Self-Assembling Semicrystalline Polymer into Highly Ordered, Microscopic Concentric Rings by Evaporation
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- 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.
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.