Reversible stimuli-responsive nanostructures assembled from amphiphilic block copolymers

被引:72
作者
Xu, C
Fu, XF
Fryd, M
Xu, S
Wayland, BB
Winey, KI
Composto, RJ
机构
[1] Univ Penn, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA
[2] Univ Penn, Lab Res Struct Matter, Philadelphia, PA 19104 USA
[3] Univ Penn, Dept Chem, Philadelphia, PA 19104 USA
关键词
D O I
10.1021/nl052332d
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We present a novel route to assemble perpendicular cylinders by converting an asymmetric diblock copolymer from poly(styrene-b-tert-butyl acrylate) (PS-b-PtBA) to poly(styrene-b-acrylic acid) (PS-b-PAA) using an autocatalytic reaction. Upon exposure of the films of PS-b-PAA to water, PAA cylinders constrained by the continuous, glassy PS phase protrude 10 nm above the surface and swell laterally to form mushroom caps, rendering the entire surface hydrophilic. Upon annealing, the original nanostructures re-form demonstrating reversibility of swelling. Because of their stimuli-responsive behavior, these nanoscale materials are excellent candidates for sensors and microfluidic applications.
引用
收藏
页码:282 / 287
页数:6
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