Wyniki wyszukiwania - Biblioteka Nauki

1

New ceramic superionic materials for IT-SOFC applications

100%

Paściak G. , Chmielowiec J. , Bujło P.

Materials Science Poland

|

2005

|

tom Vol. 23, No. 1

209--219

EN

The syntheses of new ceramic superionic materials based on Bi2O3 (BIMEVOX and ?-Bi2O3), their elemental analyses, thermodynamical stability, and electrical properties are presented. The materials show high ionic conductivities (ca. 0.1 S/cm) at a relatively low temperature (600 °C), which makes them applicable as electrolytes in IT-SOFC fuel cells. Ionic conductivity measurements of these materials were performed with the DC (four probe configuration) and IS (impedance spectroscopy) methods, whereas structural research was performed using X-ray spectroscopy. Investigations of the thermodynamic stability of the elaborated materials in oxygen-free atmosphere were also performed. Based on the results of the investigations, the most suitable superionic conductors for fuel cell were selected.

2

Sol-gel derived Li-ion conducting polymer electrolytes

100%

Żelazowska E. , Rysiakiewicz-Pasek E. , Borczuch-Łączka M.

Materials Science Poland

|

2005

|

tom Vol. 23, No. 1

177--194

EN

Organic-inorganic hybrids have recently become a remarkable family of amorphous polymer materials with promising potential applications. In the present study, sol-gel derived organic-inorganic hybrid electrolytes doped with lithium salts (LiCl, LiClO4) were produced from inorganic and organic precursors such as tetraethyl orthosilicate, poly(ethylene oxide), poly(ethylene glycol), propylene oxide, propylene carbonate, ethylene glycol, and 1,2-propylene glycol. The hybrid electrolytes were obtained in the form of flexible or glassy materials depending on the composition and heat treatment temperature (ranging from 80 to 125 ?C). The morphology, structure and elemental chemical composition of the electrolytes obtained were examined by scanning electron microscopy equipped with energy dispersive X-ray spectroscopy (SEM/EDS), FTIR spectroscopy, and X-ray diffraction (XRD). Infrared spectroscopy and SEM observation results indicate that the structural properties of the synthesized materials are significantly influenced by organic additives and the sol-gel preparation procedure. The formation of organic group-O-Si linkages was confirmed by infrared spectra in all of the electrolytes obtained. The results of FTIR analysis are in a good agreement with 13C and 1H MAS NMR spectroscopy measurements performed for the hydrolysed sols immediately before the gel transformation process and at early gel stages. These results have revealed an enhanced duration of the cross-linking process in the species prepared with low molecular mass glycols. Cells in an electrochromic window arrangement were prepared in order to observe the photometric and cyclic voltammetry characteristics of thin-film electrochromic systems with the investigated hybrid materials employed as electrolytes. The results indicate that the inorganic-organic hybrids synthesized in this work are promising electrolytes for thin film electrochromic systems based on WO3.

3

Conductivity of 1-Butyl-3-methyl-imidazolium Chloride Solutions in Alcohols

100%

Domańska U. , Bogel-Łukasik E.

Polish Journal of Chemistry

|

2006

|

tom Vol. 80, nr 1

189-203

EN

This work presents the ionic conductivity of 1-butyl-3-methylimidazolium chloride [bmim][Cl]'s solutions in alcohols (ethanol, 1-butanol, 1-hexanol, 1-octanol, 1-decanol, 2-butanol, 2-methyl-2-propanol) and that of pure alcohols measured in wide range of temperature and concentration. The values of limiting conductance were determined by the Onsager limiting law. The molar conductivities of these systems were presented as a function of temperature and concentration. The mathematical description of ionic conductivities data by the Vogel-Tammen-Fulcher equation was made. It was shown that the conductivity of [bmim][Cl]'s solutions in the relatively low dielectric constant media is affected by the length of an alcohol carbon chain.

4

Preparation of cubic alumina and scandia doped zirconia and its thin film fabrication by pulsed laser deposition technique

100%

Karthikeyan M.

