Poster

PUBDB-2015-03861

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Alignment of spindle-shaped particles in a liquid jet studied by SAXS experiments

Steinke, I. (Corresponding author)DESY* ; Valerio, J.DESY* ; Walther, M.DESY* ; Lehmkuehler, F.DESY* ; Schroer, M.DESY* ; Fischer, B.>Extern* ; Jain, A.DESY* ; Gruebel, G.DESY*

2015

Abstract: Colloidal dispersions under shear show non-Newtonian behavior, based ontheir microstructure, which influences macroscopic parameters, e.g. viscosityand density. Research has focused mainly on dispersions of sphericalparticles studied by rheological methods. However, particle shapeanisotropy introduces additional effects:a) The local fluid flow around a non-spherical particle is different from thataround a spherical particle.b) Non-spherical particles can orient themselves affecting the properties ofthe dispersion.c) The particles’ shape may additionally influence the particle-particleinteractions.Spindle-shaped hematite colloids (α-Fe$_{2}$O$_{3}$) are an excellent test case tostudy alignment of particles under shear using x-rays, as thecharacterization of such particles with x-ray scattering is well understood.Microfluidic liquid jets allow the unique possibility to investigate spatiallyconfined nanoscale objects under shear. This experiment provides newinsights in nano-rheology studies of spindle-shaped particles due to highshear rates ẏ > 10$^{5}$ s$^{-1}$ as compared to conventional rheometers.

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Contributing Institute(s):

1. Coherent X-ray Scattering (FS-CXS)

Research Program(s):

1. 6215 - Soft Matter, Health and Life Sciences (POF3-621) (POF3-621)
2. 6G3 - PETRA III (POF3-622) (POF3-622)

Experiment(s):

1. PETRA Beamline P10 (PETRA III)

Appears in the scientific report 2015

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Database coverage:

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