Progress in coagulation rate measurements of colloidal dispersions

	Progress in coagulation rate measurements of colloidal dispersions
	Xu SH(徐升华); Sun ZW(孙祉伟)
刊名	Soft Matter
	2011
通讯作者邮箱	sunzw@imech.ac.cn
卷号	7 期号:24 页码:11298-11308
关键词	Dynamic Light-Scattering Heteroaggregation Rate Constants Collision Efficiency Factor Aggregation Rate Constants Turbidity Measurement Cross-Sections Microscopic Approach Polystyrene Latex Optical Tweezers Particle Dimers
ISSN号	1744-683X
通讯作者	Sun, ZW (reprint author), Chinese Acad Sci, Key Lab Micrograv, Inst Mech, Beijing 100190, Peoples R China
产权排序	[Xu, Shenghua; Sun, Zhiwei] Chinese Acad Sci, Key Lab Micrograv, Inst Mech, Beijing 100190, Peoples R China; [Xu, Shenghua; Sun, Zhiwei] Chinese Acad Sci, Natl Micrograv Lab, Inst Mech, Beijing 100190, Peoples R China
中文摘要	This article reviews recent advances in coagulation rate measurements of colloidal dispersions, with emphasis on the turbidity method. For turbidity method, measurement of the coagulation rate relies upon the turbidity change resulting from the coagulation process, and the measuring sensitivity significantly depends on particle size and the wavelength used. There exists a "zero sensitivity" blind point for measurement at a specific wavelength, suggesting that such measurements should be performed at a wavelength some distance from the blind point. The major difficulty in determining absolute coagulation rate constant (CRC) by light scattering and turbidity measurements is how to theoretically solve the scattering problem of 2-particle aggregates. The T-matrix method accurately solves this problem, showing its superiority over various earlier theoretical approximations (applicable only to small particles). Results from studies on effects of forward scattering, multiple scattering, etc., provide guidelines for choosing proper particle size and volume fraction for the allowed margin of measurement error. Most of these findings on turbidity methods are also valid or applicable to other scattering methods. Finally, we introduce a new microscopic approach to assess the colloidal stability at individual particle levels, by means of directly observing artificially induced collision with the aid of optical tweezers.
学科主题	Chemistry; Materials Science; Physics; Polymer Science
分类号	一类
类目[WOS]	Chemistry, Physical ; Materials Science, Multidisciplinary ; Physics, Multidisciplinary ; Polymer Science
研究领域[WOS]	Chemistry ; Materials Science ; Physics ; Polymer Science
关键词[WOS]	DYNAMIC LIGHT-SCATTERING ; HETEROAGGREGATION RATE CONSTANTS ; COLLISION EFFICIENCY FACTOR ; AGGREGATION RATE CONSTANTS ; TURBIDITY MEASUREMENT ; CROSS-SECTIONS ; MICROSCOPIC APPROACH ; POLYSTYRENE LATEX ; OPTICAL TWEEZERS ; PARTICLE DIMERS
收录类别	SCI ; EI
资助信息	We thank Mr Michael R. Honig for his help in editing this manuscript. This work is supported by Grants 10972217, 10932012 and 11032011 from the National Natural Science Foundation of China.
原文出处	http://dx.doi.org/10.1039/c1sm06237a
语种	英语
WOS记录号	WOS:000297425700002
公开日期	2012-04-01
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/45107]
专题	力学研究所_国家微重力实验室
推荐引用方式 GB/T 7714	Xu SH,Sun ZW. Progress in coagulation rate measurements of colloidal dispersions[J]. Soft Matter,2011,7(24):11298-11308.
APA	Xu SH,&Sun ZW.(2011).Progress in coagulation rate measurements of colloidal dispersions.Soft Matter,7(24),11298-11308.
MLA	Xu SH,et al."Progress in coagulation rate measurements of colloidal dispersions".Soft Matter 7.24(2011):11298-11308.