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The stability of halloysite nanotubes in acidic and alkaline aqueous suspensions

The stability of halloysite nanotubes in acidic and alkaline aqueous suspensions
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 ºC) 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 formation of amorphous spheroidal nanoparticles of SiO2 whereas, in 1 mol dm-3 NaOH solution, dissolution of inner surface of nanotubes is accompanied by formation of Al(OH)3 nanosheets.
0957-4484
065705-065715
White, Rachel D.
f5f9f0e7-a256-4714-b752-e3bb8dab03fc
Bavykin, Dmitry V.
1e9fabfc-d078-4585-876f-85ff33b7eed5
Walsh, F.C.
309528e7-062e-439b-af40-9309bc91efb2
White, Rachel D.
f5f9f0e7-a256-4714-b752-e3bb8dab03fc
Bavykin, Dmitry V.
1e9fabfc-d078-4585-876f-85ff33b7eed5
Walsh, F.C.
309528e7-062e-439b-af40-9309bc91efb2

White, Rachel D., Bavykin, Dmitry V. and Walsh, F.C. (2012) The stability of halloysite nanotubes in acidic and alkaline aqueous suspensions. Nanotechnology, 23 (6), 065705-065715. (doi:10.1088/0957-4484/23/6/065705).

Record type: Article

Abstract

The long term stability of natural halloysite nanotubes was studied at room temperature (22 ± 2 ºC) 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 formation of amorphous spheroidal nanoparticles of SiO2 whereas, in 1 mol dm-3 NaOH solution, dissolution of inner surface of nanotubes is accompanied by formation of Al(OH)3 nanosheets.

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e-pub ahead of print date: 17 January 2012
Published date: 17 February 2012
Organisations: Engineering Mats & Surface Engineerg Gp

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Local EPrints ID: 208351
URI: http://eprints.soton.ac.uk/id/eprint/208351
ISSN: 0957-4484
PURE UUID: 1acd65ca-c86b-41cd-8baa-6fbd319ac858

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Date deposited: 18 Jan 2012 15:15
Last modified: 14 Mar 2024 04:43

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