Number of found documents: 7378
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Non-Thermal Crystallization of TiO2 Thin Films using Supercritical Carbon Dioxide Modified by Ethanol-Water Mixture.
Sajfrtová, Marie; Cerhová, Marie; Jandová, Věra; Dřínek, Vladislav; Matějová, L.; Daniš, S.
2018 - English
In this work, the scCO2 modified by mixture of water and ethanol was used for a preparation of crystalline and pure nanostructured TiO2 thin films in one step processing. All the experiments were performed over precursor titania thin films prepared by reverse micelles assisted sol-gel method, using hardly removable nonionic surfactant Triton X-114, however, forming uniform nano-domains. The effect of temperature (40-150 °C), pressure (10-30 MPa), modifier composition \n(20, 50 and 80 % w/w of water in ethanol) and concentration inscCO2 (5-15 wt. %) and consumed amount of solvent (50-200 g) on microstructure and purity\nof TiO2 thin films was thoroughly studied by means of Raman spectroscopy, X-ray diffraction, and contact angle measurements. Keywords: ethanol-water mixture; TiO2 thin films; temperature Available in a digital repository NRGL
Non-Thermal Crystallization of TiO2 Thin Films using Supercritical Carbon Dioxide Modified by Ethanol-Water Mixture.

In this work, the scCO2 modified by mixture of water and ethanol was used for a preparation of crystalline and pure nanostructured TiO2 thin films in one step processing. All the experiments were ...

Sajfrtová, Marie; Cerhová, Marie; Jandová, Věra; Dřínek, Vladislav; Matějová, L.; Daniš, S.
Ústav chemických procesů, 2018

Influence of Water-Ethanol-Modified Supercritical Carbon Dioxide at the Preparation of Crystalline Monolithic TiO2 Aerogels.
Cerhová, Marie; Sajfrtová, Marie; Matějová, L.; Dřínek, Vladislav; Daniš, S.; Jandová, Věra
2018 - English
This work is focused on a study of TiO2 aerogel SFC with scCO2 modified by mixture of ethanol and water in a ratio 1:1. The effect of temperature (40-100 °C), pressure (10-30 MPa) and modifie concentration in scCO2 (5-15 wt.%) and the additional drying with pure CO2 on microstructure, purity and textural properties of TiO2 aerogel was investigated. Processed monoliths were characterized by XRD analysis, Raman spectroscopy and N2 physisorption. Keywords: TiO2 aerogels; temperature; supercritical carbon dioxide Available in a digital repository NRGL
Influence of Water-Ethanol-Modified Supercritical Carbon Dioxide at the Preparation of Crystalline Monolithic TiO2 Aerogels.

This work is focused on a study of TiO2 aerogel SFC with scCO2 modified by mixture of ethanol and water in a ratio 1:1. The effect of temperature (40-100 °C), pressure (10-30 MPa) and modifie ...

Cerhová, Marie; Sajfrtová, Marie; Matějová, L.; Dřínek, Vladislav; Daniš, S.; Jandová, Věra
Ústav chemických procesů, 2018

Efficient H2/CO2 Separation using PVA/[EMIM][DCA] Polymer Blend Membranes.
Lanč, M.; Setničková, Kateřina; Brazinha, C.; Klepić, M.; Vopička, O.; Forejtová, M.; Izák, Pavel; Crespo, J.G.; Friess, K.
2018 - English
Keywords: membranes; experiments; separation Available in a digital repository NRGL
Efficient H2/CO2 Separation using PVA/[EMIM][DCA] Polymer Blend Membranes.

