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Titolo:
Electro-osmotic and pressure-driven flow properties of frits for packed column capillary electrochromatography prepared from functionalised and bare silica packings
Autore:
Hilder, EF; Klampfl, CW; Macka, M; Haddad, PR; Myers, P;
Indirizzi:
Univ Tasmania, Sch Chem, Separat Sci Grp, Hobart, Tas 7001, Australia UnivTasmania Hobart Tas Australia 7001 Grp, Hobart, Tas 7001, Australia Univ Leeds, Sch Chem, Leeds LS2 9JT, W Yorkshire, England Univ Leeds Leeds W Yorkshire England LS2 9JT S2 9JT, W Yorkshire, England
Titolo Testata:
ANALYST
fascicolo: 1, volume: 125, anno: 1999,
pagine: 1 - 4
SICI:
0003-2654(1999)125:1<1:EAPFPO>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
LIQUID-CHROMATOGRAPHY; PERFORMANCE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Haddad, PR Univ Tasmania, Sch Chem, Separat Sci Grp, GPO Box 252-75, Hobart, Tas 7001, Australia Univ Tasmania GPO Box 252-75 Hobart Tas Australia 7001 ustralia
Citazione:
E.F. Hilder et al., "Electro-osmotic and pressure-driven flow properties of frits for packed column capillary electrochromatography prepared from functionalised and bare silica packings", ANALYST, 125(1), 1999, pp. 1-4

Abstract

Changes in electro-osmotic flow (EOF) induced in an open fused silica capillary by the introduction of a single packing retainer (referred to as a 'frit' throughout the article) are investigated. Frits located in a 34.5 cm long capillary close to the detection window, as used commonly in packed column capillary electro-chromatography, were made by sintering silica based packing materials having varying functionalities (bare silica, ODS-silica, astrong cation exchange packing (SCX) and a strong anion exchanger (SAX) at430 degrees C for 15 s. The contributions of such frits to the total EOF measured in the capillary are discussed. Despite the high temperature of heating of the packing, sufficient residual functional groups remained on the frit such that distinctively different EOF behaviour was observed for each type of packing. Frits made from materials providing negative surface charges, such as silica, ODS-silica and SCX, increased the magnitude of the cathodic EOF compared to the open capillary. On the other hand, a substantial anodic EOF of -1.88 x 10(-8) m(2) V-1 s(-1) was produced by introduction of a single frit made from the SAX material. An explanation of this behaviour is given, based on the hypothesis that the EOF generated by the frit determines the overall flow in the whole open capillary. The frit is considered to work as a pump and overrides the EOF generated at the capillary wall.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 11/07/20 alle ore 10:06:25