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Effect of Inorganic Salts on the Aggregation Behavior of AOT at the Air/Water Interface
Author(s) -
Pang Jinyu,
Zhao Taotao,
Xin Xia,
Chen Yijian,
Tan Yebang,
Xu Guiying
Publication year - 2016
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-016-1842-7
Subject(s) - chemistry , divalent , counterion , ion , sodium , monolayer , molecule , inorganic chemistry , diffusion , organic chemistry , thermodynamics , biochemistry , physics
The aggregation behavior of sodium bis‐(2‐ethylhexyl)‐sulfosuccinate (AOT) at the air/water interface in the absence and presence of inorganic salts was investigated by molecular dynamics simulation. Both monovalent and divalent ions were studied, such as LiCl, NaCl, KCl, MgCl 2 and CaCl 2 . It has been proved that these inorganic ions have great influence on the structure of the AOT monolayer and water molecules around its headgroup. In the presence of inorganic salts, AOT molecules are relatively ordered at the interface and water around the headgroups of AOT shows a lower diffusion coefficient compared with the situation without inorganic salts. All the counterions are prone to move toward the headgroups and locate at the interface. Divalent ions have a strong interaction with AOT, thus they affect the aggregation behavior of AOT remarkably.