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- W2078765982 abstract "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. Confinement is encountered in systems varying from simple liquids to biological cells. Williams et al. introduce an adaptive confinement with an elastic wall composed of colloidal particles, whereby the osmotic pressure of the confined system can be directly obtained from the displacement of the wall." @default.
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- W2078765982 date "2013-10-02" @default.
- W2078765982 modified "2023-09-29" @default.
- W2078765982 title "Direct measurement of osmotic pressure via adaptive confinement of quasi hard disc colloids" @default.
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- W2078765982 doi "https://doi.org/10.1038/ncomms3555" @default.
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