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A simple sol–gel process is followed to construct a thin layer of mesoporous silica shell core–shell structure on micrometer sized and nanometer sized zeolite A (micro-zeolite A@SiO 2 and nano-zeolite A@SiO 2 respectively). Further thickness of the silica shells has been tuned from 20 to 50nm while the zeolite A particle size changes from nanometer to micrometer. Pores of the silica...
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