Autonomous movement of platinum-loaded stomatocytes
Autonomous movement of platinum-loaded stomatocytes
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DOI：
10.1038/nchem.1281
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发表时间：
2012-04-01
期刊：
影响因子：
21.8
通讯作者：
van Hest, Jan C. M.
中科院分区：
文献类型：
--
作者：
Wilson, Daniela A.;Nolte, Roeland J. M.;van Hest, Jan C. M.
聚合物气孔细胞是通过聚合物囊泡的受控变形形成的纳米尺寸的碗状结构。稳定的纳米腔和严格控制的开口是理想的物理截留的纳米粒子，催化活性时，可以把口腔细胞形态成纳米反应器。在这里，我们报告了一种方法，以产生自主运动的聚合物气孔细胞通过选择性地截留催化活性铂纳米粒子在其nanocavities，随后使用催化作为驱动力的运动。过氧化氢可以自由进入口腔细胞内腔，在那里它被活性催化剂（捕获的铂纳米颗粒）分解成氧气和水。这会产生快速放电，从而引起推力和定向运动。装载铂的口细胞的设计类似于微型单组元推进剂火箭发动机，其中口细胞的受控打开引导分解产物从反应室（口细胞内腔）排出。
Polymer stomatocytes are bowl-shaped structures of nanosize dimensions formed by the controlled deformation of polymer vesicles. The stable nanocavity and strict control of the opening are ideal for the physical entrapment of nanoparticles which, when catalytically active, can turn the stomatocyte morphology into a nanoreactor. Herein we report an approach to generate autonomous movement of the polymer stomatocytes by selectively entrapping catalytically active platinum nanoparticles within their nanocavities and subsequently using catalysis as a driving force for movement. Hydrogen peroxide is free to access the inner stomatocyte cavity, where it is decomposed by the active catalyst (the entrapped platinum nanoparticles) into oxygen and water. This generates a rapid discharge, which induces thrust and directional movement. The design of the platinum-loaded stomatocytes resembles a miniature monopropellant rocket engine, in which the controlled opening of the stomatocytes directs the expulsion of the decomposition products away from the reaction chamber (inner stomatocyte cavity).