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Issue 5, 2006
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AlPO-18 nanocrystals synthesized under microwave irradiation

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AlPO-18 nanocrystals (AEI type structure) were synthesized from clear precursor solutions by employing microwave energy. The samples were heated at 130 °C for 5–60 min, and complete crystallization of nanosized AlPO-18 occurred after 30 min. Additionally, micron-sized AlPO-18 molecular sieve was synthesized in a dense gel precursor system; the crystallization behaviour of both nano- and micron-sized AlPO-18 was investigated. The size and morphology of micron-sized AlPO-18 crystals differ substantially from the nanosized molecular sieve exhibiting a high degree of monodispersity and stability in H2O suspensions. The stability of AlPO-18 crystal suspensions was followed with zeta potential measurements at different pH and sol concentrations. According to thermogravimetric analyses and isothermal adsorption/desorption of both nitrogen and water, the nanosized AlPO-18 possesses a larger accessible pore volume and a higher water affinity than the micron-sized crystals.

Graphical abstract: AlPO-18 nanocrystals synthesized under microwave irradiation

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Publication details

The article was received on 03 Oct 2005, accepted on 10 Nov 2005 and first published on 01 Dec 2005

Article type: Paper
DOI: 10.1039/B513947C
Citation: J. Mater. Chem., 2006,16, 514-518

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    AlPO-18 nanocrystals synthesized under microwave irradiation

    H. van Heyden, S. Mintova and T. Bein, J. Mater. Chem., 2006, 16, 514
    DOI: 10.1039/B513947C

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