期刊
MOLECULAR PHYSICS
卷 111, 期 1, 页码 135-146出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/00268976.2012.707692
关键词
water-DMSO mixture; self-diffusion coefficients; orientational relaxation times; hydrogen bonds structural relaxation times
资金
- CSIR [01 (2352)/09 EMR-II]
The effects of pressure on the single-particle translational and rotational dynamics and the hydrogen-bond structural relaxation of waterdimethyl sulfoxide (DMSO) mixtures were investigated under ambient and cold conditions using classical molecular dynamics simulations. We considered five different concentrations of DMSO with mole fractions X DMSO?=?0.012, 0.09, 0.20, 0.35, and 0.50 and seven different pressures ranging from 0.1 to 500?MPa. It was found that the addition of DMSO to water leads to slow dynamics for both water and DMSO molecules under pressure. At very low concentrations of DMSO, water exhibits anomalous behavior with the application of pressure at 258?K, whereas DMSO molecules exhibit average pressure dependencies. The formation of strong hydrogen bonds between water and DMSO molecules occurs when DMSO is added to water, but the extended network is altered due to the absence of any hydrogen-bond donating ability of DMSO. Our calculated waterwater and DMSOwater hydrogen-bond structural relaxation times show an initial decrease with the application of pressure at 258?K for solutions with low DMSO concentrations. However, at higher concentrations of DMSO, the relaxation times increase, on average, and no anomalous behavior of the dynamical properties is found on the application of pressure.
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