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Selective Janus Particle Assembly at Tipping Points of Thermally‐Switched Wetting
Author(s) -
Yu Changqian,
Zhang Jie,
Granick Steve
Publication year - 2014
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201310465
Subject(s) - wetting , janus , janus particles , particle (ecology) , spheres , colloid , chemical engineering , colloidal gold , materials science , atmospheric temperature range , range (aeronautics) , nanotechnology , thermal , chemical physics , chemistry , nanoparticle , composite material , thermodynamics , oceanography , physics , astronomy , geology , engineering
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.