Materials Science Poland

|

2014

|

tom Vol. 32, No. 1

45--49

EN

Alumina and scandia doped zirconia was prepared through a soft chemistry synthesis route and sintered at 1873 K. X-ray diffraction patterns indicate a pure cubic phase for the composition of 0.88ZrO2–0.112Sc2O3–0.008Al2O3. Thin films were fabricated on Al2O3 <0001> substrates using pulsed laser deposition technique. Dense films of 0.941 m thickness were obtained at 873 and 1023 K substrate temperatures at an oxygen partial pressure of 15 Pa. The ionic conductivity of both thin film and sintered pellet was measured using ac impedance spectroscopy in air. The conductivity values are higher for thin films compared to that of sintered pellets.

5

Hybrid materials doped with lithium ions

100%

Zelazowska E. , Rysiakiewicz-Pasek E.

Optica Applicata

|

2010

|

tom Vol. 40, nr 2

383--396

EN

Sol–gel derived lithium-ion conducting organic–inorganic hybrid materials have been synthesized from tetraethyl orthosilicate (TEOS), propylene glycol, ethylene glycol dimethacrylate, poly(vinyl alcohol), vinyl acetate, ethyl acetoacetate, poly(methyl methacrylate), propylene carbonate and some other precursors and solvents. The mass fraction of the organic additions in the gels and the level of the lithium salt doping (LiClO4) were ~40 mass% and 0.01%, respectively. The morphological and structural properties of the gels were investigated by a scanning electron microscope equipped with energy dispersive X-ray spectroscopy (SEM/EDX), X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FTIR) and 29Si MAS Nuclear Magnetic Resonance (29Si MAS NMR). The hybrid gels obtained were amorphous and colourless transparent or slightly opalescent, with the room temperature ionic conductivities of the order of 10–3 Scm–1. The results of FTIR spectroscopy and 29Si MAS NMR investigations have revealed strong influence of the organic modification, resulting in the direct chemical bonding between organic and inorganic components of the gels. The WO3-based electrochromic cells with the hybrids obtained being applied as the electrolytes were able to be reversibly coloured and bleached in the optical transmittance range of ~58% to 5% at around 550 nm.

6

Fabrication of yttria stabilized zirconia nanoparticles by the reverse microemulsionmethod for SOFC applications

100%

Vatansever S. , Öksüzömer F. , Naci Koç S. , Somer M. , Deligöz H. , Gürkaynak M. A.

Materials Science Poland

|

2010

|

tom Vol. 28, No. 1

85--91

EN

Yttria stabilized zirconia powders were synthesized by the reverse microemulsion method. Powders were calcined from 600 °C to 1000 °C and sintered at 1450 °C. Crystalline properties and microstructure of samples were characterized by X-ray diffraction and scanning electron microscopy, respectively. Oxygen ionic conductivity was measured by electrochemical impedance spectroscopy. Sizes of yttria stabilized zirconia particles calcined at 1000 °C are lower than 100 nm, and approximately, 1 žm grain was obtained after sintering at 1450 °C.

7

Stability of Garnet-Type Li7La3Zr2O12-Based Ceramics for All-Solid-State Batteries

100%

Yi E.-J. , Yoon K.-Y. , Jung H.-A. , Hwang H.

Archives of Metallurgy and Materials

|

2019

|

tom Vol. 64, iss. 2

579--583

EN

Al and Nb-doped Li7 La3 Zr2O12 (LLZO) and W-doped LLZO lithium ion conducting electrolyte samples were prepared and their H2O stability was investigated. The LLZO samples were exposed to 50% humidified air for 48 h. After H2O exposure, a cubic to tetragonal transformation occurred and acquired SEM images exhibited the presence of reaction phases at the grain boundaries of Al and Nb-LLZO. As a result, the lithium ion conductivity significantly decreased after H2O exposure. On the contrary, W-LLZO showed good stability against H2O. Although the cubic to tetragonal transformation was also observed in H2O-exposed W-LLZO, the decrease in lithium ion conductivity was found to be modest. No morphological changes of the W-LLZO samples were confirmed in the H2O-exposed W-LLZO samples.

8

Subsolidus solution and ionic conductivity of rock-salt structured Li3+5xTa1−xO4 electroceramics

100%

Shari S. , Tan K. B. , Khaw C. C. , Zainal Z. , Lee O. J. , Chen S. K.

