Figure 3 | Scientific Reports

Figure 3

From: Controlled biocide release from hierarchically-structured biogenic silica: surface chemistry to tune release rate and responsiveness

Figure 3

FTIR spectra of the biogenic silica carriers (a) and prepared BDS (b). C1s high-resolution XPS spectra of the unmodified and modified particles (c) and the BSiO2-thymol based BDS (d) with detail of the apparent carbon composition at the BDS and carriers surface. Zeta potential measurements to verify the charge of the silica surface before (e) and after thymol loading (f) as a function of pH.

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