Chemical Research in Chinese Universities ›› 2016, Vol. 32 ›› Issue (1): 100-105.doi: 10.1007/s40242-016-5297-1

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Measurement and Prediction on the Surface Properties of Dimethyl Sulfoxide/Water Mixtures

LÜ Ping, ZHAO Guanjia, ZHANG Xiaolong, YIN Jianguo, BAO Junfeng   

  1. College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China
  • Received:2015-07-22 Revised:2015-10-23 Online:2016-02-01 Published:2015-11-13
  • Contact: ZHAO Guanjia E-mail:xjtuthermo@foxmail.com
  • Supported by:

    Supported by the Specialized Research Fund for the National Natural Science Foundation of China(Nos.51506140, 51306127) and the Research Funds from Taiyuan University of Technology, China.

Abstract:

Pendent drop method was adopted to measure the surface tension of dimethyl sulfoxide(DMSO)/water mixtures. A new pendent drop apparatus was built up and checked with water, and a good agreement of our data with literature could be found. With the new apparatus, the surface tensions of nine DMSO/water mixtures with mass fractions of water from 0.1 to 0.9 were investigated in a temperature range of 298-338 K. The expanded uncertainty for surface tension measurement was estimated to be 0.5% at a confidence level of 95%(k=2) in the whole temperature range. A thermodynamic-based relation was used to predict the surface properties of DMSO/water mixtures. Based on the relation and Gibbs adsorption theory, a prediction model was proposed for the calculation of surface relative excess and the thickness of the surface molecule layer.

Key words: Surface tension, Pendent drop, Dimethyl sulfoxide, Water