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Controlling the Organization of Colloidal Sphero-Cylinders Using Confinement in a Minority Phase

School of Physics & Astronomy, University of Edinburgh, Peter Guthrie Tait Road, Edinburgh EH9 3FD, UK
Author to whom correspondence should be addressed.
Current address: AkzoNobel, Stoneygate Lane, Felling, Gateshead NE10 0JY, UK.
Received: 23 December 2017 / Revised: 25 January 2018 / Accepted: 26 January 2018 / Published: 2 February 2018
(This article belongs to the Special Issue Colloid Chemistry)
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We demonstrate experimentally that a phase-separating host solvent can be used to organize colloidal rods into different cluster and network states. The rods are silica sphero-cylinders which are preferentially wet by the water-rich phase of an oil–water binary liquid system. By beginning with the rods dispersed in the single-fluid phase and then varying the temperature to enter the demixed regime, a precisely chosen volume of water-rich phase can be created. We then show how this can be used to create independent clusters of rods, a percolating network, a network of clusters or a system that undergoes hindered phase separation. These different modes are selected by choosing the relative volumes of the rods and the water-rich phase and by the timing of the temperature change. View Full-Text
Keywords: colloid; wetting; capillarity colloid; wetting; capillarity

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Hijnen, N.; Clegg, P.S. Controlling the Organization of Colloidal Sphero-Cylinders Using Confinement in a Minority Phase. Gels 2018, 4, 15.

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