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The XRD patterns of empty functionalized microparticles pSi-C12, pSi-COOH, and pSiO2-C8; drug-loaded functionalized microparticles pSi-C12-RAP, pSi-COOH-RAP, and pSiO2-C8-RAP; and crystalline RAP. The XRD data were recorded in the 2θ range (5–75°).
