Problems of Chemistry and Chemical Technology

The Simulation of Ink Penetration into Paper with Watermarks During Offset Printing

In this paper, we propose the model of ink fixing on paper with watermarks: properties of positive watermark areas are similar to high-calender paper and properties of areas beyond positive watermark and areas of negative watermark are similar to paper of machine smoothness. It causes difference of ink pigment and binding agent penetration into paper.

Novel Anion Exchanging Material Based on Silica Gel Covered by Nanolayer of Ferric Oxide

Using citrate techniques chemical modification of silica gel surface is carried out by iron oxide in an amount of 0,6 wt. %.

The Investigation of Properties of Acrylic Hydrogels as Materials for Artificial Soils

This paper studied the adsorption of cations, anions, nanometric metal-organocomplexes from the individual and binary solutions by acrylic hydrogels. We establish that the efficiency of sorption and strength of retention of metal compounds as cations is higher than of anions.

Resource Recycling Technologies Stems Miscanthus

Processes of obtaining pulp from Miscanthus stems for the production of paper and cardboard, microcrystalline cellulose and pellets were investigated. The chemical composition of Miscanthus giganteus stems was determinated. Established that the Miscanthus contains more cellulose, pentosans, minerals and less lignin than wood. The influence of main technological parameters on the quality indexes of organosolv pulp obtained from Miscanthus stems was investigated. The use of miscanthus organosolv pulp in composition of writing paper and paperboard container was experimentally confirmed.

Structure and Morphology of Zirconium Oxide (IV) Powders Synthesiized by the Thermal Method from Different Precursors

ZrO2 powders were synthesized from different precursors by the thermal method: zirconium hydroxide (ZrO(OH)2) and zirconium oxalate (ZrOC2O4). In synthesized samples by XRD analysis it was researched phase composition; sample, synthesized from ZrO(OH)2, consists of, mainly, the monoclinic modification, and sample, synthesized from ZrOC2O4 – of the tetragonal modification. It was calculated crystal grates parameters of obtained ZrO2 powders by the method of XRS analysis.

Electrochemical Sensor of Oxygen for Biological Liquids Based on Nanocrystilline Zn Oxide

In this paper, we propose to use nanocrystalline ZnO electrodes, obtained through zol-gel and electrochemical methods, as a sensitive element of dissolved oxygen sensor. We elucidate that electrodes have stable characteristics at electroreduction О2 in biological solutions. The average size of the obtained particles d makes up ∼10 nm. We determine the quantity of electrons on the discharge stage and the total quantity of electrons, participating in restoration reaction of oxygen.

Physical Models of Ultrasonic Influence are in Liquid Compositions of Epoxy Polymers. Part 2. Physical Model of the Process of Ultrasonic Influence of Different Frequency

Relying on the analysis of durability and operating characteristics of boundary hardened unfilled epoxy polymers obtained during ultrasonic influence with different frequencies at pressure variation on liquid epoxy compositions and their further hardening, we prove the corresponding physical model. We propose the effective parameters of the combined ultrasonic influence (frequency, amplitude, intensity, pressure) by example of shaping epoxy polymers with the form memory effect.

Kinetics of Dissolution of Precious Metals in Plasma Chemically Activated Solutions

This study suggests the possibility and efficiency of applying solutions, treated with the contact nonequilibrium low-temperature plasma to intensify dissolution of precious metals in cyanide leaching systems. The research results show that chemically activated plasma solutions due to the complex of peroxide and superperoxide compounds, radicals and particles formed in water during processing, have higher oxidizing properties as compared with synthetic hydrogen peroxide commonly used in the hydrometallurgical industry as oxidizing component.

Trinuclear Complexes of Co(III) with Triethanolamine

The polynuclear complexes of 3d-metals with aminoalcohols or their deprotonated forms can be catalytically active due to the availability of two close atoms of different metals connected with bridge oxygen atoms. Heterometal complexes of Co(III) can be used for synthesis of high efficient catalysts for processes with electron transfer by creating the nanostructured electrocatalytic centres on the surface using preliminary adsorption of complexes followed by pyrolysis at certain temperatures.

Structure Formation in the Ceramic Matrices for Immobilization of Wastes Substances

The paper studies processes of structure formation at heat treatment of purification wastes of radioactive cesium waters using sorbents based on clay minerals and zeolite. We define structural and mechanical properties of simples and find the optimum conditions of their heat treatment aimed at obtaining based on crystalline structures with the most effective physical and mechanical properties. We also investigate mechanical and chemical stability of ceramic matrices formation and also strength of commitment 137 Cs in them.