Wyniki wyszukiwania - Biblioteka Nauki

1

Mechanisms for the improved flotation of inherently hydrophobic graphite in electrolyte solution

100%

Lai Q. , Liao Y. , Liu Z. , He Y. , Zhao Y.

Physicochemical Problems of Mineral Processing

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2018

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tom Vol. 54, iss. 3

944--954

EN

It is well documented that unavoidable ions in a pulp such as Mg2+, Ca2+, and K+ have a significant effect on the interaction for particles, especially for flotation of metallic sulfide minerals and clay minerals. In this study, the effect of electrolytes on the flotation of inherently hydrophobic mineral-graphite was studied. It was found that the zeta potential showed a dramatic decrease, and the reagent adsorption capacity of mineral enhanced in the present of electrolytes. The possible mechanism responsible for improved recovery was investigated by electrokinetic, surface tension and ions adsorption tests. It is likely that the hydrophobic force is stronger than the electrostatic force due to the reduced potential of graphite. This might be in favor of the formation of hydrophobic oil film leading to an increase in the graphite floatability. The experiments provided a new spectacle to study inherently hydrophobic mineral processing with electrolyte solution.

2

Surface tension of sodium dodecyl sulphate in the presence of a simple electrolyte

100%

Adamczyk Z. , Para G. , Warszyński P.

Bulletin of the Polish Academy of Sciences. Chemistry

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1999

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tom Vol. 47, No. 2

175-186

EN

Surface tension of aqueous solutions of sodium dodecyl sulphate (SDS) was measured by the drop-weight method, at various KCl concentrations. A significant reduction of the solution surface tension was observed with increasing electrolyte concentration in accordance with previous literature data obtained for NaCl. The experimental results were quantitatively interpreted in terms of the new theoretical model based on the as-sumption that the counterions penetrate the Stern layer and undergo specific adsorption there. The model proved superior over previously used in the literature reflecting well both the experimental surface tension data and the diffuse double layer potentials.

3

Low power solid oxide fuel cells with new electrolytes

88%

Pasciak G. , Purmann M. , Mazurek B. , Styczynski Z.

Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

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2004

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tom Vol. 40, nr 15

271-275

EN

Within the framework of a project between the University of Magdeburg and the Electrotechnical Institute of Wroclaw, material compositions for electrodes and electrolytes which make possible fuel cell operation at a temperature of approxomately 600°C and, moreover, have low production costs will be developed. The exploration of new electrolytes as well as the prototyping of test cells is being undertaken by the Electrotechnical Institute. The test as well as the investigations of the performance of the cells is made in a specially developed testing procedure and test bench. During the installation and enlargement of a PEM-fuel cell test bench at the University of Magdeburg extensive experience was gained. These experiences can now be used for the design of a small SOFC-test bench. The paper gives an overview on the development of the test bench, the electrolytes and initial results.

4

Priroda korrozionno-mekhanicheskogo iznashivanija oborudovanija pishhevojj i pererabatyvajushhejj promyshlennosti

88%

Sukhenko J. , Dzjub A. , Sukhenko V. , Manuilov V.

Motrol. Motoryzacja i Energetyka Rolnictwa

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2014

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tom 16

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nr 3

5

Li-S battery recycling

88%

Siczek K.

Research in Logistics & Production

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2019

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tom Vol. 9, No. 2

125--135

EN

Lithium-ion batteries are not situable for electric vehicles with high millage, military power supplies and fixed power networks. Therefore, the Li-S batteries have been intensively investigated, due to the high capacity, low cost, widespread source, and nontoxicity. The development of Li-S batteries causes increasing need to find the methods for their recycling. Some of them are discussed in the paper. The recycling of Li-S cell relates to its anode, cathode, electrolyte, binder and separator. The Li-S battery should be fully charged before recycling. There are potential methods for recycling of lithium from anodes, especially by re-melting. It is also possible to recycle some materials from the cathodes, especially sulfur by re-melting and graphite by dry crushing, Eco-bat Technologies method or the method investigated by Xiang et al. There is no effective recycling methods for electrolytes, binders and separators. It is necessary to carry out further studies on them.

