ELECTRIC BIREFRINGENCE OF POLY(TETRAFLUOROETHYLENE) WHISKERS

被引：8

作者：

FOSTER, KR ^{[1
]}

OSBORN, AJ ^{[1
]}

WOLFE, MS ^{[1
]}

机构：

[1] DUPONT CO,WILMINGTON,DE 19880

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1992年 / 96卷 / 13期

关键词：

D O I：

10.1021/j100192a054

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The alternating-current electric birefringence was measured from 68 Hz to 6.8 MHz for suspensions of rod-like poly(tetrafluoroethylene) (PTFE) microcylinders of approximately 20-nm diameter and 0.4-mu-m length, in dilute KCl. The birefringence spectra shows a large, broad dispersion centered near 100 kHz whose amplitude is strongly dependent on thc conductivity of the medium. A simple model can account for these properties, based on a calculation of the potential energy of homogeneous ellipsoids immersed in lossy dielectric media. The model suggests that the dispersion arises from a combination of two effects: an increase with frequency in thc surface conductance of the particles and a Maxwell-Wagner effect. The estimated surface conductance of the PTFE cylinders is comparable to values previously reported for other colloidal particles in suspension.

引用

页码：5483 / 5487

页数：5

共 27 条

[1] ELECTRO-OPTIC AND RHEOLOGICAL BEHAVIOR OF AQUEOUS DISPERSIONS OF POLYTETRAFLUORETHYLENE (PTFE) FIBRILLES [J].