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论文类型：期刊论文

发表时间：2013-08-01

发表刊物：COMPUTATIONAL AND THEORETICAL CHEMISTRY

收录刊物：SCIE

卷号：1017

页面范围：126-135

ISSN号：2210-271X

关键字：Molecular dynamics simulation; Water; Dimethyl sulfoxide; Cluster

摘要：Using molecular dynamics simulations, we study the structure, hydrogen bonding interaction, hydrophobic interaction and molecular aggregation in dimethyl sulfoxide (DMSO) aqueous solutions with different concentrations. In the mixture of low DMSO concentration (x(DMSO) <= 0.30), local tetrahedral structure of water is well preserved in the presence of DMSO molecules. DMSO molecules tend to associate with each other by methyl-methyl interaction. Cluster analysis shows that as concentration increases, spanning water cluster gradually breaks up and spanning DMSO cluster gradually forms. A bipercolation region is found in the molar fraction range (0.14-0.33), which is responsible for the nonideal behavior of self-diffusion of the compositions in the mixture. The present work highlights the hydrogen bonding water network and the hydrophobic DMSO network in the DMSO/water binary mixtures. (c) 2013 Published by Elsevier B.V.