Volume 40, Number 3, November I 1997
|Page(s)||337 - 342|
|Section||Cross-disciplinary physics and related areas of science and technology|
|Published online||01 September 2002|
Fluid-solid transitions on walls in binary hard-sphere mixtures
Department of Physics and Astronomy, University of
Pennsylvania, 209 S. 33 St., Philadelphia, PA 19104, USA
2 Unilever Research Port Sunlight Laboratory, Quarry Road East, Bebington, Wirral, L63 3JW, UK
3 Department of Physics and Astronomy, The University of Edinburgh, Mayfield Road, Edinburgh, EH9 3JZ, Scotland, UK
Accepted: 8 August 1997
We present measurements and theory of a fluid-solid phase transition at a hard, flat wall in a two-sized hard-sphere mixture. With particle concentrations well below the level for bulk phase separation, a fluid monolayer (enriched in the larger spheres) forms at the wall. At slightly higher concentrations, the wall-fluid freezes into a wall-solid phase which coexists with the bulk fluid. Measurements of large-sphere area fraction vs. small-sphere bulk concentration in the fluid and solid phases are in reasonable agreement with the predictions of a model that accounts for entropic excluded-volume effects at a flat wall.
PACS: 82.70.Dd – Colloids / 64.75.+g – Solubility, segregation, and mixing; phase separation / 68.35.Rh – Phase transitions and critical phenomena
© EDP Sciences, 1997
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