Local pH changes triggered by photoelectrochemistry for silica condensation at the liquid-liquid interface - Université de Lorraine Accéder directement au contenu
Article Dans Une Revue Electrochimica Acta Année : 2016

Local pH changes triggered by photoelectrochemistry for silica condensation at the liquid-liquid interface

Résumé

We present here a new photoelectrochemical method for varying the pH locally to trigger silica condensation at the interface between two immiscible electrolyte solutions CITIES). Trimethylbenzhydrylammonium cation is a photoactive compound dissolved in the organic phase. Electrochemical studies have shown a reversible transfer across the interface controlled by diffusion. Its transfer from the organic to the aqueous phase and its concomitant photo-irradiation has led to the decrease of pH, which was locally monitored by Pt microelectrode covered with iridium oxide and positioned at a distance of 1 pm from the ITIES by shearforce detection. Such local measurements of the pH were necessary as side reactions at the aqueous counter electrode were changing the bulk pH. The pH at the interface dropped from 6 to lower than 2 when photoelectrolysis was applied for 50 min. This local pH variation was then harnessed to the acidic condensation of mesoporous silica at the ITIES.
Fichier principal
Vignette du fichier
50-postprint.pdf (855.11 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-01504769 , version 1 (09-11-2018)

Identifiants

Citer

Lukasz Poltorak, Marc Hébrant, Mohana Afsharian, Mathieu Etienne, Grégoire Herzog, et al.. Local pH changes triggered by photoelectrochemistry for silica condensation at the liquid-liquid interface. Electrochimica Acta, 2016, 188, pp.71-77. ⟨10.1016/j.electacta.2015.11.107⟩. ⟨hal-01504769⟩
69 Consultations
200 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More