Self-Assembling Semicrystalline Polymer into Highly Ordered, Microscopic Concentric Rings by Evaporation
详细信息    查看全文
  • 作者:Myunghwan Byun ; Suck Won Hong ; Lei Zhu ; Zhiqun Lin
  • 刊名:Langmuir
  • 出版年:2008
  • 出版时间:April 1, 2008
  • 年:2008
  • 卷:24
  • 期:7
  • 页码:3525 - 3531
  • 全文大小:1117K
  • 年卷期:v.24,no.7(April 1, 2008)
  • ISSN:1520-5827
文摘
A drop of semicrystalline polymer, poly(ethylene oxide) (PEO), solution was placed in a restricted geometryconsisting of a sphere on a flat substrate (i.e., sphere-on-flat geometry). Upon solvent evaporation from the sphere-on-flat geometry, microscopic concentric rings of PEO with appropriate high molecular weight were produced viacontrolled, repetitive pinning ("stick") and depinning ("slip") cycles of the contact line. The evaporation-inducedconcentric rings of PEO exhibited a fibrillar-like surface morphology. Subsequent isothermal crystallization of ringsat 40 and 58 C led to the formation of multilayer of flat-on lamellae (i.e., spiral morphology). In between adjacentspirals, depletion zones were developed during crystallization, as revealed by AFM measurements. The present highlyordered, concentric PEO rings may serve as a platform to study cell adhesion and motility, neuron guidance, cellmechanotransduction, and other biological processes.

© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号

地址:北京市海淀区学院路29号 邮编:100083

电话:办公室:(+86 10)66554848;文献借阅、咨询服务、科技查新:66554700