Department of Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong.
Macromol Rapid Commun. 2013 Dec;34(23-24):1850-5. doi: 10.1002/marc.201300702. Epub 2013 Nov 19.
Hybrid cylindrical micelles loaded with nanoparticles are fabricated via extrusion of spherical micelles in solution phase through small long cylindrical pores. Small gold nanoparticles (AuNPs) are pre-coated with thiol-terminated polystyrene and then further encapsulated in the core part of block copolymer spherical micelles by a precipitation method. By varying the starting mass ratio of AuNPs and the diblock copolymers polystyrene-b-polyisoprene (PS-b-PI) during the encapsulation, the AuNPs loading density along the cylindrical micelles can be controlled. The mechanism for this sphere-to-cylinder transition induced by extruding hybrid spherical micelles through small cylindrical nanopores is discussed. These findings provide a novel way to manufacture high-quality and functional polymeric nano-wires, which may open the door to new applications such as in plasmonic waveguides.
通过在溶液相中从小长圆柱形孔中挤压球形胶束来制备负载纳米颗粒的混合圆柱形胶束。小的金纳米粒子（AuNPs）预先用巯基封端的聚苯乙烯包覆，然后通过沉淀法进一步包封在嵌段共聚物球形胶束的芯部。通过在封装过程中改变 AuNPs 和两亲嵌段共聚物聚苯乙烯-b-聚异戊二烯（PS-b-PI）的起始质量比，可以控制沿圆柱形胶束的 AuNPs 装载密度。讨论了通过从小圆柱形纳米孔中挤出混合球形胶束诱导的这种球到圆柱的转变的机制。这些发现为制造高质量和功能性聚合物纳米线提供了一种新方法，这可能为等离子导波等新应用开辟道路。
