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Změna estetického vzhledu polyesterové tkaniny
Sobek, Jiří
2014 - Czech
Studie je zaměřena na změnu estetického vzhledu polyesterové tkaniny vlivem použití nevhodného lepidla. The study is focused on changes the aesthetic appearance of polyester fleece due to use of improper glue.
Keywords:
glue; polyester; aesthetic
Available at various institutes of the ASCR
Změna estetického vzhledu polyesterové tkaniny
Studie je zaměřena na změnu estetického vzhledu polyesterové tkaniny vlivem použití nevhodného lepidla....
18M-IMMEDIATE Research Report: Prototype of Catalyst Powder Sufficient for Testing in MEAs Fabricated
Kaluža, Luděk; Zdražil, Miroslav; Gulková, Daniela; Koštejn, Martin; Vít, Zdeněk
2014 - English
High loadings of platinum (60 wt%) were precipitated (ICPF) or depo-sited (CNRS) onto research grade carbon black supports provided by TC. The supports and the resulting electrocatalysts were thoroughly characterised in order to select the best ones for optimisation and up-scaled manufacturing. For the preparation and characterisation vari-ous methodologies have been developed. Batches of the gram size were prepared of a handful of the most promising catalysts. This is sufficient for the preparation of test MEAs.
Keywords:
Pt catalysts; stress tests; nitrogen physisorption
Available at various institutes of the ASCR
18M-IMMEDIATE Research Report: Prototype of Catalyst Powder Sufficient for Testing in MEAs Fabricated
High loadings of platinum (60 wt%) were precipitated (ICPF) or depo-sited (CNRS) onto research grade carbon black supports provided by TC. The supports and the resulting electrocatalysts were ...
Models of AWS Material Functions
Wein, Ondřej; Pěnkavová, Věra
2014 - English
New classes of 4-parameter models of fluidity for the shear-thinning non-Newtonian liquids are introduced, including their local pseudosimilarity representation. The models cover both purely-viscous (PV) and visco-plastic (VP) flow behavior. New 4-parameter model of slipidity (Navier slip coefficient) is introduced, as well as its modification for retarded AWS (slipidity decreasing with rising shear stress) and wall dilatancy (negative slipidity). Their asymptotic behavior, as well as their asymptotic sub-models are identified and prepared for implementation in the software AWSWork.
Keywords:
visco-plastic materials; purely viscous liquids; pseudosimilarity; material functions
Available on request at various institutes of the ASCR
Models of AWS Material Functions
New classes of 4-parameter models of fluidity for the shear-thinning non-Newtonian liquids are introduced, including their local pseudosimilarity representation. The models cover both purely-viscous ...
12M-IMMEDIATE Research Report: Preparation of Pt on Carbon Black Supported Catalysts
Kaluža, Luděk; Zdražil, Miroslav; Gulková, Daniela; Vít, Zdeněk; Šolcová, Olga; Soukup, Karel; Maixnerová, Lucie
2014 - English
The aim of this work was to elucidate on advanced preparation of Pt/C catalysts from TimCal carbon black and H2PtCl6. The attention was directed to residual content of chloride in the prepared catalysts and scale-up to the amount about 1 gram of final product. The textrual properties of the supports and selected catalyst were studied by nitrogen physisorption. The analytical methods such as instrumental neutron activation analysis (INAA), liquid ion chromatography (LC), and titration with silver nitrates were applied for Cl analysis. Electron probe micro analysis (SEM-EDX), hydrogen chemisorption, temperature programed desorption of hydrogen (TPD) and a simplified determination of ignition temperature in air flow were used for Pt/C catalysts characterization.
Keywords:
Pt/C catalysts; carbon black; analytical methods
Available at various institutes of the ASCR
12M-IMMEDIATE Research Report: Preparation of Pt on Carbon Black Supported Catalysts
The aim of this work was to elucidate on advanced preparation of Pt/C catalysts from TimCal carbon black and H2PtCl6. The attention was directed to residual content of chloride in the prepared ...
Rheology of Colloidal Dispersions: Deflocculation of Kaolin Dispersions
Guerreiro, M.I.A.; Růžička, Marek; Pěnkavová, Věra
2013 - English
All inorganic additives in their optimal concentrations proved to be effective at reducing the initial viscosity to 1%. In the case of NaOH two different trends were observed: firstly this additive behaved as a deflocculant agent where, at its optimal range of concentrations, the viscosity of kaolin dispersion reduced to its minimal value, secondly when used at concentrations above its optimal range, sodium hydroxide behaved like a flocculant agent increasing strongly the viscosity of kaolin dispersions. The possible cause was attributed to an excess of Na+ and OH- species in bulk media that promoted the reversible effect. Similar effect was also reported for NaCMC at high and medium molar weight, were the viscosity firstly decreased to a certain concentration of additive and then above that concentration started to increase. Thus low molar weight NaCMC was the most effective among the organic additives since it decreased the viscosity to 10% of initial viscosity. Qualitative evaluation showed that organic additives promoted more stable dispersions, in contrast to poor stability offered by the inorganic additives, with exception of NaOH that provided dispersions with good stability inside of its optimal range.
