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. 2020 Apr 29;8:304. doi: 10.3389/fchem.2020.00304

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Copyright © 2020 Giuliani, Messina, Staccioli, Pascucci, Riccucci, Liotta, Tortora, Ingo and Di Carlo.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Molar concentrations of p-aminobenzoic acid (pAB) released from SiO₂-NPs-15–NH₂ after 3, 24, 48, and 144 h of immersion in neutral solution (black square) and in alkaline solution, pH 12.65 (red circle).