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Counterion distribution in a spherical charged sparse brush |
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| Authors: | F Muller P Fontaine M Delsanti L Belloni J Yang YJ Chen JW Mays P Lesieur M Tirrell P Guenoun |
| Institution: | (1) Service de Physique de l'Etat Condensé, CEA Saclay, F-91191 Gif-sur-Yvette Cedex, France, FR;(2) Laboratoire pour l'Utilisation du Rayonnement Electromagnétique, Centre Universitaire Paris-Sud, bat. 209D, BP 34, 91898 Orsay Cedex, France, FR;(3) Service de Chimie Moléculaire, CEA Saclay, F-91191 Gif-sur-Yvette Cedex, France, FR;(4) Department of Chemistry, University of Alabama at Birmingham, Birmingham, AL 35294, USA, US;(5) Exxon Chemical Co., Baytown, TX 77522, USA, US;(6) Departments of Chemical Engineering and of Materials, University of California, Santa Barbara, CA 93106, USA, US |
| Abstract: | The counterion distribution within a spherical polyelectrolyte sparse brush was measured by small-angle X-ray scattering using contrast variation with different counterions by means of ion dialysis. The brush was made by self-association of charged diblock copolymers. Thanks to the contrast variation method, we were able to separate the signal due to the monomers and the signal due to the counterions. At a small length scale, it is demonstrated that the system behaves as independent charged rods whose counterion distribution follows the Poisson-Boltzmann model. Received 14 February 2001 and Received in final form 2 May 2001 |
| Keywords: | PACS 83 80 Uv Block copolymers – 82 35 Rs Polyelectrolytes – 61 10 Eq X-ray scattering (including small-angle scattering) |
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