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000429201 1001_ $$0P:(DE-H253)PIP1023108$$aFrenzel, Lara$$b0$$eCorresponding author$$gfemale
000429201 245__ $$aStructure and Dynamics of Complex Liquids - The Phase Behaviour of Silica-PNIPAm Nanogels$$f2015-09-16 - 2019-10-18
000429201 260__ $$aHamburg$$bVerlag Deutsches Elektronen-Synchrotron$$c2019
000429201 300__ $$a101
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000429201 502__ $$aDissertation, Universität Hamburg, 2019$$bDissertation$$cUniversität Hamburg$$d2019
000429201 520__ $$aIn this thesis, the structure and dynamics of highly concentrated core-shell nanogel particlescomposed of a silica core and a poly(N-isoproylacrylamide) (PNIPAm) shell suspendedin water are studied. The particles were synthesised with dierent core-to-shell size ratiosand prepared at various concentrations with volume fractions e between approximately0:004 and 2. X-ray photon correlation spectroscopy (XPCS) enables to follow the dynamical,small-angle X-ray scattering (SAXS) the structural changes of the thermo-responsivenanogel particles which undergo a volume phase transition at a so-called lower criticalsolution temperature (LCST) of 32C. All samples were studied in a broad temperaturerange around the LCST with approximately 15C < T < 45C and the main focus is ondensely-packed systems.For a system with e = 0:55, the structural relaxation time c was found to decreasewith increasing temperature. Above the LCST, the structural relaxation time initiallycontinues to decrease. The eect is accompanied by a transition from stretched to compressedexponential behaviour of the intensity autocorrelation functions, which could bedetermined by analysing the intensity autocorrelation functions. Upon further heating asudden slowing down at a critical temperature Tc  37C. In parallel, the q-dependenceof the relaxation time shows an anomalous change from c / q
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000429201 7001_ $$0P:(DE-H253)PIP1008819$$aLehmkühler, Felix$$b1$$eThesis advisor
000429201 7001_ $$0P:(DE-H253)PIP1000392$$aGruebel, Gerhard$$b2$$eThesis advisor
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