Inaccessible hydroxyl groups on silica are accessible in supercritical CO2.

@article{Mccool2005InaccessibleHG,
  title={Inaccessible hydroxyl groups on silica are accessible in supercritical CO2.},
  author={Ben Mccool and Carl P. Tripp},
  journal={The journal of physical chemistry. B},
  year={2005},
  volume={109 18},
  pages={
          8914-9
        }
}
The three main types of hydroxyl groups on a silica surface are classified as isolated, hydrogen bonded, and inaccessible. The isolated and hydrogen bonded groups are the most important as these readily exchange with D(2)O and thus are exposed to reactant molecules. However, it has generally been accepted that the inaccessible groups do not participate in surface reactions as only a small fraction of these groups exchange with D(2)O. It is shown that the inaccessible hydroxyl groups on… CONTINUE READING

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