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题名: String formation and demixing in monolayers of dipolar colloidal mixtures
作者: Luo, L ;  Klapp, SHL ;  Chen, XS
刊名: JOURNAL OF CHEMICAL PHYSICS
出版日期: 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
学科分类: Physics
通讯作者: Chen, XS (reprint author), Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China.
部门归属: [Luo, Liang; Chen, Xiaosong] Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; [Klapp, Sabine H. L.] Tech Univ Berlin, Inst Theoret Phys, D-10623 Berlin, Germany
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]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000295625400058
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/14258
Appears in Collections:理论物理所2011年知识产出_期刊论文

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Recommended Citation:
Luo, L,Klapp, SHL,Chen, XS. String formation and demixing in monolayers of dipolar colloidal mixtures[J]. JOURNAL OF CHEMICAL PHYSICS,2011,135(13):134701.
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