Study of Micelle Formation by Fluorocarbon Surfactant N-(2-hydroxypropyl)perfluorooctane Amide in Aqueous Solution

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• 作者：Caili Dai ; Mingyong Du ; Mingwei Zhao ; Qing You ; Baoshan Guan ; Xin Wang ; Ping Liu
• 刊名：Journal of Physical Chemistry B
• 出版年：2013
• 出版时间：August 29, 2013
• 年：2013
• 卷：117
• 期：34
• 页码：9922-9928
• 全文大小：365K
• 年卷期：v.117,no.34(August 29, 2013)
• ISSN：1520-5207

文摘

Micelles formed by fluorocarbon surfactant N-(2-hydroxypropyl)perfluorooctane amide in aqueous solution were studied through surface tension, dynamic light scatting (DLS), isothermal titration calorimetry (ITC), and dissipative particle dynamic (DPD) simulations. Through surface tension measurements, the effectiveness of surface tension reduction, the maximum surface excess concentration, and the minimum area occupied per surfactant molecule at the air/water interface were investigated. The critical micelle concentration (cmc) at different temperatures and a series of thermodynamic parameters (螖G_m⁰, 螖H_m⁰, 螖S_m⁰, 螖G_ads⁰, 螖H_m^A and 螖C_pm⁰) of micellization were evaluated. The thermodynamic parameters showed that the micelle formation was entropy-driven. The micelle formation was also confirmed by ITC and DLS. In addition, the DPD simulations were conducted to simulate the whole process of micelle formation to make micelle formation better understood.