Chiral nematic suspensions of cellulose crystallites; phase separation and magnetic field orientation
作者:
Jean-François Revol,
Louis Godbout,
Xue-Min Dong,
DerekG. Gray,
Henri Chanzy,
Georg Maret,
期刊:
Liquid Crystals
(Taylor Available online 1994)
卷期:
Volume 16,
issue 1
页码: 127-134
ISSN:0267-8292
年代: 1994
DOI:10.1080/02678299408036525
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Suspensions of rod-like cellulose crystallites of axial ratio ≈ 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.
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