通过石英晶体微天平研究聚合物胶束和囊泡在表面的吸附。

Adsorption of polymeric micelles and vesicles on a surface investigated by quartz crystal microbalance.

作者信息

Yan Yunfeng, Zhou Xuechang, Ji Jing, Yan Lifeng, Zhang Guangzhao

机构信息

Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui, China.

出版信息

J Phys Chem B. 2006 Oct 26;110(42):21055-9. doi: 10.1021/jp064273d.

DOI:10.1021/jp064273d

PMID:17048925

Abstract

Polystyrene-b-poly(N-isopropylacrylamide) (PS-b-PNIPAM) diblock copolymers either with or without thiol end groups, depending on the relative length of the two blocks, form micelles or vesicles in water. The adsorption of such micelles or vesicles on a gold surface from aqueous solution was investigated in situ at 20 degrees C by use of a quartz crystal microbalance with dissipation monitoring (QCM-D). The changes in frequency (Deltaf) and dissipation (DeltaD) revealed that the micelles and vesicles without thiol groups were intact with some deformation when they were deposited on the surface. On the other hand, the micelles and vesicles with thiol groups at the end of PNIPAM blocks would transform into trilayers due to the strong interaction between thiols and gold surface.

摘要

聚苯乙烯-b-聚（N-异丙基丙烯酰胺）（PS-b-PNIPAM）二嵌段共聚物，根据两个嵌段的相对长度，带有或不带有硫醇端基，在水中形成胶束或囊泡。使用具有耗散监测功能的石英晶体微天平（QCM-D），在20℃下从水溶液中原位研究了此类胶束或囊泡在金表面的吸附。频率（Δf）和耗散（ΔD）的变化表明，没有硫醇基团的胶束和囊泡在沉积到表面时会发生一些变形但仍保持完整。另一方面，在PNIPAM嵌段末端带有硫醇基团的胶束和囊泡，由于硫醇与金表面之间的强相互作用，会转变为三层结构。