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Dynamic Microcapsules with Rapid and Reversible Permeability Switching

机译：具有快速和可逆的磁导率转换的动态微胶囊

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摘要

Dynamic microcapsules are reported that exhibit shell membranes with fast and reversible changes in permeability in response to external stimuli. A hydrophobic anhydride monomer is employed in the thiol-ene polymerization as a disguised precursor for the acid-containing shells; this enables the direct encapsulation of aqueous cargo in the liquid core using microfluidic fabrication of water-in-oil-in-water double emulsion drops. The poly(anhydride) shells hydrolyze in their aqueous environment without further chemical treatment, yielding cross-linked poly(acid) microcapsules that exhibit trigger-responsive and reversible property changes. The microcapsule shell can actively be switched numerous times between impermeable and permeable due to the exceptional mechanical properties of the thiol-ene network that prevent rupture or failure of the membrane, allowing it to withstand the mechanical stresses imposed on the capsule during the dynamic property changes. The permeability and molecular weight cutoff of the microcapsules can dynamically be controlled with triggers such as pH and ionic environment. The reversibly triggered changes in permeability of the shell exhibit a response time of seconds, enabling actively adjustable release profiles, as well as on-demand capture, trapping, and release of cargo molecules with molecular selectivity and fast on-off rates.
机译：据报道，动态微囊表现出对外部刺激响应具有快速且可逆的渗透性变化的壳膜。疏水酸酐单体在硫醇-烯聚合反应中用作含酸壳的变相前体；这使得可以使用微流体制备水包油包水型双乳液滴剂将水性货物直接封装在液芯中。聚（壳）壳在其含水环境中水解，无需进一步化学处理，得到交联的聚（酸）微囊，其表现出触发响应和可逆的性质变化。由于硫醇-烯网络的卓越机械性能可防止膜破裂或破裂，因此微囊壳可以在不渗透性和可渗透性之间主动切换多次，从而防止膜在动态特性变化过程中承受施加在胶囊上的机械应力。微胶囊的渗透性和分子量截留可以通过诸如pH和离子环境的触发来动态地控制。壳的渗透性的可逆触发变化显示了几秒钟的响应时间，可实现主动可调的释放曲线，以及按需捕获，捕获和释放具有分子选择性和快速开关速率的货物分子。

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