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Titolo:
COMPARISON OF DIFFERENT SPREADING TECHNIQUES FOR MONOLAYERS AT THE AIR-WATER-INTERFACE BY EXTERNAL INFRARED REFLECTION-ABSORPTION SPECTROSCOPY
Autore:
GERICKE A; SIMONKUTSCHER J; HUHNERFUSS H;
Indirizzi:
UNIV HAMBURG,INST ORGAN CHEM,MARTIN LUTHER KING PL 6 D-20146 HAMBURG GERMANY UNIV HAMBURG,INST ORGAN CHEM,MARTIN LUTHER KING PL 6 D-20146 HAMBURG GERMANY
Titolo Testata:
Langmuir
fascicolo: 11, volume: 9, anno: 1993,
pagine: 3115 - 3121
SICI:
0743-7463(1993)9:11<3115:CODSTF>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
NORMAL-ALKYL CHAINS; H STRETCHING MODES; PHASE-TRANSITIONS; LIQUID; LONG;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
23
Recensione:
Indirizzi per estratti:
Citazione:
A. Gericke et al., "COMPARISON OF DIFFERENT SPREADING TECHNIQUES FOR MONOLAYERS AT THE AIR-WATER-INTERFACE BY EXTERNAL INFRARED REFLECTION-ABSORPTION SPECTROSCOPY", Langmuir, 9(11), 1993, pp. 3115-3121

Abstract

The single shot method (SSM) and the discontinuous compression method(DCM) are compared for the film-forming substances 1-hexadecanol, hexadecanoic acid methyl ester, and L-alpha-dipalmitoylphosphatidylcholine by external infrared reflection-absorption spectroscopy. In particular, the tilt angles of the molecules, the conformational order, and the headgroup structure are analyzed. It is shown that for 1-hexadecanolin the gaseous region different tilt angles are observed between the monolayers spread by the SSM and those compressed by the DCM. In the case of hexadecanoic acid methyl ester the molecules disseminated on the water surface by the SSM are oriented more vertically, the ester carbonyl group is mainly deprotonated, and the hydrophobic chain is conformationally more ordered in comparison with the monolayer compressed by the DCM. Upon relaxation the monolayer spread by SSM approaches the characteristics of the compressed monolayer, although after 80 min this state was not attained completely. L-alpha-Dipalmitoylphosphatidylcholine monolayers spread by the SSM relaxate by achieving a higher conformational order, smaller tilt angles, and a higher deprotonation grade of the ester carbonyl groups in comparison with the initial state. Atentative explanation of the present results is given on the basis ofa kinetic model recently published by Buontempo and Rice.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/04/20 alle ore 23:54:11