String formation and demixing in monolayers of dipolar colloidal mixtures

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	String formation and demixing in monolayers of dipolar colloidal mixtures
	Chen, XS
刊名	JOURNAL OF CHEMICAL PHYSICS
	2011
卷号	135 期号:13 页码:134701
关键词	HYPERNETTED-CHAIN APPROXIMATION NEUTRAL HARD-SPHERES INTEGRAL-EQUATIONS NONSPHERICAL PARTICLES FLUIDS INSTABILITY SIMULATION DENSITY SYSTEMS FIELDS
ISSN号	0021-9606
通讯作者	Chen, XS (reprint author), Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China.
英文摘要	Employing hypernetted chain (HNC) integral equations and a stability analysis we investigate the structure and phase behavior of bidisperse mixtures of dipolar hard spheres with different size ratios s = sigma(S)/sigma(L) confined to a plane. The dipole moments of the particles are perfectly ordered along an in-plane direction, yielding anisotropic interactions favoring chain formation. Exploring a range of size ratios and compositions, our study predicts a complex interplay between aggregation phenomena, on the one hand, and volume phase transitions, on the other hand. In dilute, strongly asymmetric systems (s = 0.5), our HNC analysis indicates chain formation of the large particles, while the small particles act as a weakly correlated background. According to our fluctuation analysis, this aggregation behavior results in combined condensation-demixing transitions, with a trend towards pure demixing when the concentration of the large particles, c(L), becomes small. In dense systems, the most interesting results are found for intermediate size ratios, s similar to 0.7-0.8. Here we find signatures of a concentration-driven transition from pure chains of large particles (large c(L)) to mixed chains with alternating order of large and small particles (small c(L)). The two regimes are separated by a characteristic "jump" in the HNC non-solution line. (C) 2011 American Institute of Physics. [doi:10.1063/1.3643324]
学科主题	Physics
收录类别	SCI
原文出处	http://dx.doi.org/10.1063/1.3643324
语种	英语
WOS记录号	WOS:000295625400058
公开日期	2013-05-17
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/14258]
专题	理论物理研究所_理论物理所1978-2010年知识产出
推荐引用方式 GB/T 7714	Chen, XS. String formation and demixing in monolayers of dipolar colloidal mixtures[J]. JOURNAL OF CHEMICAL PHYSICS,2011,135(13):134701.
APA	Chen, XS.(2011).String formation and demixing in monolayers of dipolar colloidal mixtures.JOURNAL OF CHEMICAL PHYSICS,135(13),134701.
MLA	Chen, XS."String formation and demixing in monolayers of dipolar colloidal mixtures".JOURNAL OF CHEMICAL PHYSICS 135.13(2011):134701.