Frumkin isotherm

2020 ◽  
Author(s):  
O. Hinrichsen
Keyword(s):  
Frumkin Isotherm

Studies of a Mixed Adsorption Layer of Butan-1-ol and o-Toluidine on Mercury Electrode

2002 ◽  
Vol 67 (11) ◽  
pp. 1579-1588 ◽  
Author(s):  
Dorota Sieńko ◽  
Dorota Gugała ◽  
Jolanta Nieszporek ◽  
Joanna Jankowska ◽  
Jadwiga Saba
Keyword(s):  
Thermodynamic Analysis ◽  
Adsorption Layer ◽  
Supporting Electrolyte ◽  
Mercury Electrode ◽  
Interaction Constant ◽  
Repulsive Interaction ◽  
Surface Excess ◽  
Adsorption Parameters ◽  
Frumkin Isotherm ◽  
Adsorption Layers

The results of thermodynamic analysis of o-toluidine adsorption on a mercury electrode in the presence of various butan-1-ol amounts complete our previous studies on properties of mixed adsorption layers of toluidine isomers-butan-1-ol. The values of the relative surface excess Γ'°T obtained for o-toluidine show that adsorption of this compound decreases with increasing of butan-1-ol concentration. Analysis of adsorption parameters derived from the Frumkin isotherm indicates that in the presence of 0.33 M BuOH in 1 M NaClO4 with adjusted pH 3 as supporting electrolyte, ∆G0 values for o-toluidine are the highest and, at the same time, the strongest repulsive interaction occurs. In the presence of 0.11 M butan-1-ol, smaller values of ∆G0 for o-toluidine correspond to weaker repulsive interaction. Therefore the change of the Γ'°T value for o-toluidine as a function of butan-1-ol concentration is the result of mutual changes of ∆G0 and interaction constant A between adsorbate molecules.

Physical Insights from Frumkin Isotherm Applied to Electrolyte Gated Organic Transistor as Protein Biosensors

2021 ◽  
Author(s):  
Pamela Allison Manco Urbina ◽  
Marcello Berto ◽  
Pierpaolo Greco ◽  
Matteo Sensi ◽  
Simone Borghi ◽  
...  
Keyword(s):  
Organic Transistors ◽  
Label Free ◽  
Sensor Signal ◽  
Frumkin Isotherm ◽  
Organic Transistor ◽  
Dose Curve

Label free biosensors based on electrolyte gated organic transistors (EGOTs) are ultra-sensitive and versatile sensing devices. The dose curve represents the change of the sensor signal as a function of...

Adsorption at liquid interfaces: The generalized Frumkin isotherm and interfacial structure

2006 ◽  
Vol 42 (10) ◽  
pp. 1073-1078 ◽  
Author(s):  
M. I. Volkova-Gugeshashvili ◽  
A. G. Volkov ◽  
V. S. Markin
Keyword(s):  
Interfacial Structure ◽  
Liquid Interfaces ◽  
Frumkin Isotherm

Electrocapillary measurements at low concentrations of surfactants: Adsorption of tetrabutylammonium cation

1983 ◽  
Vol 48 (4) ◽  
pp. 964-975 ◽  
Author(s):  
Ladislav Novotný ◽  
Ivan Smoler ◽  
Jaroslav Kůta
Keyword(s):  
Surface Tension ◽  
Maximum Energy ◽  
Tetrabutylammonium Perchlorate ◽  
Adsorption Parameters ◽  
Surface Tension Data ◽  
Frumkin Isotherm ◽  
Low Concentrations ◽  
Drop Time

Using drop-time technique with long drop-times achieved by means of a spindle-type capillary with the combination of a interrupted convection the surface tension data of tetrabutylammonium perchlorate in 0.1 mol l-1 NaClO4 in the concentration range 3 . 10-3 mol l-1 down to 10-7 mol l-1 could be measured. The corresponding adsorption parameters have been evaluated both from Langmuir (for Θ ⪬ 0.8) and Frumkin isotherm. The maximum energy of adsorption amounts to -48.1 kJ . mol-1. The dependence of E vs log c (Yesin-Markov plot) carried out in the concentration range 10-7 to 10-3 mol l-1 showed a S-shaped curve.

Sign in / Sign up

Export Citation Format

Share Document