Formation and destruction of polyelectrolyte microcapsules modified by rhodamine 6G

Polyelectrolyte capsules with Rhodamine 6G molecules included into the shell are obtained in this work. The inclusion of dye molecules into the shell can provide the destruction of capsules by photosensitization. Measurements of the dye fluorescence intensity in the shell show that the energy of photoexcited molecules is effectively dissipated by the surrounding organic matrix. The capsule suspension is laser irradiated in the absorption band of Rhodamine 6G molecules. Measurements of the size distribution of capsules before and after laser irradiation reveal that the capsules are destroyed by laser illumination.     

An analog to Kamenkov’s critical stability case for nonstationary systems of impulsive differential equations

A new approach to the investigation of the stability of nonlinear nonautonomous differential equations with impulse effects in critical cases is proposed. The approach is based on the direct method of Lyapunov with the use of piecewise differentiable functions. The sufficient conditions of the asymptotic stability of the critical position of equilibrium in one case are obtained. The case is analogous to Kamenkov’s critical case.     

Bain strain upon thermoelastic martensitic transformation in intermetallic compounds based on titanium nickelide

Analysis of our original results and the data in the literature on the behavior of structural parameters of the austenitic and martensitic phases near phase transitions in alloys of the TiNi-TiMe (Me = Au, Pd, Pt, Rh, Cu, Co, Fe, Rh) system has been performed. It is established that the Bain strain and dilatation changes depend on the martensitic transformation “channel.”     

Electronic and magnetic properties of quasifreestanding graphene on Ni

For the purpose of recovering the intriguing electronic properties of freestanding graphene at a solid surface, graphene self-organized on a Au monolayer on Ni(111) is prepared and characterized by scanning tunneling microscopy. Angle-resolved photoemission reveals a gapless linear pi-band dispersion near K[over] as a fingerprint of strictly monolayer graphene and a Dirac crossing energy equal to the Fermi energy (EF) within 25 meV meaning charge neutrality. Spin resolution shows a Rashba effect on the pi states with a large (approximately 13 meV) spin-orbit splitting up to EF which is independent of k.     

Temperature Dependence of Selective Emission Intensity of the R1 Line upon Laser–Thermal Heating of Ruby

Optics and Spectroscopy - The temperature dependence of the selective emission intensity of the R1 line upon laser-thermal heating of ruby is studied and explained by competition of radiative and...     

Crystal-Chemical Approach to the Determination of Oxo-Centered Complexes in Divalent Lead Silicates

Crystallography Reports - The crystal-chemical analysis of seven structures of synthetic and natural lead silicates with formulas Pb2SiO4, Pb11Si3O17, Pb3Si2O7,...