Thermal conductivity of glassy primary mono-hydroxylalcohols.

Thermalconductivity κ(T) data for homologous series of primarymono-hydric alcohols – methanol, ethanol, 1-propanol, 1-butanol – within their molecular glass states are analyzed within the temperature region stretching from 2 K up to the glass transition Tg. Below 7 K κ(T) increases with the number of carbon atoms in the molecule. Furthermore, its temperature dependence exhibits a behavior akin to that predicted by the phenomenological model of soft potentials (SPM). The data are then rationalized in terms of the SPM parameters such as characteristic energy W and the parameter ¯С which measures the strength of the coupling of acoustic modes with two-level systems. The dependence of such parameters upon the molecular mass of the alcohol seems to agree with the SPM predictions. The parameters ¯С and W were used to calculate the boson peak energies. The values obtained agree well with literature data.This work was financially supported in part by the Spanish Ministry of Science and Innovation (Grants No.MAT2007-65711-C-4-01) and joint projects of NAS of Ukraine and Russian Foundation for Fundamental Research (N 9-2009).Peer Reviewe

Thermal conductivity of glassy primary mono-hydroxylalcohols.

Thermalconductivity κ(T) data for homologous series of primarymono-hydric alcohols – methanol, ethanol, 1-propanol, 1-butanol – within their molecular glass states are analyzed within the temperature region stretching from 2 K up to the glass transition Tg. Below 7 K κ(T) increases with the number of carbon atoms in the molecule. Furthermore, its temperature dependence exhibits a behavior akin to that predicted by the phenomenological model of soft potentials (SPM). The data are then rationalized in terms of the SPM parameters such as characteristic energy W and the parameter ¯С which measures the strength of the coupling of acoustic modes with two-level systems. The dependence of such parameters upon the molecular mass of the alcohol seems to agree with the SPM predictions. The parameters ¯С and W were used to calculate the boson peak energies. The values obtained agree well with literature data.This work was financially supported in part by the Spanish Ministry of Science and Innovation (Grants No.MAT2007-65711-C-4-01) and joint projects of NAS of Ukraine and Russian Foundation for Fundamental Research (N 9-2009).Peer Reviewe