Quantitative ²⁹Si NMR Spectroscopy of Ordered Mesoporous Silicas: Revisiting Q₃/Q₄ Ratios and Surface Hydroxylation in SBA-15 and MCM-41

Key Points

• This research aims to refine the quantitative understanding of Q3/Q4 ratios and surface hydroxylation in specific silica structures.
• Utilized ²⁹Si NMR spectroscopy for analysis
• Focused on ordered mesoporous silicas known as SBA-15 and MCM-41
• Quantitative assessments of Q3 and Q4 silicon environments
• Revised Q3/Q4 ratios were reported for both SBA-15 and MCM-41
• Insights into the extent of surface hydroxylation were provided
• Clarified structural differences and implications for reactivity