Local surface potentials and electric dipole moments of lipid monolayers contributions of the water lipid and the lipid air interfaces

Vogel, V.; Moebius, D.

Journal of Colloid and Interface Science 126(2): 408-420

1988


ISSN/ISBN: 0021-9797
DOI: 10.1016/0021-9797(88)90140-3
Accession: 007518035

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Abstract
The water/air interface is split into two interfaces by the formation of a lipid monolayer, i.e., the water/lipid and the lipid/air interface. The absolute contribution of the lipid/air interface to the total surface potential is determined by partial dipole compensation in a specially designed molecular assembly presented in this paper. The dipole moment per terminal CH3-group of aligned hydrocarbon chains within a close-packed monolayer is +0.35 D, directed from the monolayer (-) to the air (+). The local and effective dipole moments of hydrated lipid head groups can now be calculated from surface potential measurements since the contribution of the lipid/air interface is known. Such data are given for various charged, zwitterionic, and unchanged lipids.