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Foam drainage on thick porous substrate

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journal contribution
posted on 17.11.2017 by Toby Armstrong, Hannah Smith, Omid Arjmandi-Tash, Jennifer Cook, Anna Trybala, Victor Starov
The use of foam-based applications as a method of drug delivery represents a recent and promising area of research. The interaction of foam and porous substrates have been recently theoretically described using a mathematical model, which combines the equation of foam drainage with that of imbibition of liquid into the porous substrate. Below the drainage of foam placed on chalk experimentally investigated to verify the theory prediction. The surfactants sodium dodecyl sulfate (SDS) and Triton X-100 were used to form a foam. The initial liquid volume fractions of the foam were found to be ranging in between 14.12 and 16.46%. The porosity and permeability of the chalk substrate were experimentally obtained at 59.1% and 3.122.10 -11 m 2 respectively. The height of foam deposited onto the thick porous substrate (chalk) was 2.5 cm and 6 cm. The imbibition into the chalk, the height of foam, and the bubble size within the foam were monitored. The latter enabled the kinetics of the drainage/imbibition to be determined and compared with the predictions according to the theoretical model. The rate of decrease in foam height was initially high and decreased over time as predicted by the theoretical model. All the foam displayed an initial rapid imbibition through the porous substrate, which is again in the agreement with the theory predictions. It was found that solutions with lower surfactant concentrations could penetrate deeper into the chalk. The imbibition front was observed to be uniform: evenly distributed liquid throughout the cross-section of the porous substrate.

Funding

This research was supported by CoWet, Marie Curie, EU grant and MAP EVAPORATION project, European Space Agency.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

Physicochemical Problems of Mineral Processing

Volume

54

Issue

1

Pages

193 - 202

Citation

ARMSTRONG, T. ... et al, 2017. Foam drainage on thick porous substrate. Physicochemical Problems of Mineral Processing, 54 (1), pp. 193-202.

Publisher

© Wroclaw University of Science and Technology

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2017

Notes

This paper is open access.

ISSN

1643-1049

eISSN

2084-4735

Language

en

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