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Template-free Synthesis and Structural Evolution of Discrete Hydroxycancrinite Zeolite Nanorods from High-Concentration Hydrogels

Abstract

We report a synthesis and characterization of hydroxycancrinite zeolite nanorods by a simple hydrothermal treatment of aluminosilicate hydrogels at high concentrations of precursors without a presence of structure-directing agents. Transmission electron microscopic (TEM) analysis reveals that cancrinite nanorods, with lengths of 200 – 800 nm and diameters of 30 – 50 nm, exhibit a hexagonal morphology and are elongated along the crystallographic c direction. The powder X-ray diffraction (PXRD), Fourier transform infrared (FT-IR) and TEM studies revealed sequential events of hydrogel formation, formation of aggregated sodalite nuclei, conversion of sodalite to cancrinite and finally growth of cancrinite nanorods into discrete particles. The aqueous dispersion of the discrete nanorods displays a good stability between pH 6 – 12 with the zeta potential no greater than –30 mV. The synthesis is unique in that the initial aggregated nanocrystals do not grow into microsized particles (aggregative growth) but into discrete nanorods. Our findings demonstrate an unconventional possibility that discrete zeolite nanocrystals could be produced from a concentrated hydrogel.

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Publication details

The article was received on 04 Aug 2017, accepted on 03 Nov 2017 and first published on 03 Nov 2017


Article type: Paper
DOI: 10.1039/C7NR05770A
Citation: Nanoscale, 2017, Accepted Manuscript
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    Template-free Synthesis and Structural Evolution of Discrete Hydroxycancrinite Zeolite Nanorods from High-Concentration Hydrogels

    S. Chen, L. P. Sorge and D. Seo, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR05770A

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