Materials Science Poland

|

2020

|

tom Vol. 38, No. 3

465--474

EN

Lithium tantalate solid solution, Li3+5xTa1−xO4 was prepared by conventional solid-state reaction at 925 °C for 48 h. The XRD analysis confirmed that these materials crystallized in a monoclinic symmetry, space group C2/C and Z = 8, which was similar to the reported International Crystal Database (ICDD), No. 98-006-7675. The host structure, β-Li3TaO4 had a rock-salt structure with a cationic order of Li+:Ta5+ = 3:1 over the octahedral sites. A rather narrow subsolidus solution range, i.e. Li3+5xTa1−xO4 (0 ⩽ x ⩽ 0.059) was determined and the formation mechanism was proposed as a replacement of Ta5+ by excessive Li+, i.e. Ta5+ ↔ 5Li+. Both Scherrer and Williamson-Hall (W-H) methods indicated the average crystallite sizes in the range of 31 nm to 51 nm. Two secondary phases, Li4TaO4.5 and LiTaO3 were observed at x = 0.070 and x = −0:013, respectively. These materials were moderate lithium ionic conductors with the highest conductivity of ~2.5 × 10-3 Ω -1∙cm-1 at x = 0, at 0 °C and 850 °C; the activation energies were found in the range of 0.63 eV to 0.68 eV.

9

Determination of ionic conductivity in the Bi-Si-O and Pb-Si-O glasses

100%

Karczewski J. , Miruszewski T. , Bochentyn B. , Kusz B.

Materials Science Poland

|

2017

|

tom Vol. 35, No. 4

681--686

EN

Impedance spectroscopy measurements in various gas atmospheres were carried out in order to explain the doubts about the type of carriers and the mechanism of electrical conductivity in Bi-Si-O and Pb-Si-O glasses. In bismuth silicate glass, a typical ionic conductivity with oxygen ions as charge carriers was observed. The level of electrical conductivity of the glass at 400 °C was 5 × 10-8 S·cm-1, with the activation energy of 1.3 eV and was independent of measuring atmosphere. In the case of lead silicate glasses, the conductivity changed with measuring atmosphere. Two types of charge carriers: oxygen ions and proton ions were postulated. Proton conductivity measured in wet argon at temperature 400 °C was estimated at the level of 4 × 10-8 S·cm-1 while the oxygen ions conductivity in such conditions was 78 × 10-8 S·cm-1. We suggest that both types of charge carriers are transported along the same conduction paths using oxygen defects in the glass structure.

10

Some structural aspects of ionic conductivity in zirconia stabilised by yttria and calcia

88%

Bućko M. M.

Materials Science Poland

|

2006

|

tom Vol. 24, No. 1

39--44

EN

Nanopowders with nominal constant oxygen vacancy concentrations of 8, 10, and 12 mol % were prepared in the ternary ZrO2-CaO-Y2O3 system. The constant oxygen vacancy concentrations were obtained by incorporating calcia and yttria into zirconia solid solutions at different ratios. The Rietveld refinement method was used to characterise the structural changes in the zirconia solid solution. X-ray diffraction analysis was also used to characterise the phase composition of the samples and lattice parameters of the cubic phase. The four-probe method was applied for determining electrical properties of the samples. The conduction properties of the samples were characterised with respect to their structural features.

11

Preparation and characterization of PEO-based composite gel-polymer electrolytes complexed with lithium trifluoro methane sulfonate

88%

Nagajothi A. J. , Kannan R. , Rajashabala S.

Materials Science Poland

|

2018

|

tom Vol. 36, No. 2

185--192

EN

Chitosan has been successfully incorporated as a filler in a polyethylene oxide (PEO) and lithium trifluoromethanesulfonate (LiCF3SO3) matrix with a combination of plasticizers, namely 1,3-dioxolane (DIOX) and tetraethylene glycol dimethylether (TEGDME). The composite gel-polymer electrolyte (CGPE) membranes were prepared by solution casting technique in an argon atmosphere. The prepared membranes were subjected to SEM, TG/DTA and FT-IR analyses. A Li/CGPE/Li symmetric cell was assembled and the variation of interfacial resistance was measured as a function of time. The lithium transference number (Li+t) was measured and the value was calculated as 0.6 which is sufficient for battery applications. The electrochemical stability window of the sample was studied by linear sweep voltammetry and the polymer electrolyte was found to be stable up to 5.2 V.

