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化学反応によって駆動される液滴の運動 : 化学-機械エネルギー変換の実空間モデル(基研研究会「非平衡系の新局面-運動・機能・構造-」,研究会報告)
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12. 空間スケールの減少に伴う反応拡散系の特異性(ポスターセッション,ソフトマターの物理学2004-変形と流動-,研究会報告)
Get PDFこの論文は国立情報学研究所の電子図書館事業により電子化されました
A Non-Autonomous Amphoteric Metal Hydroxide Oscillations and Pattern Formation in Hydrogels
Get PDFOscillations in animate and inanimate systems are ubiquitous phenomena driven by sophisticated chemical reaction networks. Non-autonomous chemical oscillators have been designed to mimic oscillatory behavior using programmable syringe pumps. Here, we investigated the non-autonomous oscillations, pattern formation, and front propagation of amphoteric hydroxide (aluminum (III), zinc (II), tin (II), and lead (II)) precipitates under controlled pH conditions. A continuous stirred-tank reactor with modulated inflows of acidic and alkaline solutions generated pH oscillations, leading to periodic precipitation and dissolution of metal hydroxides in time. The generated turbidity oscillations exhibited ion-specific patterns, enabling their characterization through quantitative parameters such as peak width (W) and asymmetry (As). The study of mixed metal cationic systems showed that turbidity patterns contained signatures of both hydroxides due to the formation of mixed hydroxides and oxyhydroxides. The reaction–diffusion setup in solid hydrogel columns produced spatial precipitation patterns depending on metal cations and their concentrations. Additionally, in the case of tin (II), a propagating precipitation front was observed in a thin precipitation layer. These findings provide new insights into precipitation pattern formation and open avenues for metal ion identification and further exploration of complex reaction–diffusion systems
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