6

Steady-state current at microelectrodes for arbitrarily charged species and various concentrations of supporting electrolytes

75%

Ciszkowska M.

Chemia Analityczna

|

1999

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tom Vol. 44, No. 3A

391-403

EN

Equations for the dependence of the limiting steady-state current on concentration of supporting electrolyte for arbitrarily charged species were developed based on the gen-eral theory of steady-state voltammetry by Myland and Oldham [ 1 ]. The only limitations of the proposed model are that the electrode reaction must result in the neutral product and that diffusion coefficients of all species do not differ significantly. Theoretical pre-dictions presented as a ratio of the limiting current, II, to diffusional current, Id, are compared with experimental data for reduction of TI+ and Cd+2 at mercury film microele-ctrodes in solutions ofvarious concentrations and types of supporting electrolyte. Exper-imental results agree well with theoretical predictions.

PL

Opierając się- na ogólnej teorii Miland i Oldhama [I] wyprowadzono równania na zależności granicznego prądu stacjonarnego od stężenia elektrolitu podstawowego dla dowolnie wybranych ładunków jonów. Model jest ograniczony do nienaładowanych produktów reakcji elektrodowych i do zbliżonych współczynników dyfuzji. Przewi-dywania teoretyczne porównano z eksperymentalnymi falami redukcji TI+ i Cd2+ na błonkowych mikroelektrodach w roztworach różnych elektrolitów. Zgodność była dobra.

7

Measurements of AlGaN/GaN heterostructures for sensor applications

75%

Hojko M. R. , Paszuk D. , Paszkiewicz B.

Optica Applicata

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2013

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tom Vol. 43, nr 1

35--38

EN

In the paper, the behavior of AlGaN/GaN HEMT-type heterostructures in a water solution of (KOH + HCl) with differing pH was studied. The influence of the electrolyte pH on channel pinch-off voltage was measured using impedance spectroscopy methods. It was observed that the change of the pH of electrolyte has a strong effect on the pinch-off voltage of AlGaN/GaN HEMT-type heterostructures independently of the concentration of other ions. In high-pH environment the so-called memory effect of heterostructures was revealed. Its possible origin was discussed. A general theory to explain all results was proposed.

8

Tlenkowe przewodniki superjonowe bivox domieszkowane pierwiastkami ziem rzadkich (La, Pr).

75%

Paściak G. , Chmielowiec J. , Bujło P.

Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

|

2006

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tom Vol. 44, nr 18

122-127

PL

Materiały z rodziny B1VOX (ang. Bismuth Vanadium Oxide) charakteryzują się dużą przewodnością jonową w stosunkowo niskich temperaturach i dlatego są potencjalnymi kandydatami na materiał elektrolityczny w urządzeniach elektrochemicznych takich jak: ogniwa paliwowe IT-SOFC (Intermediate Temperaturę Solid Oxide Fuel Celi) oraz pompy, separatory i czujniki tlenu. Stosując dodatki podstawiające atomy Bi i V w strukturze Bi4V2O11 można -stabilizować poszczególne odmiany polimorficzne materiału, a także modyfikować jego przewodność. Publikacja przedstawia badania autorów dotyczące wpływu dodatków pierwiastków ziem rzadkich -La i Pr na stabilność termodynamiczną i przewodność elektrolitu Bi4V2O11.

EN

BIVOX (Bismuth Vanadium Oxide) family materials are characterized by high ionic conductivity at relatively low temperature that's why are potential candidates for electrolytic materials used in electrochemical devices as: IT-SOFC (Intermediate Temperature Solid Oxide, Fuel Cell), oxygen pumps, separators and sensors. Applying additives, which substitute Bi and V atoms in the Bi4V2O11structure, one can stabilize individual polymorphic modifications as well as modify theirs conductivity. Present paper presents description of research concerning investigations of the influence of additives - rare-earth elements as La and Pr - on thermodynamic stability and ionic conductivity of Bi4 V2 O11 electrolyte.