12

Badania konduktywności nietoksycznego elektrolitu organicznego do superkondensatorów

75%

Szmaja A. , Szubzda B.

Przegląd Elektrotechniczny

|

2010

|

tom R. 86, nr 11a

349-352

PL

Przedstawiono prace nad dobraniem układu dwóch rozpuszczalników organicznych, z których jeden charakteryzuje się dużą zdolnością do dysocjacji rozpuszczonych w nim związków jonowych, drugi – niską lepkością. Badano konduktywność elektrolitów organicznych przy różnych stężeniach soli litu LiClO4, gdzie podstawowym rozpuszczalnikiem polarnym był węglan propylenu (PC), a współ-rozpuszczalnik poprawiający lepkość stanowiły kolejno: benzen, DEC, dioksan, DMC, DME, EC, THF w różnych proporcjach do PC.

EN

Works on creation electrolyte of two organic solvents are presented, one of which has a large ability for the dissociation of dissolved ionic compound, the second - a low viscosity. Conductivity of organic electrolytes has been studied at different concentrations of lithium salts LiClO4, where the primary polar solvent was propylene carbonate (PC), and co-solvent improves the viscosity were successively: benzene, DEC, dioxane, DMC, DME, EC, THF in different proportions to the PC.

13

Some observations on the synthesis and electrolytic properties of (Ba1-xCax)(M0.9Y0.1)O-3, M = Ce, Zr-based samples modified with calcium

75%

Dudek M. , Lis B. , Rapacz-Kmita A. , Gajek M. , Raźniak A. , Drozdz E.

Materials Science Poland

|

2016

|

tom Vol. 34, No. 1

101--114

EN

In this paper, the impact of partial substitution of calcium for barium in (Ba1-xCax)(M0.9Y0.1)O3, M = Ce, Zr on physicochemical properties of the powders and sintered samples was investigated. The powders, with various contents of calcium (x = 0, 0.02, 0.05, 0.1), were prepared by means of thermal decomposition of organometallic precursors containing EDTA. All of the BaCeO3-based powders synthesised at 1100 degrees C were monophasic with a rhombohedral structure, however, completely cubic BaZrO3-based solid solutions were obtained at 1200 degrees C. A study of the sinterability of BaZr0.9Y0.1O3 and BaCe0.9Y 0.1O3-based pellets was performed under non-isothermal conditions within a temperature range of 25 to 1200 degrees C. The partial substitution of barium for calcium in the (Ba1-xCax)(M0.9Y0.1)O-3, M = Ce, Zr solid solution improved the sinterability of the samples in comparison to the initial BaCe0.9Y 0.1O3 or BaZr0.9Y 0.1 O3. The relative density of calcium-modified BaCe0.9Y 0.1O3-based samples reached approximately 95 to 97 % after sintering at 1500 degrees C for 2 h in air. The same level of relative density was achieved after sintering calcium-modified BaZr0.9Y 0.1O3-at 1600 degrees C for 2 h. Analysis of the electrical conductivity from both series of investigated materials showed that the highest ionic conductivity, in air and wet 5 % H2 in Ar, was attained for the compositions of x = 0.02 to 0.05 (Ba1-xCax)(M0.9Y0.1)O3, M = Zr, Ce. The oxygen reduction reaction on the interface Pt vertical bar BaM0.9Y 0.1O3, M = Ce, Zr was investigated using Pt microelectrodes. Selected samples of (Ba1-xCax)(M0.9Y0.1)O3, M = Zr, Ce were tested as ceramic electrolytes in hydrogen-oxygen solid oxide fuel cells operating at temperatures of 700 to 850 degrees C.

14

Polymeric ionic liquids

75%

Sverdlikovska O. , Burmitr M. , Chervakov O.

