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arXiv 0810.1618cond-mat.soft
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无添加剂的油包水乳液的稳定性

Stability of additive-free water-in-oil emulsions

Jos Zwanikken, Joost de Graaf, Markus Bier, René van Roij

摘要:

本文利用非线性Poisson-Boltzmann理论计算了平面油水界面附近的离子分布,并考虑了两种介质中离子的玻恩自能。对于不平等的自我能量的阳离子和阴离子,发现一个自发的电荷分离,使水和油相成为相反的电荷,在平板具有典型厚度的德拜屏蔽长度在两种介质。从解析解,相应的界面电荷密度和界面张力的贡献,推导出,连同两个球形水滴在油中的Yukawa电位的估计。探索的参数制度等离子体耦合参数超过结晶阈值,即液滴预计形成晶体结构,由于一个强大的汤川排斥,最近观察到的实验。扩展的理论,我们简要地讨论包括数值计算的球形水滴在油中,和分析计算的线性PB-方程有限的油-水界面宽度。

英文摘要:

We calculate ion distributions near a planar oil-water interface within non-linear Poisson-Boltzmann theory, taking into account the Born self-energy of the ions in the two media. For unequal self-energies of cations and anions, a spontaneous charge separation is found such that the water and oil phase become oppositely charged, in slabs with a typical thickness of the Debye screening length in the two media. From the analytical solutions, the corresponding interfacial charge density and the contribution to the interfacial tension is derived, together with an estimate for the Yukawa-potential between two spherical water droplets in oil. The parameter regime is explored where the plasma coupling parameter exceeds the crystallization threshold, i.e. where the droplets are expected to form crystalline structures due to a strong Yukawa repulsion, as recently observed experimentally. Extensions of the theory that we discuss briefly include numerical calculations on spherical water droplets in oil, and analytical calculations of the linear PB-equation for a finite oil-water interfacial width.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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