Hydrogel micromotors with catalyst-containing liquid core and shell
Hydrogel micromotors with catalyst-containing liquid core and shell
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DOI：
10.1088/1361-648x/ab0822
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发表时间：
2019-03
期刊：
影响因子：
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通讯作者：
Hong Zhu;S. Nawar;J. Werner;Jinrun Liu;Gaoshan Huang;Y. Mei;D. Weitz;A. Solovev
中科院分区：
文献类型：
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作者：
Hong Zhu;S. Nawar;J. Werner;Jinrun Liu;Gaoshan Huang;Y. Mei;D. Weitz;A. Solovev
甲基丙烯酸酯衍生的水凝胶微胶囊具有独特的性质，包括可逆可调的渗透，纯化和分离溶解的分子物质。赋予这些动态封装系统自主运动将显着提高其效率和适用性。在这里，水凝胶微马达使用复杂的水包油包水双乳液液滴和水包油乳液液滴从玻璃毛细管微流体和随后的光聚合来实现。三种水凝胶微电机的策略进行了探讨：微胶囊薄壳和分散的催化Pt纳米粒子的液体核心，以及水芯微胶囊和均匀的微粒选择性地涂有Ti/Pt催化层。在过氧化氢溶液中实现水凝胶颗粒和胶囊的自主运动，其中产生的氧气微泡推动动态响应的微马达。微马达通过重量、浮力、横向毛细力来平衡，并且显示出显著扩展水凝胶的短程动态响应的特定自主行为。基于液滴的微流体技术代表了多功能子系统的集成和化学微机械的高通量设计的范式转变，以合理的数量实现其所需的生物医学，环境和流动/扩散微反应器应用。
Methacrylic anhydride-derived hydrogel microcapsules have unique properties, including reversibly tunable permeation, purification, and separation of dissolved molecular species. Endowing these dynamic encapsulant systems with autonomous motion will significantly enhance their efficiency and applicability. Here, hydrogel micromotors are realized using complex water-in-oil-in-water double emulsion drops and oil-in-water emulsion drops from glass capillary microfluidics and subsequent photopolymerization. Three hydrogel micromotor strategies are explored: microcapsules with thin shells and liquid cores with dispersed catalytic Pt nanoparticles, as well as water-cored microcapsules and homogeneous microparticles selectively coated with Ti/Pt catalytic layers. Autonomous motion of hydrogel particles and capsules is realized in hydrogen peroxide solutions, where generated oxygen microbubbles propel the dynamically responsive micromotors. The micromotors are balanced by weight, buoyancy, lateral capillary forces and show specific autonomous behaviours that significantly extend short range dynamic responses of hydrogels. Drop-based microfluidics represent a paradigm shift in the integration of multifunctional subsystems and high-throughput design of chemical micromachines in reasonable quantities towards their desired biomedical, environmental and flow/diffusion microreactor applications.