York, DW, Collins, S and Rantape, M (2019) Measuring the permeability of thin solid layers of natural waxes. Journal of Colloid and Interface Science, 551. pp. 270-282. ISSN 0001-8686
Abstract
Hypothesis:
Previous experimental work has shown that microcapsule walls, made by solidification of a molten wax, are unexpectedly permeable. The hypothesis was that this was due more to the structure of the wall than the material itself.
Experiments:
The permeability of thin (sub and low micron thickness) natural waxes was measured where a membrane was placed between two cells and the diffusion of a dye (fluorescein) measured. A filter paper was used to support the membranes. Two methods were used to coat the filter paper; simple dipping and spin coating. The resulting surfaces were examined using SEM, XRD and contact angle.
Findings:
Results indicate that the permeability of very thin walled capsules can be investigated by forming a layer on a porous support and measuring diffusion rates. Both the composition of the wax and the sample preparation is extremely important to the structure and resulting permeability of the membranes. Spin coating was much more effective than dip coating in reducing permeability. Carnauba wax had a much lower permeability than beeswax.
A difference in levels between the two cells was observed, indicating a potential Osmotic pressure difference at play which should be further investigated.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 Published by Elsevier Inc. This is an author produced version of a paper published in Advances in Colloid and Interface Science. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | diffusion; permeability; micro encapsulation; food additives; beeswax; carnauba wax |
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: | 17 Apr 2019 10:08 |
Last Modified: | 15 Apr 2020 00:38 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.jcis.2019.03.104 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:145122 |
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Filename: York et al Manuscript for publication Apr2019.pdf
Licence: CC-BY-NC-ND 4.0
Filename: York et al Supporting Information - for Publication Apr2019.pdf
Licence: CC-BY-NC-ND 4.0