Effect of Cu2O Substrate on Photoinduced Hydrophilicity of TiO2 and ZnO Nanocoatings

The effect of a Cu2 O substrate on the photoinduced alteration of the hydrophilicity of TiO2 and ZnO surfaces was studied. It was demonstrated that the formation of heterostructures Cu2 O/TiO2 and Cu2 O/ZnO strongly changed the direction of the photoinduced alteration of surface hydrophilicity: while both TiO2 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 Cu2 O/TiO2 and Cu2 O/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 pho-toinduced alteration of the surface free energy and its polar and dispersive components. Alteration of the photoinduced hydrophilic behavior of TiO2 and ZnO surfaces caused by formation of the corresponding heterostructures with Cu2 O are explained within the mechanism of electron transfer and increasing of the electron concentration on the TiO2 and ZnO surfaces

Effect of the Type of Heterostructures on Photostimulated Alteration of the Surface Hydrophilicity: TiO2/BiVO4 vs. ZnO/BiVO4 Planar Heterostructured Coatings

Here, we report the results of comparative studies of the photostimulated hydrophilic behavior of heterostructured TiO2 /BiVO4 and ZnO/BiVO4, and monocomponent TiO2 and ZnO nanocoating surfaces. The chemical composition and morphology of the synthesized nanocoat-ings were characterized by XPS, SEM, and AFM methods. The electronic energy structure of the heterostructure components (band gap, top of the valence band, bottom of the conduction band, and Fermi level position) was determined on the basis of experimental results obtained by XPS, UV-V absorption spectroscopy and Kelvin probe methods. According to their electronic energy structure, the ZnO/BiVO4 and TiO2 /BiVO4 heterostructures correspond to type I and type II het-erostructures, respectively. The difference in the type of heterostructures causes the difference in the charge transfer behavior at heterojunctions: the type II TiO2 /BiVO4 heterostructure favors and the type I ZnO/BiVO4 heterostructure prevents the photogenerated hole transfer from BiVO4 to the outer layer of the corresponding metal oxide. The results of the comparative studies show that the interaction of the photogenerated holes with surface hydroxy-hydrated multilayers is responsible for the superhydrophilic surface conversion accompanying the increase of the surface free energy and work function. The formation of the type II heterostructure leads to the spectral sensitization of the photostimulated surface superhydrophilic conversion

Centrality evolution of the charged-particle pseudorapidity density over a broad pseudorapidity range in Pb-Pb collisions at root s(NN)=2.76TeV

Peer reviewe

Effect of the Type of Heterostructures on Photostimulated Alteration of the Surface Hydrophilicity: TiO2/BiVO4 vs. ZnO/BiVO4 Planar Heterostructured Coatings

Here, we report the results of comparative studies of the photostimulated hydrophilic behavior of heterostructured TiO2/BiVO4 and ZnO/BiVO4, and monocomponent TiO2 and ZnO nanocoating surfaces. The chemical composition and morphology of the synthesized nanocoatings were characterized by XPS, SEM, and AFM methods. The electronic energy structure of the heterostructure components (band gap, top of the valence band, bottom of the conduction band, and Fermi level position) was determined on the basis of experimental results obtained by XPS, UV-V absorption spectroscopy and Kelvin probe methods. According to their electronic energy structure, the ZnO/BiVO4 and TiO2/BiVO4 heterostructures correspond to type I and type II heterostructures, respectively. The difference in the type of heterostructures causes the difference in the charge transfer behavior at heterojunctions: the type II TiO2/BiVO4 heterostructure favors and the type I ZnO/BiVO4 heterostructure prevents the photogenerated hole transfer from BiVO4 to the outer layer of the corresponding metal oxide. The results of the comparative studies show that the interaction of the photogenerated holes with surface hydroxy-hydrated multilayers is responsible for the superhydrophilic surface conversion accompanying the increase of the surface free energy and work function. The formation of the type II heterostructure leads to the spectral sensitization of the photostimulated surface superhydrophilic conversion

Effect of the Type of Heterostructures on Photostimulated Alteration of the Surface Hydrophilicity: TiO₂/BiVO₄ vs. ZnO/BiVO₄ Planar Heterostructured Coatings

