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Issue 30, 2012
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Morphology and crystallization kinetics of compact (HGW) and porous (ASW) amorphous water ice

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Abstract

An investigation of porosity and isothermal crystallization kinetics of amorphous ice produced either by background water vapour deposition (ASW) or by hyperquenching of liquid droplets (HGW) is presented. These two types of ice are relevant for astronomical ice research (Gálvez et al., Astrophys. J., 2010, 724, 539) and are studied here for the first time under comparable experimental conditions. From CH4 isothermal adsorption experiments at 40 K, surface areas of 280 ± 30 m2 g−1 for the ASW deposits and of 40 ± 12 m2 g−1 for comparable HGW samples were obtained. The crystallization kinetics was studied at 150 K by following the evolution of the band shape of the OD stretching vibration in HDO doped ASW and HGW samples generated at 14 K, 40 K and 90 K. Comparable rate constants of ∼7 × 10−4 s−1 were obtained in all cases. However a significant difference was found between the n Avrami parameter of the samples generated at 14 K (n ∼ 1) and that of the rest (n > 2). This result hints at the possible existence of a structurally different form of amorphous ice for very low generation temperatures, already suggested in previous literature works.

Graphical abstract: Morphology and crystallization kinetics of compact (HGW) and porous (ASW) amorphous water ice

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Publication details

The article was received on 23 Mar 2012, accepted on 11 Jun 2012 and first published on 13 Jun 2012


Article type: Paper
DOI: 10.1039/C2CP41597F
Phys. Chem. Chem. Phys., 2012,14, 10595-10602

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    Morphology and crystallization kinetics of compact (HGW) and porous (ASW) amorphous water ice

    B. Maté, Y. Rodríguez-Lazcano and V. J. Herrero, Phys. Chem. Chem. Phys., 2012, 14, 10595
    DOI: 10.1039/C2CP41597F

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