中国科学院重庆绿色智能技术研究院机构知识库

QQ客服 官方微博 反馈留言

	Determination of Critical Micelle Concentrations of Surfactants by Terahertz Time-Domain Spectroscopy
	Yan, Shihan1; Wei, Dongshan1; Tang, Mingjie1; Shi, Changcheng1; Zhang, Mingkun1; Yang, Zhongbo1; Du, Chunlei1; Cui, Hong-Liang1,2
	2016-07-01
摘要	A novel detection method is presented to determine the critical micelle concentrations (CMCs) of surfactants by using a simple and convenient terahertz time-domain spectroscopy (THz-TDS) technology which has been successfully used to study the picosecond dynamics of water in reverse micelles. Absorption coefficients or refractive indices of aqueous solutions of an ionic surfactant sodium dodecyl sulfate and a nonionic surfactant nonaethylene glycol monododecyl ether in 0.2-1.8 THz frequency range at different concentrations are measured through the THz-TDS. A clear intersection of THz absorption coefficient or refractive index caused by the micelle formation is observed. This phenomenon is strongly associated with the change of component ratio between surfactant, bulk water and hydration water during the formation of micelles. The corresponding concentration is determined as the CMC of the surfactant which is in good agreement with the most existing results using traditional methods. For comparison, absorption coefficients of the two surfactants in hydrochloric acid solutions are also measured and differences in contrast to those in aqueous solutions are observed and explained. Our findings indicate that THz spectroscopy technology can be applied to determine the CMCs of surfactants in a sensitive, accurate, and label-free way. Index Terms-Absorption coefficient, criticalmicelle concentra-
关键词	Absorption coefficient criticalmicelle concentration (CMC) refractive index surfactant terahertz time-domain spectroscopy (THz-TDS)
DOI	10.1109/TTHZ.2016.2575450
发表期刊	IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
ISSN	2156-342X
卷号	6期号:4页码:532-540
收录类别	SCI
WOS记录号	WOS:000384913500004
语种	英语