Abstract
The surface vibrational properties of sol–gel synthesized porous silica are investigated as a function of sample porosity. By considering the Raman contribution of the physisorbed water, the analysis of the fundamental O–H stretching range (3000–3800 cm −1 ) displays the vibrational modes related to Si–OH species on the surface of the porous matrix. The sample porosity affects the H-bonding interaction between OH-related groups and influences the hydrophilic character of the surface: a curvature effect can be hypothesized.
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