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000414286 0247_ $$2datacite_doi$$a10.3204/PUBDB-2018-03848
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000414286 041__ $$aEnglish
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000414286 0881_ $$aDESY-THESIS-2018-028
000414286 1001_ $$0P:(DE-HGF)0$$aValerio, Joana$$b0$$eCorresponding author$$gfemale
000414286 245__ $$aStructure of complex fluids under shear flows$$f2014-02-19 - 2018-07-31
000414286 260__ $$aHamburg$$bVerlag Deutsches Elektronen-Synchrotron$$c2018
000414286 300__ $$a137
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000414286 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis$$bphd$$mphd$$s1686227622_1886941
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000414286 502__ $$aDissertation, Universität Hamburg, 2018$$bDissertation$$cUniversität Hamburg$$d2018$$o2018-10-05
000414286 520__ $$aWith the recent developments of modern synchrotron and X-ray Free Electron Laser (XFEL) light sources high speed and micrometer sized liquid jets have become one of the most important sample delivery systems. For that reason it is highly important to develop liquid jet devices compatible with micrometer X-ray beams, which are optimized for the investigation of nanostructures and the behavior of complex liquids behavior under flow.This thesis reports a detailed X-ray scattering study of a liquid jet produced by a gas dynamic virtual nozzle (GDVN) system. Due to the very special microjet formation mechanism these injection devices offer a unique possibility to perform rheological studies at very high shear rates.In the framework of this thesis two main topics have been studied:1. The behavior of spindle-shaped hematite particles in a GDVN produced flow by WAXS.2. The impact of microjet and microdroplet geometries on the scattering patterns by SAXS.Therefore, an existing experimental setup was improved in accordance with the demands of the experiments at PETRA III, P10 beamline. The WAXS study shows a pronounced alignment of spindle-shaped particles parallel to the flow direction. The particles’ alignment is found to be depend on the particles’ aspect ratio, the used flow rates and the nozzle diameter. The degree of orientation of the particles was quantified by modeling Debye Scherrer rings describing the behavior of the spindles along and across the microjet and themicrodroplets. Hematite particles show a decrease in alignment downstream the nozzle tip and no orientation was detected in the droplets regime. The degree of alignment was studied with increasing distance from the nozzle tip. The observed loss of alignment is far higher than expected from simple rotational diffusion. The difference between these two values indicates that the particles behavior is dominated by the flow and shear cessation.The second topic of this work is a SAXS study on the impact of microjets and microdroplets geometries on the scattering patterns. A detailed map on the scattering signal was created taken along and across the jet resulting in different diffractions patterns which arise from the different jet geometries. The experimental findings were successfully modeled suggesting that both, micrometerbeam-sizes and micrometer-jet-sizes have to be taken into account in describing the results of the SAXS experiments.
000414286 536__ $$0G:(DE-HGF)POF3-6215$$a6215 - Soft Matter, Health and Life Sciences (POF3-621)$$cPOF3-621$$fPOF III$$x0
000414286 536__ $$0G:(DE-HGF)POF3-6G3$$a6G3 - PETRA III (POF3-622)$$cPOF3-622$$fPOF III$$x1
000414286 693__ $$0EXP:(DE-H253)P-P10-20150101$$1EXP:(DE-H253)PETRAIII-20150101$$6EXP:(DE-H253)P-P10-20150101$$aPETRA III$$fPETRA Beamline P10$$x0
000414286 7001_ $$0P:(DE-H253)PIP1000392$$aGruebel, Gerhard$$b1$$eThesis advisor
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