The cross-sectional area of the PE and PG polar head groups is smaller than the
cross-sectional area of the unsaturated hydrocarbon chains. In these bilayers the
liquid hydrocarbon chains determine the packing, while the polar head groups have
sufficient space to interact with water. Indeed, in the bilayer assembly they are well
hydrated [71]. In these bilayers the electric potentials have a minor effect on the
molecular scale reorientations.
Natural cell membranes of eukaryote are characterized by transverse and lateral
asymmetry. LB-LS transfer facilitates fabrication of such complex molecular assemblies mimicking the composition and structure of the plasma membrane of eukaryote. LB-LS bilayers containing phospholipid (DMPC) and sterol (cholesterol) in the
inner leaflet and DMPC, cholesterol and glycolipids (e.g. gangliosides G M1 or G D1a )
in the outer leaflet have been prepared on the gold electrode surface [30, 33, 70].
The capacitance minimum of these bilayers is in the range of 1.7–4.0 μF cm
À2 .
3000
2975
2950
2925
2900
2875
2850
2825
as
(CH 2 )
s
(CH 2 )
s
(CH 3 )
as
(CH 3 )
a)
c)
b)
Wavenumber / cm
-1
S 0.004
-E
Fig. 3.10 PM IRRA spectra
in the CH stretching modes
region of the (a) DMPEDMPG in 50 mM KClO 4 in
D 2 O; (b) POPE-POPG:
DPPG (0.95:0.05 mole) and
(c) DOPE-POPG:DPPG
(0.95:0.05 mole) in 50 mM
KClO 4 with 5 mM Mg
(KClO 4 ) 2 in D 2 O bilayers on
the Au(111) electrode
surface at E ¼ À0.80,
À0.65, À0.55, À0.40,
À0.20, 0.25 and 0.40 V
versus Ag/AgCl. Direction
of the potential scan is
marked in the figure
64
3 In Situ PM IRRAS Studies of Redox-Inactive Molecular Films Adsorbed on. . .
cross-sectional area of the unsaturated hydrocarbon chains. In these bilayers the
liquid hydrocarbon chains determine the packing, while the polar head groups have
sufficient space to interact with water. Indeed, in the bilayer assembly they are well
hydrated [71]. In these bilayers the electric potentials have a minor effect on the
molecular scale reorientations.
Natural cell membranes of eukaryote are characterized by transverse and lateral
asymmetry. LB-LS transfer facilitates fabrication of such complex molecular assemblies mimicking the composition and structure of the plasma membrane of eukaryote. LB-LS bilayers containing phospholipid (DMPC) and sterol (cholesterol) in the
inner leaflet and DMPC, cholesterol and glycolipids (e.g. gangliosides G M1 or G D1a )
in the outer leaflet have been prepared on the gold electrode surface [30, 33, 70].
The capacitance minimum of these bilayers is in the range of 1.7–4.0 μF cm
À2 .
3000
2975
2950
2925
2900
2875
2850
2825
as
(CH 2 )
s
(CH 2 )
s
(CH 3 )
as
(CH 3 )
a)
c)
b)
Wavenumber / cm
-1
S 0.004
-E
Fig. 3.10 PM IRRA spectra
in the CH stretching modes
region of the (a) DMPEDMPG in 50 mM KClO 4 in
D 2 O; (b) POPE-POPG:
DPPG (0.95:0.05 mole) and
(c) DOPE-POPG:DPPG
(0.95:0.05 mole) in 50 mM
KClO 4 with 5 mM Mg
(KClO 4 ) 2 in D 2 O bilayers on
the Au(111) electrode
surface at E ¼ À0.80,
À0.65, À0.55, À0.40,
À0.20, 0.25 and 0.40 V
versus Ag/AgCl. Direction
of the potential scan is
marked in the figure
64
3 In Situ PM IRRAS Studies of Redox-Inactive Molecular Films Adsorbed on. . .