(A) Fourier transform infrared spectra of as-prepared pSi particles before chemical modification, and after functionalization with 1-dodecene (pSi-C12), undecylenic acid (pSi-COOH) and after silanization reaction with alkyl groups (pSiO2-C8). (B) Fourier transform infrared spectra of pSi particles after surface chemical modification and subsequent RAP loading (pSi-C12-RAP, pSi-COOH-RAP, and pSiO2-C8-RAP), as well as spectra of crystalline RAP. Group vibrational assignments are indicated in the text.