Yu, K, Zhang, H, Tangparitkul, S et al. (3 more authors) (2022) Interfacial behavior of core–shell composite nanoparticles under compression and shear: Influence of polymer shell thickness. Journal of Colloid and Interface Science, 613. pp. 827-835. ISSN 1095-7103
Abstract
Hypothesis
The mobility of core–shell nanoparticles partitioned at an air–water interface is strongly governed by the compliance of the polymer shell.
Experiments
The compressional, relaxation and shear responses of two polymer-coated silica nanoparticles (CPs) were studied using a Langmuir trough and needle interfacial shear rheometer, and the corresponding structures of the particle-laden interfaces were visualized using Brewster angle and scanning electron microscopy.
Findings
The mobility of CPs partitioned at an air–water interface correlates to the polymer MW. In compression, the CPs40-laden interface (silica nanoparticles coated with 40 kDa PVP) showed distinct gas–liquid-solid phase transitions and when the surface pressure was reduced, the compressed particle-laden interface relaxed to its original state. The compressed-state of the CPs8-laden interface did not relax, and wrinkles in the particle-laden film that had formed in compression remained due to greater adhesion between the compressed particles. The increased mobility of the CPs40-laden interface translated to lower surface shear moduli, with the viscoelastic moduli an order of magnitude or more lower in the CPs40-laden interface than the CPs8-laden interface. Ultimately this contributed to changing the stability of particle-stabilized foams, with less mobile interfaces providing improved foam stability.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2022 Elsevier Inc. All rights reserved. This is an author produced version of an article, published in Journal of Colloid and Interface Science. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Polymer-coated particles; Interfacial shear rheology; Particle-laden interfaces |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 15 Mar 2022 10:13 |
Last Modified: | 11 Jan 2023 01:13 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.jcis.2022.01.069 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:184679 |
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