Mixed monolayer studies of chlorophyll a and plastoquinone 9 at the nitrogen-water interface

Ahmed Es-Sounni, Roger Leblanc

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The surface pressure-molecular area isotherm of the chlorophyll a-plastoquinone 9 binary mixture has been studied at various molar compositions at the nitrogen-water interface. The surface pressure-molecular area isotherms of the mixtures are interpreted using the additivity rule and surface phase rule in two dimensions The mixed system conforms to ideality regardless of the molar fraction. The mixed monolayers at molar fractions of chlorophyll a between 0.3 and 0.8 show two collapse pressures, one of which (the lower) varies with the film composition with the other collapse nearly constant at approximately 27 mN m-1. Two collapses are also evident in the surface potential-molecular area isotherms. This apparent dependence of the collapse on the film composition is interpreted as a partial miscibility between the components, while complete miscibility is suggested at 0.9 mole fraction of chlorophyll a, where a single collapse pressure is observed.

Original languageEnglish
Pages (from-to)1578-1581
Number of pages4
JournalLangmuir
Volume8
Issue number6
StatePublished - Dec 1 1992
Externally publishedYes

Fingerprint

Plastoquinone
chlorophylls
Chlorophyll
Monolayers
Nitrogen
Isotherms
nitrogen
Water
isotherms
water
Solubility
Chemical analysis
solubility
phase rule
Surface potential
Binary mixtures
binary mixtures
chlorophyll a

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Mixed monolayer studies of chlorophyll a and plastoquinone 9 at the nitrogen-water interface. / Es-Sounni, Ahmed; Leblanc, Roger.

In: Langmuir, Vol. 8, No. 6, 01.12.1992, p. 1578-1581.

Research output: Contribution to journalArticle

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