A Microscopic Approach to Studying Colloidal Stability

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	A Microscopic Approach to Studying Colloidal Stability
	Sun ZW(孙祉伟); Xu SH(徐升华); Dai GL(戴国亮); Li YM; Lou LR; Liu QS(刘秋生); Zhu RC(朱如曾)
刊名	Journal of Chemical Physics
	2003
卷号	119 期号:4 页码:2399－2405
ISSN号	0021-9606
通讯作者	Sun, Z (reprint author), Chinese Acad Sci, Inst Mech, Natl Micrograv Lab, Beijing 100080, Peoples R China.
中文摘要	A novel approach to the investigation of colloidal aggregation in experiments performed at microscopic particle levels by means of artificially induced particle collisions with the aid of optical tweezers is proposed. A physical model describing the artificially induced collisions was suggested. The stability ratios for different electrolyte concentrations (NaCI) are estimated by dividing the total number of particle collisions by the number of collisions leading to permanent doublets. The experimental results under different electrolyte concentrations are compared with zeta potentials and turbidity measurements. In regards to fully dispersed or rapid-coagulated systems, this approach can conveniently provide an accurate judgment of the system's stability. For general slow-coagulated systems, when the stability ratio is greater than 1.8, our data are in agreement with those obtained from the turbidity measurements. When the stability ratio is less than 1.8, the accuracy of the approach is limited due to the possibility of the imprecise control of the short duration during which the particle pair is held in the optical trap for the induced collisions.
学科主题	力学
类目[WOS]	Physics, Atomic, Molecular & Chemical
研究领域[WOS]	Physics
关键词[WOS]	COLLISION EFFICIENCY FACTOR ; POLYSTYRENE LATEX ; LIGHT-SCATTERING ; COAGULATION ; PARTICLES ; DISPERSIONS ; FLOW
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000184103000063
公开日期	2007-06-15 ; 2007-12-05 ; 2009-06-23
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/15577]
专题	力学研究所_力学所知识产出(1956-2008)
推荐引用方式 GB/T 7714	Sun ZW,Xu SH,Dai GL,et al. A Microscopic Approach to Studying Colloidal Stability[J]. Journal of Chemical Physics,2003,119(4):2399－2405.
APA	孙祉伟.,徐升华.,戴国亮.,Li YM.,Lou LR.,...&朱如曾.(2003).A Microscopic Approach to Studying Colloidal Stability.Journal of Chemical Physics,119(4),2399－2405.
MLA	孙祉伟,et al."A Microscopic Approach to Studying Colloidal Stability".Journal of Chemical Physics 119.4(2003):2399－2405.