Hierarchical porous structures by using zeolite nanocrystals as building blocks
✍ Scribed by Limin Huang; Zhengbao Wang; Huanting Wang; Jinyu Sun; Quanzhi Li; Dongyuan Zhao; Yushan Yan
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 272 KB
- Volume
- 48
- Category
- Article
- ISSN
- 1387-1811
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✦ Synopsis
Hierarchical porous structures have been fabricated using colloidal zeolite silicalite nanocrystals as building blocks. Continuous, uniform, optically transparent and self-standing silicalite membranes with well-de®ned shapes and controlled mesoporosity were obtained by self-assembly of zeolite nanocrystals followed by high-pressure compression and controlled secondary crystal growth via microwave treatment. The thickness of the compact self-standing membranes is tunable from 20 lm to several millimeters by simply using dierent surface weight densities. Controlled secondary growth via microwave treatment leads to a stronger self-standing membrane with controlled mesoporosity and has little eect on its thickness, crystallinity, micropore surface area and micropore volume.