"Micro-Pottery"-Marangoni Effect Driven Assembly of Amphiphilic Fibers

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• 作者：Janhavi S. Raut ; Pradeep Bhattad ; Aditi C. Kulkarni ; and Vijay M. Naik
• 刊名：Langmuir
• 出版年：2005
• 出版时间：January 18, 2005
• 年：2005
• 卷：21
• 期：2
• 页码：516 - 519
• 全文大小：651K
• 年卷期：v.21,no.2(January 18, 2005)
• ISSN：1520-5827

文摘

We report spontaneous supra-assembly of fibrous surfactant crystallites at the air-solution interfaceresulting in spectacular arrays of two-dimensional spiral and three-dimensional "micro-pottery"-likesuperstructures. Surface pressure differential driven bending of the embryonic fiber nuclei and Marangoniconvection driven fiber migration/alignment appear to be the causal factors behind this phenomenon. Theassemblies form at specific crystal-growth velocities dictated by the relative time scales for fiber bending/alignment and their rigidification/immobilization as they grow. Although our studies are restricted to aspecific class of amphiphiles, namely, alkaline metal salts of linear fatty acids, the phenomenon shouldbe generic to amphiphilic molecules that crystallize into flexible fibers.