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. 2021 Apr 9;14(8):1880. doi: 10.3390/ma14081880

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© 2021 by the authors.

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 (https://creativecommons.org/licenses/by/4.0/).

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Particle size distribution of SBA-15 samples after (a) surface modification with PEI and (b) diclofenac sodium loading in logarithmic scale determined by photon cross-correlation spectroscopy.