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Free-standing black films drawn from a diblock copolymer aqueous solution were studied by x-ray reflectivity. Because of the hydrophilic part of the copolymer which is a highly charged polyelectrolyte (NaPSS), such films behave as two opposing charged brushes. Above a determined threshold the thickness of the double brush decreases slowly as electrolyte is added. These results are in good agreement with recent mean-field theories.
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Guénoun et al. (1995) studied this question.
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