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000111854 0247_ $$2DOI$$a10.1103/PhysRevLett.109.048302
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000111854 084__ $$2WoS$$aPhysics, Multidisciplinary
000111854 1001_ $$0P:(DE-Juel1)130719$$aHolmqvist, P.$$b0$$uFZJ
000111854 245__ $$aStructure and Dynamics of Loosely Cross-Linked Ionic Microgel Dispersions in the Fluid Regime
000111854 260__ $$aCollege Park, Md.$$bAPS$$c2012
000111854 300__ $$a048302
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000111854 440_0 $$04925$$aPhysical Review Letters$$v109$$x0031-9007$$y4
000111854 500__ $$aWe thank Simon Rogers (Research Centre Julich) for carefully proofreading the letter. P. S. M. and P. S. acknowledge financial support from the Swiss National Science Foundation. G. N. and M. H. acknowledge support from the Deutsche Forschungsgemeinschaft (project B2 in SFB-TR6).
000111854 520__ $$aWe report a comprehensive experimental-theoretical study of the temperature-and concentration-dependent swelling behavior of weakly cross-linked PNiPAm ionic microgel particles in the deionized fluid phase. The particles swell reversibly when the dispersion is cooled from the collapsed state to lower temperatures. While the collapsed state shows no dependence on the microgel number density, the swelling at lower T is more pronounced at lower concentrations. The static pair correlations and short-time diffusion functions, and the concentration and temperature dependence of the microgel radius and effective charge, are studied using static and dynamic light scattering in combination with state-of-the-art analytical theoretical schemes based on a Yukawa-type effective pair potential and a core-shell model. We show that only such a combined, simultaneous fit of static and dynamic scattering functions allows for an unambiguous determination of the microgel radius and effective charge.
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000111854 7001_ $$0P:(DE-HGF)0$$aMohanty, P.S.$$b1
000111854 7001_ $$0P:(DE-Juel1)130858$$aNägele, G.$$b2$$uFZJ
000111854 7001_ $$0P:(DE-HGF)0$$aSchurtenberger, P.$$b3
000111854 7001_ $$0P:(DE-HGF)0$$aHeinen, M.$$b4
000111854 773__ $$0PERI:(DE-600)1472655-5$$a10.1103/PhysRevLett.109.048302$$gVol. 109, p. 048302$$p048302$$q109<048302$$tPhysical review letters$$v109$$x0031-9007$$y2012
000111854 8567_ $$uhttp://dx.doi.org/10.1103/PhysRevLett.109.048302
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