Modelowanie Inżynierskie

|

2021

|

tom T. 42, nr 73

69--75

EN

The work is devoted to the development of scientific foundations for the production of polymeric ionic liquids and ionic liquids of ionen type based on morpholine with high ion conductivity in a wide range of temperatures. Established the dependencies of their physic-chemical properties on structure and external factors (solvent, temperature, etc.) for solving urgent macromolecular chemistry problems.Ion conductivity, its increases with decreasing of anion size, melting point (glass transition), and molecular mass of ionic liquids.The melting point (glass transition) of polymeric ionic liquids and ionic liquids of ionen type decreases with decreasing anion size and molecular weight. It was established that the new polymeric ionic liquids and water morpholine-based liquids have a significantly higher level (four to fifteen orders) of ionic conductivity (~ 10–1–10–6 Sm·cm–1) without properties changing in temperature range –280С ÷ –1350С in comparison with the world known analogues on the basis of polymeric ionic liquids.

15

Wpływ składu chemicznego na spiekalność i przewodnictwo jonów litu w La2/3-xLi3xTiO3 – ceramicznym elektrolicie stałym o strukturze perowskitu

63%

Polczyk T. , Zając W. , Świerczek K.

Materiały Ceramiczne

|

2017

|

tom T. 69, nr 1

28--32

PL

Wydajność nowej generacji akumulatorów litowych typu all-solid-state, które w przyszłości mogą stać się bezpieczniejszą alternatywą dla tradycyjnych akumulatorów Li-ion, będzie zależała m.in. od możliwości zastosowania elektrolitów stałych o wysokim przewodnictwie jonowym. Transport jonów w polikrystalicznych spiekach jest złożonym zjawiskiem, na które wpływają zarówno ruchliwość i koncentracja nośników w sieci krystalicznej, jak i opór granic międzyziarnowych oraz porowatość spieków. Niniejsza praca dotyczy związku pomiędzy składem chemicznym i gęstością względną a przewodnictwem jonowym materiałów z grupy tlenków o strukturze perowskitu La2/3-xLi3xTiO3, wykazujących wysoką ruchliwość jonów litu już w temperaturze pokojowej. Przy użyciu techniki dylatometrycznej wykazano, że w badanym układzie proces reaktywnego spiekania rozpoczyna się powyżej 1000 °C, a całkowity skurcz spiekania, jak i jego dynamika silnie zależą od składu chemicznego spieków; wzrost zawartości litu powoduje wzrost szybkości spiekania i skutkuje większymi wartościami końcowej gęstości względnej. Jednoczesny wpływ koncentracji nośników ładunku w podsieci litu w strukturze krystalicznej La2/3-xLi3xTiO3 i porowatości uzyskiwanych spieków prowadzi do maksymalnej wartości przewodnictwa jonowego wynoszącej 3,5•10-5 S•cm-1 w temperaturze pokojowej dla materiału o składzie La0,59Li0,24TiO3.

EN

Efficiency of a new generation all-solid-state lithium batteries, which in the future have a chance to become a safer alternative for conventional Li-ion batteries, depends, among others, on availability of high ionic conductivity solid electrolytes. Ion transport in a polycrystalline solid is a complex phenomenon affected by mobility and concentration of charge carriers in the crystal lattice as well as the grain boundary resistance and porosity of the sintered body. This work reports on relation between chemical composition, relative density and ionic conductivity in a La2/3-xLi3xTiO3 perovskite-structured oxide which exhibits high lithium-ion mobility already at room temperature. Using a dilatometry technique, it is shown that reactive sintering commences above 1000 °C in the studied system, and the total shrinkage and dynamics of sintering strongly depends on the lithium content – more lithium causes the sintering rate and final relative density increased. Simultaneous effects of the concentration of charge carriers in the lithium sublattice of the La2/3-xLi3xTiO3 crystal structure and the porosity of sintered materials lead to maximum ionic conductivity of 3.5•10-5 S•cm-1 at room temperature for the La0,59Li0,24TiO3 composition.

16

Problemy z myciem ekranów przeciwdźwiękowych

63%

Kunce I. , Wojda D. , Komorowski L. , Królikowska A.

