The rheology of polyvinylpyrrolidone-coated silica nanoparticles positioned at an air-aqueous interface

Yu, Kai, Zhang, Huagui, Biggs, Simon, Xu, Zhenghe, Cayre, Olivier J., and Harbottle, David (2018) The rheology of polyvinylpyrrolidone-coated silica nanoparticles positioned at an air-aqueous interface. Journal of Colloid and Interface Science, 527. pp. 346-355.

[img] PDF (Published Version) - Published Version
Restricted to Repository staff only

View at Publisher Website:


Particle-stabilized emulsions and foams are widely encountered, as such there remains a concerted effort to better understand the relationship between the particle network structure surrounding droplets and bubbles, and the rheology of the particle-stabilized interface. Poly(vinylpyrrolidone)-coated silica nanoparticles were used to stabilize foams. The shear rheology of planar particle-laden interfaces were measured using an interfacial shear rheometer and the rheological properties measured as a function of the sub-phase electrolyte concentration and surface pressure. All particle-laden interfaces exhibited a liquid-like to solid-like transition with increasing surface pressure. The surface pressure-dependent interfacial rheology was then correlated to the formed micron-scale structures of the particle-laden interfaces which were imaged using a Brewster angle microscope. With the baseline knowledge established, foams were prepared using the same composite particles and the particle network structure imaged using cryo-SEM. An attempt has been made to correlate the two structures observed at a planar interface and that surrounding a bubble to elucidate the likely rheology of the bubble stabilizing particle network. Independent of the sub-phase electrolyte concentration, the resulting rheology of the bubble stabilizing particle network was strongly elastic and appeared to be in a compression state at the region of the L-S phase transition.

Item ID: 73337
Item Type: Article (Research - C1)
ISSN: 1095-7103
Keywords: Interfacial shear rheology, Particle-stabilized foams, Polymer-coated particles
Copyright Information: © 2018 Elsevier Inc. All rights reserved.
Date Deposited: 25 Aug 2022 05:18
FoR Codes: 34 CHEMICAL SCIENCES > 3406 Physical chemistry > 340603 Colloid and surface chemistry @ 100%
SEO Codes: 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280105 Expanding knowledge in the chemical sciences @ 100%
Downloads: Total: 2
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page