Lanč, M.; Setničková, Kateřina; Brazinha, C.; Klepić, M.; Vopička, O.; Forejtová, M.; Izák, Pavel; Crespo, J.G.; Friess, K.
Ústav chemických procesů, 2018

Pilot-scale Operation of Electrocoagulation for Removal of Toxic Metals.
Krystyník, Pavel; Mašín, P.; Krušinová, Z.; Klusoň, Petr
2018 - English
The process was tested in pilot-scale unit placed in movable container and operated in continuous regime. The results have shown that the removal efficacies are strongly dependent on the dose of coagulant, which is the most important and crucial parameters affecting performance of electrocoagulation and of course on other process parameters. It is also very reliant on contaminant content in treated effluent. An addition of flocculating agent was also tested on the improvements of process performance. Keywords: electrocoagulation; toxic metal; wastewater treatment processes Available in a digital repository NRGL
Pilot-scale Operation of Electrocoagulation for Removal of Toxic Metals.

The process was tested in pilot-scale unit placed in movable container and operated in continuous regime. The results have shown that the removal efficacies are strongly dependent on the dose of ...

Krystyník, Pavel; Mašín, P.; Krušinová, Z.; Klusoň, Petr
Ústav chemických procesů, 2018

Ethylene Oxychlorination over CuCl2/γ-Al2O3 Catalyst in Micro- and Milli-structured Reactors.
Vajglová, Zuzana; Moro, A.; Kumar, N.; Eränen, K.; Peurla, M.; Peltonen, J.; Murzin, D.Yu.; Salmi, T.
2018 - English
In the microreactor, the 1,2-dichlorethane selectivities of 4.7% and 53.6% were achieved with the ethene conversions of 1.6% and 6.4%, respectively. The other important product was chloroethane. The formation of vinyl chloride by-product of 1.6% was observed only at the highest temperature 250 °C with highest ethene conversion achieved (6.4%). No other by-products were observed. In the millireactor, the 1,2-dichlorethane selectivities exceeding 96% were achieved at ethene conversions higher than 11% within the entire experimental range. Chloroethane, vinyl chloride, 1,2-dichloroethylene (trans) were formed, but only in minor amounts. Keywords: ethylene oxychlorination; reactors; catalysts Available in a digital repository NRGL
Ethylene Oxychlorination over CuCl2/γ-Al2O3 Catalyst in Micro- and Milli-structured Reactors.

In the microreactor, the 1,2-dichlorethane selectivities of 4.7% and 53.6% were achieved with the ethene conversions of 1.6% and 6.4%, respectively. The other important product was chloroethane. The ...

Vajglová, Zuzana; Moro, A.; Kumar, N.; Eränen, K.; Peurla, M.; Peltonen, J.; Murzin, D.Yu.; Salmi, T.
Ústav chemických procesů, 2018

Experimental Determination of Total Pressure for Binary Water + Poly(ethylene glycol) Mixtures.
Pavlíček, Jan; Bogdanić, Grozdana; Wichterle, Ivan; Izák, Pavel
2018 - English
Keywords: total pressure measurement; polymer–solvent system; vapour–liquid equilibria Available in a digital repository NRGL
Experimental Determination of Total Pressure for Binary Water + Poly(ethylene glycol) Mixtures.

Pavlíček, Jan; Bogdanić, Grozdana; Wichterle, Ivan; Izák, Pavel
Ústav chemických procesů, 2018

Porovnání zdrojů atmosféricého aerosolu na příměstské a venkovské stanici.
Makeš, Otakar; Schwarz, Jaroslav; Vodička, Petr; Ždímal, Vladimír
2018 - Czech
Tento článek se zabývá analýzou rozdělení zdrojů jemné aerosolové frakce měřenou C-ToF AMS na dvou různých místech. Výsledkem analýzy je porovnání aerosolových zdrojů mezi příměstskými a zázemím během letní a zimní sezóny This article discusses source apportionment analysis of fine aerosol fraction measured by C-ToF AMS at two different sites. The result of the analysis is a comparison of the aerosol sources between suburban and background sites during summer and winter season. Keywords: atmospheric aerosols; AMS; PMF Available in a digital repository NRGL
Porovnání zdrojů atmosféricého aerosolu na příměstské a venkovské stanici.

Tento článek se zabývá analýzou rozdělení zdrojů jemné aerosolové frakce měřenou C-ToF AMS na dvou různých místech. Výsledkem analýzy je porovnání aerosolových zdrojů mezi příměstskými a zázemím během ...

