Messanae Universitas Studiorum

From the donor acceptor concept to the system approach to interface phenomena

Gutmann, Viktor and Resch, Gerhard (1989) From the donor acceptor concept to the system approach to interface phenomena. Accademia Peloritana dei Pericolanti Classe FF.MM.NN., 67. pp. 255-273.

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    Abstract

    After a short review of the bond length variation rules of the extended donoracceptor approach, il is shown that an interface acts as a «reguiation unit» for the redistribution of electron densities while maintaining its integrai properties. Because the interface separates and connects two phases, it is necessary that each of these phases responds to and acts on the other phase in co-operation with all regions of its own phase. The phases must be subject to system organizations, which at the interface are in immediate interactions by means of the highest hierarchic levels of each phase.
    Anomalous effects are reported for the system copper electrode/copper perchlorate electrolyte, both at equilibrium conditions as well as in the course of plastic deformation of the copper eiectrode. The great influence of the electrolyte on the electrode is seen from the effects of changes in oxygen activity in the electroiyte. At pH=2 and at $C_C_u_+_+ =10^1$ the redox potential is independent of the pretreatment of the electrode and hence of the presence of oxidic superstructures. Passivity due to the presence of an oxidic superstructure is maintained only at a pH above 2, whereas at a iower pH-vaiue copper is even more readily dissolved. It is suggested that at pH=2 the system is in an optimal state of system organization, similar to those found in the course of phase tansformations in extremely thin metal films.

    Item Type: Article
    Subjects: M.U.S. - Miscellanea > Atti Accademia Peloritana > Classe di Scienze Fisiche, Matematiche e Naturali > 1989
    M.U.S. - Miscellanea > Atti Accademia Peloritana > Classe di Scienze Medico-Biologiche > 1989
    M.U.S. - Miscellanea > Atti Accademia Peloritana > Classe di Scienze Giuridiche, Economiche e Politiche > 1989
    M.U.S. - Miscellanea > Atti Accademia Peloritana > Classe di Lettere, Filosofia e belle Arti > 1989
    Divisions: UNSPECIFIED
    Depositing User: Dr M P
    Date Deposited: 05 Oct 2012 10:11
    Last Modified: 22 Jan 2013 12:32
    URI: http://cab.unime.it/mus/id/eprint/948

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