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The modified van der Waals theory of interfaces (gradient theory) is used with the equations of state of Peng‐Robinson and Mohanty‐Davis to predict surface tensions of various nonpolar, quadrupolar, slightly polar and polar substances as a function of temperature. The influence parameter of the gradient theory is estimated as 0.785ab 2/3 in terms of the attractive and repulsive van der Waals parameters using the Lennard‐Jones potential. The predictions made with the Mohanty‐Davis equation of state agree better with experimental data than those made with Peng‐Robinson, even for nonpolar fluids.
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Pérez‐López et al. (1992) studied this question.
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