Influence of the surface charge on the homogeneity of colloidal crystals

	Influence of the surface charge on the homogeneity of colloidal crystals
	Zhou HW(周宏伟); Xu SH(徐升华); Ouyang WZ(欧阳文泽); Sun ZW(孙祉伟); Liu LX(刘丽霞)
刊名	JOURNAL OF CHEMICAL PHYSICS
	2013-08-14
通讯作者邮箱	xush@imech.ac.cn; sunzw@imech.ac.cn
卷号	139 期号:6 页码:064904/1-064904/7
ISSN号	0021-9606
通讯作者	Xu, SH (reprint author), Chinese Acad Sci, Inst Mech, Key Lab Micrograv, 15 Beisihuanxi Rd, Beijing 100190, Peoples R China.
产权排序	[Zhou, Hongwei; Xu, Shenghua; Ouyang, Wenze; Sun, Zhiwei; Liu, Lixia] Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Beijing 100190, Peoples R China; [Zhou, Hongwei; Xu, Shenghua; Ouyang, Wenze; Sun, Zhiwei; Liu, Lixia] Chinese Acad Sci, Inst Mech, Natl Micrograv Lab, Beijing 100190, Peoples R China
中文摘要	Five groups of suspensions composed of polystyrene particles, having similar size but different effective surface charge, were adopted to investigate the effects of surface charge and volume fraction on the homogeneity of colloidal crystals through checking the difference between D-exp and D-uni by reflection spectroscopy method (D-exp, D-uni are the experimental and the expected value of the average nearest neighbor interparticle distance by assuming a uniform structure, respectively). We found volume fractions (ranging from 0.006 to 0.02) and structure types basically have no influence on the values of D-exp/D-uni. Moreover, for crystals formed by lowly charged particles, D-exp/D-uni is approximately equal to 1, implying the crystals are homogeneous. With the increase of effective surface charge, D-exp gradually deviates from D-uni and the formed crystals become inhomogeneous. Our experimental observations are in accordance with the previous simulation results. Additionally, we also found D-exp/D-uni initially drops quickly with increasing effective surface charge and then it tends to an asymptotic value (similar to 0.85), it is supposedly due to the saturation of effective charge. Our relevant computer simulations confirmed that the study scheme that using D-exp/D-uni as an indicator to assess the homogeneity of crystal structure is tenable and the simulation results are consistent with experiments.
学科主题	物理力学
分类号	二类/Q1
收录类别	SCI ; EI
资助信息	National Natural Science Foundation of China (NNSFC) [11172302, 10972217, 11032011, 20903112]
原文出处	http://dx.doi.org/10.1063/1.4815920
语种	英语
WOS记录号	WOS:000323177900051
公开日期	2013-09-09
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/47414]
专题	力学研究所_国家微重力实验室
推荐引用方式 GB/T 7714	Zhou HW,Xu SH,Ouyang WZ,et al. Influence of the surface charge on the homogeneity of colloidal crystals[J]. JOURNAL OF CHEMICAL PHYSICS,2013,139(6):064904/1-064904/7.
APA	Zhou HW,Xu SH,Ouyang WZ,Sun ZW,&Liu LX.(2013).Influence of the surface charge on the homogeneity of colloidal crystals.JOURNAL OF CHEMICAL PHYSICS,139(6),064904/1-064904/7.
MLA	Zhou HW,et al."Influence of the surface charge on the homogeneity of colloidal crystals".JOURNAL OF CHEMICAL PHYSICS 139.6(2013):064904/1-064904/7.