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000474356 0247_ $$2datacite_doi$$a10.3204/PUBDB-2022-00714
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000474356 1001_ $$0P:(DE-H253)PIP1031947$$aDartsch, Michael$$b0$$eCorresponding author$$gmale
000474356 245__ $$aHigher-Order Correlations in Complex Liquids$$f2016-10-01 - 2022-01-20
000474356 260__ $$aHamburg$$bVerlag Deutsches Elektronen-Synchrotron DESY$$c2022
000474356 300__ $$a113
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000474356 502__ $$aDissertation, Universität Hamburg, 2022$$bDissertation$$cUniversität Hamburg$$d2022$$o2022-01-20
000474356 520__ $$aColloidal dispersions show a peculiar rheological behavior known as shear-thinning,that is the viscosity of a sample decreases with increasing shear rate. In thiswork the underlying structural changes that lead to this effect are studied byusing samples consisting of polyacrylate-coated silica nanoparticles dispersed inpolyethylene glycol-200. The silica particles are synthesized using a modifiedStöber method and samples with volume fractions between $\phi$ = 0.22 and $\phi$ = 0.53are prepared.The experiments performed in this thesis utilize a setup combining a cone-platerheometer with a small-angle x-ray scattering (SAXS) setup. In this way rheological and structural properties of the samples can be measured simultaneously.Data collected from the SAXS measurements are evaluated further using x-raycross-correlation analysis (XCCA) in order to study higher-order correlations andlocal symmetries.It is shown that under shear the highly concentrated nanoparticle dispersionsform structures with hexagonal symmetry which can be interpreted as layersof hexagonal close-packed spheres. From XCCA the sixth Fourier coefficient ofthe cross-correlation function can be used as an order parameter to quantify thedegree of local hexagonal order. In the regime of intermediate shear rates thedegree of hexagonal order is correlated with the magnitude of the shear rate. Anincrease of the shear rate corresponds to an increase of local hexagonal order.Since the viscosity is decreasing with increasing shear rate it can be concludedthat a higher degree of local order minimizes internal friction of the sample, andtherefore lowers its viscosity.
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000474356 7001_ $$0P:(DE-H253)PIP1000392$$aGruebel, Gerhard$$b1$$eThesis advisor$$udesy
000474356 7001_ $$0P:(DE-H253)PIP1022042$$aPearson, Arwen$$b2$$eThesis advisor
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