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Title: X-ray scattering in the vorticity direction and rheometry from confined fluids

An X-ray flexure-based microgap rheometer (X-FMR) has been designed for combining rheology and in situ small-angle X-ray scattering from the vorticity plane. The gap distance can be varied continuously from 500 μm down to several μm, which provides the unique possibility to generate a strong confinement for many complex fluids. A singular advantage of this setup is the possibility to directly probe the vorticity direction of the flow field with a microfocus X-ray beam and to probe the structural response of the fluid to combined shear and confinement in the vorticity plane. The sliding-plate setup operates over a wide range of shear rates of γ{sup .} = 10{sup −3}–10{sup 3} s{sup −1} and strains in the range of 10{sup −4}–10{sup 2}. The flexure-based bearing maintains the plate parallelism within 10{sup −5} rad. The X-FMR requires very small sample volumes on the order of 10 μl. The applicability of the device is demonstrated here with limited examples of a nematic suspension of fd virus (rods), and a crystalline suspension containing sterically stabilized polystyrene-butylacrylate latex particles.
Authors:
 [1] ;  [2] ; ; ;  [1] ;  [1] ;  [3] ;  [4] ;  [5] ;  [6] ;  [1] ;  [7]
  1. Department of Chemical Engineering, KU Leuven, 3001 Leuven (Belgium)
  2. (Germany)
  3. (China)
  4. Institute of Complex Systems (ICS-3), Forschungszentrum Jülich, 52425 Jülich (Germany)
  5. (Belgium)
  6. Centre de Recherche Paul-Pascal, CNRS – Université de Bordeaux, 33600 Pessac (France)
  7. (Switzerland)
Publication Date:
OSTI Identifier:
22308835
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 6; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BEARINGS; EQUIPMENT; FLUIDS; MECHANICAL PROPERTIES; PLATES; POLYSTYRENE; RHEOLOGY; SHEAR; SMALL ANGLE SCATTERING; STRAINS; SUSPENSIONS; X-RAY DIFFRACTION