PREDICTION OF CONTACT ANGLES ON THE BASIS OF THE FRUMKIN-DERJAGUIN APPROACH
PREDICTION OF CONTACT ANGLES ON THE BASIS OF THE FRUMKIN-DERJAGUIN APPROACH
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DOI：
10.1016/0001-8686(95)00257-q
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发表时间：
1995-11-10
影响因子：
15.6
通讯作者：
SOBOLEV, VD
中科院分区：
文献类型：
--
作者：
CHURAEV, NV;SOBOLEV, VD
采用Frumkin-Derjaguin方法根据湿膜分离压力等温线计算接触角。考虑分子斥力、静电引力和结构力，计算了石英表面低浓度电解质水溶液的接触角。在排斥性结构力的主导作用下，可以获得高度的表面亲水性。大的接触角是由疏水引力和/或静电引力的主要作用引起的，静电引力作用于两个带相反电荷的膜界面之间。在中等亲水性下，在10-15度到50-60度的接触角范围内，只考虑分子力和静电力就足够了。这就决定了DLVO理论的适用范围。在湿膜和两个疏水表面之间的水夹层中，近程疏水力的参数似乎是相同的。
The Frumkin-Derjaguin approach was used for the calculation of contact angles on the basis of isotherms of disjoining pressure of wetting films. The contact angles are calculated for aqueous solutions of electrolytes of low concentration on quartz surface, taking into account forces of molecular repulsion, electrostatic attraction and structural forces. A high degree of surface hydrophilicity may be attained under the predominant action of repulsive structural forces. Large contact angles are caused by the predominant action of hydrophobic attraction forces and/or electrostatic attraction forces acting between two oppositely charged film interfaces. At a moderate degree of hydrophilicity, in the range of contact angles from 10-15 degrees to 50-60 degrees, it is sufficient to take into account the molecular and electrostatic forces only. This determines the region of applicability of the DLVO theory. The parameters of the short-range hydrophobic forces seem to be the same in wetting films and in water interlayers between two hydrophobic surfaces.