Observation of novel liquid-crystalline phase above the bulk-melting temperature

被引：23

作者：

Gautam, KS

Kumar, S

Wermeille, D

Robinson, D

Dhinojwala, A ^{[1
]}

机构：

[1] Univ Akron, Dept Polymer Sci, Akron, OH 44325 USA

[2] Kent State Univ, Dept Phys, Kent, OH 44240 USA

[3] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[4] Argonne Natl Lab, Chicago, IL 60439 USA

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 21期

关键词：

D O I：

10.1103/PhysRevLett.90.215501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In this paper, we show that a noncrystalline but ordered smectic-like phase exists above the bulk-melting temperature (T-m) at poly(n-alkyl acrylates)-air interface. The surface ordered phase is one monolayer thick and undergoes a sharp transition from order to disorder 10degreesC above T-m for n=22. The presence of a surface phase that does not exist in the bulk has important implications in the design of thermally responsive adhesives.

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