The stability of halloysite nanotubes in acidic and alkaline aqueous suspensions


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).

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Description/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.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1088/0957-4484/23/6/065705
ISSNs: 0957-4484 (print)
Subjects:
Organisations: Engineering Mats & Surface Engineerg Gp
ePrint ID: 208351
Date :
Date Event
17 January 2012e-pub ahead of print
17 February 2012Published
Date Deposited: 18 Jan 2012 15:15
Last Modified: 18 Apr 2017 00:33
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/208351

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