Heat transfer in solid methyl alcohol

Korolyuk, O. A.; Кривчиков, А. И.; Sharapova, I. V.; Romantsova, O. O.

doi:10.1063/1.3115810

Cited by 16 publications

(13 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(1) was previously employed to interpret the thermal conductivity of crystalline methanol, ethanol and 1-propanol [7] and glassy methanol [10]. In case of glasses the contribution κ I (T) is well described in the soft potential model [1,14,17], which describes the phonon scattering caused mainly by the low-energy excitations of a strongly anharmonic ensemble of particles.…”

Section: Interpretation Of Experimental Resultsmentioning

confidence: 99%

Deuteration effects in the thermal conductivity of molecular glasses

Кривчиков

Bermejo

Sharapova

et al. 2011

Low Temperature Physics

Self Cite

View full text Add to dashboard Cite

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).

show abstract

Section: Interpretation Of Experimental Resultsmentioning

confidence: 99%

Deuteration effects in the thermal conductivity of molecular glasses

Кривчиков

Bermejo

Sharapova

et al. 2011

Low Temperature Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…A crystalline sample of methanol was prepared in the measuring container on slow cooling the liquid slightly below T m . According to the chromatographic analysis, [8] 990 [9] 60.09 __ P2 1 /m monoclinic [9] the water content in pure methanol was less than 0.2% H 2 O [11]. The ethanol sample was prepared in the state of a glass by very fast cooling of the liquid (over 50 K/min) passing through the temperature of glass formation T g to the boiling temperature of liquid nitrogen (the container with the sample at room temperature was immersed in liquid nitrogen).…”

Section: Methodsmentioning

confidence: 99%

“…On a further increase of temperature, most materials examined so far follow the 1/Ò law. It was found however that k(T) of some simple alcohols deviated from this law [1,2,10,11] but the reason for this behavior was not clear at that moment.…”

Section: Introductionmentioning

confidence: 99%

“…3. Temperature dependences of the thermal conductivity -temperature product for methanol: x -experimental results for the orientationally ordered and orientationally disordered phases [11]; black straight line -approximation of experimental results by Eq. (1); -contribution k II (Ò) calculated by Eq.…”

Section: Experimental Evidence Of the Role Of Quasilocalized Phonons mentioning

confidence: 99%

See 1 more Smart Citation

Experimental evidence of the role of quasilocalized phonons in the thermal conductivity of simple alcohols in orientationally ordered crystalline phases

Кривчиков¹,

Sharapova²,

Korolyuk³

et al. 2009

Low Temperature Physics

Self Cite

View full text Add to dashboard Cite

The thermal conductivity k(T) of crystalline alcohols (methyl, ethyl and 1-propyl) within their thermodynamic equilibrium phases for T ³ 2 K and under the equilibrium vapor pressures has been measured and analyzed. While such compounds usually exhibit a rich polymorphism including amorphous and partially ordered crystals, the phases here explored correspond to crystals showing complete orientational order. The results show that the temperature dependence of k(T) above its maximum deviates from the expected decrease following a 1/Ò law with increasing temperature arising from anharmonic interactions involving acoustic excitations. Such a deviation is here attributed to the presence of a component k II (T) corresponding to the shortest-lifetime phonons (Cahill-Pohl model) additional to that k I (T) related to propagating phonons and thus: k(T) = k I (T) + k II (T). Above T = 40 K k I (T) does follow the law 1/Ò and k II (T) is basically temperature independent. The component k I (T) is well described by the Debye-Peierls model taking into account the phonon-phonon Umklapp processes and phonon scattering by dislocations. In turn, the contribution k II (T) is attributed to the effects of higher lying excitations which get thermally populated above some 40 K. Finally, a systematic trend is found concerning the strength of phonon-phonon scattering which is seen to diminish as the number of carbon atoms in the alcohol molecule increases. PACS: 66.70.-f Nonelectronic thermal conduction and heat-pulse propagation in solids; thermal waves; 63.20.-e Phonons in crystal lattices.

show abstract

“…In all previous studies, locons have comprised the smallest group of modes 21,35,41,45 and they have been assumed to be too localized to contribute to TC in a significant way, 19,21,30,[46][47][48][49][50] although there has been recent evidence that this may not always be the case. 35 The AF framework, which describes the contributions of diffusons, has been successfully applied to the explain TC of glasses, [49][50][51][52][53][54][55][56][57][58][59][60][61] amorphous semiconductors, 24,44,45,[62][63][64][65][66][67][68][69] solid solutions, 70,71 organic compounds, [72][73][74] composites, 75,76 phase change materials, 77 and low-dimension materials. 78,79 However, the AF method neglect...…”

mentioning

confidence: 99%

Normal Mode Analysis of The Thermal conductivity in Amorphous Polymers: The Importance of Localized Modes

DeAngelis

Chen

et al. 2021

Preprint

View full text Add to dashboard Cite

Polymers are a unique class of materials from the perspective of normal mode analysis. Polymers consist of individual chains with repeating units and strong intra-chain covalent bonds, and amorphous arrangements among chains with weak inter-chain van der Waals and for some polymers also electrostatic interactions. Intuitively, this strong heterogeneity in bond strength can give rise to interesting features in the constituent phonons, but such effects have not been studied deeply before. Here, we use lattice dynamics and molecular dynamics to perform modal analysis of the thermal conductivity in amorphous polymers for the first time. We find an abnormally large population of localized modes in amorphous polymers, which is dramatically different from amorphous inorganic materials. Contrary to the common picture of thermal transport, localized modes in amorphous polymers are found to be the dominant contributors to thermal conductivity. We find that a significant portion of the localization happens within individual chains, but heat is dominantly conducted when localized modes involve two chains. These results suggest that even though each polymer is different, localized modes play a key role. The results provide new perspective on why polymer thermal conductivity is generally quite low and gives insight into how to potentially change it.

show abstract

Heat transfer in solid methyl alcohol

Cited by 16 publications

References 45 publications

Deuteration effects in the thermal conductivity of molecular glasses

Deuteration effects in the thermal conductivity of molecular glasses

Experimental evidence of the role of quasilocalized phonons in the thermal conductivity of simple alcohols in orientationally ordered crystalline phases

Normal Mode Analysis of The Thermal conductivity in Amorphous Polymers: The Importance of Localized Modes

Contact Info

Product

Resources

About