Determination of reliable Lewis acid-base surface tension components of a solid in LW-AB approach

作者：Hwang Geelsu; Lee Chang Ha; Ahn IK Sung^*; Mhin Byung Jin

来源：Journal of Industrial and Engineering Chemistry, 2011, 17(1): 125-129.

DOI：10.1016/j.jiec.2010.12.009

• LW-AB approach
• Graphical analysis
• Surface tension components
• Contact angles

In the Lifshitz-van der Waals/Lewis acid-base (LW-AB) approach, the interaction between a solid and a liquid is described mathematically as the geometric mean of their surface tension components. The surface tension components of the solid (gamma(LW)(s), gamma(+)(s), and gamma(-)(s)) are determined by measurement of the contact angles for various liquids whose surface tension components (gamma(LW)(s), gamma(+)(l), and gamma(+)(l)) are known. One of the two AB surface tension components of a solid (gamma(+)(s), and gamma(-)(s)) is often calculated to have a negative square root. In the conventional LW-AB approach, it has been assumed to be zero, which leads to the inaccurate evaluation of not only the other surface tension component but also the total interfacial Gibbs energy. In this study, the equations expressing the relationship between solid surface tension components and liquid surface tension components were plotted for various contact angles. The plots showed that a large deviation could occur in the values of gamma(LW)(s), root gamma(+)(s), and root gamma(+)(s), depending on the type of apolar liquid. Also it was found that there could be combinations of three liquids allowing the meaningful non-negative values for root gamma(+)(s), and root gamma(+)(s).

• 出版日期2011-1-25