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. 2024 Jun 7;14(3):20230073. doi: 10.1098/rsfs.2023.0073

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© 2024 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Optical pictures of transparency changes with the addition of mineral oil onto different fabrics and films (outline of the interface highlighted in red) — Optical pictures of transparency changes with the addition of mineral oil onto different fabrics and films (outline of the interface highlighted in red). (a) shows a PP mesh with thicker fibres and some thermally bonded areas, (b) shows a PP filter with much finer fibres and thicker structures for more scattering. (c) shows a nanoporous PE membrane. The PP filter which has no closed pores and high matching between mineral oil and PP index of refraction shows the largest clarity difference.