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  • 1
    Electronic Resource
    Electronic Resource
    Controlled modification of poly(hydroxybutyrate) surfaces by a perfluorohexane plasma: ESCA and contact angle studies (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 31 (1993), S. 1779-1788 
    Details
    ISSN: 0887-624X
    Keywords: ESCA ; contact angle ; surface characterization ; poly(hydroxybutyrate) ; plasma treatment ; perfluorohexane ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Poly(hydroxybutyrate) films and inorganic glass slides were treated by cold plasma. The composition of the gas mixture of perfluorohexane and hydrogen was varied to obtain controlled surface coatings of different hydrophobicities. The analysis by weight variation, scanning electron microscopy (SEM), electron spectroscopy for chemical analysis (ESCA), and contact angle measurements were used to evaluate the influence of the flow rate, composition, and the plasma power on the surface structure after the plasma deposition. High-resolution ESCA spectra were used to determine quantitatively the amount of different fluorine-containing species present in the plasma-deposited layers. Molecular structures and surface energies of deposited layers on polymer substrates were compared with those on inorganic substrates. In both cases a strong correlation was found between the surface free energy and the fluorine/carbon ratio as well as the oxygen/carbon ratio. Furthermore, samples with high carbon/fluorine ratios showed a high content of CF2 and CF3 groups. © 1993 John Wiley & Sons, Inc.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1993.080310717
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  • 2
    Electronic Resource
    Electronic Resource
    The determination of electron transfer parameters for monosubstituted ferrocenes suitable as mediators in amperometric biosensors (1991)
    Weinheim : Wiley-Blackwell
    Electroanalysis 3 (1991), S. 917-923 
    Details
    ISSN: 1040-0397
    Keywords: Biosensor ; electron transfer ; mediator ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The quasi-reversible electron transfer of monosubstituted ferrocenes at a gold electrode in acetonitrile, water, and an aqueous surfactant solution is characterized by formal potentials, diffusion coefficients, heterogeneous electron transfer rate constants, and transfer coefficients. These system parameters are calculated from peak potentials, peak currents, and peak potential differences by means of the multiparameter estimation technique. The results are compared with those of a combined evaluation of rotating disk electrode (rde) and cyclic voltammetric data. The former method can be used even if the rde results are distorted by filming of the electrode. The size of the molecules and, in the case of surfactant addition, the size of micelles containing the ferrocenes is estimated from diffusion coefficients. The electrochemical properties are discussed in view of future applications of these compounds as mediators in amperometric biosensors.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140030907
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    Paper (German National Licenses)
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