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    Interfacial behavior of core-shell composite nanoparticles under compression and shear: Influence of polymer shell thickness

    Year: 2022

    Journal: J. Colloid Interface Sci., Volume 613, MAY, page 827–835

    Authors: Yu, Kai; Zhang, Huagui; Tangparitkul, Suparit; Jiang, Jiatong; Hodges, Chris; Harbottle, David

    Organizations: Natural Science Foundation of Jiangsu Province [BK20210759]; China Postdoctoral Science Foundation [2020M681506]; Senior Talent Foundation of Jiangsu University [19JDG029]; Opening Fund of State Key Laboratory of Heavy Oil Processing [SKLOP202001001]

    Keywords: Polymer-coated particles; Interfacial shear rheology; Particle-laden interfaces; Harbottle)

    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 particleladen 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. (c) 2022 Elsevier Inc. All rights reserved.
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