Thermal conductivity of tetrahydrofuran hydrate

Кривчиков, А. И.; Manzheliı̆, V. G.; Korolyuk, O. A.; Gorodilov, B. Ya.; Romantsova, O. O.

doi:10.1039/b418602h

Cited by 55 publications

(33 citation statements)

References 28 publications

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“…The container for the sample [19] was a stainless steel tube. Two copper wires 1 mm in diameter were passed through the container perpendicular to its axis, which permitted measurement of the average temperature along the isothermal plane running across the sample.…”

Section: Experiments and Discussionmentioning

confidence: 99%

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Deuteration effects in the thermal conductivity of molecular glasses

Кривчиков

Bermejo

Sharapova

et al. 2011

Low Temperature Physics

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The thermal conductivity κ(T) of pure deuterated ethanol has been measured under its equilibrium vapor pressure in its orientationally-ordered crystal (T = 2 K -T m ), orientational glass and the glass state (T = 2 K -T g , T g is the glass transition temperature) solid phases. The temperature dependence of the conductivity is well described by a sum of two contributions: κ(T) = κ I (T) + κ II (T), where κ I (T) account for the heat transport by acoustic phonons and κ II (T) for the heat transfer by localized high-frequency excitations respectively. The thermal conductivities of deuterated and hydrogenated ethanols are compared in different phases. The phonon scattering mechanisms in the glasses have been analyzed. In the investigated glasses the effect of complete deuteration shows up as a contribution κ II (T).

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Section: Experiments and Discussionmentioning

confidence: 99%

“…The thermal conductivity of different phases of solid C 2 D 5 OD was measured under equilibrium vapor pressure by means of a setup [19] using the steady-state potentiometric method. The container for the sample [19] was a stainless steel tube.…”

Section: Experiments and Discussionmentioning

confidence: 99%

Deuteration effects in the thermal conductivity of molecular glasses

Кривчиков

Bermejo

Sharapova

et al. 2011

Low Temperature Physics

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“…The container for the sample [20] was a stainless steel tube. Two copper wires 1 mm in diameter were placed across the container perpendicular to its axis, which permitted measurement of the average temperature in the isothermal planes across the sample.…”

Section: Experiments and Discussionmentioning

confidence: 99%

“…The thermal conductivity of different phases of solid methanol was measured under equilibrium vapor pressure in a set-up described earlier [20] using the steady-state potentiometric method. The container for the sample [20] was a stainless steel tube.…”

Section: Experiments and Discussionmentioning

confidence: 99%

Heat transfer in solid methyl alcohol

Korolyuk

Кривчиков

Sharapova

et al. 2009

Low Temperature Physics

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Thermal conductivity coefficient k(T) of two crystalline (orientationally-ordered and orientationally-disordered) phases of pure methanol (at temperatures from 2 K to T m , T m is the melting temperature), CH 3 OH + 6.6 % H 2 O glass from 2 K to T g , T g is the glass transition temperature and a supercooled liquid from T g to 120 K has been measured under equilibrium vapor pressure. The dependence k(T ) is described approximately as a sum of two contributions: k I (T) describing heat transport by acoustic phonons and k II (T) -by localized high-frequency excitations. The temperature dependences of the thermal conductivity of primary monoatomic alcohols CH 3 OH, C 2 H 5 OH, and C 3 H 7 OH in the glass state have been compared. Different mechanisms of phonon scattering in the crystalline phases and glass have been analyzed. The k II (T) has been calculated within the Cahill-Pohl model. There is an anomaly of the thermal conductivity of the glass state near T g (a smeared minimum in the k(T) -curve).

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“…There are limited data on the conductivity of clathrates at low temperatures. Their thermal conductivity has been measured on gas hydrates of structure I as CH 4 (Krivchikov et al 2005a), Xe (Handa & Cook 1987;Krivchikov et al 2006) and ethylene oxide (Cook & Laubitz 1983), and gas hydrates of structure II as tetrahydrofuran (Ross & Andersson 1982;Tse & White 1988;Andersson & Suga 1996;Krivchikov et al 2005b), dioxolane (Andersson & Ross 1983;Ahmad & Phillips 1987) and cyclobutanone (Andersson & Ross 1983) in a wide range of temperatures. It is very challenging to measure the bulk thermal conductivity of a homogeneous continuous solid (Krivchikov et al 2007).…”

Section: Thermal Conductivity Of Clathratesmentioning

confidence: 99%

A cometary nucleus model taking into account all phase changes of water ice: amorphous, crystalline, and clathrate

Marboeuf

Schmitt

Petit

et al. 2012

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Context. Current theories, models of cometary nuclei and of ice formation in the protoplanetary disk, and laboratory studies suggest that cometary materials could be formed of pure crystalline water ice, amorphous water ice, clathrate hydrate, or a mixture of these structures of water ice. However, current models of cometary nuclei consider only two forms of ice during the thermodynamic evolution of comets: amorphous and crystalline water ices. Aims. In this work, we have developed a model of cometary nucleus that takes into account all water ice structures and phase changes in order to predict the outgassing profile of volatile molecules that could be measured by the Rosetta mission and can be used to constrain the structural type of ice existing in the interior of the Comet 67P/Churyumov-Gerasimenko, the target comet of the Rosetta mission, and, hopefully, its initial composition. Methods. We added the physic of formation/dissociation of clathrate hydrates in addition to others physical processes that are taken into account in models without clathrate hydrates. All thermal changes, as well as the release and trapping of gas with water phase changes are taken into account. Results. This model describes heat transmission, latent heat exchanges, all water ices structures and transitions (amorphous-to-pure crystalline, amorphous-to-clathrate hydrates and pure crystalline-to-clathrate hydrates and vise versa), sublimation/recondensation of volatile molecules in the nucleus, gas diffusion, gas released and trapped by crystallization and clathrate formation/dissociation processes, as well as gas and dust release and mantle formation at the surface. Applying this model to the comet 67P/ChuryumovGerasimenko, results show different outgassing profiles of volatiles molecules from the nucleus depending on the water ice structure, the distribution of volatile molecules between the "trapped" and "condensed" states in the nucleus and the thermal inertia of its porous matrix. Conclusions. Given these results, we pretend that this model is able to constrain the water ice structure and chemical composition in comets from outgassing profiles of volatile molecules, and especially those of the target comet of the Rosetta mission.

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Thermal conductivity of tetrahydrofuran hydrate

Cited by 55 publications

References 28 publications

Deuteration effects in the thermal conductivity of molecular glasses

Deuteration effects in the thermal conductivity of molecular glasses

Heat transfer in solid methyl alcohol

A cometary nucleus model taking into account all phase changes of water ice: amorphous, crystalline, and clathrate

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