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Fine tuning of surface properties of SiO2 nanoparticles for the regulation of Pickering emulsions

Fine tuning of surface properties of SiO2 nanoparticles for the regulation of Pickering emulsions
Fine tuning of surface properties of SiO2 nanoparticles for the regulation of Pickering emulsions
Pickering emulsions hold great potential in solving the mass transfer limitation in gas-liquid-solid and/or liquid-liquid-solid multiphase systems. In the present study, the surface properties of SiO2 nanoparticles were finely tuned by a novel large-scale production method, which determined the final geometry of the dispersed droplets and their stability. By controlling the amount of KH-570 grafted on the nanoparticles surface the phase inversion of Pickering emulsions was regulated. The addition of stabilizing nanoparticles, the particle size, and the amount of dispersed phase all significantly affected the geometry and stability of the dispersed droplets, mainly attributed to the varying coverage area of dispersed droplets provided by the stabilizing particles at varying grafting degrees. Mechanistic investigation suggested that estimating the value of the solid-oil intermolecular energy provided an indicator measure to predict the type of Pickering emulsions, while the estimate of interfacial tension values gave an additional measure to determine the amount of solid particles needed for forming stable Pickering emulsions.
Pickering; Emulsion; SiO2 particles; Surface modification; KH-570; Stability
0927-7757
Meng, Yan
ff7ae3ed-f861-432b-8f6a-916564a19ea8
Sun, Wenxing
0349c9bd-2368-4dab-8f07-3b4724bb9627
Yang, Hao
6cdeb7bb-81d1-4a45-b3a0-0f0190c01a8a
Wang, Wei
6fa4c281-9aaa-4c6a-a6ca-cf32b94af47e
Jin, Nan
6d36c663-e736-48c4-bc59-d035d25fe011
Zhao, Yuchao
a8d6b3c0-f257-40da-be3d-fa9a56d2be29
Zhang, Xunli
d7cf1181-3276-4da1-9150-e212b333abb1
Lü, Hongying
719c9aea-448f-40ee-ab59-e6abf1e1b1fb
Meng, Yan
ff7ae3ed-f861-432b-8f6a-916564a19ea8
Sun, Wenxing
0349c9bd-2368-4dab-8f07-3b4724bb9627
Yang, Hao
6cdeb7bb-81d1-4a45-b3a0-0f0190c01a8a
Wang, Wei
6fa4c281-9aaa-4c6a-a6ca-cf32b94af47e
Jin, Nan
6d36c663-e736-48c4-bc59-d035d25fe011
Zhao, Yuchao
a8d6b3c0-f257-40da-be3d-fa9a56d2be29
Zhang, Xunli
d7cf1181-3276-4da1-9150-e212b333abb1
Lü, Hongying
719c9aea-448f-40ee-ab59-e6abf1e1b1fb

Meng, Yan, Sun, Wenxing, Yang, Hao, Wang, Wei, Jin, Nan, Zhao, Yuchao, Zhang, Xunli and Lü, Hongying (2020) Fine tuning of surface properties of SiO2 nanoparticles for the regulation of Pickering emulsions. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 592, [124603]. (doi:10.1016/j.colsurfa.2020.124603).

Record type: Article

Abstract

Pickering emulsions hold great potential in solving the mass transfer limitation in gas-liquid-solid and/or liquid-liquid-solid multiphase systems. In the present study, the surface properties of SiO2 nanoparticles were finely tuned by a novel large-scale production method, which determined the final geometry of the dispersed droplets and their stability. By controlling the amount of KH-570 grafted on the nanoparticles surface the phase inversion of Pickering emulsions was regulated. The addition of stabilizing nanoparticles, the particle size, and the amount of dispersed phase all significantly affected the geometry and stability of the dispersed droplets, mainly attributed to the varying coverage area of dispersed droplets provided by the stabilizing particles at varying grafting degrees. Mechanistic investigation suggested that estimating the value of the solid-oil intermolecular energy provided an indicator measure to predict the type of Pickering emulsions, while the estimate of interfacial tension values gave an additional measure to determine the amount of solid particles needed for forming stable Pickering emulsions.

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Pre-proof Finr tuning of surface Meng2020 - Accepted Manuscript
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More information

Accepted/In Press date: 14 February 2020
e-pub ahead of print date: 14 February 2020
Published date: 5 May 2020
Keywords: Pickering; Emulsion; SiO2 particles; Surface modification; KH-570; Stability

Identifiers

Local EPrints ID: 438140
URI: http://eprints.soton.ac.uk/id/eprint/438140
ISSN: 0927-7757
PURE UUID: 596f9aaf-a306-415f-a77b-13d1af37eb4f
ORCID for Xunli Zhang: ORCID iD orcid.org/0000-0002-4375-1571

Catalogue record

Date deposited: 03 Mar 2020 17:30
Last modified: 22 Nov 2021 08:02

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Contributors

Author: Yan Meng
Author: Wenxing Sun
Author: Hao Yang
Author: Wei Wang
Author: Nan Jin
Author: Yuchao Zhao
Author: Xunli Zhang ORCID iD
Author: Hongying Lü

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