Interfacial acidities, charge densities, potentials, and energies of carboxylic acid-functionalized silica/water interfaces determined by second harmonic generation.
Second-harmonic studies were carried out to determine the interfacial acidity, the potential, and the interfacial energy density of an acid-functionalized silica/water interface between pH 2 and 12. The interfacial potential changes over 3 orders of magnitude, from 10-2 mV to several tens of millivolts, and the interfacial energy density changes by 7 orders of magnitude, from less than 10-7 mJ/m2 to several millijoules per square meter. The methodology presented in this study provides quantitative thermodynamic information necessary for understanding and predicting how solvated species interact with functionalized organic adlayers at liquid/solid interfaces over a wide pH range.
Konek
Christopher T
CT
Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA.
Musorrafiti
Michael J
MJ
Al-Abadleh
Hind A
HA
Bertin
Paul A
PA
Nguyen
SonBinh T
ST
Geiger
Franz M
FM
D002264:Carboxylic Acids / Q000737:chemistry*; D004563:Electrochemistry; D006860:Hydrogen Bonding; D006863:Hydrogen-Ion Concentration; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties; D013816:Thermodynamics; D014867:Water / Q000737:chemistry*
D002264:Carboxylic Acids; D014867:Water; D012822:Silicon Dioxide