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(Color online) FTIR spectra of F38-TEOS and m-F38-TEOS.
(Color online) (a) Positron lifetime spectra of F38-TEOS and m-F38-TEOS and (b) o-Ps lifetime distributions in mesopores.
(Color online) (a) Variations of o-Ps lifetimes in mesoporous silica films upon surface trimethylsilylation. The open circles correspond to lifetime changes vs pore sizes for the unmodified films prepared with P103, F38, F88, and F127. The dashed and solid curves are the simulated variations of o-Ps lifetimes upon the surface modification versus the pore sizes of unmodified films under assumptions of cubic and rectangular pores, respectively. In the simulation, the electron layer thickness of the modified films and the pore size reduction by the surface modification were assumed 0.15 and , respectively. (b) Variations of o-Ps intensities in mesoporous silica films upon surface trimethylsilylation.
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