Polarography of pyridine-2-carbaldehyde 2-pyridylhydrazone in solutions of varying pH at a dropping-mercury electrode: effect of surface-active substance

1985 ◽  
pp. 499 ◽  
Author(s):  
Ali Z. Abu Zuhri ◽  
Jamal S. Shalabi
Keyword(s):  
Active Substance ◽  
Mercury Electrode ◽  
Surface Active Substance ◽  
Electrode Effect ◽  
Dropping Mercury Electrode ◽  
Surface Active ◽  
Effect Of Surface

Direct current polarography of the ferrous-ferric oxolate system in the presence of alternating voltages

1958 ◽  
Vol 11 (1) ◽  
pp. 9
Author(s):  
P Beckmann ◽  
GS Buchanan
Keyword(s):  
Direct Current ◽  
Active Substance ◽  
Mercury Electrode ◽  
Surface Active Substance ◽  
Active Materials ◽  
Wave Potential ◽  
Half Wave ◽  
Dropping Mercury Electrode ◽  
Surface Active ◽  
Alternating Voltage

The effect of the superposition of a small alternating voltage on the normal direct voltage applied to the dropping mercury electrode (D.M.E.) was investigated in the case of the ferrous-ferric oxalate system. The wave obtained was of the type found previously for ions which are reversibly reduced at the D.M.E. (e.g. Cd++ etc.). That is, the rectification of the A.C. produced a D.C. wave (the Z wave) which crossed the normal D.C. wave (the Y wave) at the half-wave potential (E�), When surface active materials were added (e.g. cyclohexanol) the reduction became " irreversible " and at certain concentrations of the surface active substance a maximum appeared on the Y wave of a somewhat unusual nature. The effect of a superposed alternating voltage was studied in these cases and it was found that the adsorption of the cyclohexanol was influenced by the presence of the alternating voltage.

Effect of surface active cations undergoing interfacial rearrangements on deposition type electrode reactions

1988 ◽  
Vol 53 (4) ◽  
pp. 732-742 ◽  
Author(s):  
Anastos Anastopoulos ◽  
Anastasia Christodoulou
Keyword(s):  
Rate Constants ◽  
Mercury Electrode ◽  
Size Ratio ◽  
Inhibition Mechanism ◽  
Electrode Reactions ◽  
Dropping Mercury Electrode ◽  
Surface Active ◽  
Activated Complex ◽  
Effect Of Surface

The influence of the adsorption of methyltriphenyl- and cyclopropyltriphenylphosphonium cations on simple deposition reactions of Cd2+ and Zn2+ at the dropping mercury electrode, is studied by polarographic techniques. The size parameters of the activated complex, r≠, and adsorbate particles, ri, are determined and discussed. It is shown that for substances undergoing interfacial rearrangements, i.e. condensation and reorientation, the values of the size ratio r≠/ri can hardly be correlated to independently determined values of r≠ and ri. Electrode coverages are related to formal rate constants and an elucidation of the inhibition mechanism is attempted.

scholarly journals INFLUENCE OF SPEED, TIME OF HOMOGENIZATION, TYPE OF SURFACE ACTIVE SUBSTANCE ON THE SIZE OF PENTOXYPHILLINE NANOPARTICLES BASED ON POLY-DL-LAKTIDE-CO-GLICOLIDE

2017 ◽  
Vol 5 (2) ◽  
pp. 177-194 ◽  
Author(s):  
T. V. Timchenko ◽  
A. V. Blinov ◽  
A. V. Serov ◽  
L. I. Shcherbakova ◽  
V. A. Kompantsev ◽  
...  
Keyword(s):  
Active Substance ◽  
Surface Active Substance ◽  
Surface Active
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