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  • 1
    Electronic Resource
    Electronic Resource
    Isotope-selective infrared multiphoton dissociation of CF3Br in a supersonic free jet (1986)
    Springer
    Applied physics 41 (1986), S. 91-94 
    Details
    ISSN: 1432-0649
    Keywords: 33.80.Wz ; 33.80.Gj ; 82.40.Dm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The carbon-isotope selectivity in the multiphoton dissociation of CF3Br is studied in the collisional region of supersonic free jet. The isotopic abundance of12C and13C in C2F6 formed by recombination of the dissociation products is measured with a quadrupole mass spectrometer. An enrichmet factor of 9.4 is obtained for12C with the 9R(30)CO2 laser line while the factor of 6.9 is obtained for13C with the 9P(16) line.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00702659
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation of polyimides from 2,3-bis(4-aminophenyl)quinoxalines and aromatic tetracarboxylic dianhydrides (1990)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 11 (1990), S. 673-677 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1990.030111214
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  • 3
    Electronic Resource
    Electronic Resource
    Coagulation of polymer-Cu2+ complexes in polymer films and its application for producing semiconducting CuI surface layers (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 23 (1979), S. 2279-2291 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: In poly(vinyl alcohol) and polyacrylamide films containing the corresponding polymer-Cu2+ complexes, the reason why the films may gain surface electrical semiconductivity as high as 10-3 Ω-1 when treated with acetone solution of iodine was investigated. Optical and scanning electron microscope observations indicated that the coagulated polymer-Cu2+ complexes favor the appearance of the high conductivity and that the state of coagulation depends on the anions of the copper salts used as well as two parameters, F1 ≡ [Cu2+]/[MU] and F2 ≡ [OH-]/[Cu2+], where [MU] is the molar concentration of monomeric units of the polymer and [OH-] is that of hydroxide ions added. The effectiveness of the anions in causing coagulation decreases in the order of SO42- 〉 Cl- 〉 NO3- ≈ Br-. The whitish substance that appears on the film surface after the iodine treatment gives x-ray Debye-Scherrer rings characteristic of γ-CuI. The γ-CuI surface layer adheres to the film rather firmly, at least in polyacrylamide, and is responsible for the conductivity. By controlling the state of coagulation of the complexes and hence the formation of the γ-CuI surface layer, we have produced films with anisotropic surface electrical semiconductivity, i.e., σ∥ ≈ 10-4 Ω-1 and σ∥/σ⊥ = 1 ˜ 103. Optical and ESR spectra are also obtained to understand the mechanism of γ-CuI formation and to clarify the optical properties of the films.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1979.070230807
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  • 4
    Electronic Resource
    Electronic Resource
    Photoconductivity of poly(vinyl alcohol) films with Fe3+ complexes and ESR study of their structures (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 26 (1981), S. 1659-1674 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: We have studied whether photoconductivity is observed in polymer films containing the first transition metal complexes. Polymers investigated were poly(vinyl alcohol) (PVA), polyacrylamide, poly(acrylic acid), poly(vinyl pyrrolidone), and polyethylene glycol. Transition metal salts used were CrCl3, MnCl2, FeCl3, CoCl2, NiCl2, FeBr3, Fe(NO3)3, Fe2(SO4)3, and Fe(ClO4)3. Only in the PVA-FeCl3 film was relatively large photoconductivity due to the photoreduction of Fe3+ observed. ESR spectra indicate that an Fe3+ ion is chelated with two in-plane OH residues of PVA and coordinated with three Cl-ions on the meridian. UV irradiation causes an electron transfer from Cl- to Fe3+. The produced chlorine atom extracts an electron from the oxygen of a neighboring OH residue. The unpaired electron thus formed can move from one oxygen to another through hydrogen bonding. In other words, the photoconductivity is due to holes produced in the network of PVA hydrogen bonding by the reduction of Fe3+. Finally, we have tried to explain why the photoconductivity is observed only in the PVA-FeCl3 film.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1981.070260521
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  • 5
    Electronic Resource
    Electronic Resource
    Novel method of preparing Ag-Hg alloy on polyacrylamide films and their structure (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 795-802 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A novel method is proposed of preparing thin Ag-Hg alloy on PAAm film surface at room temperature: The film of interest is formed by holding PAAm aqueous solution with AgNO3 in Hg-saturated atmosphere. Two kinds of films, one of which is a conductor and the other an insulator, can be selectively formed with pH-controlled PAAm solution by ammonia. The conducting surface is assigned to the α phase of Ag-Hg alloy by means of X-ray analysis. Potentiometric titration and IR spectral studies suggest the existence of PAAm-Ag+ complexes. On the basis of their structure and the oxidation and reduction potential of Ag+ and Hg2+, the mechanism of film formation is also discussed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1984.070290307
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  • 6
    Electronic Resource
    Electronic Resource
    X-ray analysis of α-, β-, and γ-phase Ag-Hg alloy films produced on polymer substrates by casting polyacrylamide-AgNO3 aqueous solution in Hg atmosphere (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 3813-3823 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: It is reported that, by dropping Hg metal on the wet α-phase Ag-Hg alloy film formed on the cast polyacrylamide-AgNO3 aqueous solution, the α phase of fcc structure can be converted into other phases that contain more Hg. The X-ray analysis of these phases reveals that they are the β phase of hexagonal structure and the γ phase of bcc structure. It is also shown that the lattice constant of the α phase can be controlled to some extent by pH of the aqueous solution of PAAm from which the alloy film is formed.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1984.070291215
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  • 7
    Electronic Resource
    Electronic Resource
    Factors controlling electroosmotic flow in open-tubular capillaries in electrokinetic chromatography (1986)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 9 (1986), S. 666-670 
    Details
    ISSN: 0935-6304
    Keywords: Electrokinetic chromatography ; Electroosmosis ; Electrophoresis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Effects of pH, concentration of sodium dodecyl sulfate (SDS), additives, and coatings of polymers on the inner wall of fused silica tubing on electrokinetic migration were investigated with SDS solutions. The increase in SDS concentrations caused a substantial increase of the electrophoretic velocity of the SDS micelle but little affected the electroosmotic velocity veo under a constant applied voltage. No significant change in veo was observed either when the pH of the solution was varied from 5.5 to 9 or when additives such as hydroxypropyl cellulose were employed. Compared with an uncoated tube, electroosmosis became stronger in a fused silica tube coated with methyl silicone but weaker in one coated with polyethylene glycol 20M.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240091115
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  • 8
    Electronic Resource
    Electronic Resource
    Raman circular polarization difference spectra (I+ - I-) excited by circularly polarized laser radiation in atactic polystyrene (1979)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 17 (1979), S. 415-419 
    Details
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1979.130170704
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