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报道了直接测定楔压等温线的方法，研究了阳离子表面活性剂TTAB在浓度大于CMC时，液膜的平衡厚度与楔压的关系，以及膜表面张力与溶液表面张力之间的差别。结果显示，在低楔压时，膜厚随楔压增加而变薄，在高楔压时，随着楔压的增加，膜厚变化很小。由楔压等温线得出的膜表面张力的结果说明了一般黑膜的表面张力数值与溶液的表面张力并没有明显的差别。
The method of direct determination of wedge pressure isotherms was reported. The relationship between the equilibrium thickness of liquid film and wedge pressure and the difference between surface tension and solution surface tension were studied when the cationic surfactant TTAB was greater than CMC. The results show that at low wedge pressures, the film thickness decreases with increasing wedge pressure. At high wedge pressures, the film thickness changes little with wedge pressure increasing. The results of the surface tension of the film obtained from the wedge pressure isotherms show that there is no significant difference between the surface tension values of the general black film and the surface tension of the solution.