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Accelerated microwave assisted synthesis of alumino-germanate imogolite nanotubes

Abstract : Ge-imogolite nanotubes (Al2GeO7H4) can be readily obtained in various lengths, chemical compositions and crystallinities, opening up new perspectives for applications. Their classical synthesis includes the nucleation of roof-tile shaped precursors at room temperature followed by heat promoted growth (typically 95°C) for at least 4 to 7 days. To circumvent this excessively long synthesis duration, we used microwave assisted heating to accelerate the growth. Micron sized tubes were formed from 1hr at 100°C, and best results were obtained for 2 hours at 200°C, i.e approximately 100 fold faster when compared to the conventional heating process. Additionally, tube lengths were shifted towards larger values by one order of magnitude, leading to micron sized Ge-imogolites vs. 100 nm with conventional heating. Specific microwave effects as well as mechanisms leading to these longer tubes are also discussed.
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Submitted on : Tuesday, January 10, 2017 - 12:21:00 PM
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A. Avellan, C. Levard, Corinne Chaneac, D. Borschneck, Francis R.A. Onofri, et al.. Accelerated microwave assisted synthesis of alumino-germanate imogolite nanotubes. RSC Advances, Royal Society of Chemistry, 2016, 6 (109), pp.108146 - 108150. ⟨10.1039/C6RA19275K⟩. ⟨hal-01430836⟩



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