Thermochemistry of hydride and phenyl groups on the surface of amorphous silicon dioxide

Silica hydride intermediate for octadecylsilica and phenyl bonded phase preparation via heterogeneous hydrosilation in supercritical carbon dioxide

“…43% of surface silanols (Si-OH) to silica hydride (Si-H) based on silanol content of native silica of 8.0 ± 1.0 mol/m 2 . Typical monomeric silica bonded phases yield a silanol conversion efficiency of no greater than 40-50% [31]. From the series of studies carried out here using DMMS and from our previous work with DMES [32], the silanol conversion efficiency achieved for sc-CO 2 generated silica hydride intermediate is comparable, and indeed superior (for certain silica materials) to those obtained using organic solvent based methods (Table 1).…”