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arXiv 0905.1768cond-mat.soft
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二维胶体混合物中的晶核和结构关联:实验与模拟

Crystal nuclei and structural correlations in two-dimensional colloidal mixtures: experiment versus simulation

L Assoud, F Ebert, P Keim, R Messina, G Maret, H Löwen

摘要:

我们研究二元混合物的超顺磁性胶体粒子局限于一个二维的水-空气界面的真实空间实验和Monte-Carlo计算机模拟在高耦合强度。在模拟中,相互作用被建模为成对偶极-偶极排斥。当磁偶极矩的比值固定时,由外部磁场和相对成分控制的相互作用强度是变化的。模拟和实验之间的良好协议被发现的部分对分布函数,包括在高耦合的相邻壳层的精细结构。此外,在熔体中的本地晶核确定的键取向序参量和他们的贡献对结构进行了讨论。

英文摘要:

We examine binary mixtures of superparamagnetic colloidal particles confined to a two-dimensional water-air interface both by real-space experiments and Monte-Carlo computer simulations at high coupling strength. In the simulations, the interaction is modelled as a pairwise dipole-dipole repulsion. While the ratio of magnetic dipole moments is fixed, the interaction strength governed by the external magnetic field and the relative composition is varied. Excellent agreement between simulation and experiment is found for the partial pair distribution functions including the fine structure of the neighbour shells at high coupling. Furthermore local crystal nuclei in the melt are identified by bond-orientational order parameters and their contribution to the pair structure is discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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