Accession Number : ADA295366

Title :   Surface Forces Microbalance and Microelectrode Measurements of Interfacial Molecular Structure and Electron-Transfer Rates.

Descriptive Note : Final rept. 1 Apr 91-31 Dec 93,

Corporate Author : UTAH UNIV SALT LAKE CITY DEPT OF CHEMISTRY

Personal Author(s) : White, Henry S.

PDF Url : ADA295366

Report Date : 21 JUN 1995

Pagination or Media Count : 6

Abstract : Fundamental Investigations of Microelectrodes. The voltammetric response of microelectrodes (dimensions between 10 and 1000 A) have been simulated using Poisson's equation coupled with the Nemst-Planck transport relationships. The results demonstrate that a significant error in the values of standard heterogeneous rates result from using conventional electroanalytical treatments that assume electroneutrality. The results were used to reanalyze data previously published by other research groups. High electronic conductivity (-1 Amp/cm2) in concentrated organic solutions was discovered and characterized by microelectrode techniques. A mechanism of this unusual conduction based on homogenous self-exchange reactions was developed. Scanning Tunneling Microscopy and Spectroscopy. Atomically smooth adlayers of halogen atoms (F, Cl, Br, and I) have been synthesized on Ag(l 11) surfaces. The adlayer structures have been determined using scanning tunneling microscopy. Resonant tunneling through individual adatoms has been observed in tunneling spectroscopy. Tip-induced surface reconstruction on Au(l 11) surfaces and dislocation motion on ordered pyrolitic graphite were discovered.

Descriptors :   *TUNNELING(ELECTRONICS), *ELECTRONIC SCANNERS, SPECTROSCOPY, SOLUTIONS(MIXTURES), INTERFACES, LAYERS, ADSORPTION, STRUCTURES, MOTION, RATES, ATOMS, ELECTRON MICROSCOPY, DISLOCATIONS, ELECTRODES, RESONANCE, HETEROGENEITY, MOLECULAR STRUCTURE, TUNNELING, ELECTRON TRANSFER, POISSON EQUATION, HALOGENS, ADATOMS.

Subject Categories : Electrical and Electronic Equipment
      Civil Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE