CHIRAL NEMATIC SUSPENSIONS OF CELLULOSE CRYSTALLITES - PHASE-SEPARATION AND MAGNETIC-FIELD ORIENTATION

被引:382
作者
REVOL, JF
GODBOUT, L
DONG, XM
GRAY, DG
CHANZY, H
MARET, G
机构
[1] PULP & PAPER RES INST CANADA,MONTREAL H3A 2A7,PQ,CANADA
[2] MCGILL UNIV,PULP & PAPER RES CTR,DEPT CHEM,MONTREAL H3A 2A7,QUEBEC,CANADA
[3] JOSEPH FOURIER UNIV,F-38041 GRENOBLE,FRANCE
[4] CNRS,CERMAV,F-38041 GRENOBLE,FRANCE
[5] MAX PLANCK INST FESTKORPERFORSCH,HOCHFELD MAGNETLAB,F-38042 GRENOBLE,FRANCE
关键词
D O I
10.1080/02678299408036525
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Suspensions of rod-like cellulose crystallites of axial ratio almost-equal-to 20 40, prepared by acid hydrolysis of natural cellulose fibres with sulphuric acid, give stable ordered fluids that display well-formed textures and disclinations characteristic of chiral nematic liquid crystalline phases. The critical volume fraction for phase separation of salt-free suspensions is typically 0.03, with a relatively narrow biphasic region. Because of the negative diamagnetic susceptibility of cellulose, the ordered phase becomes oriented in a magnetic field with its chiral nematic axis parallel to the applied field.
引用
收藏
页码:127 / 134
页数:8
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