High-Conductive CsHPO Membranes with PVDF-Based Polymers Additives.

The study is devoted to one of the important problems of hydrogen energy-the comparative analysis and creation of novel highly conductive and durable medium-temperature proton membranes based on cesium dihydrogen phosphate and fluoropolymers. The proton conductivity, structural characteristics and mechanical properties of (1 - x)CsHPO-x fluoropolymer electrolytes (x-mass fraction, x = 0-0.3) have been investigated and analyzed.

Copolymer of VDF/TFE as a Promising Polymer Additive for CsHPO-Based Composite Electrolytes.

The composite polymer electrolytes (1-x)CsHPO-xF-2M (x = 0-0.3) have been first synthesized and their electrotransport, structural, and mechanical properties were investigated in detail by impedance, FTIR spectroscopy, electron microscopy, and X-ray diffraction methods. The structure of CsHPO (P2/m) with salt dispersion is retained in the polymer electrolytes.

Stabilization of the (CH)NHSO High-Temperature Phase in New Silica-Based Nanocomposite Systems.

In this study, the electrotransport, thermal and structural properties of composite solid electrolytes based on (CH)NHSO plastic phase and silica (1 - x)EtNHSOxSiO, where x = 0.3-0.9) were investigated for the first time.

New Type of Nanocomposite CsHPO-UiO-66 Electrolyte with High Proton Conductivity.

New (1−x)CsH2PO4−xUiO-66 electrolytes with high proton conductivity and thermal stability at 230−250 °C were developed. The phase composition and proton conductivity of nanocomposites (x = 0−0.15) were investigated in detail.

Effect of Pore Filling on Properties of Nanocomposites LiClO-MIL-101(Cr) with High Ionic Conductivity.

Experimental data on nitrogen adsorption, pellets density and ionic conductivity of nanocomposite solid electrolytes (1−x)LiClO4−xMIL-101(Cr) were interpreted in frames of the model of the composite in which the lithium salt fills the pores of a metal-organic framework MIL-101(Cr). According to the model, the concentration of lithium salt located in the pores reaches a maximum at the concentration x = xmax which is defined by a ratio of the molar volume of LiClO4 and the total volume of accessible pores in the MIL-101(Cr) framework. The model allows one to describe the dependences of pore volume and pellet density on the concentration of MIL-101(Cr).

Crystal structure and proton conductivity of a new Cs(HPO)(HPO)·2HO phase in the caesium di- and monohydrogen orthophosphate system.

The MH(AO) acid salts (M = Cs, Rb, K, Na, Li, NH; A = S, Se, As, P) exhibit ferroelectric properties. The solid acids have low conductivity values and are of interest with regard to their thermal properties and proton conductivity. The crystal structure of caesium dihydrogen orthophosphate monohydrogen orthophosphate dihydrate, Cs(HPO)·2HO, has been solved.

High proton conductivity and spectroscopic investigations of metal-organic framework materials impregnated by strong acids.

Strong toluenesulfonic and triflic acids were incorporated into a MIL-101 chromium(III) terephthalate coordination framework, producing hybrid proton-conducting solid electrolytes. These acid@MIL hybrid materials possess stable crystalline structures that do not deteriorate during multiple measurements or prolonged heating. Particularly, the triflic-containing compound demonstrates the highest 0.

Imparting high proton conductivity to a metal-organic framework material by controlled acid impregnation.

The extensive implementation of hydrogen-powered technology today is limited by a number of fundamental problems related to materials research. Fuel-cell hydrogen conversion technology requires proton-conducting materials with high conductivity at intermediate temperatures up to 120 °C. The development of such materials remains challenging because the proton transport of many promising candidates is based on extended microstructures of water molecules, which deteriorate at temperatures above the boiling point.

Canine leishmaniosis and its relationship to human visceral leishmaniasis in Eastern Uzbekistan.

Background: The Namangan Region in the Pap District, located in Eastern Uzbekistan is the main focus of visceral leishmaniasis (VL) in Uzbekistan. In total, 28 cases of human VL were registered during 2006-2008 in this region. A study on the epidemiology of VL in this area was carried out in 2007-2008 in the villages of Chodak, Oltinkan, Gulistan and Chorkesar located at elevations of 900-1200 above sea level.