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000424877 1001_ $$0P:(DE-H253)PIP1023108$$aFrenzel, Lara$$b0$$eCorresponding author
000424877 245__ $$aAnomalous Dynamics of Concentrated Silica-PNIPAm Nanogels
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000424877 520__ $$aWe present the structure and dynamics of highly concentrated core–shell nanoparticles composed of a silica core and a poly(N-isoproylacrylamide) (PNIPAm) shell suspended in water. With X-ray photon correlation spectroscopy, we are able to follow dynamical changes over the volume phase transition of PNIPAm at LCST = 32 °C. On raising the temperature beyond LCST, the structural relaxation times continue to decrease. The effect is accompanied by a transition from stretched to compressed exponential shape of the intensity autocorrelation function. Upon further heating, we find a sudden slowing down for the particles in their collapsed state. The q dependence of the relaxation time shows an anomalous change from $τ_c ∝ q^{–3}$ to $τ_c ∝ q^{–1}$. Small angle X-ray scattering data evidence a temperature-induced transition from repulsive to attractive forces. Our results indicate a temperature-induced phase transition from a colloidal liquid with polymer-driven dynamics toward a colloidal gel.
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000424877 7001_ $$0P:(DE-H253)PIP1008819$$aLehmkühler, Felix$$b1$$eCorresponding author
000424877 7001_ $$0P:(DE-H253)PIP1023300$$aLokteva, Irina$$b2
000424877 7001_ $$0P:(DE-HGF)0$$aNarayanan, Suresh$$b3
000424877 7001_ $$0P:(DE-H253)PIP1007141$$aSprung, Michael$$b4$$udesy
000424877 7001_ $$0P:(DE-H253)PIP1000392$$aGrübel, Gerhard$$b5$$udesy
000424877 773__ $$0PERI:(DE-600)2522838-9$$a10.1021/acs.jpclett.9b01690$$gp. 5231 - 5236$$p5231 - 5236$$tThe journal of physical chemistry letters$$v10$$x1948-7185$$y2019
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