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Effect of particle interactions on the assembly of drying colloidal mixtures

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journal contribution
posted on 13.05.2022, 14:57 by James TinklerJames Tinkler, Alberto Scacchi, Maialen Argaiz, Radmila Tomovska, Andrew ArcherAndrew Archer, Helen WillcockHelen Willcock, Nacho Martin-Fabiani-CarratoNacho Martin-Fabiani-Carrato

The effects of particle interactions on the size segregation and assembly of colloidal mixtures during drying were investigated. A cationic surfactant was added to a binary latex/silica colloidal dispersion that has been shown to self-stratify upon drying at room temperature. Atomic force microscopy was used to show that the change in particle interactions due to the presence of surfactants reduced the degree of stratification and, in some cases, suppressed the effect altogether. Colloidal dispersions containing higher surfactant concentrations can undergo a complete morphology change, resulting instead in the formation of armored particles consisting of latex particles coated with smaller silica nanoparticles. To further prove that armored particles are produced and that stratification is suppressed, cross-sectional images were produced with energy-dispersive X-ray spectroscopy and confocal fluorescence microscopy. The growth of armored particles was also measured using dynamic light scattering. To complement this research, Brownian dynamics simulations were used to model the drying. By tuning the particle interactions to make them more attractive, the simulations showed the presence of armored particles, and the size segregation process was hindered. The prevention of segregation also results in enhanced transparency of the colloidal films. Overall, this research proves that there is a link between particle interactions and size segregation in drying colloidal blends and provides a valuable tool to control the assembly of different film architectures using an extremely simple method.

Funding

Integrated atomic force and confocal fluorescence lifetime imaging microscope with fibre-coupled infrared detector for materials research

Engineering and Physical Sciences Research Council

Find out more...

DTP studentship

UK Research and Innovation Future Leaders Fellowship (MP/T02061X/1)

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering
  • Science

Department

  • Materials
  • Mathematical Sciences

Published in

Langmuir

Volume

38

Issue

18

Pages

5361-5371

Publisher

American Chemical Society (ACS)

Version

VoR (Version of Record)

Rights holder

© American Chemical Society

Publisher statement

This is an Open Access Article. It is published by American Chemical Society under the Creative Commons Attribution 4.0 International Licence (CC BY 4.0). Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/

Publication date

2022-04-19

Copyright date

2022

ISSN

0743-7463

eISSN

1520-5827

Language

en

Depositor

Dr Nacho Martin-Fabiani Carrato. Deposit date: 27 April 2022