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Open AccessCommunication

Tuning Patchy Bonds Induced by Critical Casimir Forces

Institute of Physics, University of Amsterdam, 1098 XH Amsterdam, The Netherlands
Faculty of Electrical Engineering, Electronics-Telecommunications, Cantho University of Technology, Cantho 901184, Vietnam
Van’t Hoff Institute for Molecular Sciences, University of Amsterdam, 1098 XH Amsterdam, The Netherlands
Huygens-Kamerlingh Onnes Laboratory, Leiden University, 2333 CA Leiden, The Netherlands
Author to whom correspondence should be addressed.
Materials 2017, 10(11), 1265;
Received: 22 September 2017 / Revised: 30 October 2017 / Accepted: 31 October 2017 / Published: 3 November 2017
(This article belongs to the Special Issue Designed Colloidal Self-Assembly)
Experimental control of patchy interactions promises new routes for the assembly of complex colloidal structures, but remains challenging. Here, we investigate the role of patch width in the assembly of patchy colloidal particles assembled by critical Casimir forces. The particles are composed of a hydrophobic dumbbell with an equatorial hydrophilic polymer shell, and are synthesized to have well-defined patch-to-shell area ratios. Patch-to-patch binding is achieved in near-critical binary solvents, in which the particle interaction strength and range are controlled by the temperature-dependent solvent correlation length. Upon decreasing the patch-to-shell area ratio, we observe a pronounced change of the bonding morphology towards directed single-bonded configurations, as clearly reflected in the formation of chain-like structures. Computer simulations using an effective critical Casimir pair potential for the patches show that the morphology change results from the geometric exclusion of the increasingly thick hydrophilic particle shells. These results highlight the experimental control of patchy interactions through the engineering of the building blocks on the way towards rationally designed colloidal superstructures. View Full-Text
Keywords: colloidal assembly; patchy colloid; critical Casimir effect colloidal assembly; patchy colloid; critical Casimir effect
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MDPI and ACS Style

Nguyen, T.A.; Newton, A.; Kraft, D.J.; Bolhuis, P.G.; Schall, P. Tuning Patchy Bonds Induced by Critical Casimir Forces. Materials 2017, 10, 1265.

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