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    Phase Behaviors of Giant Surfactants with Different Numbers of Fluorinated Polyhedral Oligomeric Silsesquioxane Heads and One Poly(ethylene oxide) Tail at the Air-Water Interface

    Year: 2021

    Journal: Langmuir, Volume 37, SEP 21, page 11084–11092

    Authors: Xu, Xian; Shao, Yu; Wang, Weijie; Liao, Jianwen; Liu, Hao; Zhang, Wei; Zhang, Wen-Bin; Yang, Shuguang

    Organizations: Research Fund Program of Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices [2019B121203003]

    Giant surfactants with different numbers of aryltrifluorovinyl ether-functionalized polyhedral oligomeric silsesquioxane (FVPOSS) heads and one poly(ethylene oxide) (PEO) tail, (FVPOSS)(n)-PEO227, are precisely synthesized. The phase behaviors of (FVPOSS)(n)-PEO227 at the air-water interface were investigated through surface pressure measurements (isotherm and hysteresis experiments) and the Brewster angle microscopy. Upon increasing the number of FVPOSS heads, the interfacial behaviors of these giant surfactants greatly change. More phase transitions occur during the compression as the number of FVPOSS heads increased from one to two and three. The evolution of morphologies of Langmuir films and compression-expansion hysteresis curves further illustrate phase transitions at the airwater interface. Furthermore, molecular mechanisms to describe phase transitions of (FVPOSS)(n)-PEO227 at the interface are put forward. This study deepens the understanding of interfacial phase behaviors of special giant surfactants and provides knowledge of nanostructure design and construction at the interface.
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