Ochrona przed Korozją

|

2020

|

tom nr 6

198--195

PL

Właściwa konserwacja ekranów przeciwdźwiękowych ma na celu nie tylko poprawę ich estetyki, ale przede wszystkim utrzymanie trwałości zabezpieczeń antykorozyjnych. Dobór metody usuwania zanieczyszczeń z konstrukcji ekranów przeciwdźwiękowych powinien uwzględniać wiele różnorodnych czynników, które przedstawiono w opracowaniu. Plan prac konserwacyjnych dotyczący mycia ekranów przeciwdźwiękowych musi opierać się na wiedzy o odporności korozyjnej materiałów użytych do konstrukcji ekranów, rodzaju usuwanych zanieczyszczeń i oddziaływaniu środków czyszczących na myte powierzchnie i środowisko. Częstotliwość prac konserwacyjnych zależy głównie od środowiska korozyjnego w jakim znajdują się ekrany i rodzaju zastosowanych zabezpieczeń przeciwkorozyjnych. W artykule przedstawiono podział ekranów przeciwdźwiękowych ze względu na konstrukcję i zastosowane materiały, klasyfikację zanieczyszczeń ekranów, rodzaje środków czyszczących oraz podsumowano przegląd literatury pod kątem ogólnych zaleceń dotyczących doboru metod czyszczenia do materiału stosowanego na ekrany przeciwdźwiękowe.

EN

Proper maintenance of noise barriers improves their aesthetics and, above all, maintains the durability of anti-corrosion protection. The selection of the method of removing contaminants from the construction of noise barriers should take into account many different factors presented in the study. The maintenance plan for cleaning noise barriers must be based on the knowledge about the corrosion resistance of materials used for the construction of barriers, the type of removed contaminants and the impact of cleaning agents on the cleaned surfaces and environment. The frequency of maintenance work depends mainly on the corrosive environment in which the screens are located and the type of corrosion protection applied. The article presents the types of noise barriers by construction and materials used, classification of barriers’ contamination, types of cleaning agents and summarizes the literature review in terms of general recommendations for the selection of cleaning methods for the material used for noise barriers.

17

Wodorowe ogniwa paliwowe PEM : badania wpływu natężenia przepływu tlenu na membranę polimerową

63%

Polak A.

Przetwórstwo Tworzyw

|

2017

|

tom T. 23, Nr 2 (176)

123--133

PL

Wodorowe ogniwa paliwowe przekształcają energię chemiczną uwolnioną w czasie reakcji utleniania wodoru w energię elektryczną. Aby to było możliwe, konieczne jest fizyczne rozdzielenie reakcji połówkowych: redukcji i oksydacji. W większości tego typu ogniw tę separację pełni membrana polimerowa. Poza zadaniem rozdzielania przestrzeni anody i katody ogniwa spełnia ona funkcje elektrolitu przenoszącego jony wodoru między elektrodami oraz izolatora ze względu na przewodnictwo elektronowe. W artykule przedstawiono wyniki badań dotyczące wpływu natężenia przepływu tlenu przez przedział katody ogniwa paliwowego na membranę polimerową, a w szczególności jej konduktywność jonową. Przedstawione wyniki badań, wskazują na pośredni wpływ wartości natężenia przepływu tlenu na konduktywność jonową membrany w ogniwach paliwowych PEM.

EN

Hydrogen fuel cells convert chemical energy, released during the hydrogen oxidation reaction, into electric one. To perform this task, it is necessary to separate physically the halfreactions: oxidation and reduction. In most cases, this separation function is carried out by the special polymer membrane. Beside the task of anode/cathode gas separation, it also acts as an electrolyte responsible for proton exchange between electrodes of the cell and also electrically isolates the electrodes from each other to prevent the direct electronic current flow between them. The paper presents the research results related to the influence of the oxygen flow intensity through the cathode of the fuel cell on the polymer membrane and especially on its ion conductivity. The presented results indicate indirect influence of the oxygen flow intensity on the ionic conductivity of the polymer membrane in the PEM fuel cells.

18

Otrzymywanie i właściwości jonowoprzewodzących materiałów poliuretanowych

63%

Leszkowski K. , Haponiuk J. T. , Datta J.

Przemysł Chemiczny

|

2012

|

tom T. 91, nr 10

1999-2002

PL

Przewodzące materiały poliuretanowe otrzymywano w syntezie dwuetapowej. W pierwszym etapie syntetyzowano prepolimer uretanowy. W reakcji stosowano 4,4’-diizocyjanian difenylometanu (MDI) oraz oligoeterol (PTMG 1000 lub Rokopol D-2002). W drugim etapie prepolimer poddawano reakcji z przedłużaczem łańcuchów, jakim był 1,4-butanodiol (BDO). Po rozdrobnieniu otrzymane materiały domieszkowano solą LiClO₄ oraz napełniano montmorylonitem przy użyciu wytłaczarki dwuślimakowej. Otrzymane materiały poddano badaniom spektroskopii FT-IR, mechanicznym oraz termomechanicznym. Przewodnictwo jonowe wyznaczono za pomocą spektroskopii impedancyjnej.

