INS is an ideal means of probing the complete vibrational density of states of water adsorbed on the surface of metal oxide nanoparticles with minimal interference from the underlying particle. From the VDOS it is possible to calculate the isochoric heat capacity and vibrational entropy of the nanoparticle hydration layers. We propose to collect high-resolution TOSCA data over the 0-200meV energy range to enable us to evaluate the thermodynamic properties of water confined on the surface of porous alumina nanoparticles that are 3nm in size. We will collect data on four alumina samples with varying pore sizes (3, 10, 20 and 30nm) that have water contents up to 15 wt.-% and on a dehydrated alumina sample with 30nm pores. These data will permit us to study the influence of pore size on the thermodynamic properties of water confined on the surface of alumina nanoparticles.