9

Distributions of the local shear rate values in boundary layer of the agitataed vessel

75%

Broniarz-Press L. , Różańska S.

International Journal of Applied Mechanics and Engineering

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2005

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tom Vol. 10, no spec

213-218

EN

The results of experimental studies on the distribution of shear rate on the vertical wall agitated vessel, equipped with four various impellers, have been presented. The experimental studies were carried out for two model polymer solutions, carboxymethylcellulose sodium salt (Na-CMC) and guar gum. The experimental results of the local shear rate distribution in non-Newtonian liquid agitated by different impellers, have been presented. It has been established that for studies on hydrodynamics in boundary layer and evaluation of local values of shear rate in Na-CMC and guar gum aqueous solutions by the electrochemical method the following solution of 0.005 [kmol/m3] K3[Fe(CN)6], 0.005 [kmol/m3] K4[Fe(CN)6] and 0.3 [kmol/m3] K2SO4 can be recommended. The greatest values of shear rate have been obtained for Rushton turbine whereas the lowest values occurred for paddle with 6 pitched blade of the angles of 135°.

10

Ocena możliwości współpracy akumulatora sodowo-siarkowego z silnikiem spalinowym

75%

Siczek K. , Siczek K.

Autobusy : technika, eksploatacja, systemy transportowe

|

2017

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tom R. 18, nr 6

1063--1066, CD

PL

W artykule omówiony został akumulator sodowo-siarkowy. Scharakteryzowano jego anodę, katodę i elektrolit. Omówiono konfigurację akumulatora Na-S oraz czynniki wpływające na jego pracę. Przedyskutowano możliwość wykorzystania akumulatora Na-S do współpracy z silnikiem spalinowym pojazdu.

EN

The article discussed a sodium-sulfur battery. It was characterized the anode, cathode and electrolyte. It was also discussed the configuration of the Na-S battery and factors influencing battery operation. It was analyzed the possibility of use the battery Na-S for cooperation with an internal combustion engine in the vehicle.

11

Effect of the strong electrolyte addition on rheological properties of aqueous solutions of sodium carboxymethyl cellulose

75%

Broniarz-Press L. , Różański J. , Dryjer S. , Bednarz J.

International Journal of Applied Mechanics and Engineering

|

2003

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tom Vol. 8, no spec.

207-212

EN

The object of the studies was to determine the effect of leading of various additives to different molecular masses (Mw = 250000 and Mw = 700000) Na-CMC aqueous solutions on the change of rheological properties of these solutions. The additives studied were sodium sulphate, sodium chloride, potassium chloride, sodium carbonate, potassium ferricyanide and ferrocyanide, sodium hydroxide as potentially useful in electrochemical technique. It has been shown that the presence of salt in a solution causes the decrease of consistency index and the increase of flow behaviour index as well as leads to better stabilization of solution (what results probably from the biodegradation slowing down a polymer studied). Additionally in the solutions of this type the electrochemical process has been carried out. No effect of the passage of current on rheological properties has been observed.

12

High-temperature solid-oxide fuel cells New trends in materials research

75%

Molenda J.

Materials Science Poland

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2006

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tom Vol. 24, No. 1

5--11

EN

The paper is an overview of basic solid-oxide fuel cells (SOFC) components in terms of their fundamental functional parameters such as chemical stability, transport as well as catalytic and thermomechanical properties under, operational conditions in a fuel cell. An interrelation between the defect structure of these materials related to oxygen nonstoichiometry and their electronic properties and catalytic activity is shown. A single-chamber fuel cell concept is also presente

13

Symulacja komputerowa procesu ECM w oparciu o dwuwymiarowy model przepływu elektrolitu między płaskimi elektrodami

75%

Paczkowski T. , Sawicki J.

