Fabrication of micro reaction cages with tailored properties.
Fabrication of micro reaction cages with tailored properties.
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DOI：
10.1021/ja002911e
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发表时间：
2001-05
影响因子：
15
通讯作者：
L. Dähne;S. Leporatti;E. Donath;H. Möhwald
中科院分区：
文献类型：
--
作者：
L. Dähne;S. Leporatti;E. Donath;H. Möhwald
制备了微微米和亚微米尺寸的中空聚电解质胶囊。它们的内部通过“瓶中船”合成共聚物实现功能化。虽然单体容易渗透胶囊壁，但形成的聚合物仍留在胶囊笼中。胶囊内部的物理化学性质，如离子强度、pH值、光吸收和荧光，可以通过捕获聚合物的化学性质独立于周围溶剂进行控制。在聚电解质的情况下，反离子的渗透压导致胶囊的膨胀，这对于微观力学是重要的。光敏材料的功能化允许胶囊内的选择性光反应。高浓度聚电解质的合成导致囊壁与聚合物相互缠绕。改性后的壁具有离子交换膜的特性，对有机离子的吸附和渗透具有选择性。改进后的胶囊为控制沉淀的容器、催化反应的纳米反应器或传感器等新应用提供了许多可能性。
Hollow polyelectrolyte capsules in micro- and submicrometer size were prepared. Their interior was functionalized by a "ship in bottle" synthesis of copolymers. While the monomers permeated the capsule wall easily, the formed polymers remained in the capsule cage. The physicochemical properties of the capsule interior such as ion strength, pH, light absorption, and fluorescence could be controlled independently from the surrounding solvent by means of the chemical nature of the captured polymer. In case of polyelectrolytes the osmotic pressure of the counterions led to a swelling of the capsules which can be important for micromechanics. The functionalization with light-sensitive materials allowed selective photoreactions inside the capsules. Synthesis of polyelectrolytes at high concentration resulted in an intertwining of the capsule wall with the polymer. The modified walls behaved like ion exchange membranes and showed selectivity toward adsorption and permeation of organic ions. The modified capsules offer many possibilities for novel applications as containers for controlled precipitation, as nanoreactors for catalyzed reactions, or as sensors.