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  • 1
    Electronic Resource
    Electronic Resource
    Ionic pairing in binary liquids of charged hard spheres with nonadditive diameters (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 1827-1832 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We examine types of short range order that arise in binary liquids from a combination of Coulombic interactions and nonadditivity of excluded volumes, the initial motivation being observations of complex formation by hydrated ions in concentrated aqueous solutions. The model is a fluid of charged hard spheres with contact distances σ+−≠ 1/2 (σ+++σ−−), its structural functions being evaluated in the mean spherical approximation and in the hypernetted chain approximation. Cation–anion pairing is clearly seen in the calculated structural functions for negative deviations from additivity (σ+−〈σ++=σ−−), though the absence of true chemical bonding in the model does not allow long-lived complexes. Positive deviations from additivity (σ+−〉σ++=σ−−) favor long-wavelength concentration fluctuations and demixing in a neutral mixture: these are suppressed by Coulombic interactions in favor of microscopic intermixing of the two species in the local liquid structure, up to like-ion pairing. Comparison is made with diffraction from concentrated aqueous solutions of cadmium sulphate and other instances of possible applicability of the model are pointed out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450429
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Dependence ofT c on doping in oxygen-hole induced Jahn-Teller mediated superconductors (1993)
    Springer
    The European physical journal 91 (1993), S. 285-290 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A bipolaronic model of high-T c superconductivity, that is based upon the idea that a doped oxygenhole reduces the separation between the $$d_{x^2 - y^2 }$$ and $$d_{3z^2 - r^2 }$$ levels of the neighbouring Cu-ion and hence causes a Jahn-Teller mixing between the two levels, is suggested. Within the BCS scheme, the bipolaron Hamiltonian is investigated for the superconducting order parameter Δ and the critical temperatureT c as a function of hole-doping. Under suitable approximation for the bipolaronic kinetic energy, the hole-doping dependence ofT c shows a universal behaviour. For temperatures close toT c and forT c ≫1, Δ obeys the BCS type of relation with pre-factor of (1−T/T c )2 related to the range of superconducting-phase against the doping axis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01344057
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Quantitative separations of Fe2+ from Ni2+ and Co2+ and of Hg2+ from Cu2+, Zn2+, Pb2+, Ag+ and Bi3+ by thin layer chromatography (1978)
    Springer
    Chromatographia 11 (1978), S. 389-392 
    Details
    ISSN: 1612-1112
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The quantitative separations of Fe2+ from Ni2+ and Co2+ and of Hg2+ from Cu2+, Zn2+, Pb2+, Ag+ and Bi3+ have been studied in detail using varying concentrations of NaCl solution in acetone. In order to find the optimum conditions for the separation of these ions, a systematic study was made of various important factors, such as sample concentration, eluent concentration, pH and ionic strength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02312650
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Spectrophotometric determination of copper, nickel and cobalt after extraction with benzoyltrifluoroacetone (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 271 (1974), S. 286-286 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Kupfer, Nickel, Kobalt mit Benzoyltrifluoraceton ; Spektralphotometrie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00432835
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    Paper (German National Licenses)
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