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