Reconfigurable multi-scale colloidal assembly on excluded volume patterns

Scientific Reports
Tara D EdwardsMichael A Bevan

Abstract

The ability to create multi-scale, periodic colloidal assemblies with unique properties is important to emerging applications. Dynamically manipulating colloidal structures via tunable kT-scale attraction can provide the opportunity to create particle-based nano- and microstructured materials that are reconfigurable. Here, we report a novel tactic to obtain reconfigurable, multi-scale, periodic colloidal assemblies by combining thermoresponsive depletant particles and patterned topographical features that, together, reversibly mediate local kT-scale depletion interactions. This method is demonstrated in optical microscopy experiments to produce colloidal microstructures that reconfigure between well-defined ordered structures and disordered fluid states as a function of temperature and pattern feature depth. These results are well described by Monte Carlo simulations using theoretical depletion potentials that include patterned excluded volume. Ultimately, the approach reported here can be extended to control the size, shape, orientation, and microstructure of colloidal assemblies on multiple lengths scales and on arbitrary pre-defined pattern templates.

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Citations

Dec 24, 2014·Journal of Colloid and Interface Science·Yuguang YangMichael A Bevan
Jul 14, 2016·Proceedings of the National Academy of Sciences of the United States of America·Anirudha BanerjeeTodd M Squires
Jul 9, 2016·ACS Nano·Xun TangMichael A Bevan
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Aug 24, 2017·The Journal of Chemical Physics·Anna C H Coughlan, Michael A Bevan
Nov 5, 2019·The Journal of Chemical Physics·Yuguang Yang, Bo Li
Feb 6, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Michael J Solomon

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