2012
DOI: 10.1039/c2cp41597f
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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 CH(4) isothermal adsorption experiments at 40 K, surface areas of 280 ± 30 m(2) g(-1) for the ASW deposits an… Show more

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Cited by 33 publications
(44 citation statements)
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“…Here, the kinetics of crystallization of the H 2 O:CD 3 OD and H 2 O:CD 3 ND 2 ice mixtures is described using the formalism employed above for H/D exchanges. The rate of crystallization of pure ASW has been investigated in many previous studies (Schmitt et al, 1989;Dohnálek et al, 1999Dohnálek et al, , 2000Hage et al, 1994Hage et al, , 1995Jenniskens and Blake, 1996;Maté et al, 2012;Safarik et al, 2003;Safarik and Mullins, 2004;Smith et al, 2011). The kinetics has been shown to follow nucleation models but a large variation in the Avrami exponents and in the activation energies (from $5000 K to 10,000 K) was observed.…”
Section: Kinetics Of Crystallizationmentioning
confidence: 87%
See 1 more Smart Citation
“…Here, the kinetics of crystallization of the H 2 O:CD 3 OD and H 2 O:CD 3 ND 2 ice mixtures is described using the formalism employed above for H/D exchanges. The rate of crystallization of pure ASW has been investigated in many previous studies (Schmitt et al, 1989;Dohnálek et al, 1999Dohnálek et al, , 2000Hage et al, 1994Hage et al, , 1995Jenniskens and Blake, 1996;Maté et al, 2012;Safarik et al, 2003;Safarik and Mullins, 2004;Smith et al, 2011). The kinetics has been shown to follow nucleation models but a large variation in the Avrami exponents and in the activation energies (from $5000 K to 10,000 K) was observed.…”
Section: Kinetics Of Crystallizationmentioning
confidence: 87%
“…These variations are primarily due to different experimental conditions. The crystallization process is indeed sensitive to many factors including the underlying substrate, film deposition temperature (Dohnálek et al, 2000;Maté et al, 2012), film thickness and density and, most importantly, deposition and heating rates. The induced variations are rather complex.…”
Section: Exchange Mechanismsmentioning
confidence: 99%
“…In the laboratory, vapour deposition of one gas phase constituent (e.g., H 2 O) on a cold substrate results in a two-phase composite ice sample by taking the presence of pores into account, which are inevitably formed during growth (Brown et al 1996;Dohnálek et al 2003;Maté et al 2012). The resulting porosity depends on experimental conditions, such as the growth temperature, the deposition rate, and the growth angle.…”
Section: Introductionmentioning
confidence: 99%
“…In the laboratory, background deposition of gas-phase constituents on a cold substrate results in a multi-phase composite ice sample by taking the presence of pores into account. These pores are inevitably formed during growth (Brown et al 1996;Dohnálek et al 2003;Maté et al 2012;Bossa et al 2014). However, water ices formed experimentally from atomic hydrogen and oxygen present a compact structure (Oba et al 2009).…”
Section: Introductionmentioning
confidence: 99%