Zeszyty Naukowe. Mechanika / Akademia Techniczno-Rolnicza w Bydgoszczy

|

2002

|

tom Z. 53(241)

171-180

PL

W pracy przedstawiono symulację komputerową procesu ECM w oparciu o dwuwymiarowy model przepływu mieszaniny elektrolitu i wodoru w szczelinie między elektrodowe). Zagadnienie rozwiązano częściowo analitycznie, częściowo numerycznie uzyskując rozkłady: grubości szczeliny międzyelektrodowej, gęstości prądu, ciśnienia, prędkości przepływu elektrolitu, temperatury, koncentracji objętościowej wodoru.

EN

This paper presents the computer simulation of the ECM process, on the basis of two-dimensional model of the flow of electrolyte and hydrogen mixture in the gap between the electrodes. This problem was solved partly analytically, partly numerically, obtaining distributions of: thickness of the gap, density current, pressures, speeds of flow of electrolyte, temperatures, of concentration of hydrogen by volume.

14

Zastosowanie cieczy jonowych zawierających grupy HSO4– w ogniwach kwasowo-ołowiowych

75%

Lota G. , Baraniak M. , Wasiński K. , Jankowska E.

Przemysł Chemiczny

|

2013

|

tom T. 92, nr 9

1624-1626

PL

Przedstawiono wyniki badań nad wykorzystaniem cieczy jonowych zawierających aniony wodorosiarczanowe(VI) w elektrolitach akumulatorów ołowiowych. Scharakteryzowano preparatykę żelowego elektrolitu polimerowego, wykazano wysoką czystość oraz stabilność termiczną uzyskanego polimeru. Wyniki badań elektrochemicznych modelowych ogniw typu Pb |ciecz jonowa| PbO2 potwierdziły, że polimerowa ciecz jonowa może stanowić składnik żelowego elektrolitu.

EN

(CH2=CHCH2)2Me2N+Cl- was polymerized in aq. soln., converted to hydrogen sulfate(VI) with H2SO4 and added (7.5%) to H2SO4 used in Pb battery. The electrochem. and electrical properties of Pb |ionic liq.| PbO2 model system showed applicability of the polymeric ionic liq. as a new component of gel electrolyte.

15

Metodika issledovanija processov korrozionno-mekhanicheskogo iznashivanija oborudovanija pishhebykh i pererabatyvajushhikh proizvodstv

75%

Dzjub A. , Sukhenko V. , Manuilov V. , Sukhenko J.

Motrol. Motoryzacja i Energetyka Rolnictwa

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2014

|

tom 16

|

nr 3

16

Dobór ekologicznego elektrolitu do polerowania elektrochemicznego stopów aluminium

75%

Zaborski S. , Łupak M. , Poroś D. , Michalski M.

Zeszyty Naukowe Politechniki Poznańskiej. Budowa Maszyn i Zarządzanie Produkcją

|

2004

|

tom Nr 1

383-388

PL

W artykule podjęto próbę opisania postępowania przy wyborze i określaniu parametrów pracy elektrolitu. Sporządzono kilka elektrolitów alkaicznych do elektropolerowania stopu aluminium PA6 o możliwie korzystnym działaniu i składnikach łatwych do utylizacji.

EN

It became evident that out of proposed alkaline electrolytes E3, E4, E5, E6, E7 in which sodium carbonate and sodium phosphate were the main ingredients, most effective was the E4 of pH 9. It was reached in this one brightening and greatest decrease of surface roughness, in average 20%. 3% addition of ferric chloride to this electrolyte (E6 electrolyte) worsened its effectiveness. Increase of pH by 1 (electrolyte E3) decreased effects of electropolishing as well. Addition of ferric chloride to E3 electrolyte (E5 electrolyte) caused sample etching and not polishing. However decrease of pH to 8 (E7 electrolyte) caused intensive etching.

17

The effect of NaCl electrolyte on rheological properties of the different clay types

75%

Esmer K. , Gungor N.

Applied Mechanics and Engineering

|

1999

|

tom Vol. 4, no spec.

