High-temperature measurements of static surface tensions by optical imaging of the liquid/gas interface inside a tapered micropipette which was placed within a microcapillary, were achieved by coating an electrically conductive, transparent, tin-doped indium oxide (ITO) thin film as a heating jacket on the outer surface of the microcapillary. The precision of this video microscopic technique was discussed by measuring static surface tensions of water, n-hexadecane, and n-decane at various temperatures, and the range achieved in the experiments was from 25 �C to 110 �C for n-decane and 25 �C to 200 �C for n-hexadecane. The experimental set up was further used for determining temperature-change induced dynamic surface tension, and for analyzing the effects of different factors on the dependence of surface tension on temperature and time.

Video microscopic measurement of static and dynamic surface tension at high temperatures

245th National Meeting (2013)

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