http://dspace.nbuv.gov.ua:80/handle/123456789/115113 2026-04-24T11:27:15Z http://dspace.nbuv.gov.ua:80/handle/123456789/118253 Cathodic corrosion: Part 2. Properties of nanoparticles synthesized by cathodic corrosion Yanson, A.I.; Yanson, Yu.I. We demonstrate how cathodic corrosion in concentrated aqueous solutions enables one to prepare nanoparticles of various metals and metal alloys. Using various characterization methods we show that the composition of nanoparticles remains that of the starting material, and the resulting size distribution remains rather narrow. For the case of platinum we show how the size and possibly even the shape of the nanoparticles can be easily controlled by the parameters of corrosion. Finally, we discuss the advantages of using the nanoparticles prepared by cathodic corrosion for applications in (electro-)catalysis. 2013-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/118252 Cathodic corrosion: Part 1. Mechanism of corrosion via formation of metal anions in aqueous medium Yanson, Yu.I.; Yanson, A.I. In this paper we describe an unusual electrochemical phenomenon, namely cathodic corrosion of platinum. We show that all existing models of cathodic corrosion are inconsistent with our experimental observations. Therefore, we present a new model of cathodic corrosion, which is based on the assumption that metal anions are formed at the electrode surface during the corrosion process. These anionic species function as precursors for the formation of the final product of cathodic corrosion–metal nanoparticles. 2013-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/118250 Electron tunneling into surface states through an inhomogeneous barrier: asymptotically exact solution of the problem and STM theory Khotkevych, N.V.; Kolesnichenko, Yu.A.; van Ruitenbeek, J.M. We have found an asymptotically exact solution of the Schrödinger equation for electrons tunneling into surface states through an inhomogeneous barrier of large amplitude. Assuming an elliptic dispersion law for the charge carriers the “standing wave” pattern in the conductance of the system resulting from the electron scattering by a single defect in the vicinity of the surface is analyzed. 2013-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/118248 Macroscopic quantum tunneling and retrapping processes in moderately damped YBaCuO Josephson junctions Massarotti, D.; Longobardi, L.; Galletti, L.; Stornaiuolo, D.; Rotoli, G.; Tafuri, F. The moderately damped regime in a Josephson junction (JJ) is quite common in devices characterized by low critical currents and therefore by low Josephson energies. Measurements of switching current distribution (SCD) are a direct way of discriminating the phase dynamics also in the nontrivial case of moderate damping, which is going to be more and more common with advances in nanopatterning superconductors and in materials science finalized to build hybrid systems. We report on measurements of SCDs, both in thermal and quantum regime, on moderately damped YBaCuO grain boundary biepitaxial JJs. A direct transition from phase diffusion regime to macroscopic quantum tunnelling occurs at about 130 mK. The crossover to the quantum regime is tuned by the magnetic field and phase dynamics is described by a fully consistent set of junction parameters derived through numerical simulations. 2013-01-01T00:00:00Z