203-206

EN

In this study, we have investigated clay dispersions as a the rheologic characteristics of four different function NaCl electrolyte concentration. In the presence of NaCl electrolyte in clay / water system; clay mineral particles can aggregate in different ways; association between edge surface of neighboring particles (edge-to-edge,EE); and association between flat oxygen planes of two parallel platelets (face-to-face) association between edge surfaces and a flat oxygen planar surface (edge-to-face, EF). Electrolytes can increase or decrease the stability of the networks. The formation of gel structures with water, can be altered by the addition of NaCl and that, in this process, the type of clay, the type of the electrolyte and the concentration are influental factors.

18

Utilization of the waste products of the copper industry of application of post-rafinement electrolites

63%

Nowakowski J. , Bukiej W.

Metallurgy and Foundry Engineering

|

2002

|

tom Vol. 28, no. 1

65-71

EN

The authors present their investigation of the possibility of applying waste post-refinement electrolytes after preliminary copper elimination to etching of solid waste materials containing heavy metals and increased amount of arsen. The processes of dissolving these materials in the electrolyte, neutralisation of the obtained solution and thermal decomposition of the obtained pulp were carried out. The result of these processes was the separation of heavy metals (sediment) and arsen (solution).

PL

Praca przedstawia badania nad możliwością zastosowania odpadowych elektrolitów porafinacyjnych - wstępnie odmiedziowanych, do ługowania kwaśnego stałych materiałów odpadowych przemysłu miedziowego, zawierających metale ciężkie i podwyższony arsen. Wybrano materiały pyliste - pochodzące z jednego węzła technologicznego, które zawierały jako główne składniki: miedź, cynk, arsen oraz pewne ilości ołowiu i żelaza. Materiały te poddano rozpuszczeniu w odpadowym elektrolicie porafinacyjnym, następnie otrzymany roztwór poddano dokwaszeniu, by zwiększyć w nim zawartość miedzi i arsenu, a otrzymany osad zawierał głównie siarczan ołowiu. Otrzymany roztwór poddano neutralizacji i termicznemu rozkładowi, by rozdzielić miedź i nikiel od arsenu. W wyniku tych procesów otrzymano roztwór - o podwyższonej zawartości arsenu i osad, składający się z miedzi i niklu w postaci utlenionej. Na postawie przeprowadzonych badań zaproponowano schemat technologiczny przerobu materiałów odpadowych, zawierających metale ciężkie i podwyższony arsen.

19

Studies of vapour pressure of volatile electrolytes over NH3 - CO2 - H2O solutions

63%

Krop J.

Polish Journal of Applied Chemistry

|

1998

|

tom Vol. 42, nr 1

13-21

EN

In the paper the results are presented of the studies on solution properties and phase equilibria of the NH3-COz-Hz0 ternary system occurring in processes of waste gas purifcation. A simple correlation formula is proposed for total pressure over the solution as related to its temperature and composition.

20

Simulation and characterization of SOFC fuel cell model

63%

Mankour M. , Sekour M. h. , Koulali M.

Przegląd Elektrotechniczny

|

2022

|

tom R. 98, nr 7

18--24

EN

The SOFC fuel cell is one of the so-called solid electrolyte fuel cells that operate at high temperatures of 650 to 1200°C. This temperature level is necessary for the solid electrolyte to have sufficient ionic conductivity. This high temperature causes a very high heat exchange between the various components of the SOFC. In the 1-D model, the fuel cell is usually treated as a set of layers including interconnects, air channel, electrodes, electrolyte, and fuel channel both gas composition and flow rate in each channel are assumed to be constant, and their mean values are used in the simulation.

PL

Ogniwo paliwowe SOFC należy do tzw. ogniw paliwowych ze stałym elektrolitem, które pracują w wysokich temperaturach od 650 do 1200°C. Ten poziom temperatury jest konieczny, aby elektrolit stały miał wystarczającą przewodność jonową. Tak wysoka temperatura powoduje bardzo dużą wymianę ciepła pomiędzy poszczególnymi elementami SOFC.