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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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