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000038456 0247_ $$2DOI$$a10.1016/j.jcis.2004.02.047
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000038456 084__ $$2WoS$$aChemistry, Physical
000038456 1001_ $$0P:(DE-Juel1)VDB1270$$aPohlmeier, A.$$b0$$uFZJ
000038456 245__ $$aIonization of short polymethacrylic acid: titration, DLS and model calculations
000038456 260__ $$aAmsterdam [u.a.]$$bElsevier$$c2004
000038456 300__ $$a369 - 380
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000038456 440_0 $$03193$$aJournal of Colloid and Interface Science$$v273$$x0021-9797
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000038456 520__ $$aIn this work the charging of polymethacrylic acid in excess electrolyte solution is investigated experimentally by titration and dynamic light scattering. The results are analyzed by a penetrable sphere model, which employs the Poisson-Boltzmann equation for the description of electrostatic interactions and takes into account specific binding of H+ and Na+. The evaluation of the DLS data yields two relaxation modes. The slow mode is present only at finite degrees of charging and is therefore caused by collective diffusion. The fast mode, which corresponds to diffusion coefficients in the range from (1.1 to 1.5) x 10(-10) m2 s(-1), is present over the whole pH range. This reflects the diffusional dynamics of the polyion itself and allows the calculation of hydrodynamic radii for equivalent spheres (RH). These increase from 1.5 nm at pH 2.14 up to 1.8 nm for a degree of deprotonation alpha=0.47 at pH 5.86. With a further increase of pH the radii slightly decrease to 1.6 nm. Setting the radius of the penetrable sphere equal to RH, we can successfully model the overall charging curve with logK0H=4.85 and logK0Na=-0.6. This means that weak complexes of the type COO---Na are formed, which reduce the effective charge inside the polyelectrolyte coil.
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000038456 65320 $$2Author$$apolyelectrolyte
000038456 65320 $$2Author$$apolymethacrylic acid
000038456 65320 $$2Author$$aPMA
000038456 65320 $$2Author$$acharging
000038456 65320 $$2Author$$adynamic light scattering
000038456 65320 $$2Author$$aDLS
000038456 65320 $$2Author$$amodel
000038456 65320 $$2Author$$anonlinear Poisson-Boltzmann equation
000038456 65320 $$2Author$$aPDE2D
000038456 65320 $$2Author$$adirect counterion binding
000038456 7001_ $$0P:(DE-Juel1)VDB12272$$aHaber-Pohlmeier, S.$$b1$$uFZJ
000038456 773__ $$0PERI:(DE-600)1469021-4$$a10.1016/j.jcis.2004.02.047$$gVol. 273, p. 369 - 380$$p369 - 380$$q273<369 - 380$$tJournal of colloid and interface science$$v273$$x0021-9797$$y2004
000038456 8567_ $$uhttp://dx.doi.org/10.1016/j.jcis.2004.02.047
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000038456 9201_ $$0I:(DE-Juel1)VDB58$$d31.12.2006$$gIBI$$kIBI-2$$lBiologische Strukturforschung$$x0
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