EN

Conductive polyurethane composites were prepd. by two-step method consisting in reaction of (p-NCOC₆H₄)₂CH₂ with oligoetherols and further conversion with (HOCH₂CH₂)₂, doped with LiClO₄ and filled with montmorillonite in twin screw extruder. The composites were studied for structure (FT-IR spectroscopy), mech. and thermal properties and ionic cond. The addn. of LiClO₄ resulted in increasing the cond. and deterioration of mech. properties of the composites.

19

The structure and conductivity of solid polyurethane electrolytes

63%

Leszkowski K. , Strączyński M. , Miszczyk A. , Haponiuk J. T.

Polish Journal of Applied Chemistry

|

2009

|

tom Vol. 53, nr 2

141-146

EN

The aim of the study was to determine the structure and electric properties of new solid polyurethane electrolytes. Polyurethane samples were prepared from 4,4'-diphenylmethane diisocyanate (MDI), poly(tctramethylene glycol) (PTMG) and 1,4-butanediol (BDO). Doping salts, LiCl or LiClOj were introduced into the polyurethane melt during extrusion using a laboratory twin-extruder. The obtained solid polyurethane electrolyte samples were characterized by FTIR-ATR spectroscopy and strength-strain properties. The conductivity was estimated by means of impedance spectroscopy using the direct current (DC) method and alternating current (AC) method. The conductivity was found to be related to the mode of sample preparation, namely, to doping in the liquid state at 60°C during polyurethane synthesis or mixing at 200"C in the melt.

20

Elektrolity hybrydowe organiczno-nieorganiczne dla cienkowarstwowych powłok elektrochromowych opartych na WO3.

63%

Żelazowska E. , Borczuch-Łączka M. , Rysiakiewicz-Pasek E.

Szkło i Ceramika

|

2007

|

tom R. 58, nr 4

11-17

PL

Domieszkowane solą litu (LiClO4), elektrolity hybrydowe organiczno-nieorganiczne, przydatne dla cienkowarstwowych powłok elektrochromowych opartych na WO3, zostały otrzymane metodą zol-żel z prekursorów w postaci ortokrzemianu etylu (TEOS), politlenku etylenu (PEO), tlenku propylenu (PO), węglanu propylenu (PC). Badania morfologii i ocena właściwości strukturalnych na podstawie widm FTIR wykazały, że uzyskane elektrolity były amorficzne, porowate i miały charakter materiałów hybrydowych organiczno-nieorganicznych o właściwościach strukturalnych zależnych od stosowanych dodatków organicznych. Ich stosunkowo wysoka przewodność jonowa w zakresie temperatur pokojowych (najwyższa wartość 8,29 x 10 do -3 Scm do -1), którą można wiązać ze stanem amorficznym i modyfikacją struktury żeli hybrydowych w wyniku stosowania dodatków organicznych i soli litu, czyni uzyskane materiały obiecującymi do stosowania w charakterze stałych elektrolitów dla zastosowań niskotemperaturowych w układach elektrochemicznych optoelektronicznych.

EN

Sol-gel derived, doped with lithium salt (LiClO4) organic - inorganic hybrid electrolytes for WO3 - based thin film electrochromic coatings were obtained as amorphous materials from tetraethoxysilane (TEOS), poly(ethylene oxide) (PEO), propylene oxide (PO), propylene carbonate (PC) precursors and were investigated for morphology, structural properties and ionic conductivity. All materials obtained were porous with hybrid structure, influenced by organic components and preparing procedure, evident from FTIR spectra and have proved to be efficient as electrolytes in WO3 - based electrochromic thin film systems. The relatively high room-temperature conductivity (the highest value 8.29 x 10 to the -3 Scm to the -1) can be attributed to amorphous character and structural modification due to lithium salt and organic additions and makes the obtained materials to be promising as electrolytes for ambient temperature electrochemical and optoelectronic applications.