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Titolo:
STUDIES ON PERMSELECTIVITY AT THE PHASE-BOUNDARY OF ION-SELECTIVE LIQUID MEMBRANES BY OPTICAL PHENOMENA AS PROBES FOR PHASE-BOUNDARY POTENTIALS
Autore:
YOSHIYAGAWA S;
Indirizzi:
HOKKAIDO PREFECTURAL POLICE HEADQUARTERS,FORENS SCI LAB,CRIMINAL INVESTIGAT DEPT,CHUO KU SAPPORO HOKKAIDO 060852 JAPAN
Titolo Testata:
Bunseki Kagaku
fascicolo: 8, volume: 47, anno: 1998,
pagine: 531 - 532
SICI:
0525-1931(1998)47:8<531:SOPATP>2.0.ZU;2-J
Fonte:
ISI
Lingua:
JPN
Soggetto:
2ND-HARMONIC GENERATION;
Keywords:
LIQUID MEMBRANE-TYPE ION-SELECTIVE ELECTRODE; PHASE BOUNDARY POTENTIAL; OPTICAL SECOND HARMONIC GENERATION; PHOTORESPONSIVE IONOPHORE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
4
Recensione:
Indirizzi per estratti:
Citazione:
S. Yoshiyagawa, "STUDIES ON PERMSELECTIVITY AT THE PHASE-BOUNDARY OF ION-SELECTIVE LIQUID MEMBRANES BY OPTICAL PHENOMENA AS PROBES FOR PHASE-BOUNDARY POTENTIALS", Bunseki Kagaku, 47(8), 1998, pp. 531-532

Abstract

Cation permselectivity at the phase boundary of ionophore-incorporated liquid membranes was studied by optical phenomena as probes for phase-boundary potentials in order to understand the response mechanism ofliquid membrane-type ion-selective electrodes (ISEs) at the molecularlevel. In the first study, optical second-harmonic generation (SHG) at various plasticized poly(vinyl chloride) (PVC)-based ion-selective membranes was observed, and the existence of SHG-active, oriented cation complexes at the membrane surface was shown. By examining the correlation between the SHG and potentiometric responses, the observed SHG intensity was assumed to be a measure of the charge density at the verymembrane surface. In the second study, lipophilic derivatives of photoresponsive azobis (benzo-15-crown-5) were used as a molecular probe and the photoinduced changes in the potentiometric responses were observed. As a result, it was found that the photoinduced change in the potentiometric response behavior depends on the change in the number of primary cations permselectively extracted into the membrane side of theinterface. These studies proved the necessity to investigate the interfacial phenomena which arise at the membrane surface in addition to thermodynamic considerations in order to understand the response mechanism of liquid membrane-type ISEs.

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Documento generato il 16/07/20 alle ore 04:52:44