scholarly journals Determination of the tunneling barrier by transport and spectroscopy: Self-consistency for the case of alkyl thiols and dithiols on Ag, Au, and Pt electrodes

2020 ◽  
Author(s):  
Zuoti Xie ◽  
C. Daniel Frisbie ◽  
Ioan Baldea
Keyword(s):  
Tunneling Barrier ◽  
Pt Electrodes ◽  
Self Consistency

Lab-on-a-Chip Device for Hydrogen Sulfide Sensing in Biomedical and Environmental Applications Using Electrochemical Approach

2015 ◽  
Author(s):  
A. Baniya ◽  
S. Thapa ◽  
E. Borquist ◽  
D. Bailey ◽  
D. Wood ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Direct Detection ◽  
Sulfide Oxidation ◽  
Lab On A Chip ◽  
Electrode System ◽  
Sulfide Concentration ◽  
Pt Electrodes ◽  
Electrochemical Approach ◽  
And Performance

Hydrogen sulfide (H2S) is rapidly emerging as a biologically significant signaling molecule. In recent studies, sulfide level in blood or plasma has been reported to be in the concentration between 10 and 300 μM suggesting it acts in various diseases. This work reports progress on a new Lab-on-a-Chip (LOC) device for these applications. The uniquely designed, hand-held device uses advanced liberation chemistry that releases H2S from liquid sample and an electrochemical approach to detect sulfide concentration from the aqueous solution. The device itself consists of three distinct layers of Polydimethylsiloxane (PDMS) structures and a three electrode system for direct and rapid H2S concentration measurement. In this work specifically, the oxidation of sulfide at the gold (Au) and platinum (Pt.) electrodes has been examined. This is the first known application of electrochemical H2S sensing in an LOC application. The analytical utility and performance of the device has been assessed through direct detection using chronoamperometry (CA) scan and cyclic voltammetry (CV). An electrocatalytic sulfide oxidation signal has been recorded for sulfide concentration range vs, Ag/AgCl at different pH buffers at the trapping chamber. The calibration curve in the range 1 μM to 1 M was obtained using this electrode setup. The detection limit was found to be 0.1 μM. This device shows promise for providing fast and inexpensive determination of H2S concentration in aqueous samples.

Active Area Determination of Porous Pt Electrodes Used in Polymer Electrolyte Fuel Cells: Temperature and Humidity Effects

2010 ◽  
Vol 157 (12) ◽  
pp. B1795 ◽  
Author(s):  
Rakel Wreland Lindström ◽  
Katrin Kortsdottir ◽  
Maria Wesselmark ◽  
Alejandro Oyarce ◽  
Carina Lagergren ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Polymer Electrolyte ◽  
Polymer Electrolyte Fuel Cells ◽  
Active Area ◽  
Humidity Effects ◽  
Pt Electrodes ◽  
Temperature And Humidity ◽  
Area Determination

Microscopic description of ground state magnetic moment and low-lying magnetic dipole excitations in heavy odd-mass 181Ta nucleus

2016 ◽  
Vol 25 (08) ◽  
pp. 1650053 ◽  
Author(s):  
Emre Tabar ◽  
Hakan Yakut ◽  
Ali Akbar Kuliev
Keyword(s):  
Excited States ◽  
Magnetic Dipole ◽  
Ground State ◽  
Magnetic Moments ◽  
Nuclear Model ◽  
Spurious State ◽  
Restoration Method ◽  
State Mixing ◽  
Self Consistency

The ground state magnetic moments and the low-lying magnetic dipole (Ml) transitions from the ground to excited states in heavy deformed odd-mass [Formula: see text]Ta have been microscopically investigated on the basis of the quasiparticle-phonon nuclear model (QPNM). The problem of the spurious state mixing in M1 excitations is overcome by a restoration method allowing a self-consistent determination of the separable effective restoration forces. Due to the self-consistency of the method, these effective forces contain no arbitrary parameters. The results of calculations are compared with the available experimental data, the agreement being reasonably satisfactory.

ON THE THEORY OF THE X-RAY DETERMINATION OF ELASTIC SCATTERING OF CATHODE RAYS

1934 ◽  
Vol 11 (2) ◽  
pp. 156-162
Author(s):  
Darol K. Froman
Keyword(s):  
Wave Length ◽  
Absolute Measurement ◽  
Theoretical Work ◽  
The Self ◽  
Solid Target ◽  
X Rays ◽  
Scattering Function ◽  
X Ray ◽  
Self Consistency

This paper is a continuation of Bubb's (1) theoretical work which relates the energies and momenta of cathode rays to the properties of X-ray photons produced by them. Bubb's results are used to determine a scattering function for the cathode rays in a target in terms of the intensities of X-rays of minimum wave-length emergent from the target at various angles to the incident cathode-ray stream. It is shown that the self-consistency of Bubb's results can be tested by measurements of the intensities of two components of these X-rays polarized in mutually perpendicular planes. Mention is made of an experiment now in progress designed to test Bubb's theory by an absolute measurement using a gaseous instead of a solid target.

Determination of the Real Surface Area of Pt Electrodes by Hydrogen Adsorption Using Cyclic Voltammetry

2000 ◽  
Vol 77 (9) ◽  
pp. 1195 ◽  
Author(s):  
José M. Doña Rodríguez ◽  
José Alberto Herrera Melián ◽  
Jesús Pérez Peña
Keyword(s):  
Cyclic Voltammetry ◽  
Surface Area ◽  
Hydrogen Adsorption ◽  
Real Surface ◽  
The Real ◽  
Pt Electrodes ◽  
Real Surface Area
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