The name is absent

450

400

2      4       6      8      10     12      14

Tip-sample separation D (nm)

350

300

⅛ 250
ц.

200

150

100

50

Figure 3.7: Comparison of the AFM data with the van der Waals computational model.
The AFM data and the electrostatic simulation shown here are the same as in Figure 3.2.

As seen in Figure 3.7, the inclusion of the van der Waal attraction does not account for
the discrepancy in the previous model. Even when unrealistically large values of Ли were
used (several orders of magnitude larger than the actual Ah) we were not able to see a fit
to the experimental data.

3.3.2 Charge regulation due to counterion binding; Iipids vs. silicon nitride

In the Gouy-Chapman-Stem (GCS) theory of lipid membrane electrostatics, a source of
charge regulation is the binding of counter ions onto the charged headgroups of the lipids.
In applying the GCS model to our system, electrolyte cations bind to the PS headgroups
to form a Stem layer. The cation binding is described by a Langmuir isotherm and the
effect of the surface potential on the cation surface concentration is taken into account.

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