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Quantification of silanol sites for the most common mesoporous ordered silicas and organosilicas: total versus accessible silanols

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Abstract
IR and NMR spectroscopy were used to determine the silanol content in the most common mesoporous ordered silicas: MCM-41, MCM-48, SBA-15 and SBA-16. In addition, a spray dried MCM-41 and an ethene bridged PMO are investigated. The results are compared with a commercial chromatographic silica (Nucleosil). The complete distribution of surface and bulk silanols, and of isolated, geminal and vicinal silanols for all these materials is presented. A distinction is made between the total silanol number and the reachable or surface silanol content. The latter is determined by controlled reactions with simple silanes. All mesoporous ordered silicas, and especially the thick walled SBA-type materials and the PMO contain a surprisingly high amount of total silanol sites, albeit that up to 90% of these silanols are buried inside the walls and are not reachable for small silanes.
Keywords
HYDROXYL-GROUPS, SOLID-STATE NMR, SURFACE-CHEMISTRY, AMORPHOUS SILICA, FUMED SILICA, MCM-41, WATER, SI-29, ADSORPTION, THERMOGRAVIMETRY

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Citation

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Chicago
Ide, Matthias, Mohamad El-Roz, Els De Canck, Aurélie Vicente, Tom Planckaert, Thomas Bogaerts, Isabel Van Driessche, et al. 2013. “Quantification of Silanol Sites for the Most Common Mesoporous Ordered Silicas and Organosilicas: Total Versus Accessible Silanols.” Physical Chemistry Chemical Physics 15 (2): 642–650.
APA
Ide, Matthias, El-Roz, M., De Canck, E., Vicente, A., Planckaert, T., Bogaerts, T., Van Driessche, I., et al. (2013). Quantification of silanol sites for the most common mesoporous ordered silicas and organosilicas: total versus accessible silanols. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 15(2), 642–650.
Vancouver
1.
Ide M, El-Roz M, De Canck E, Vicente A, Planckaert T, Bogaerts T, et al. Quantification of silanol sites for the most common mesoporous ordered silicas and organosilicas: total versus accessible silanols. PHYSICAL CHEMISTRY CHEMICAL PHYSICS. 2013;15(2):642–50.
MLA
Ide, Matthias, Mohamad El-Roz, Els De Canck, et al. “Quantification of Silanol Sites for the Most Common Mesoporous Ordered Silicas and Organosilicas: Total Versus Accessible Silanols.” PHYSICAL CHEMISTRY CHEMICAL PHYSICS 15.2 (2013): 642–650. Print.
@article{3099351,
  abstract     = {IR and NMR spectroscopy were used to determine the silanol content in the most common mesoporous ordered silicas: MCM-41, MCM-48, SBA-15 and SBA-16. In addition, a spray dried MCM-41 and an ethene bridged PMO are investigated. The results are compared with a commercial chromatographic silica (Nucleosil). The complete distribution of surface and bulk silanols, and of isolated, geminal and vicinal silanols for all these materials is presented. A distinction is made between the total silanol number and the reachable or surface silanol content. The latter is determined by controlled reactions with simple silanes. All mesoporous ordered silicas, and especially the thick walled SBA-type materials and the PMO contain a surprisingly high amount of total silanol sites, albeit that up to 90\% of these silanols are buried inside the walls and are not reachable for small silanes.},
  author       = {Ide, Matthias and El-Roz, Mohamad and De Canck, Els and Vicente, Aur{\'e}lie and Planckaert, Tom and Bogaerts, Thomas and Van Driessche, Isabel and Lynen, Frederic and Van Speybroeck, Veronique and Thybault-Starzyk, Fr{\'e}d{\'e}ric and Van Der Voort, Pascal},
  issn         = {1463-9076},
  journal      = {PHYSICAL CHEMISTRY CHEMICAL PHYSICS},
  keyword      = {HYDROXYL-GROUPS,SOLID-STATE NMR,SURFACE-CHEMISTRY,AMORPHOUS SILICA,FUMED SILICA,MCM-41,WATER,SI-29,ADSORPTION,THERMOGRAVIMETRY},
  language     = {eng},
  number       = {2},
  pages        = {642--650},
  title        = {Quantification of silanol sites for the most common mesoporous ordered silicas and organosilicas: total versus accessible silanols},
  url          = {http://dx.doi.org/10.1039/C2CP42811C},
  volume       = {15},
  year         = {2013},
}

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