Premises of creation of Internet portal designed to provide access to participants of educational and scientific process for the joint creation, consolidation, concentration and rapid spreading of educational and scientific information resources in its own depository are considered. CMS-based portal content management systems’ potentiality is investigated. Architecture for Internet portal of MES of Ukraine’s information resources is offered.

Створення порталу інформаційно-довідкових ресурсів міністерства освіти і науки україни

A conceptual review on polymer electrolytes and ion transport models

A chiral two-dimensional MOF, {[Ca(D-Hpmpc)(H2O)2]·2HO0.5}n (1, D-H3pmpc = D-1-(phosphonomethyl) piperidine-3-carboxylic acid), with intrinsic proton conductivity has been synthesized and characterized. Structure analysis shows that compound 1 possesses protonated tertiary amines as proton carriers and hydrogen-bonding chains served as proton-conducting pathways. Further, MOF–polymer composite membranes have been fabricated via assembling polymer PVP with different contents of rod-like 1 submicrometer crystals. Interestingly, the proton conductivity of this composite membrane containing 50 wt% 1 is rapidly increased, compared with that of pure submicrometer crystals at 298 K and ∼53% RH. Therefore, it is feasible to introduce humidification of PVP into composite membranes to enhance low-humidity proton conductivity; and humidified PVP with adsorbed water molecules plays an important role in proton conduction indicated by the results of water physical sorption and TG/DTG analyses. This study may offer a facile strategy to prepare a variety of solid electrolyte materials with distinctive proton-conducting properties under a low humidity.

From metal–organic framework (MOF) to MOF–polymer composite membrane: enhancement of low-humidity proton conductivity

All-temperature flexible supercapacitors have not been realized because of challenges from conventional hydrogel electrolytes. Large amounts of water in hydrogel electrolytes inevitably freeze and restrict ion transport at subzero temperatures, and their structures are unstable under high temperature. Here, all-temperature flexible supercapacitors are reported based on an antifreezing and thermally stable montmorillonite/poly(vinyl alcohol) (MMT/PVA) hydrogel electrolyte. MMT materials enhance the thermal stability of the hydrogel, and their lamellar structures facilitate ion conduction due to formation of oriented conductive pathways. The aqueous electrolyte with a freezing point below -50 °C is employed by simply introducing dimethyl sulfoxide. The electrolyte exhibits high ionic conductivity of 0.17 × 10-4 and 0.76 × 10-4 S cm-1 under -50 and 90 °C, respectively. The supercapacitor delivers high capacities under a wide temperature range from -50 to 90 °C and displays excellent cycling stability over 10000 cycles. Because of the hydrogel electrolyte's superior mechanical properties, the device gives stable energy capacity under flexible conditions.

All-Temperature Flexible Supercapacitors Enabled by Antifreezing and Thermally Stable Hydrogel Electrolyte

Nonaqueous polar solvents in reverse micelle systems.

Dielectric properties of montmorillonite clay filled poly(vinyl alcohol)/poly(ethylene oxide) blend nanocomposites

Dielectric behaviour and hydrogen bond molecular interaction study of formamide-dipolar solvents binary mixtures

Dielectric spectroscopy of hydrophilic polymers–montmorillonite clay nanocomposite aqueous colloidal suspension

The formation of hydrogen bonds between different types of molecules in binary alcohol mixtures (methyl alcohol, ethyl alcohol, ethylene glycol, propylene glycol and glycerol) have been investigated (each system at 21 mixture concentrations) by an analysis of their dielectric parameters. The static dielectric constant e
 o, limiting high-frequency dielectric constant e
 ∞, excess dielectric parameters e
 o
 E
 and e
 ∞
 E
 , effective Kirkwood correlation factor g
 eff, and corrective Kirkwood correlation factor g
 f of the binary alcohol mixtures were determined at 25 °C in order to explore hydrogen-bond interactions and the strength of molecular connectivities between unlike alcohol molecules and their dipole alignment. These results confirm that the different alcohol mixtures form hydrogen-bonded structures, which are strongly influenced by the numbers of hydroxyl groups and carbon atoms of the alcohol molecules and vary with the concentrations of the mixtures.

Dielectric Parameters and Hydrogen Bond Interaction Study of Binary Alcohol Mixtures

Dielectric properties and hydrogen bonding interaction behaviour in binary mixtures of glycerol with amides and amines

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