Fluorescence Spectroscopy as a Tool for Investigating the Self-Organized Polyelectrolyte Systems - Self Organized Nanostructures of Amphiphilic Block Copolymers - page 234

Fig. 25 Snapshot pf
PS-PMA micelle at pH 6 and
I 0.01

Fig. 26 Simulated
dependence of R G of
PS-PMA micelles on pH
for ionic strengths, I ,of0.01
and 0.01

30

I = 0.01

27

I = 0.1

24

4 6 8 10 12

pH

to document the basic correctness of the model and the simulation procedure used.
We would like to point out that the pronounced coiling of the shell-forming chains
at the micellar periphery, where the degree of dissociation and electrostatic interac-
tions are important, demonstrates that the constraint imposed by the a priori assumed
spherical symmetry of the electrostatic field is weak and does not artificially restrict
the conformational behavior of individual chains.
Furthermore, we discuss data that are directly related to the PE behavior at low
close to p K A . Figure 27 shows the electrostatic potential as a function of the dis-
tance from the micellar center, r (the function related to the vertical scale on the
right) and the r -dependent concentration profiles of the positive and negative charge