Figure 4.
29Si CP-MAS NMR spectrum of SAB. Peaks at −110, −101, −91, −68, and −58 ppm were assigned to the Q4 (Si(OSi)4), Q3 (Si(OH)(OSi)3), Q2 (Si(OH)2(OSi)2), T3 (SiR(OSi)3), and T2 (Si(OH)R(OSi)2) sites, respectively.
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