The present finding deals with a simple and low-cost fabrication of surface-passivated, brightly fluorescent zincoxide- decorated, red-emitting excitation-independent ultrafluorescent CDs, denoted as “CZnO-Dots”. Surface doping of zinc oxide significantly improved the quantum yield by up to ∼72%, and these brightly fluorescent red-emitting CZnO-Dots have been employed for the aqueous-phase photoreduction of 100 ppm hexavalent chromium(VI) to trivalent chromium(III) under the influence of sunlight irradiation. The overall utility of the prepared CZnO-Dots can be ascertained by their recyclability over seven cycles.
The doped CD with inorganic salts can apparently form a newer platform among the existing class of fluorescent optical materials such as QDs and organic dyes. The doped-soluble CD with a higher quantum yield value can provide solutions to many newer emerging and existing problems. The aqueous solutions of red-emitting brightly fluorescent CZnO-Dots with excellent photostability could compete with the already existing commercially available QDs and organic dyes for similar types of applications. Such as related to the deeper penetration ability of the fluorescent probe could directly relate the excellence of instructive image analysis. Beyond these, brightly fluorescent CZnO-Dots do have the potential for use as an excellent photocatalytic material because of their working window, which is situated in the lower wavelength region. Interestingly, further studies could reveal a vast prospective future of these solublebrightly fluorescent CZnO-Dots in the field of photocatalysis and water treatment.

From the analysis of experimental X-ray absorption spectra and the calculation of atomic multiplets it is found that the grinding of powder manganites La0.5Ca0.5MnO3 and Nd0.5Sr0.5MnO3 in a vibration mill results in the formation of nanocrystallites and a partial transformation of trivalent manganese ions into tetravalent. It is shown that in nanostructured manganite La0.5Ca0.5MnO3 the energy gap between the occupied and unoccupied states is absent. It os found that Mn2+ ions arise in Nd0.5Sr0.5MnO3 due to more intense deformation during the grinding.

Broken inversion symmetry in magnetic nanostructures induces Dzyaloshinskii-Moriya couplings. In the presence of surfaces/interfaces the magnetism of magnetic nanodisks can be essentially affected by these chiral couplings. Within a micromagnetic approach we calculate the equilibrium sizes and shape of the vortices as functions of magnetic field, the material, and the geometrical parameters of nanodisks. It was found that the Dzyaloshinskii-Moriya coupling can considerably increase sizes of vortices with “right” chirality and suppress vortices with opposite chirality. This allows to form a bistable system of vortices with the same chirality as a basic element for storage applications.
Phys. Rev. B 80, 134410 (2009)

Аномальные фибриллы являются перспективным объектом для создания материалов, структурированных «снизу-вверх». Такие фибриллы способны к самосборке и обладают высокой устойчивостью к внешгим воздействиям. При компьютерном анализе последовательностей природных фибриллогенных пептидов а также с помощью моделирования пространственной структуры был выбран пептид, потенциально способный к образованию фибрилл с регулируемыми пространственными параметрами. Такой пептид был синтезирован. Найдены условия для образования фибрилл с оптимальными пространственными параметрами. Создан экспериментальный образец наноструктурированного материала на основе таких фибрилл.
Инновации,06(116),с.84-87, 2008