Toward an understanding of the turbidity measurement of fleterocoagulation rate constants of dispersions containing particles of different sizes

doi:10.1021/la701426u

IMECH-IR > 力学所知识产出(1956-2008)

	Toward an understanding of the turbidity measurement of fleterocoagulation rate constants of dispersions containing particles of different sizes
	Liu J(刘捷); Xu SH(徐升华); Sun ZW(孙祉伟); Sun, ZW (reprint author), Chinese Acad Sci, Inst Mech, Beijing 100080, Peoples R China.
发表期刊	Langmuir
	2007
卷号	23 期号:23 页码:11451-11457
ISSN	0743-7463
摘要	Our previous studies have shown that the determination of coagulation rate constants by turbidity measurement becomes impossible for a certain operating wavelength (that is, its blind point) because at this wavelength the change in the turbidity of a dispersion completely loses its response to the coagulation process. Therefore, performing the turbidity measurement in the wavelength range near the blind point should be avoided. In this article, we demonstrate that the turbidity measurement of the rate constant for coagulation of a binary dispersion containing particles of two different sizes (heterocoagulation) presents special difficulties because the blind point shifts with not only particle size but also with the component fraction. Some important aspects of the turbidity measurement for the heterocoagulation rate constant are discussed and experimentally tested. It is emphasized that the T-matrix method can be used to correctly evaluate extinction cross sections of doublets formed during the heterocoagulation process, which is the key data determining the rate constant from the turbidity measurement, and choosing the appropriate operating wavelength and component fraction are important to achieving a more accurate rate constant. Finally, a simple scheme in experimentally determining the sensitivity of the turbidity changes with coagulation over a wavelength range is proposed.
关键词	Heteroaggregation Rate Constants Dynamic Light-scattering Polymer Colloids Heterocoagulation Coagulation Homocoagulation Aggregation Stability Kinetics Latex
DOI	10.1021/la701426u
收录类别	SCI
语种	英语
WOS记录号	WOS:000250584500024
关键词[WOS]	HETEROAGGREGATION RATE CONSTANTS ; DYNAMIC LIGHT-SCATTERING ; POLYMER COLLOIDS ; HETEROCOAGULATION ; COAGULATION ; HOMOCOAGULATION ; AGGREGATION ; STABILITY ; KINETICS ; LATEX
WOS研究方向	Chemistry ; Materials Science
WOS类目	Chemistry, Multidisciplinary ; Chemistry, Physical ; Materials Science, Multidisciplinary
引用统计	被引频次：18[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/33875
专题	力学所知识产出(1956-2008)
通讯作者	Sun, ZW (reprint author), Chinese Acad Sci, Inst Mech, Beijing 100080, Peoples R China.
推荐引用方式 GB/T 7714	Liu J,Xu SH,Sun ZW,et al. Toward an understanding of the turbidity measurement of fleterocoagulation rate constants of dispersions containing particles of different sizes[J]. Langmuir,2007,23,23,:11451-11457.
APA	刘捷,徐升华,孙祉伟,&Sun, ZW .(2007).Toward an understanding of the turbidity measurement of fleterocoagulation rate constants of dispersions containing particles of different sizes.Langmuir,23(23),11451-11457.
MLA	刘捷,et al."Toward an understanding of the turbidity measurement of fleterocoagulation rate constants of dispersions containing particles of different sizes".Langmuir 23.23(2007):11451-11457.

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