Autor: Adamczyk, Zbigniew - Katalog OPAC zbiorów

Tytuł:: Ammonia CI engine aftertreatment systems design and flow simulation
Autorzy:: Kuta, Kacper
Nadimi, Ebrahim
Przybyła, Grzegorz
Żmudka, Zbigniew
Adamczyk, Wojciech
Powiązania:: https://bibliotekanauki.pl/articles/2097643.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:: ammonia
selective catalytic reduction
SCR
compression ignition engine
test rig
emissions
amoniak
selektywna redukcja katalityczna
silnik o zapłonie samoczynnym
stanowisko badawcze
emisje
Opis:: Investigation of exhaust emissions and ammonia flow behavior in the exhaust system incorporating with Selective Catalytic Reduction (SCR) unit is discussed. An aftertreatment system is designed to work without additional urea injection. This study is focused on obtaining optimal parameters for catalysis. Its effectiveness is considered as a function of basic parameters of exhaust gases mixture and SCR material characteristics. A 3D geometry of SCR with porous volume has been simulated using Ansys Fluent. Moreover, a 1D model of ammonia dual-fuel CI engine has been obtained. Results were focused on obtaining local temperature, velocity, and exhaust gases composition to predict optimal probes placement, pipes insulation parameters, and characteristic dimensions.
Źródło:: Combustion Engines; 2022, 61, 3; 3--10
2300-9896
2658-1442
Pojawia się w:: Combustion Engines
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Titanium dioxide/silver nanoparticle bilayers prepared in self-assembly processes
Autorzy:: Maciejewska, Julia
Oćwieja, Magdalena
Adamczyk, Zbigniew
Bielańska, Elżbieta
Napruszewska, Bogna
Powiązania:: https://bibliotekanauki.pl/articles/764113.pdf
Data publikacji:: 2016
Wydawca:: Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Opis:: A new method for the preparation of TiO2/Ag bilayers via colloid self-assembly process using well-characterized titanium dioxide and silver suspensions was developed. The titanium dioxide nanoparticles, forming a supporting layer, were 46 nm in diameter, exhibiting an isoelectric point at pH 6.4. The silver nanoparticles, forming an external layer of the diameter of 50 nm were prepared via a chemical reduction method with the presence inorganic phosphate salts. The electrophoretic mobility measurements revealed that the zeta potential of silver nanoparticles was highly negative for a broad range of pH and ionic strengths. By explaining this information, the optimum condition for the silver nanoparticle immobilization on TiO2 supporting layers were selected. The coverage of the first layer was adjusted by ionic strength of the suspensions and by the deposition time. Afterward, the silver nanoparticle monolayers of controlled coverage were deposited under the diffusion-controlled transport. Their coverage was determined by a direct enumeration of deposited nanoparticles from AFM images and SEM micrographs. The experimental results showed that for extended deposition times, the coverage of silver nanoparticle layers significantly increases with ionic strength. Therefore, it was proven that the formation of bilayers is mainly controlled by electrostatic interactions and that it is feasible to produce uniform TiO2/Ag materials of desired coverage and structure.
Źródło:: Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2016, 71, 1
2083-358X
Pojawia się w:: Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Modification of solid substrates by controlled adsorption of macroions
Modyfikacja substratów stałych przez kontrolowaną adsorpcję makrojonów
Autorzy:: Morga, Maria
Adamczyk, Zbigniew
Powiązania:: https://bibliotekanauki.pl/articles/1853726.pdf
Data publikacji:: 2021
Wydawca:: Polskie Towarzystwo Chemiczne
Tematy:: adsorption of macroions
electrokinetic characteristics of macroions
PAH and PDDA adsorption
macroion layers on solid substrates
streaming potential measurements
zeta potential of macroion molecules
adsorpcja makrojonów
charakterystyka makrojonów
adsorpcja PAH i PDDA
warstwa makrojonów na powierzchniach ciał stałych
pomiary potencjału przepływu
potencjał zeta makrocząstek
Opis:: Mechanisms of cationic macroion adsorption on negatively charged solid substrates comprising mica and silica were thoroughly discussed. Attention was focused on poly(allylamine hydrochloride) (PAH), poly(dimethyl-diallylammonium chloride) (PDDA) and poly-L-lysine (PLL) widely used in practice. The bulk physicochemical parameters controlling the macroion adsorption such as the diffusion coefficient, hydrodynamic diameter, intrinsic viscosity and electrophoretic mobility were discussed. The latter, experimentally accessible parameter, enables to determine the electrokinetic charge of macroion molecules, their isoelectric points and zeta potentials. On the other hand, the analysis of the hydrodynamic diameter and the intrinsic viscosity data confirmed a largely elongated shape of the molecules even for concentrated electrolyte solution. These results are used for a quantitative interpretation of macroion adsorption at solid substrates investigated using in situ streaming potential measurements. It is confirmed that the macroion mostly adsorb in the side-on orientation forming layers whose maximum coverage can be regulated by the ionic strength of the solution. This streaming potential method can also be used to determine the stability of the layers performing controlled desorption kinetic measurements. It is shown that at pH 7.4 the PDDA and PLL macroions form stable layers on solid substrates, which can be used for an efficient immobilization of negatively charged macroions and bioparticles comprising protein molecules and viruses.
Źródło:: Wiadomości Chemiczne; 2021, 75, 9-10; 1157-1179
0043-5104
2300-0295
Pojawia się w:: Wiadomości Chemiczne
Dostawca treści:: Biblioteka Nauki