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  • 1
    Electronic Resource
    Electronic Resource
    EXAFS and thermal studies on zinc polymeric electrolytes (1989)
    Springer
    Applied physics 49 (1989), S. 249-257 
    Details
    ISSN: 1432-0630
    Keywords: 61.40 ; 61.10 ; 66.30 ; 64.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract (PEO) n :ZnX 2 (X = I, Br) complexes were formed at room temperature with values ofn ranging from 8 to 30. Differential scanning calorimetry (DSC) results indicate that none of them contained any crystalline phases that can be associated with the formation of a complex (i.e. it can be assumed that all the salt is in the amorphous phase). EXAFS studies carried out on these samples suggest that the zinc cation is co-ordinated to two of the halide ions and, in addition, to 4 oxygen atoms whereX = I and 6 oxygen atoms whereX = Br. The DSC results confirm that the zinc cation is in an environment independent of overall stoichiometry, as the glass transition temperatures of the samples were found to be similar throughout. By comparing these with those of annealed samples (made by heating the above samples to 150°C and cooling to −80°C at 320°C min−1) it was found that the stoichiometry of the amorphous phase was roughly 6∶1 forX=I and 8∶1 forX = Br.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616851
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  • 2
    Electronic Resource
    Electronic Resource
    Electrochemical synthesis using reactant-incorporated graphite powder electrodes: The reduction of p-dinitrobenzene in dilute aqueous acid (1986)
    Springer
    Journal of applied electrochemistry 16 (1986), S. 213-222 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract An approach to electro-organic synthesis has been developed using a composite or multiphase electrode where the solid, insoluble reactant is incorporated into a compacted powder electrode system. This has been achieved by intimately mixing the finely dispersed organic solid into a paste with graphite powder and an aqueous electrolyte. The paste was then spread between a graphite felt sandwich. A cell capable of utilizing 500 mg of organic material and achieving current densities of 3 A dm−2 (6 A g−1 of organic material) has been developed, and in such a systemp-dinitrobenzene has been reduced top-nitrophenylhydroxylamine in 1 M H2SO4 (28% yield). Reduction at a potential 100 mV more cathodic than that required for the production ofp-nitrophenylhydroxylamine, followed by reoxidation at +180 mV, gavep-benzoquinone with 34% yield. The electrode performance has been found to depend on its overall thickness, the size of the particles and the graphite content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01093353
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  • 3
    Electronic Resource
    Electronic Resource
    Cathodic polarization of pure iron in concentrated alkaline solution (1973)
    Springer
    Journal of applied electrochemistry 3 (1973), S. 61-64 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The potentiostatic pulse method was used to study the electrochemical evolution of hydrogen on polycrystalline iron electrodes in concentrated KOH solutions. It was found that in pure KOH solutions there appeared to be two reaction mechanisms for hydrogen evolution, one at high the other at low overpotentials. The addition of Li+, at constant hydroxide ion concentration, altered the kinetic parameters of these two mechanisms. Furthermore in pure LiOH only one reaction mechanism for all overpotentials was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01119468
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  • 4
    Electronic Resource
    Electronic Resource
    Stiffness as a function of moisture content in natural materials:Characterisation of hoof horn samples (1998)
    Springer
    Journal of materials science 33 (1998), S. 5185-5191 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Hoof horn, which forms the capsule at the lower part of the legs of many grazing animals including equids (horses, donkeys and mules), is a composite natural material based on α-keratin. Its function is influenced by the tubular and intertubular material and is modulated by the moisture content. There is a requirement to adopt a standard approach to drying regimes and sampling protocols in order to make progress in understanding how the biomechanical properties of hoof horn are related to its structure. In this work the stiffness of donkey hoof has been examined using a three point bending technique and the effect of hydration has been investigated. Also the tubule density properties of this hoof horn material are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004479803611
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  • 5
    Electronic Resource
    Electronic Resource
    Polymer electrolyte based solid state redox supercapacitors with poly (3-methyl thiophene) and polypyrrole conducting polymer electrodes (1997)
    Springer
    Ionics 3 (1997), S. 177-183 
    Details
    ISSN: 1862-0760
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Types I and II solid state redox supercapacitors have been constructed using polypyrrole (pPy) and poly (3-methyl thiophene) (pMeT) conducting polymer electrodes with lithium ion conducting polymer electrolyte poly(ethylene oxide) (PEO)-LiCF3SO3 plasticised with poly (ethylene glycol) (PEG). The performance of the capacitors has been characterised by a.c. impedance, linear sweep voltammetry, galvanostatic charge-discharge methods and long term cycling tests. The asymmetric type II capacitors with p-doped pPy and pMeT electrodes give a capacitance value ∼ 2 mF cm−2 (equivalent to 18 Fg−1 of the total mass of the electrodes) and can be charged up to the voltage of 1.7 V. The symmetric type 1 capacitors of the configuration pPy | polymer electrolyte | pPy and pMeT | polymer electrolyte | pMeT show comparable values of capacitance but they are limited to the working voltage of 〈1.0 V.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02375614
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  • 6
    Electronic Resource
    Electronic Resource
    Study of a zinc chloride in poly(ethylene glycol) layer on an aluminium oxide surface by inelastic electron tunneling spectroscopy (1995)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 23 (1995), S. 565-569 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Inelastic electron tunneling spectroscopy is used to compare the adsorption onto aluminium oxide of poly(ethylene glycol) of relative molar mass 400 (PEG400) with poly(ethylene glycol) that has been coordinated with zinc chloride. This work carried out on a low-molecular-weight analogue of a polymer electrolyte reveals that the steric hinderance brought about by the coordination of zinc chloride with poly(ethylene glycol) changes the mechanism by which the polymer bonds to an aluminium oxide surface. The zinc bonds both to atmospheric water and to the ether oxygens in the polymer, which restricts the conformational freedom of the polymer. This restriction causes the attachment of the polymer to the aluminium oxide substrate to be primarily by hydrogen bonding, which reveals itself through the appearance of an extra peak in the inelastic electron tunneling spectrum at ∼440 meV. The implication is that when monolayer coatings of PEG400/ZnCl2 are adsorbed on aluminium oxide, the coordination of the zinc with the polymer imposes a structure upon the latter.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740230717
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  • 7
    Electronic Resource
    Electronic Resource
    Supercapacitor devices using porous silicon electrodes (1999)
    Springer
    Ionics 5 (1999), S. 144-149 
    Details
    ISSN: 1862-0760
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Electrical double layer (EDL) supercapacitors have been constructed using gold coated porous silicon (PSi) electrodes in a 0.25 M TEABF4/PC solution. As a comparison with the PSi, graphite paper, carbon cloth and ITO on glass electrodes have also been tested using the same electrolyte. The capacitors have been characterised using a.c. impedance spectroscopy and cyclic voltammetry (normal staircase mode). Devices using PSi electrodes showed a capacitance of approximately 0.2 mF cm−2 (equivalent to 5 mF g−1). In comparison, devices based on ITO on glass electrodes had a capacitance of 0.76 mF cm−2. Those based on graphite-paper electrodes gave 10 mF cm−2 (equivalent to 131 mF g−1) and those using carbon cloth gave 600 mF cm−2 (equivalent to 35 F g−1).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02375918
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  • 8
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    EXAFS and thermal studies on zinc polymeric electrolytes (1989)
    Springer
    Details
    Publication Date: 1989-09-01
    Print ISSN: 0947-8396
    Electronic ISSN: 1432-0630
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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