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  • 标题:Floating nematic phase in colloidal platelet-sphere mixtures
  • 本地全文:下载
  • 作者:Daniel de las Heras ; Nisha Doshi ; Terence Cosgrove
  • 期刊名称:Scientific Reports
  • 电子版ISSN:2045-2322
  • 出版年度:2012
  • 卷号:2
  • DOI:10.1038/srep00789
  • 出版社:Springer Nature
  • 摘要:

    The phase behaviour of colloidal dispersions is interesting for fundamental reasons and for technological applications such as photonic crystals and electronic paper. Sedimentation, which in everyday life is relevant from blood analysis to the shelf life of paint, is a means to determine phase boundaries by observing distinct layers in samples that are in sedimentation-diffusion equilibrium. However, disentangling the effects due to interparticle interactions, which generate the bulk phase diagram, from those due to gravity is a complex task. Here we show that a line in the space of chemical potentials µi, where i labels the species, represents a sedimented sample and that each crossing of this sedimentation path with a binodal generates an interface under gravity. Complex phase stacks can result, such as the sandwich of a floating nematic layer between top and bottom isotropic phases that we observed in a mixture of silica spheres and gibbsite platelets.

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    © 2012 Macmillan Publishers Limited. All rights reserved

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