surface of particles (3). Also, disperse silica (SiO 2 ) and A new method for the determination of the adsorption energy alumina (Al 2 O 3 ) are important as adsorbents and chromatodistribution of water molecules on disperse silica and alumina surgraphic packings (4-6). It has been shown recently that faces is presented. This method takes into account interactions such disperse materials are essential for technological adbetween the surface and hydrated uranyl (UO 2/ 2 ) groups, which vances in photonics, quantum electronics, nonlinear optics, are luminescent probes. Changes in the spectroscopic characterisand information storage and processing (7-15).
tics of uranyl ions, measured under selective laser excitation, have
The surfaces of these materials as well as of many other been used to evaluate the adsorption activity of different surface disperse materials used in science and technology are in sites. The adsorption energy distributions of water molecules, which general energetically heterogeneous, where the heterogenecoordinate the UO 2/ 2 ions in the equatorial plane, were evaluated for disperse inorganic oxides on the basis of luminescence measure-ity can be attributed to the differentiated surface and strucments and were compared with the energy distribution curves caltural properties. The performance of disperse silica and aluculated from nitrogen adsorption at 77.35 K, which is the standard mina in various applications is highly dependent on the type technique for the characterization of porous materials. In addition, of adsorption sites present on their surfaces. The active surhigh-resolution thermogravimetric measurements were performed face sites can include atoms regularly present on the surface, to supplement information about surface properties of the materials specific functional groups, impurities, and structural defects studied. The differences in the nature of adsorption interactions (16). These sites can have different magnitudes of electric for nitrogen and water probe molecules are discussed in context charge associated with them, which is a very important factor of their impact on the shape of the resulting adsorption energy in the interaction of the surface with polar molecules such distributions. The low-energy and high-energy parts of these distrias water.
butions were attributed to the physically and chemically adsorbed water molecules, respectively.