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Influence of aqueous environment on agglomeration and dissolution of thiol-functionalised mesoporous silica-coated magnetite nanoparticles

Influence of aqueous environment on agglomeration and dissolution of thiol-functionalised mesoporous silica-coated magnetite nanoparticles
Influence of aqueous environment on agglomeration and dissolution of thiol-functionalised mesoporous silica-coated magnetite nanoparticles
The purpose of the present research work is to investigate the stability and dissolution of magnetite (Fe3O4) nanoparticles (NPs) and thiol-functionalised mesoporous silica coated magnetite NPs (TF-SCMNPs). The state of NPs in an aqueous environment was investigated under different pH conditions. Changes in the NPs’ mean diameter due to aggregation were measured over a specific time. The effects of contact time and pH on the dissolution of NPs were also investigated. In order to avoid possible aggregation, Fe3O4 NPs were coated with silica and functionalised further with thiol organic groups. These methods imparted excellent stability to magnetite NPs in an aqueous medium over a wide range of pH values with reasonable hydrodynamic size. The organic group bound magnetite NPs allowed these particles to circulate over a long time in the aqueous system, and particle aggregation and sedimentation did not occur. The trend of decreasing zeta potential was observed after grafting thiol onto the surface of the SCMNPs. The results also revealed that silica exhibited a noteworthy efficient in eliminating the pH dependence and enhancing the NP stability of SCMNPs and SH-SCMNPs in aqueous medium. On the other hand, the dissolution of Fe3O4 NPs was found to be detrimental at pH 2.0 and 4.0 or had a long contact time.
nanoparticles, magnetite, thiol, silica, agglomeration, dissolution, dynamic light scattering
0944-1344
Hakami, Othman
aca77a89-5fda-4553-851a-b88f479f0161
Zhang, Yue
69b11d32-d555-46e4-a333-88eee4628ae7
Banks, Charles J.
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Hakami, Othman
aca77a89-5fda-4553-851a-b88f479f0161
Zhang, Yue
69b11d32-d555-46e4-a333-88eee4628ae7
Banks, Charles J.
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f

Hakami, Othman, Zhang, Yue and Banks, Charles J. (2015) Influence of aqueous environment on agglomeration and dissolution of thiol-functionalised mesoporous silica-coated magnetite nanoparticles. Environmental Science and Pollution Research, 22 (5). (doi:10.1007/s11356-014-3085-3).

Record type: Article

Abstract

The purpose of the present research work is to investigate the stability and dissolution of magnetite (Fe3O4) nanoparticles (NPs) and thiol-functionalised mesoporous silica coated magnetite NPs (TF-SCMNPs). The state of NPs in an aqueous environment was investigated under different pH conditions. Changes in the NPs’ mean diameter due to aggregation were measured over a specific time. The effects of contact time and pH on the dissolution of NPs were also investigated. In order to avoid possible aggregation, Fe3O4 NPs were coated with silica and functionalised further with thiol organic groups. These methods imparted excellent stability to magnetite NPs in an aqueous medium over a wide range of pH values with reasonable hydrodynamic size. The organic group bound magnetite NPs allowed these particles to circulate over a long time in the aqueous system, and particle aggregation and sedimentation did not occur. The trend of decreasing zeta potential was observed after grafting thiol onto the surface of the SCMNPs. The results also revealed that silica exhibited a noteworthy efficient in eliminating the pH dependence and enhancing the NP stability of SCMNPs and SH-SCMNPs in aqueous medium. On the other hand, the dissolution of Fe3O4 NPs was found to be detrimental at pH 2.0 and 4.0 or had a long contact time.

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More information

e-pub ahead of print date: 6 June 2014
Published date: March 2015
Keywords: nanoparticles, magnetite, thiol, silica, agglomeration, dissolution, dynamic light scattering
Organisations: Water & Environmental Engineering Group

Identifiers

Local EPrints ID: 372291
URI: http://eprints.soton.ac.uk/id/eprint/372291
ISSN: 0944-1344
PURE UUID: 249ec402-f734-44a4-9d12-119fc959b78d
ORCID for Yue Zhang: ORCID iD orcid.org/0000-0002-5068-2260
ORCID for Charles J. Banks: ORCID iD orcid.org/0000-0001-6795-814X

Catalogue record

Date deposited: 09 Dec 2014 15:02
Last modified: 15 Mar 2024 03:15

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Contributors

Author: Othman Hakami
Author: Yue Zhang ORCID iD

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