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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
(a) SEM image of the MOW end face; (b–d) magnified SEM images of the capillaries with one, two, and three deposited layers of 300-nm silica particles, respectively.