Phys. Rev. E 75, 021501 (2007) [6 pages]Confinement-induced liquid ordering investigated by x-ray phase retrievalReceived 29 August 2006; revised 30 October 2006; published 6 February 2007 Using synchrotron x-ray diffraction, we have determined the ensemble-averaged density profile of colloidal fluids within confining channels of different widths. We observe an oscillatory ordering-disordering behavior of the colloidal particles as a function of the channel width, while the colloidal solution remains in the liquid state. This phenomenon has been suggested by surface force studies of hard-sphere fluids and also theoretically predicted, but here we see it by direct measurements of the structure for comparable systems. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevE.75.021501
DOI:
10.1103/PhysRevE.75.021501
PACS:
61.10.Eq, 82.70.Dd, 61.20.−p, 68.15.+e
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