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Electrocapillary studies of tetrahydrofurfuryl alcohol (THFA) in aqueous specifically and non-specifically adsorbed base electrolytes were carried out. The primary results will be compared with those using a Kowalski impedance bridge method. Derived results comprising of standard electro-chemical free energies of adsorption, isotherms, surface excesses and other parameters will be presented to demonstrate unusual distinctive two-point orientation effects not hitherto reported in the literature for saturated heterocyclic compounds. Calculations of the fraction of adsorbed THFA in varying positions on the Hg surface as a function of changing bulk concentrations at constant potential will be discussed.
Colloque
Following previous studies on solid metals, electrocapillary measurements are reported for the adsorption of a series of heterocyclic and aromatic bases (and their ions) at the mercury electrode. The adsorption isotherms are derived for various electrode potentials and standard free energies ΔG⁰ of adsorption are deduced and related to molecular and electronic structure of the adsorbates. Specific π-orbital interaction effects are indicated which determine the orientation of the bases at the electrode. It is shown that dipole interaction effects lead to variations of ΔG⁰ with the 3/2 power of surface coverage θ; this prediction is confirmed experimentally. The variation of …