Here, we report the results of comparative studies of the photostimulated hydrophilic behavior of heterostructured TiO2/BiVO4 and ZnO/BiVO4, and monocomponent TiO2 and ZnO nanocoating surfaces. The chemical composition and morphology of the synthesized nanocoatings were characterized by XPS, SEM, and AFM methods. The electronic energy structure of the heterostructure components (band gap, top of the valence band, bottom of the conduction band, and Fermi level position) was determined on the basis of experimental results obtained by XPS, UV-V absorption spectroscopy and Kelvin probe methods. According to their electronic energy structure, the ZnO/BiVO4 and TiO2/BiVO4 heterostructures correspond to type I and type II heterostructures, respectively. The difference in the type of heterostructures causes the difference in the charge transfer behavior at heterojunctions: the type II TiO2/BiVO4 heterostructure favors and the type I ZnO/BiVO4 heterostructure prevents the photogenerated hole transfer from BiVO4 to the outer layer of the corresponding metal oxide. The results of the comparative studies show that the interaction of the photogenerated holes with surface hydroxy-hydrated multilayers is responsible for the superhydrophilic surface conversion accompanying the increase of the surface free energy and work function. The formation of the type II heterostructure leads to the spectral sensitization of the photostimulated surface superhydrophilic conversion

Neutrophil to Lymphocyte Ratio as a Predictor of Adverse Outcome in Patients with Decompensated Liver Cirrhosis

The natural history of liver cirrhosis (LC) is characterized by two stages: compensated and decompensated. Current clinical and laboratory prognostic models, such as Child-Pugh and MELD scales, do not take into account immune dysregulation, as well as it potential impact on the LC decompensation and the survival. Neutrophil to lymphocyte ratio (NLR) is simple and affordable parameter, representing the imbalance of two distinct immune pathways.Aim: to evaluate relationship between NLR level, mortality and SIRS development in patients with DC.Materials and methods. In this retrospective study 36 patients with DC which were hospitalized in Hepatology Department of V.H. Vasilenko clinic of propaedeutics and internal diseases, gastroenterology and hepatology, Sechenov University from January 2009 to December 2017 were enrolled. Correlation analysis, univariate and multivariable analysis were provided to find factors statistically significantly associated with lethal outcome and SIRS. The optimal cut-off levels for the NLR associated with adverse outcome were determined.Results. AIn multivariable analysis, NLR > 4 (p < 0,001) was statistically significantly associated with lethal outcome in patients with DC during hospitalization (OR: 1.57, [95 % CI 1.125–2.209], p = 0.008). Sensitivity and specificity of this cut-off is 100 % and 79.17 %, respectively. NLR > 4.8 was associated with SIRS development during hospitalization (OR: 1.484, [95 % CI 1.103–1.997], p = 0.009) with 100 % sensitivity and 90 % specificity.Conclusions. NLR is an independent risk factor of lethal outcome and SIRS development in patients with decompensated liver cirrhosis

Dependences of ZnO Photoinduced Hydrophilic Conversion on Light Intensity and Wavelengths

The present study explored the effect of light intensity and spectral variation of the actinic light on the hydrophilic conversion of the surface of ZnO nanocoatings. The dependence on light intensity indicates that both formation and destruction of the surface hydrophilic states occurs in parallel. The proposed kinetic mechanism corresponds well with experimental dependences. The spectral dependence of the photoinduced hydrophilic conversion of the ZnO surface suggests the important role of electronic photoexcitation of the solid. Similarity between the spectral distributions of the efficiency of photoinduced hydrophilic conversion and the ratio between the surface concentrations of electrons and holes (estimated on the basis of the ratio between quantum yields of oxygen and methane photostimulated adsorption) infers that the reason for the hydrophilicity alteration is the surface charge redistribution caused by actinic light

Neutrophil to Lymphocyte Ratio as a Predictor of Adverse Outcome in Patients with Decompensated Liver Cirrhosis

The natural history of liver cirrhosis (LC) is characterized by two stages: compensated and decompensated. Current clinical and laboratory prognostic models, such as Child-Pugh and MELD scales, do not take into account immune dysregulation, as well as it potential impact on the LC decompensation and the survival. Neutrophil to lymphocyte ratio (NLR) is simple and affordable parameter, representing the imbalance of two distinct immune pathways.Aim: to evaluate relationship between NLR level, mortality and SIRS development in patients with DC.Materials and methods. In this retrospective study 36 patients with DC which were hospitalized in Hepatology Department of V.H. Vasilenko clinic of propaedeutics and internal diseases, gastroenterology and hepatology, Sechenov University from January 2009 to December 2017 were enrolled. Correlation analysis, univariate and multivariable analysis were provided to find factors statistically significantly associated with lethal outcome and SIRS. The optimal cut-off levels for the NLR associated with adverse outcome were determined.Results. AIn multivariable analysis, NLR > 4 (p < 0,001) was statistically significantly associated with lethal outcome in patients with DC during hospitalization (OR: 1.57, [95 % CI 1.125–2.209], p = 0.008). Sensitivity and specificity of this cut-off is 100 % and 79.17 %, respectively. NLR > 4.8 was associated with SIRS development during hospitalization (OR: 1.484, [95 % CI 1.103–1.997], p = 0.009) with 100 % sensitivity and 90 % specificity.Conclusions. NLR is an independent risk factor of lethal outcome and SIRS development in patients with decompensated liver cirrhosis