Generation of Binary COOx/SiO2 Nanoparticles from Organocompound Precursors
Moravec, Pavel; Smolík, Jiří; Bakardjieva, Snejana; Levdansky, V.V.
2011 - English In recent years cobalt and cobalt oxide nanoparticles have attracted substantial research effort because of their potential applications such as protective materials, catalysts, magnetic data recorders, batteries and gas sensors (Jang et al., 2004). To improve their functionality and biocompatibility nanoparticles are frequently coated with SiO2 (Teleki et al., 2008). In this work, we studied CoOx-SiO2 binary nanoparticles synthesis by metal organics chemical vapor deposition (MOCVD) using organo-compound precursors cobalt acetylacetonate (CoAA) and tetraethyl orthosilicate (TEOS). Keywords: binary nanoparticles; metal organics CVD; nanoparticle generation Available at various institutes of the ASCR Generation of Binary COOx/SiO2 Nanoparticles from Organocompound Precursors

In recent years cobalt and cobalt oxide nanoparticles have attracted substantial research effort because of their potential applications such as protective materials, catalysts, magnetic data ...

Moravec, Pavel; Smolík, Jiří; Bakardjieva, Snejana; Levdansky, V.V.
Ústav chemických procesů, 2011

AWS Viscosimetry of Microdispersions - Detection of Apparent Wall Slip
Pěnkavová, Věra; Večeř, M.; Wein, Ondřej
2011 - Czech The rheometric data measured using three various sensor geometries (PP60, ZZ40DIN and KK-sensor) are compared in this contribution at the case of water solution of polymer welan. The KK-sensor, constructed at our department, combines advantages of geometry both plate-plate and concentric cylinder geometry. It is shown that KK-sensor is comparable to commercial sensors. It is presented for water kaolin dispersions that apparent wall slip does not disappeared neither for low consistent dispersions. The values of slip coefficients are even higher in the case of less consistent samples. V tomto příspěvku je ukázáno porovnání dat ze tří různých viskozimetrických senzorů s různou geometrií (PP60, ZZ40 DIN a KK-senzor). KK-senzor, vyvinutý na našem pracovišti, spojuje výhody senzorů typu válec-válec a deska-deska. Na příkladu vodného roztoku welanu je ukázáno, že KKsenzor je srovnatelný s běžnými komerčními senzory PP60 a ZZ40 DIN. Na příkladech vodných kaolinových disperzí (čistě vodných i s přídavkem ztekucovadla hexametafosforečnanu sodného) je ukázáno, že ani v případě disperzí o relativně nízké konzistenci zdánlivý skluz na stěně nemizí. Hodnoty skluzových koeficientů jsou naopak u nížekonzistentních vzorků vyšší. Keywords: microdispersions; apparent wall slip; aws viscosimetry Available at various institutes of the ASCR AWS Viscosimetry of Microdispersions - Detection of Apparent Wall Slip

The rheometric data measured using three various sensor geometries (PP60, ZZ40DIN and KK-sensor) are compared in this contribution at the case of water solution of polymer welan. The KK-sensor, ...

Pěnkavová, Věra; Večeř, M.; Wein, Ondřej
Ústav chemických procesů, 2011

Detection of Signed Homonuclear Couplings between Low Abundant Nuclei
Blechta, Vratislav; Schraml, Jan
2011 - English The subject of this lecture is a modification of CSEc method for detection of signed homonuclear couplings. The new sequence is neither trivial nor simple application of the CSEc but some tricks are used to design broadband pulse sequence without selective pulses. The sequence was proved on a few samples by measuring carbon-carbon two- and three-bond couplings. For the first time signs of 2J(Si-O-Si) couplings were measured on a set of siloxane oligomers with different bond maps. The results will be presented. Keywords: signed coupling; linear spin system; sign of J(C,C) Available at various institutes of the ASCR Detection of Signed Homonuclear Couplings between Low Abundant Nuclei

The subject of this lecture is a modification of CSEc method for detection of signed homonuclear couplings. The new sequence is neither trivial nor simple application of the CSEc but some tricks are ...

Blechta, Vratislav; Schraml, Jan
Ústav chemických procesů, 2011

Biotechnology for Chemical Industry
Kaštánek, František
2011 - Czech Keywords: biotechnology; biocatalysts; chemical industry Available at various institutes of the ASCR Biotechnology for Chemical Industry

Kaštánek, František
Ústav chemických procesů, 2011

Possibilities of Application of Producer Gas from the Gasification of Biomass
Pohořelý, Michael; Jeremiáš, Michal; Kameníková, Petra; Svoboda, Karel; Skoblia, S.; Tošnarová, Markéta; Šyc, Michal; Punčochář, Miroslav
2010 - Czech In the paper, physico-chemical principles of gasification of biomass are explained and illustrated and the possibilities of producer gas cleaning for different potential applications are mentioned. In the second part, the possibilities of transformation of energetic gas to electric energy or to alternative or current transport fuels are described. V příspěvku jsou vysvětleny fyzikálně-chemické základy procesu zplyňování biomasy a naznačeny možnosti čištění plynu pro jednotlivé potenciální aplikace. V druhé části textu jsou popsány možnosti transformace energetického plynu na elektrickou energii a teplo i jednotlivá alternativní či stávající transportní paliva. Keywords: gasification; biomass; chp Available at various institutes of the ASCR Possibilities of Application of Producer Gas from the Gasification of Biomass

In the paper, physico-chemical principles of gasification of biomass are explained and illustrated and the possibilities of producer gas cleaning for different potential applications are mentioned. In ...