Keywords:
kaolin dispersions; yield strss; viscoplastic fluids
Available at various institutes of the ASCR
Rheology of Colloidal Dispersions: Deflocculation of Kaolin Dispersions
All inorganic additives in their optimal concentrations proved to be effective at reducing the initial viscosity to 1%. In the case of NaOH two different trends were observed: firstly this additive ...
6M-IMMEDIATE Research Report: Preparation of Pt on Carbon Black Supported Catalysts
Kaluža, Luděk; Zdražil, Miroslav; Gulková, Daniela; Vít, Zdeněk; Šolcová, Olga; Soukup, Karel; Maixnerová, Lucie
2013 - English
The purpose of the present work is to elucidate on carbon black materials as a support for high loading of Pt in highly dispersed form. There are three main methodologies described in the .literature for deposition of Pt: i) impregnation of the support with solution of well soluble Pt precursors, ii) deposition of a colloidal form of Pt onto the support, and iii) deposition of Pt onto the supports from microemulsion of Pt precursor with the assistance of surfactant. The Pt containing species are deposited either by spontaneous adsorption or by evaporation of the solvent. The deposited platinum compound is transformed to metallic platinum with some chemical or physical (temperature) treatment. Remainders of the deposited compound other than platinum must be removed from the catalysts (for instance by washing, calcination, etc.).
Keywords:
elucidate; carbon black materials; platinum
Available at various institutes of the ASCR
6M-IMMEDIATE Research Report: Preparation of Pt on Carbon Black Supported Catalysts
The purpose of the present work is to elucidate on carbon black materials as a support for high loading of Pt in highly dispersed form. There are three main methodologies described in the .literature ...
Fluidní spalování kontaminované biomasy III
Pohořelý, Michael; Durda, Tomáš; Šyc, Michal; Tošnarová, Markéta; Krček, Martin; Punčochář, Miroslav
2013 - Czech
Ve zprávě byla prokázána možnost účinně spalovat předupravenou kukuřičnou slámu ve fluidním reaktoru se stacionární bublinovou vrstvou za přítomnosti významného podílu draslíku. In the report, it has been shown how to effectively burn pretreated cornstalks in the fluidized-bed reactor with a stationary bubbling bed in the presence of a significant proportion of potassium.
Keywords:
fluidized-bed incineration; contaminated biomass; corn straw
Available at various institutes of the ASCR
Fluidní spalování kontaminované biomasy III
Ve zprávě byla prokázána možnost účinně spalovat předupravenou kukuřičnou slámu ve fluidním reaktoru se stacionární bublinovou vrstvou za přítomnosti významného podílu draslíku....
Dílčí zpráva výzkumného projektu: Použití mikroreaktorů pro reakce v plynné fázi s heterogenním katalyzátorem
Stavárek, Petr; Křišťál, Jiří; Jiřičný, Vladimír
2013 - Czech
Dílčí výsledky teoretické studie zaměřené na možnosti aplikace mikroreaktorů pro heterogenně katalyzované procesy v plynné fázi. Intermediate results on the theoretical study focused on application of microreactors for gas phase reactions in presence of heterogenous catalyst.
Keywords:
microreactor; catalytic reaction; process intensification
Available at various institutes of the ASCR
Dílčí zpráva výzkumného projektu: Použití mikroreaktorů pro reakce v plynné fázi s heterogenním katalyzátorem
Dílčí výsledky teoretické studie zaměřené na možnosti aplikace mikroreaktorů pro heterogenně katalyzované procesy v plynné fázi....
WP5 Status Report Months 31 to 50
Křišťál, Jiří; Stavárek, Petr; Jiřičný, Vladimír
2013 - English
Within WP5 in this reporting period focused on the development of a new intensified reactor concept for sulph(on)ation reaction. Based on the previous hydrodynamic experiments and mathematical models we designed a new reactor – microSulphonator. We also constructed and manufactured several prototypes that were later tested with model fluids. Experimental data were used for the validation of the models defined previously. Results of this period served as a basis for the final microSulphonators to be tested in the PGB pilot plant during the demonstration phase of the F3 project.
Keywords:
microreactor desing; gas-liquid reaction; pilot plant demonstration
Available at various institutes of the ASCR
WP5 Status Report Months 31 to 50
Within WP5 in this reporting period focused on the development of a new intensified reactor concept for sulph(on)ation reaction. Based on the previous hydrodynamic experiments and mathematical models ...
Edge Effects in Rotational Viscometry III. ZZ and KK Sensors, Total Slip Pseudosimilarity
Wein, Ondřej
2013 - English
This report presents a next step of our effort in developing a system of corrections on edge effects in rotational AWS viscometry. In the previous two reports [4, 5], the edge corrections are given for Newtonian and pseudoplastic liquids with no-slip (adherence) boundary conditions at solid walls (BC).
Keywords:
edge effects; rotational viscometry; zz and kk sensors
Available on request at various institutes of the ASCR
Edge Effects in Rotational Viscometry III. ZZ and KK Sensors, Total Slip Pseudosimilarity
This report presents a next step of our effort in developing a system of corrections on edge effects in rotational AWS viscometry. In the previous two reports [4, 5], the edge corrections are given ...
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