10.1021/acs.macromol.8b02426.s002 Hiroki Inoue Hiroki Inoue Tomoyasu Hirai Tomoyasu Hirai Haruka Hanochi Haruka Hanochi Keigo Oyama Keigo Oyama Hiroyuki Mayama Hiroyuki Mayama Yoshinobu Nakamura Yoshinobu Nakamura Syuji Fujii Syuji Fujii Poly(3-hexylthiophene) Grains Synthesized by Solvent-Free Oxidative Coupling Polymerization and Their Use as Light-Responsive Liquid Marble Stabilizer American Chemical Society 2019 water surface FeCl 3 oxidant X-ray photoelectron spectroscopy studies Solubility test chloride ions Solvent-Free Oxidative near-infrared laser-induced Marangoni flow near-infrared laser irradiation poly hexyl side chains 3- hexylthiophene marble stabilizer surface tension 1 H light-to-heat photothermal property temperature increase resonance studies photothermal property Light-Responsive Liquid Marble Stabilizer Solvent-free oxidative scanning electron microscopy studies 2019-01-10 20:48:31 Media https://acs.figshare.com/articles/media/Poly_3-hexylthiophene_Grains_Synthesized_by_Solvent-Free_Oxidative_Coupling_Polymerization_and_Their_Use_as_Light-Responsive_Liquid_Marble_Stabilizer/7575551 Solvent-free oxidative coupling polymerization of 3-hexylthiophene using FeCl<sub>3</sub> oxidant was conducted to synthesize poly­(3-hexylthiophene) grains. Optical and scanning electron microscopy studies confirmed production of submillimeter-sized atypical grains with rough surfaces. Solubility test, Fourier transform infrared spectroscopy, and <sup>1</sup>H nuclear magnetic resonance studies indicated the branching and cross-linking of the poly­(3-hexylthiophene). Elemental microanalysis and X-ray photoelectron spectroscopy studies confirmed that the poly­(3-hexylthiophene) grains were doped with chloride ions. The poly­(3-hexylthiophene) grains showed hydrophobic character due to hexyl side chains, and the critical surface tension was determined to be 25.9 mN m<sup>–1</sup>. The poly­(3-hexylthiophene) showed a light-to-heat photothermal property, and near-infrared laser irradiation to the poly­(3-hexylthiophene) grains induced a rapid temperature increase up to 664 °C. The poly­(3-hexylthiophene) grains can work as an effective liquid marble stabilizer with a photothermal property, and the liquid marble exhibited locomotion on a water surface due to near-infrared laser-induced Marangoni flow.