Ac-electrogravimetry study of ionic exchanges on a polypyrrole modified electrode in various electrolytes

Correlation between ion-exchange properties and swelling/shrinking processes in hexasulfonated calix[6]arene doped polypyrrole films: ac-electrogravimetry and electrochemical atomic force microscopy investigations

“…The experimental procedure and setup used to carry out the ac-electrogravimetry experiments have been reported elsewhere in previous publications of our group [42][43][44][45]. The quartz crystals used in the present investigations have a base frequency of 9 MHz.…”

“…(12) : 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 Simultaneous measurements of the electrochemical impedance E ( ) I and of the electrogravimetric transfer function m ( ) E were performed by using a technique already described elsewhere [42][43][44][45]. Figure 3 Figure 6 shows that it is mainly the cations which are involved in the charge compensation: a large quantity of cations are expelled when the potential increases.…”

Polymer dynamics in thin p-type conducting films investigated by ac-electrogravimetry. Kinetics aspects on anion exclusion, free solvent transfer, and conformational changes in poly(o-toluidine)

“…This technique was clearly proven to be helpful in polymer studies as an easy and fast identification methodology for cation and anion transfers involved in the charge compensation process together with a noticeable kinetic information when electrochemical and mass impedance spectroscopy are discussed together [22][23][24][25][26]. To separate among anion, cation and solvent contributions from the global electrogravimetric response, it is necessary to find experimental conditions where the time constants of these three transfers are fairly different [27].…”

“…Gabrielli et al have extensively described that for very thin polymer films [22,27,[42][43][44][45], the change of the concentration of the anions, A -, when a small sine wave potential perturbation, , is applied as a function of perturbation frequency is:…”

Étude de films bleu de Prusse/Nafion® 117 par microbalance à quartz en régime dynamique

“…Dans nos précédents travaux, la technique d'électrogravimétrie a été mise au point pour étudier des films électroactifs, comme le polypyrrole [2,3] ou le bleu de Prusse [4][5][6]. En mesurant simultanément l'impédance électrochimique (concernant l'aspect charge électrique) et la fonction de transfert électrogravimétrique (concernant l'aspect variation de masse), le rôle de chaque ion participant à la compensation de charge, à chaque potentiel imposé, a été établi lorsque le film est électroactif.…”