首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Dichroism measurements in forensic fibre examination: Part 3 — Dyed cotton and viscose fibres
Authors:K De Wael  L Lepot
Institution:aNational Institute for Criminalistics and Criminology, Fibres & Textiles Laboratory, Vilvoordsesteenweg 100, 1120 Brussels, Belgium
Abstract:A number of dyed cellulosic fibres were examined with plane polarized light on their dichroic behavior by microscopy and microspectrophotometry (MSP-PPL). Significant dichroic effects (mostly hypochromic effects and hypsochromic bands shifts) were reported. The effect is related to the chemical structure: some dye structures always possess dichroism (azo, stilbene, thiazole and oxazine), some dyes demonstrate sometimes dichroic effects (anthraquinoid, indigoid) while other structures never demonstrate dichroic effects (sulphur, diphenylmethanes, triarylmethanes, phthalocyanines). In some cases a different dichroic behavior was found for the same dyes applied on cotton and on viscose.
Keywords:Dichroism  Cotton  Viscose  Polarized light  Microspectrophotometry (MSP)  Fibre examination
本文献已被 ScienceDirect PubMed 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号