Flocculation of Deformable Emulsion Droplets: II. Interaction Energy
Flocculation of Deformable Emulsion Droplets: II. Interaction Energy
复制标题
可变形乳液液滴的絮凝：II．
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
P. Kralchevsky
中科院分区：
文献类型：
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作者：
D. Petsev;N. Denkov;P. Kralchevsky
考察了不同因素（液滴半径、界面张力、Hamaker常数、电解质、胶束浓度等）对膜分离的影响。从理论上研究了乳化液滴相互作用能的影响。结果表明，碰撞液滴的变形显著影响相互作用能。的静电，货车的德瓦尔斯，耗尽，空间位阻和振荡的表面力，以及表面拉伸和弯曲能的贡献，估计和讨论。计算结果表明，液滴的相互作用作为非变形的球体时，吸引力弱。在较强的吸引力下，液滴之间形成平衡平面平行膜，对应于系统的最小相互作用能。对于浓缩胶束表面活性剂溶液中的液滴，振荡表面力变得有效，并且可以观察到能量表面的几个最小值，每个最小值对应于在液滴之间形成的膜内具有不同数量的胶束层的亚稳态。目前的理论分析可以找到应用在预测细乳液（包含微米和亚微米液滴）的行为和稳定性，以及在解释所获得的数据通过光散射，相行为，流变学和渗透压测量等。
The effect of different factors (drop radius, interfacial tension, Hamaker constant, electrolyte, micellar concentrations, etc.) on the interaction energy of emulsion droplets is studied theoretically. It is demonstrated that the deformation of the colliding droplets considerably affects the interaction energy. The contributions of the electrostatic, van der Waals, depletion, steric, and oscillatory surface forces, as well as of the surface stretching and bending energies, are estimated and discussed. The calculations show that the droplets interact as nondeformed spheres when the attractive interactions are weak. At stronger attractions an equilibrium plane parallel film is formed between the droplets, corresponding to minimum interaction energy of the system. For droplets in concentrated micellar surfactant solutions the oscillatory surface forces become operative and one can observe several minima of the energy surface, each corresponding to a metastable state with a different number of micellar layers inside the film formed between the droplets. The present theoretical analysis can find applications in predicting the behavior and stability of miniemulsions (containing micrometer and submicrometer droplets), as well as in interpretation of data obtained by light scattering, phase behavior, rheological and osmotic pressure measurements, etc.