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Time-resolved fluorescence-upconversion spectroscopy has been used to study the polar solvation dynamics of H 2 O and D 2 O at the surface of zirconia (ZrO 2 ) nanoparticles. While an isotope effect is observed for the solvation dynamics of bulk D 2 O, there is no isotope effect on the interfacial solvation dynamics. The interfacial solvation dynamics are the same for H 2 O and D 2 O and are faster than the bulk solutions. The bulk isotope effect is due to stronger hydrogen bonding in D 2 O compared to H 2 O, slowing the reorientation of the excited-state dipoles in the bulk D 2 O. The lack of isotope effect for the interfacial dynamics is explained in terms of the solvent interacting with the ZrO 2 surface.
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Pant et al. (1999) studied this question.
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