000888934 001__ 888934
000888934 005__ 20201230100830.0
000888934 037__ $$aFZJ-2020-05333
000888934 1001_ $$0P:(DE-Juel1)130797$$aLettinga, M. P.$$b0$$eCorresponding author
000888934 1112_ $$aInternational Congress on Rheology 2020$$cRio de Janeiro (virtual)$$d2020-12-14 - 2020-12-17$$wBrasil
000888934 245__ $$aAnomalous rheological response of nematic platelets studied by 3D Rheo-SAXS and XPCS
000888934 260__ $$c2020
000888934 3367_ $$033$$2EndNote$$aConference Paper
000888934 3367_ $$2DataCite$$aOther
000888934 3367_ $$2BibTeX$$aINPROCEEDINGS
000888934 3367_ $$2DRIVER$$aconferenceObject
000888934 3367_ $$2ORCID$$aLECTURE_SPEECH
000888934 3367_ $$0PUB:(DE-HGF)6$$2PUB:(DE-HGF)$$aConference Presentation$$bconf$$mconf$$s1609233121_11204$$xPlenary/Keynote
000888934 520__ $$aDispersions of colloidal Gibbsite platelets in the nematic phase show intriguing anomalous behaviour when sheared, due to the strong wall anchoring of such systems. When subjecting this system to Large Amplitude Oscillatory Shear, an elastic response is observed at low strain amplitudes, but time-resolved rheo-SAXS experiments show that the structural response is symmetry broken. At high strain amplitude a yielding transition between elastic and plastic deformation is observed during a period, accompanied by a flipping of the director. When applying Large Amplitude Oscillatory Stress, the system displays a strong offsets in the rheological response as well as asymmetrical behavior in the microscopic structural response. With increasing stress amplitude the offset of the rheological response diminishes and the microscopic response becomes more symmetric. However, this strongly depends on the frequency of the stress input, and hence the time necessary for the system to yield. Here we tracked the full 3D rotational motion of the director by employing plate-plate and concentric cylinder Couette geometries as well as a vertical X-ray beam. Finally, we show that the response throughout the gap is strongly inhomogeneous, as well in structure as in velocity. To this end we performed XPCS measurements in ``tangential" scattering geometry in a Couette cell to obtain velocity profiles.
000888934 536__ $$0G:(DE-HGF)POF3-551$$a551 - Functional Macromolecules and Complexes (POF3-551)$$cPOF3-551$$fPOF III$$x0
000888934 7001_ $$0P:(DE-Juel1)180697$$aKorculanin, Olivera$$b1
000888934 909CO $$ooai:juser.fz-juelich.de:888934$$pVDB
000888934 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)130797$$aForschungszentrum Jülich$$b0$$kFZJ
000888934 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)180697$$aForschungszentrum Jülich$$b1$$kFZJ
000888934 9131_ $$0G:(DE-HGF)POF3-551$$1G:(DE-HGF)POF3-550$$2G:(DE-HGF)POF3-500$$3G:(DE-HGF)POF3$$4G:(DE-HGF)POF$$aDE-HGF$$bKey Technologies$$lBioSoft – Fundamentals for future Technologies in the fields of Soft Matter and Life Sciences$$vFunctional Macromolecules and Complexes$$x0
000888934 9141_ $$y2020
000888934 920__ $$lyes
000888934 9201_ $$0I:(DE-Juel1)IBI-4-20200312$$kIBI-4$$lBiomakromolekulare Systeme und Prozesse$$x0
000888934 980__ $$aconf
000888934 980__ $$aVDB
000888934 980__ $$aI:(DE-Juel1)IBI-4-20200312
000888934 980__ $$aUNRESTRICTED