Charge Transfer Mechanism in Type II WO/CuO Heterostructure.

In this study, we explore the charge transfer mechanism between WO and CuO in heterostructured WO/CuO electrodes and in a WO||CuO tandem photoelectrochemical cell. The physical-chemical characterizations of the individual WO and CuO electrodes and the heterostructured WO/CuO electrode by XRD, XPS, and SEM methods confirm the successful formation of the target systems. The results of photoelectrochemical studies infer that in both the heterostructured WO/CuO electrode and WO||CuO tandem photoelectrochemical cell, the major mechanism of charge transfer between WO and CuO is a realization of the Z-scheme.

Antibacterial and Osteogenic Properties of Ag Nanoparticles and Ag/TiO Nanostructures Prepared by Atomic Layer Deposition.

The combination of titania nanofilms and silver nanoparticles (NPs) is a very promising material, with antibacterial and osseointegration-induced properties for titanium implant coatings. In this work, we successfully prepared TiO nanolayer/Ag NP structures on titanium disks using atomic layer deposition (ALD). The samples were studied by scanning electron microscopy (SEM), X-ray diffraction, X-ray photoelectron spectroscopy (XPS), contact angle measurements, and SEM-EDS.

Surface Modification of Additively Manufactured Nitinol by Wet Chemical Etching.

Three-dimensional printed nitinol (NiTi) alloys have broad prospects for application in medicine due to their unique mechanical properties (shape memory effect and superplasticity) and the possibilities of additive technologies. However, in addition to mechanical properties, specific physicochemical characteristics of the surface are necessary for successful medical applications. In this work, a comparative study of additively manufactured (AM) NiTi samples etched in HSO/HO, HCl/HSO and NHOH/HO mixtures was performed.

Effect of CuO Substrate on Photoinduced Hydrophilicity of TiO and ZnO Nanocoatings.

The effect of a CuO substrate on the photoinduced alteration of the hydrophilicity of TiO and ZnO surfaces was studied. It was demonstrated that the formation of heterostructures CuO/TiO and CuO/ZnO strongly changed the direction of the photoinduced alteration of surface hydrophilicity: while both TiO and ZnO demonstrate surface transition to superhydrophilic state under UV irradiation and no significant alteration of the surface hydrophilicity under visible light irradiation, the formation of CuO/TiO and CuO/ZnO heterostructures resulted in photoinduced decay of the surface hydrophilicity caused by both UV and visible light irradiation. All observed photoinduced changes of the surface hydrophilicity were compared and analyzed in terms of photoinduced alteration of the surface free energy and its polar and dispersive components.

Spectroscopic studies of ozone in cryosolutions: FT-IR spectra of O in liquid nitrogen, oxygen, argon and krypton.

We have measured and interpreted the IR spectra of ozone dissolved in liquid nitrogen, oxygen, argon, and krypton in the 650-4700cm spectral region at 79-117K. Frequency shifts, band intensities and bandshapes of 22 spectral features of soluted ozone were analyzed. The bands of the А symmetry have a complex contour and possess an excess intensity with respect to the value of the purely vibrational transition moment.

Photoinduced hydrophilic conversion of hydrated ZnO surfaces.

Here we focused on the study of the effect of the zinc oxide nano-coatings surface acidity on the surface hydrophilicity and photoinduced hydrophilic conversion. A three-step procedure was used to have the initial state of the ZnO surface free of organics and to control the conditions during the water wetting and the irradiation steps. The kinetics of photoinduced hydrophilic conversions for ZnO films were obtained and demonstrated a dependence on the initial hydrophilic state.

IR spectroscopic testing of surfaces in water ice and in icy mixtures with prussic acid or ammonia.

An experimental technique is developed for spectral studies of ice films deposited at 77 K onto the ZnSe inner windows of a cell, so that the spectra could be registered in the presence of gaseous adsorbate. Pure H2O or D2O ice as well as HCN/D2O and ND3/D2O mixed icy films with different dopant/water ratios (1:10, 1:5, and 1:1) were investigated. The surface area of ice deposited at 77 K H2O estimated from adsorption measurements was about 160 m2/g.