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Direct measurement of osmotic pressure via adaptive confinement of quasi hard disc colloids.
MedLine Citation:
PMID:  24084759     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Confining a system in a small volume profoundly alters its behaviour. Hitherto, attention has focused on static confinement where the confining wall is fixed such as in porous media. However, adaptive confinement where the wall responds to the interior has clear relevance in biological systems. Here we investigate this phenomenon with a colloidal system of quasi hard discs confined by a ring of particles trapped in holographic optical tweezers, which form a flexible elastic wall. This elasticity leads to quasi-isobaric conditions within the confined region. By measuring the displacement of the tweezed particles, we obtain the radial osmotic pressure. We further find a novel bistable state of a hexagonal structure and concentrically layered fluid mimicking the shape of the confinement. The hexagonal configurations are found at lower pressure than those of the fluid, thus the bistability is driven by the higher entropy of disordered arrangements, unlike bulk hard systems.
Authors:
Ian Williams; Erdal C Oğuz; Paul Bartlett; Hartmut Löwen; C Patrick Royall
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Publication Detail:
Type:  JOURNAL ARTICLE    
Journal Detail:
Title:  Nature communications     Volume:  4     ISSN:  2041-1723     ISO Abbreviation:  Nat Commun     Publication Date:  2013 Oct 
Date Detail:
Created Date:  2013-10-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101528555     Medline TA:  Nat Commun     Country:  -    
Other Details:
Languages:  ENG     Pagination:  2555     Citation Subset:  -    
Affiliation:
1] H.H. Wills Physics Laboratory, Tyndall Avenue, Bristol BS8 1TL, UK [2] School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK [3] Centre for Nanoscience and Quantum Information, Tyndall Avenue, Bristol BS8 1FD, UK.
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