Adsorption and morphology transition of surfactants on hydrophobic surfaces: A lattice Monte Carlo study

作者：Zheng Fengxian; Zhang Xianren^*; Wang Wenchuan; Dong Wei

来源：Langmuir, 2006, 22(26): 11214-11223.

DOI：10.1021/la0622424

In this work, we first show that there are only five independent interchange parameters in the surfactant-solvent-interface system in Larson's model, and then adsorption and morphology transition of surfactants on hydrophobic surfaces are studied by extensive lattice Monte Carlo simulations. In our simulations, we found that there exist six adsorbed morphologies: (1) premature admicelle, (2) hemisphere, (3) hemisphere-hemicylinder mixture, (4) wormlike hemicylinder, (5) perforated monolayer, and (6) monolayer. The surface morphologies and the amount of adsorption on hydrophobic surfaces are found to be affected obviously by two interchange parameters. One is the attractive interaction between tail groups and surface (chi(TS)), and the other is the solubility of head groups in bulk (chi(HW)). Phase diagrams in chi(HW) versus chi(TS) planes for surfactants with different hydrophobicities (chi(TW)) and for surfactants with different molecular structures are determined in this work, from which the transitions of surface morphologies and adsorption behaviors are discussed.

• 出版日期2006-12-19
• 单位北京化工大学