0000000000291615

AUTHOR

Jurijs Ozolins

showing 7 related works from this author

Studies of TiO<sub>2</sub> Ceramics Structure after Thermal Treatment at Different Conditions

2014

The present work describes results of investigation of structural characteristics of TiO2 ceramics, depending on temperature and thermal treatment conditions by using a variety of characterization techniques. TiO2 ceramics was prepared by extrusion method and developed as a material for electrodes for innovative water treatment technologies. It was shown that non-stoichiometric phase TiO1.95 was observed after thermal treatment of TiO2 ceramics under high vacuum conditions.

Materials scienceMechanical EngineeringUltra-high vacuumMetallurgyThermal treatmentCharacterization (materials science)Mechanics of Materialsvisual_artPhase (matter)Electrodevisual_art.visual_art_mediumGeneral Materials ScienceWater treatmentExtrusionCeramicKey Engineering Materials
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Development of Peat Processing Methods for Production of Innovative Products

2020

Synthesis or humification of humic substances (HSs) is the second widely applied organic compound transformation process after photosynthesis. Peat decomposition process results in a production of a HSs which has a high demand in agriculture, forestry, and gardening areas. Addition of the KOH is good option for environmental protection and K+ belongs to the nitrogen, potassium and phosphorous (NKP) mineral component. A homogenization process in a customize for commerce, where peat treatment technology was improved with the help of the cavitation effect. This effect was provided with the help of the high-speed mixer-disperser (HSMD) developed at Riga Technical University. Mechanical cavitati…

PeatChemistry020209 energyMechanical EngineeringFulvic acid02 engineering and technology021001 nanoscience & nanotechnologyPulp and paper industryFluorescence spectraProcessing methodsMechanics of Materials0202 electrical engineering electronic engineering information engineeringProduction (economics)General Materials Science0210 nano-technologyKey Engineering Materials
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Electrochemical Studies of Nonstoichiometric TiO<sub>2-x</sub> Ceramic

2014

TiO2 ceramic was prepared using extrusion technology and thermal treatment in two stages: sintering in air and subsequent annealing under high vacuum conditions. Sample thermal treatment in high vacuum conditions causes formation of nonstoichiometric titanium oxide ceramic. As a result electrical conductivity of the material significantly increases. Such a material can be used for electrode production for electrochemical water treatment.

Materials scienceAnnealing (metallurgy)Mechanical EngineeringMetallurgyUltra-high vacuumSinteringThermal treatmentTitanium oxideMechanics of Materialsvisual_artElectrodevisual_art.visual_art_mediumGeneral Materials ScienceExtrusionCeramicKey Engineering Materials
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Investigation of TiO<sub>2</sub> Ceramic Surface Conductivity Using Conductive Atomic Force Microscopy

2012

Dense TiO2 (rutile) ceramic samples were prepared by sintering compacts of titanium dioxide anatase powder at 1500 °C for 5h. Sintered samples were polished and annealed in vacuum at 1000 °C for 1h. Structural properties of the samples were studied by X-ray diffraction, polarized light and scanning electron microscopy. The surface topography and local electrical conductivity of the samples were investigated by atomic force microscopy technique under atmospheric conditions. Enhanced electrical conductivity was observed at grain boundaries while the polished, vacuum annealed grains surface showed non-homogeneous conductivity.

AnataseMaterials scienceScanning electron microscopeMechanical EngineeringAnalytical chemistryConductive atomic force microscopyConductivitySurface conductivityMechanics of Materialsvisual_artvisual_art.visual_art_mediumGeneral Materials ScienceGrain boundaryCeramicPhotoconductive atomic force microscopyKey Engineering Materials
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Potential of Baltic Region Peat in High Added-value Products and Environmentally Friendly Applications - A Review

2021

The present review is dedicated to using of peat on the example of fen peat in high added-value products and applications. Mainly, but not limited, last decade literature was analysed from the perspective of innovation potential of peat applications in environmental technologies on examples of studies from the Baltic Sea region. Paper covers a wide range of applications of peat products started from agriculture to medicine and cosmetics. A separate chapter is devoted to the deep-processed peat product - humic substances (humate, humic and fulvic salts and acids). Generalised dependence of product extraction rate and its properties, depending on the process parameters are provided. Widely ar…

environmental_scienceschemistry.chemical_classificationPeatchemistryFulvic acidAdded valueEnvironmental scienceHumic acidPulp and paper industryEnvironmentally friendly
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Granulation of fly ash and biochar with organic lake sediments – A way to sustainable utilization of waste from bioenergy production

2019

Abstract The main waste generated during the thermochemical processes of biomass burning used for bioenergy production in cogeneration plants are ash and biochar which can be used as fertilizers in forestry and agriculture. However, several difficulties are attributed to possibilities of practical exploitation of ash and biochar due to the transporting, handling and mode of application. Granulation of energy generation waste has been shown in some circumstances as a cost-effective and environmentally friendly method. Production of granules (pellets) from wood ash and biochar leads to improved recycling and logistics of waste as well as helps to control and avoid undesirable environmental ef…

Renewable Energy Sustainability and the Environment020209 energyForestryWood ash02 engineering and technologyRaw materialPulp and paper industrycomplex mixturesBulk densitySoil conditionerGranulationBioenergyFly ashBiochar0202 electrical engineering electronic engineering information engineeringEnvironmental scienceWaste Management and DisposalAgronomy and Crop ScienceBiomass and Bioenergy
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Influence of Glass Additions on Illitic Clay Ceramics

2020

A mixture of an illitic clay and waste glass was prepared and studied during the sintering process. The illitic clay, from the Liepa deposit (Latvia), and green glass waste (GW) were disintegrated to obtain a homogeneous mixture. The addition of disintegrated GW (5&ndash

Materials science020209 energySintering02 engineering and technologyceramicsengineering.materiallcsh:TechnologyArticleBreakage0202 electrical engineering electronic engineering information engineeringGeneral Materials ScienceCeramiclcsh:MicroscopyPorositylcsh:QC120-168.85glasswaste glasslcsh:QH201-278.5lcsh:TclayAtmospheric temperature rangecompressive strength021001 nanoscience & nanotechnologyilliteCompressive strengthlcsh:TA1-2040visual_artIllitespecific strengthvisual_art.visual_art_mediumengineeringlcsh:Descriptive and experimental mechanicsillite; glass; waste glass; ceramics; specific strength; compressive strengthlcsh:Electrical engineering. Electronics. Nuclear engineeringlcsh:Engineering (General). Civil engineering (General)0210 nano-technologyClay mineralslcsh:TK1-9971Nuclear chemistryMaterials
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