胶体颗粒在聚电解质多层膜表面的可控组装

利用原子力显微镜和扫描电子显微镜研究了磺化聚苯乙烯胶体颗粒在由聚二甲基二烯丙基氯化铵和聚苯乙烯磺酸钠层状自组装而成的多层膜表面的组装.该组装受表面性质影响,通过对多层膜的最外层的组装条件或利用盐溶液对多层膜进行后处理可以控制胶体颗粒在膜表面的组装密度.

Synthesis of Amphiphilic Diblock Copolymer Poly(L-alanine)-b-poly(hydroxyethyl glutamine)and Its Self-assembly in Water

Colloidal adsorption onto certain substrates is of great interest in both basic colloidal chemistry and colloidal lithography with a larger surface area. We studied the assembly of sulfonated polystyrene particles that have anionic charges on the surfaces of the polyelectrolyte multilayer(PEM) films composed of poly(diallyldimethylammonium chloride)(PDDA) and poly(sodium 4-styrenesulfonate)(PSS). The monolayer assembly of the colloid particles without three-dimensional aggregation could be observed by atomic force microscope(AFM) and scanning electron microscope(SEM), and the number of colloids adsorbed per square micrometer was varied systematically from 2 to 7 by fine-tuning the fabrication and postfabrication of PEMs. Based on an electrostatic point of view, an approaching particle is attracted by the precursor film and repulsed by adsorbed particles, the balance between the attraction and repulsion is affected by alternation of surface property of PEMs. This method can provide a fabrication way of a wide range of dotted materials in which its feature size is the diameter of colloid particles.