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Tomashpolskii Y.Y.,Karpov Physicochemical Institute | Sadovskaya N.V.,Karpov Physicochemical Institute
Journal of Surface Investigation | Year: 2010

The morphological features of the surface nanostructure of lead titanate crystals and lead zirconate titanate ceramics formed due to thermally stimulated surface self-segregation were studied by atomicforce microscopy, Auger electron spectrometry, and reflection high-energy electron diffraction. It was experimentally found that oriented ensembles of titanium dioxide nanoparticles 10-50 nm in size appear on the lead titanate single crystal surface at a certain temperature. A possible mechanism of the detected phenomenon is discussed, which is a new type of epitaxy via selective internal mass transfer of proper atoms from the substrate to the surface. © 2010 Pleiades Publishing, Ltd. Source

Tovbin Yu.K.,Karpov Physicochemical Institute | Rabinovich A.B.,Karpov Physicochemical Institute
Russian Journal of Physical Chemistry A | Year: 2011

The molecular theory of curved vapor-liquid interfaces within the lattice gas model is applied to analyze supersaturated vapor states in dependence on the new phase size and system temperature. The molecular interaction is considered in the quasi-chemical approximation which describes effects of direct correlations of the nearest molecules. Two methods for determining the surface tension are discussed: equimolecular and according to the surface tension minimum in the intermediate region, i.e., on the tension surface. It is shown that a tension surface exists for metastable drops in supersaturated vapor over the temperature range, but its use leads to multivaluedness of solutions for its position; the minimum range of the existence of metastable drops is close to the previously determined lower limit for equilibrium. © 2011 Pleiades Publishing, Ltd. Source

Soderzhinova M.M.,Karpov Physicochemical Institute | Tarasova D.V.,Karpov Physicochemical Institute | Chibirova F.Kh.,Karpov Physicochemical Institute
Russian Journal of Inorganic Chemistry | Year: 2014

0.0021-0.44 M TiO2 hydrosols have been prepared by an ultrasound-assisted method using titania hydrogel precipitated from TiCl 4 solution. The hydrosols contain amorphous primary titania particles 5 nm in size, combined into aggregations having average sizes of 22-51 nm. © 2014 Pleiades Publishing, Ltd. Source

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