2.1.1. Materials

Cetyltrimethylammonium bromide (CTAB ≥ 98%), ammonium hydroxide solution (NH4OH), double distilled water (ddH2O), tetraethyl orthosilicate (TEOS), calcium nitrate tetrahydrate (Ca(NO3)2 · 4H2O, 99%), copper chloride (CuCl2, 99%), Pluronic P123 (EO20PO70EO20, Mn ∼5800 Da), ibuprofen (>98% GC), Trizma® base, primary standard and buffer, ≥99.9% (titration) were purchased from Sigma Aldrich, Milan, Italy and used as received. All solvents were purchased from Sigma Aldrich (Milan, Italy) in analytical grade.
