Layered silicate by proton exchange and swelling of AMH-3
| Autor: | Weontae Oh, Sankar Nair, Sunho Choi, Joshua A. Sheffel, Daniel F. Shantz, Joaquín Coronas, Michael Tsapatsis, Edgar Jordan |
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| Rok vydání: | 2008 |
| Předmět: |
endocrine system
Nanocomposite Ion exchange urogenital system Nanoporous Intercalation (chemistry) Analytical chemistry General Chemistry Condensed Matter Physics Molecular sieve Silicate chemistry.chemical_compound Silanol Adsorption chemistry Chemical engineering Mechanics of Materials General Materials Science hormones hormone substitutes and hormone antagonists |
| Zdroj: | Microporous and Mesoporous Materials. 115:75-84 |
| ISSN: | 1387-1811 |
| Popis: | Proton-exchanged AMH-3 was prepared by ion exchange of interlayer cations of the layered silicate AMH-3 using an aqueous solution of amino acid. Moreover, swollen AMH-3 was prepared by a procedure involving sequential intercalation of primary amine molecules following proton exchange. Structural characteristics of both AMH-3 derivative materials were investigated using characterization techniques such as XRD, SEM, TEM, NMR, FT-IR, TGA, and N2 adsorption. Both processes lead to structural changes and condensation of silanol groups located on the silicate layer surface. Proton-exchanged AMH-3 is an amorphous powder with the same particle size and shape as the original AMH-3 crystals. Due to the structural changes, swollen AMH-3 should be considered as a new layered silicate material rather than an intercalated phase. The swollen AMH-3 powder shows limited evidence for the presence of a nanoporous framework, suggesting that its use as a molecular sieve additive for improved selectivity nanocomposite membranes is worth exploring. |
| Databáze: | OpenAIRE |
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