Self-assembly of the surfactant mixtures on graphene in the presence of electrolyte: a molecular simulation study

摘要: The insolubility of graphene nanosheets in aqueous media has been a limitation for the practical applications this unique material. non-covalent functionalization with mixed surfactants is an effective procedure preparation stable dispersions. Physical adsorption onto surfaces significant stage dispersion environment. Studies have shown that presence electrolyte greatly affects process pure on solid surfaces. Examination will help to better understand mechanism molecular interactions between and surfactants. Therefore, study, we used dynamics simulations investigate study morphology assemblies formed from graphene. We effects concentration surface coverage surfactants' mixture structural changes nanosheets. found increasing ionic strength reinforces stretching adsorbed toward phase, leads clear volume expansion structure graphene-surfactant hemi-spherical micelles. In fact, screening effect ions electrostatic repulsion charged head-groups made molecules approach each other, leading more compact assembly surface. As micelles surfactants-graphene expanded, steric these also increased, which turn, inhibited re-aggregation sheets covered