Do Spherical Polyelectrolyte Brushes Interdigitate?

Details Do Spherical Polyelectrolyte Brushes Interdigitate? Do Spherical Polyelectrolyte Brushes Interdigitate?

2004-09-28

arxiv.org/abs/cond-mat/0409731v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures, accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.93.177801

The structure of spherical micelles of the diblock copolymer poly(styrene-block-acrylic acid) in water was investigated with small angle neutron scattering (SANS) and contrast matching. We have monitored inter-micelle correlation and the extension of the polyelectrolyte chains in the coronal layer through the overlap concentration. Irrespective of ionic strength, the corona shrinks with increasing packing fraction. Furthermore, at high charge and minimal screening conditions, the corona layers interpenetrate once the volume fraction exceeds the critical value 0.53.

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