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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Bibliographic Details
Published inNanotechnology Vol. 23; no. 6; pp. 065705 - 1-10
Main Authors White, Rachel D, Bavykin, Dmitry V, Walsh, Frank C
Format Journal Article
LanguageEnglish
Published England IOP Publishing 17.02.2012
Subjects
Acids - chemistry
Alkalies - chemistry
Aluminum Silicates - chemistry
Dissolution
Monitoring
Nanocomposites
Nanomaterials
Nanostructure
Nanotubes
Nanotubes - chemistry
Nanotubes - ultrastructure
Stability
Surface chemistry
Suspensions
Water - chemistry
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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