Makeš, Otakar; Schwarz, Jaroslav; Vodička, Petr; Ždímal, Vladimír
Ústav chemických procesů, 2018

Measuring photon-upconversion luminiscence from droplets in microfluidic chips
Hlaváček, Antonín; Křivánková, Jana; Přikryl, Jan
2018 - English
UCNPs are lanthanide-doped nanocrystals that can be excited by near-infrared light and emit light of shorter wavelengths. Advantages of UCNPs include multiple and narrow emission bands, negligible autofluorescence and high photostability, which make UCNPs ideal luminescence label for use in droplet microfluidic. Here, we introduce the instrumentation for reading photon-upconversion luminescence of nanoparticles, which are dispersed in water droplets in a microfluidic chip. Keywords: photon-upconversion; microfluidic chip; microdroplets; nanoparticles Fulltext is available at external website.
Measuring photon-upconversion luminiscence from droplets in microfluidic chips

UCNPs are lanthanide-doped nanocrystals that can be excited by near-infrared light and emit light of shorter wavelengths. Advantages of UCNPs include multiple and narrow emission bands, negligible ...

Hlaváček, Antonín; Křivánková, Jana; Přikryl, Jan
Ústav analytické chemie, 2018

Effects of urbanization on the landscape of a Modern City in Ghana: A case study of sunyani
Boateng, K. A.; Mensah, Caleb; Agyei, Thomas; Švik, Marian
2018 - English
According to the fifth assessment report of the Intergovernmental Panel on Climate Change, changes in land use through urbanization and agriculture are the key anthropogenic effects of climate change. Thus, the preservation of natural environment of urban areas is essential for conserving water and soil, while still adjusting the microclimatic variables (temperature, precipitation, relative humidity, etc.) and stabilizing the natural ecological system from destruction. It has been observed that most parts of city's green vegetation have been lost due to housing developments and commercial activities. This study was carried out to assess the effect of the change in land use on a modern city like Sunyani, by observing the significant changes in vegetation cover from LANDSAT TM imagery over a 31-year period (1986-2017). From the study, there was significant decline of vegetation cover from 1986 to 1999, and no significant change from 1999 to 2017. There were also significant changes in the built-up areas from 1986 to 1999 and no significant change from 1999 to 2017. Adoption of sustainable and environmentally friendly technologies that maintain open green vegetation is recommended for future city planning. Keywords: Climate change; Green vegetation; landsat; Open green spaces; Urbanization Available at various institutes of the ASCR
Effects of urbanization on the landscape of a Modern City in Ghana: A case study of sunyani

According to the fifth assessment report of the Intergovernmental Panel on Climate Change, changes in land use through urbanization and agriculture are the key anthropogenic effects of climate change. ...

Boateng, K. A.; Mensah, Caleb; Agyei, Thomas; Švik, Marian
Ústav výzkumu globální změny , 2018

Method Development for Speciation Analysis of Volatile Mercury Forms in Ambient Air and flue Gases from Incineration Plants.
Švehla, Jaroslav; Kratzer, J.; Svoboda, M.; Svoboda, Karel; Šyc, Michal; Ružovič, Tomáš
2018 - English
Potential of AAS for on-line speciation analysis of gaseous Hg0 (non-heated atomizer) and HgCl2 (heated atomizer) in flue gases is discussed. Keywords: mercury speciation analysis; flue gas; atomic absorption spectrometry Available in a digital repository NRGL
Method Development for Speciation Analysis of Volatile Mercury Forms in Ambient Air and flue Gases from Incineration Plants.

Potential of AAS for on-line speciation analysis of gaseous Hg0 (non-heated atomizer) and HgCl2 (heated atomizer) in flue gases is discussed.

Švehla, Jaroslav; Kratzer, J.; Svoboda, M.; Svoboda, Karel; Šyc, Michal; Ružovič, Tomáš
Ústav chemických procesů, 2018

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