Neutron scattering-length density (nSLD) profiles, ρb(z), calculated for the VSD:POPC membrane
tethered to the surface of a SiNiSi multilayer substrate (upper left)
and for the SAM chemisorbed onto the surface of a SiNiSi multilayer
substrate (upper right), each at a transmembrane potential of 0 mV.
The aqueous buffered KCl electrolyte was in 90% D2O:10%
H2O. The respective difference nSLD profiles,
Δρb(z), for each case are
shown in the panels below for the pairs of potentials indicated. The
nSLD profiles are in units of 10–6/ Å2.