SAM-溶媒界面の界面熱抵抗に関する分子動力学的研究(熱工学,内燃機関,動力など)

概要

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In this paper, we perform molecular dynamics (MD) simulations of the interfaces composed of the self-assembled monolayer (SAM) and organic solvent in order to investigate the interfacial heat transfer characteristics of SAMs from the microscopic viewpoint. Archetypal SAMs, i.e., alkanethiol molecules chemically adsorbed on Au (111) substrate, and toluene solvent are adopted for the computational system. Two alkanethiols with different chain lengths, that is, 1-propanethiol (C_3H_7SH) and 1-dodecanethiol (C_<12>H_<25>SH), are used for SAM interface systems. In addition to the SAM interfaces, bare solid substrate without SAM are examined for comparison of the heat transfer characteristics. Nonequilibrium MD (NEMD) simulations in which a temperature gradient is imposed across the interface are performed and the interfacial thermal resistance in each system is discussed. As a result, it is shown that the SAM-solvent interfaces have the smaller thermal resistance as compared with that at the bare Au interface. In order to investigate the mechanisms of the small resistance at SAM-solvent interface, a vibrational character of molecules in the interface region and an adsorbed structure of solvent molecules are discussed.
一般社団法人日本機械学会の論文
2009-01-25