Late Stage of the Phase-Separation Process: Coalescence-Induced Coalescence, Gravitational Sedimentation, and Collective Evaporation Mechanisms

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• 作者：Tomasz Kalwarczyk ; Natalia Ziebacz ; Marcin Fiał ; kowski ; Robert Hoł ; yst
• 刊名：Langmuir
• 出版年：2008
• 出版时间：July 1, 2008
• 年：2008
• 卷：24
• 期：13
• 页码：6433 - 6440
• 全文大小：1450K
• 年卷期：v.24,no.13(July 1, 2008)
• ISSN：1520-5827

文摘

We study the separation in the binary and ternary mixtures of the water/surfactant C₁₂E₅/polymer PEG system. The phase separation in the mixtures at late stages is governed by two distinct mechanisms: the coalescence-induced coalescence and the droplet evaporation mechanism. We show that when the coalescence-induced coalescence process is globally terminated in the sample consisting of a dense system of domains, another mechanism, which we call the collective droplet evaporation, starts to dominate. It manifests itself as a front of “evaporating” domains, which propagates at constant speed in the system. We show that the collective evaporation is induced by the gravitational drift of large droplets.