Interfacial processes studied by coupling electrochemistry at the polarised liquid-liquid interface with in situ confocal Raman spectroscopy.
Interfacial processes controlled by ion transfer voltammetry at the interface between two immiscible electrolyte solutions were studied by in situ Raman spectroscopy. Raman spectra of the interface between a 5 mM NaCl aqueous solution and 10 mM bis(triphenyl-phosphoranydieneammonium) tetrakis(4-chlorophenyl)borate in 1,2-dichloroethane were recorded at open circuit potential and at various interfacial potential differences. At open-circuit potential, Raman peaks assigned to vibrational modes of 1,2-dichloroethane are clearly visible and peaks of weak intensity are measured for the organic electrolyte ions. When a negative interfacial potential difference is applied, the intensity of the peaks of the cation of the organic electrolyte increases, confirming its transfer induced by the interfacial potential difference applied. The electrochemically assisted generation of mesoporous silica deposits was then followed by in situ confocal Raman spectroscopy. The condensation of mesoporous silica was controlled by the transfer of cetyltrimethylammonium (CTA(+)) ions to an aqueous phase containing hydrolysed silanes. The transfer of CTA(+) at the interface was monitored in situ by confocal Raman spectroscopy, and formation of silica was observed.
Laboratoire de Chimie Physique et Microbiologie pour l'Environnement (LCPME), UMR 7564, CNRS - Université de Lorraine, 405 rue de Vandœuvre, 54600 Villers-lès-Nancy, France. gregoire.herzog@univ-lorraine.fr.
Lukasz
L
Poltorak
Manuel
M
Dossot
Grégoire
G
Herzog
Alain
A
Walcarius
D000327:Adsorption; D064751:Ammonium Compounds / Q000737:chemistry; D002593:Cetrimonium Compounds / Q000737:chemistry; D055664:Electrochemical Techniques / Q000295:instrumentation*; D004573:Electrolytes / Q000737:chemistry*; D004867:Equipment Design; D005025:Ethylene Dichlorides / Q000737:chemistry; D007477:Ions / Q000737:chemistry; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D012965:Sodium Chloride / Q000737:chemistry; D013059:Spectrum Analysis, Raman / Q000295:instrumentation*; D013499:Surface Properties; D013775:Tetraphenylborate / Q000031:analogs & derivatives / Q000737:chemistry
D064751:Ammonium Compounds; D002593:Cetrimonium Compounds; D004573:Electrolytes; D005025:Ethylene Dichlorides; D007477:Ions; C030385:tetrakis(4-chlorophenyl)borate; D013775:Tetraphenylborate; D012965:Sodium Chloride; C024565:ethylene dichloride; D012822:Silicon Dioxide