scholarly journals Evidence for liquid water during the high-density to low-density amorphous ice transition

2009 ◽  
Vol 106 (12) ◽  
pp. 4596-4600 ◽  
Author(s):  
C. U. Kim ◽  
B. Barstow ◽  
M. W. Tate ◽  
S. M. Gruner
Keyword(s):  
Liquid Water ◽  
High Density ◽  
Low Density ◽  
Amorphous Ice

scholarly journals X-ray studies of the transformation from high- to low-density amorphous water

2019 ◽  
Vol 377 (2146) ◽  
pp. 20180164 ◽  
Author(s):  
Daniel Mariedahl ◽  
Fivos Perakis ◽  
Alexander Späh ◽  
Harshad Pathak ◽  
Kyung Hwan Kim ◽  
...  
Keyword(s):  
Ambient Pressure ◽  
Structural Evolution ◽  
High Energy ◽  
Real Space ◽  
High Density ◽  
Low Density ◽  
X Ray ◽  
Amorphous Ice ◽  
Density State ◽  
Amorphous States

Here we report about the structural evolution during the conversion from high-density amorphous ices at ambient pressure to the low-density state. Using high-energy X-ray diffraction, we have monitored the transformation by following in reciprocal space the structure factor S OO ( Q ) and derived in real space the pair distribution function g OO ( r ). Heating equilibrated high-density amorphous ice (eHDA) at a fast rate (4 K min –1 ), the transition to the low-density form occurs very rapidly, while domains of both high- and low-density coexist. On the other hand, the transition in the case of unannealed HDA (uHDA) and very-high-density amorphous ice is more complex and of continuous nature. The direct comparison of eHDA and uHDA indicates that the molecular structure of uHDA contains a larger amount of tetrahedral motives. The different crystallization behaviour of the derived low-density amorphous states is interpreted as emanating from increased tetrahedral coordination present in uHDA. This article is part of the theme issue ‘The physics and chemistry of ice: scaffolding across scales, from the viability of life to the formation of planets'.

Structure of high- and low-density amorphous ice

2000 ◽  
Vol 61 (1) ◽  
pp. 28-31 ◽  
Author(s):  
László Pusztai
Keyword(s):  
Low Density ◽  
Amorphous Ice

Nature of the transformations of ice I and low‐density amorphous ice to high‐density amorphous ice

1989 ◽  
Vol 91 (11) ◽  
pp. 7187-7192 ◽  
Author(s):  
M. A. Floriano ◽  
Y. P. Handa ◽  
D. D. Klug ◽  
Edward Whalley
Keyword(s):  
High Density ◽  
Low Density ◽  
Amorphous Ice

Structural Relaxation of Low-Density Amorphous Ice upon Thermal Annealing

2013 ◽  
Vol 4 (21) ◽  
pp. 3672-3676 ◽  
Author(s):  
Jacob J. Shephard ◽  
John S. O. Evans ◽  
Christoph G. Salzmann
Keyword(s):  
Thermal Annealing ◽  
Structural Relaxation ◽  
Low Density ◽  
Amorphous Ice

Minimisation de la sensibilité à l'eau de composites cimentaires argile-schistes-bois

2000 ◽  
Vol 27 (1) ◽  
pp. 101-111 ◽  
Author(s):  
A Ledhem ◽  
R M Dheilly ◽  
M Benmalek ◽  
M Queneudec
Keyword(s):  
Liquid Water ◽  
Construction Materials ◽  
Thermal Characteristics ◽  
Boiling Water ◽  
Mechanical Resistance ◽  
Low Density ◽  
Wood Particles ◽  
The Matrix ◽  
Dimensional Variation ◽  
Sufficient Reduction

The use of clay and wood waste in construction materials points out to a sensitivity to water, which is susceptible to reduce their durability. This work has first been interested in the influence of different constituents on the extreme dimensional variations (EDV) of such cementing composites. A formulation allowing the conciliation of environmental imperatives, interesting mechanical and thermal characteristics, and low density has been proposed. However, the EDVs remain above the required objective. In order to reach this value, different treatments have been examined. The addition of alkali-resistant fiberglass in the matrix did not lead to satisfactory results. Not only is the reduction of the EDVs insufficient for reasonable proportions of fibers, but this treatment also increases the proportion of absorbed water in presence of liquid water. Taken separately, both types of treatments used for wood particles - neutralization with hydraulic binders and extraction with boiling water of hydro-soluble compounds - also do not allow a sufficient reduction of EDVs. However, the combination of these two treatments allows the achievement of EDV [Formula: see text] 1 mm/m. Such a treatment improves the mechanical resistance without significantly altering the thermal performances.Key words: wood concrete, extreme dimensional variation, fiberglass, neutralization, hydrolysis.[Journal translation]

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