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, 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
ISSNs: 0957-4484 (print)
1361-6528 (electronic)
Related URLs:
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
T Technology > TP Chemical technology
Divisions: Faculty of Engineering and the Environment > Engineering Sciences > Engineering Materials Surface Engineering
ePrint ID: 208351
Date Deposited: 18 Jan 2012 15:15
Last Modified: 27 Mar 2014 19:49
Projects:
The hydrothermal route to metal oxide nanotubes: synthesis and energy conversion application. A First Grant Proposal
Funded by: EPSRC (EP/F044445/1)
Led by: Dmitry V. Bavykin
15 September 2008 to 14 September 2010
URI: http://eprints.soton.ac.uk/id/eprint/208351

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