Pohořelý, Michael; Jeremiáš, Michal; Kameníková, Petra; Svoboda, Karel; Skoblia, S.; Tošnarová, Markéta; Šyc, Michal; Punčochář, Miroslav
Ústav chemických procesů, 2010

The Accuracy of a Monofiber Optical Probe
Vejražka, Jiří; Orvalho, Sandra; Večeř, M.; Sechet, P.; Cartellier, A.
2010 - English In this contribution, the accuracy of optical probe in a bubbly flow is deduced from high-speed imaging of bubble probe interaction. A dimensionless criterion useful for the estimation of the error of indicated void fraction is developed. It is also observed that the probe deformability may significantly decrease the probe accuracy. Keywords: opticle probe; bubble-fiber interaction; measurement accuracy Available at various institutes of the ASCR The Accuracy of a Monofiber Optical Probe

In this contribution, the accuracy of optical probe in a bubbly flow is deduced from high-speed imaging of bubble probe interaction. A dimensionless criterion useful for the estimation of the error of ...

Vejražka, Jiří; Orvalho, Sandra; Večeř, M.; Sechet, P.; Cartellier, A.
Ústav chemických procesů, 2010

Photo-Electrochemical Properties of Hierarchical Nanocomposite Structure: Carbon Nanofibers/TiO2/ZnO Thin Films
Hubička, Zdeněk; Kment, Štěpán; Gregora, Ivan; Čada, Martin; Olejníček, Jiří; Klusoň, Petr; Petras, D.; Krýsa, J.; Jastrabík, Lubomír; Dytrych, Pavel
2010 - English In this contribution we report on photoelectrochemical functionality of the multilayers system consisting of CNF's/photoactive anatase TiO2/ conductive ZnO thin films. Recently the thin phthalocyanines films has been prepared and studied individually. Keywords: phthalocyanines films; multi-layers systems; photovoltaics Available at various institutes of the ASCR Photo-Electrochemical Properties of Hierarchical Nanocomposite Structure: Carbon Nanofibers/TiO2/ZnO Thin Films

In this contribution we report on photoelectrochemical functionality of the multilayers system consisting of CNF's/photoactive anatase TiO2/ conductive ZnO thin films. Recently the thin ...

Hubička, Zdeněk; Kment, Štěpán; Gregora, Ivan; Čada, Martin; Olejníček, Jiří; Klusoň, Petr; Petras, D.; Krýsa, J.; Jastrabík, Lubomír; Dytrych, Pavel
Ústav chemických procesů, 2010

Formation Of Sn-Ag-C and Sn-Au-C Nanoalloys Through Ir Laser Ablation OF Ag and Au Target and Simultaneous Decomposition of TMT in the Gas Phase
Křenek, Tomáš; Murafa, Nataliya; Bezdička, Petr; Šubrt, Jan; Pola, Josef
2010 - English IR laser ablation of Ag or Au in dielectric breakdown of tetramethyltin leads to nanostructured films composed of nanograins of Sn and amorphous Au-C or Ag-C phases. Keywords: tetramethyltin; ir laser; ablation Available at various institutes of the ASCR Formation Of Sn-Ag-C and Sn-Au-C Nanoalloys Through Ir Laser Ablation OF Ag and Au Target and Simultaneous Decomposition of TMT in the Gas Phase

IR laser ablation of Ag or Au in dielectric breakdown of tetramethyltin leads to nanostructured films composed of nanograins of Sn and amorphous Au-C or Ag-C phases.

Křenek, Tomáš; Murafa, Nataliya; Bezdička, Petr; Šubrt, Jan; Pola, Josef
Ústav chemických procesů, 2010

Calcined Transition Metal Layered Double Hydroxides, Their Characterization and Activity in Total Oxidation of Ethanol
Jirátová, Květa; Kovanda, F.; Ludvíková, Jana; Klempa, Jan
2010 - English Keywords: catalytic activity; ethanol; chemical analysis Available at various institutes of the ASCR Calcined Transition Metal Layered Double Hydroxides, Their Characterization and Activity in Total Oxidation of Ethanol

Jirátová, Květa; Kovanda, F.; Ludvíková, Jana; Klempa, Jan
Ústav chemických procesů, 2010

Correlations for the Prediction of NTU and Mass Transfer Coefficient for a VPE
Rathilal, S.; Čárský, M.; Heyberger, Aleš; Rousková, Milena
2010 - English Liquid-liquid extraction is the separation of the constituents of a liquid solution by contact with another insoluble liquid and belongs to the class of countercurrent diffusional separation processes, where it ranks second in importance to distillation. There are many different types of columns that are available for liquid-liquid extraction and the reciprocating column and vibrating plate column are two types of mechanically aided columns. This paper aims at developing appropriate correlations for the prediction of NTU/HETS and the mass transfer coefficient, kox for the VPE based on the agitation level of the plates (af – the product of frequency and amplitude of the plate motion), the plate spacing and the flow rates which will allow for the simplification in the design of this type of column. Keywords: mass transfer coefficient; liquid-liquid extraction; acetone-toluene-water system Available at various institutes of the ASCR Correlations for the Prediction of NTU and Mass Transfer Coefficient for a VPE

Liquid-liquid extraction is the separation of the constituents of a liquid solution by contact with another insoluble liquid and belongs to the class of countercurrent diffusional separation ...

Rathilal, S.; Čárský, M.; Heyberger, Aleš; Rousková, Milena
Ústav chemických procesů, 2010