55 research outputs found
Scanning Electrochemical Microscopy. Theory of the Feedback Mode
The steady-state current that flows between the scanning tlp (a disk ultramicroelectrode imbedded in an Insulating sheath) and a planar sample substrate in a scannlng electrochemical microscope (SECM) operating in the feedback mode is calculated by the finite element method with an exponentlaily expandlng grld, for both conductlve and Insulating samples. For conductlve substrates the tip current, representing, for example, the oxidatkn reactlon of R to 0, is enhanced by flow of R generated at the substrate to the tlp and is a functlon of tiphubstrate distance, d , but not the radius of the lnsuiatlng sheath. For insulating substrates, the tlp current Is decreased by blockage of the diffusion of R to the tip by the substrate and depends upon d and the Insulating sheath radius. The theoretical results are compared to experimental studies
Correlation of elution in different liquid chromatographic systems without analyte identification
Standardization of Second-Order Chromatographic/Spectroscopic Data for Optimum Chemical Analysis
Quantification of Compound Classes in Complex Mixtures and Fuels Using HPLC with Differential Refractive Index Detection
Enhanced Chemical Analysis Using Parallel Column Gas Chromatography with Single-Detector Time-of-Flight Mass Spectrometry and Chemometric Analysis
Comparison of an integration procedure to Fourier transform and data averaging procedures in chromatographic data analysis
Indirect differential thermal lens detection for the reversed-phase separation of underivatized fatty acids
Steady-state and lifetime-resolved fluorescence-detected circular dichroism using a modified phase-modulation spectrofluorometer
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