Abstract
Gold was vacuum-deposited on one side of 6-μm-diameter SiO2 particles to prepare Janus particles (JPs). A thiol-terminated pH-responsive polymer (pAaH-SH), prepared via reversible addition–fragmentation chain transfer (RAFT) -controlled radical polymerization, was immobilized on the gold surface of the JPs as confirmed by attenuated total reflection-Fourier transform infrared and X-ray photoelectron spectroscopy measurement techniques. A fluorescein-labeled polymer (p(AaH/Flu)-SH) was also prepared via RAFT, and immobilization of p(AaH/Flu)-SH only on the gold surface of the JPs was confirmed by fluorescence microscopy observations. The flocculation and dispersion behavior of pAaH-SH-grafted JPs was observed with an optical microscope and was found to be varied with the solution pH.
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