title: Self-assembly of gold nanoparticles and polystyrene: a highly versatile approach to the preparation of colloidal particles with polystyrene cores and gold nanoparticle coronae.
abstract: Colloidal particles with polystyrene (PS) cores and gold nanoparticle (AuNP) coronae were prepared on the basis of the self-assembly of AuNP's and PS. Citrate-stabilized AuNP's were dispersed in aqueous solution, and PS with thiol terminal groups (PS-SH) was dissolved in toluene. A stable emulsion was obtained by mixing the two solutions. Optical microscope images indicate that after grafting of PS-SH to the citrate-stabilized AuNP's at liquid-liquid interface, the interfacial tension is reduced and the average size of toluene droplets in the emulsion decreases. Transmission electron microscope (TEM) results also prove the grafting of PS-SH to AuNP's and the location of the hybrid nanoparticles at the liquid-liquid interface. Colloidal particles with PS cores and AuNP coronae were prepared by adding the emulsion to excess methanol. The weight ratio of PS-SH to AuNP exerts a significant effect on the size of colloidal particles. TEM and dynamic light scattering results both indicate that the size of colloidal particles increases with the weight ratio. The application of the core-shell-structured colloidal particles to protein separation was also investigated in this research. Colloidal particles with PS-coated magnetic nanoparticles in the cores were also prepared by this strategy.
authors.affiliation: Key Laboratory of Functional Polymer Materials, Ministry of Education, Department of Chemistry, Nankai University, Tianjin 300071, People's Republic of China.
authors.forename: Jia
authors.initials: J
authors.lastname: Tian
authors.forename: Jie
authors.initials: J
authors.lastname: Jin
authors.forename: Fan
authors.initials: F
authors.lastname: Zheng
authors.forename: Hanying
authors.initials: H
authors.lastname: Zhao
mesh_terms: D000327:Adsorption; D003102:Colloids; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles; D046529:Microscopy, Electron, Transmission; D011137:Polystyrenes / Q000737:chemistry*; D011506:Proteins / Q000737:chemistry
chemical_list: D003102:Colloids; D011137:Polystyrenes; D011506:Proteins; D006046:Gold