Volume 126, Issue 17 pp. 4453-4456
Zuschrift

Selective Janus Particle Assembly at Tipping Points of Thermally-Switched Wetting

Changqian Yu

Changqian Yu

Department of Materials Science and Engineering, University of Illinois, Urbana, IL 61801 (USA) http://groups.mrl.uiuc.edu/granick/

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Jie Zhang

Jie Zhang

Department of Materials Science and Engineering, University of Illinois, Urbana, IL 61801 (USA) http://groups.mrl.uiuc.edu/granick/

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Prof. Steve Granick

Corresponding Author

Prof. Steve Granick

Department of Materials Science and Engineering, University of Illinois, Urbana, IL 61801 (USA) http://groups.mrl.uiuc.edu/granick/

Department of Chemistry, and Department of Physics, Urbana, IL 61801 (USA)

Department of Materials Science and Engineering, University of Illinois, Urbana, IL 61801 (USA) http://groups.mrl.uiuc.edu/granick/Search for more papers by this author
First published: 13 March 2014
Citations: 11

This work as supported by the U.S. Army Research Office, Grant W911NF-10-1-0518.

Abstract

Thermal wetting can simply, selectively and reversibly join patchy particles into clusters (2D and 3D) and also colloidal crystals over the narrow temperature range of 1–2 °C. This is demonstrated with Janus particles (gold half-coated silica spheres) immersed in a binary mixture of water/2,6-lutidine, such that the relative strength of gold–gold bonding through hydrophobic interaction and silica–silica bonding through the wetting-induced attraction is reversibly switched according to temperature.

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