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首页> 外文期刊>Nanotechnology >Thermoswitchable catalysis controlled by reversible dispersion/aggregation change of nanoreactors in the presence of alpha-CD polymers
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Thermoswitchable catalysis controlled by reversible dispersion/aggregation change of nanoreactors in the presence of alpha-CD polymers

机译：通过α-CD聚合物存在的纳米反应器的可逆色散/聚集变化来控制热循环催化

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摘要

The present work was aimed at preparing a thermosensitive nanoreactor system which could adjust its dispersion/aggregation status according to external temperature change to achieve the switchable catalysis. The mesoporous silica nanoparticle (MSNP) was selected as the framework material of the nanoreactor, and Ag nanoparticles were encapsulated in the mesoporous silica by an in situ reaction. Dodecyl groups were introduced onto MSNP surface, which could transform reversibly between complexation and disassociation with alpha-cyclodextrin (CD) cavity upon temperature change. It was found that the nanoreactors aggregated and the catalysis was effectively switched 'off' in the presence of CD polymers at low temperature (20 degrees C). However, when the temperature increased to 50 degrees C, the nanoreactors redispersed and catalysis successfully switched 'on'.
机译：目前的作品旨在制备热敏纳米反应器系统，该系统可以根据外部温度变化调节其色散/聚集状态，以实现可切换催化。 选择介孔二氧化硅纳米粒子（MSNP）作为纳米反应器的骨架材料，通过原位反应将Ag纳米颗粒包封在中孔二氧化硅中。 将十二烷基引入MSNP表面，这可以在温度变化时与α-环糊精（CD）腔之间的络合和脱离之间可逆地转化。 发现聚集的纳米反应器和催化剂在低温（20℃）的Cd聚合物存在下有效地切换'OFF'。 但是，当温度增加到50℃时，纳米反应器重新分离和催化成功切换'ON'。

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