総説・解説等 - 朝倉　浩一

Special Issue: The 2^nd World Congress on Oleo Science, WCOS 2022

Asakura K.

Journal of Oleo Science 73 （ 4 ） 389 - 392 2024年

ISSN  13458957

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Theory of Turing pattern formation and its experimental realization in the CIMA reaction system in the presence of materials lowering the diffusivity of activators

Aizawa A., Asakura K.

Frontiers in Physics 12 2024年

　概要を見る

In 1952, Alan Turing accomplished a pioneering theoretical study to show that the coupling of nonlinear chemical reactions and diffusion leads to the instability of spatially homogeneous states. The activator and inhibitor are synthesized as intermediates of the reaction system in the Turing model. Turing found that spatially periodic stationary concentration patterns are spontaneously generated when the diffusion coefficient of the activator is lower than that of the inhibitor. The first experimental realization of the Turing pattern was achieved in 1990 in a chlorite–iodide–malonic acid (CIMA) reaction system. Iodide and chlorite anions act as the activator and inhibitor of this reaction system, respectively. Although there is no significant difference in the diffusion coefficient of iodide and chlorite anions, the Turing pattern was generated because starch was added to the gel reactor to enhance the color tone. This formed a complex with iodide to inhibit its diffusion to satisfy the condition for the Turing instability. Several examples were found after this finding. We focused on the high affinity of quaternary alkyl ammonium cations to iodide. The CIMA reaction was performed in an open gel reactor by adding a quaternary alkyl ammonium cationic surfactant. In addition, the polymer gel consists of the quaternary alkyl ammonium group as the side chain was utilized for the open gel reactor. The micelles of the surfactants and the polymer gels trapped iodide in their vicinity as a counter anion to lower the effective diffusivity to satisfy the condition for the Turing instability.

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サンスクリーン剤のSPF測定のための新規なin vitro法の提案

朝倉浩一, 藤代美有紀, 矢作彰一, 黒田章裕

フレグランスジャーナル 50 （ 1 ） 19 - 25 2022年01月

塗工過程における自発的な空間周期構造の発生とその制御による表面の機能化

朝倉 浩一

塗装工学 48 （ 5 ） 190 - 197 2013年05月

単著

表面形成における非平衡系の自己組織化の制御

朝倉 浩一

オレオサイエンス 13 （ 4 ） 171 - 177 2013年04月

単著

キラルな物質を生成する反応系における撹拌による光学純度の制御

朝倉浩一

日本油化学会誌  2000年06月

結晶化系における自動触媒的キラリティーの増殖を利用した光学活性体合成法の開発

朝倉浩一

天野工業技術研究所平成10年度年次報告    11 - 18 1999年12月

水溶液中におけるp-クレゾールの酸化カップリング反応により合成されるオリゴマーの重合度制御

朝倉浩一, 小山内州一

平成８年杉山産業化学研究所年報  1997年01月