Abstract
An intermediate surfactant-templated silica (STS) layer is applied between the supporting mesoporous gamma-Al2O3 and the amorphous microporous silica overlayer resulting in dual-layered microporous silica membranes for gas separation applications that show improved values for both hydrogen flux and selectivity. Determination of thickness and porosity of as-deposited membrane layers by spectroscopic ellipsometry reveals that the STS layer is present as a distinctive layer of sim20 nm thickness, with penetration up to a depth of sim70 nm into the underlying gamma-Al2O3support layer, whose thickness and porosity are determined to be 1.3 mgrm and 50%, respectively.
Original language | English |
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Pages (from-to) | 205-208 |
Number of pages | 4 |
Journal | Journal of sol-gel science and technology |
Volume | 31 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2004 |
Keywords
- 2023 OA procedure
- Microporous
- Surfactant templated silica
- Ellipsometry
- Gas separation
- Hydrogen