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The stability of halloysite nanotubes in acidic and alkaline aqueous suspensions
The long term stability of natural halloysite nanotubes was studied at room temperature (22 ± 2 °C) in pure water, acidic and basic aqueous suspensions. The structural and morphological transformations of nanotubes were studied by TEM, SEM, nitrogen adsorption, XRD Raman and FTIR spectroscopy accomp...
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Published in: | Nanotechnology 2012-02, Vol.23 (6), p.065705-1-10 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The long term stability of natural halloysite nanotubes was studied at room temperature (22 ± 2 °C) in pure water, acidic and basic aqueous suspensions. The structural and morphological transformations of nanotubes were studied by TEM, SEM, nitrogen adsorption, XRD Raman and FTIR spectroscopy accompanied by monitoring the concentration of dissolved Si(IV) and Al(III) in solution. It has been revealed that, in 1 mol dm−3 H2SO4 solution, the dissolution of halloysite is initiated on the inner surface of nanotubes, leading to the formation of amorphous spheroidal nanoparticles of SiO2 whereas, in 1 mol dm−3 NaOH solution, dissolution of the inner surface of nanotubes is accompanied by the formation of Al(OH)3 nanosheets. |
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ISSN: | 0957-4484 1361-6528 |
DOI: | 10.1088/0957-4484/23/6/065705 |