Experimental Observation of Structural Crossover in Binary Mixtures of Colloidal Hard Spheres
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Using confocal-microscopy we investigate the structure of binary mixtures of colloidal hard spheres with size ratio q=0.61. As a function of the packing fraction of the two particle species, we observe a marked change of the dominant wavelength in the pair correlation function. This behavior is in excellent agreement with a recently predicted structural crossover in such mixtures. In addition, the repercussions of structural crossover on the real-space structure of a binary fluid are analyzed. We suggest a relation between crossover and the lateral extension of networks containing only equally sized particles that are connected by nearest neighbor bonds. This is supported by Monte-Carlo simulations which are performed at different packing fractions and size ratios.
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BAUMGARTL, Jörg, Roel P. A. DULLENS, Marjolein DIJKSTRA, Roland ROTH, Clemens BECHINGER, 2007. Experimental Observation of Structural Crossover in Binary Mixtures of Colloidal Hard Spheres. In: Physical Review Letters. 2007, 98(19), 198303. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.98.198303BibTex
@article{Baumgartl2007-04-03T08:26:02ZExper-39567, year={2007}, doi={10.1103/PhysRevLett.98.198303}, title={Experimental Observation of Structural Crossover in Binary Mixtures of Colloidal Hard Spheres}, number={19}, volume={98}, issn={0031-9007}, journal={Physical Review Letters}, author={Baumgartl, Jörg and Dullens, Roel P. A. and Dijkstra, Marjolein and Roth, Roland and Bechinger, Clemens}, note={Article Number: 198303} }
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