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  Connecting structure, dynamics and viscosity in sheared soft colloidal liquids: a medley of anisotropic fluctuations

Westermeier, F., Pennicard, D., Hirsemann, H., Wagner, U. H., Rau, C., Graafsma, H., et al. (2016). Connecting structure, dynamics and viscosity in sheared soft colloidal liquids: a medley of anisotropic fluctuations. Soft Matter, 12(1), 171-180. doi:10.1039/C5SM01707F.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-5385-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-5386-9
Genre: Journal Article

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http://dx.doi.org/10.1039/C5SM01707F (Publisher version)
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 Creators:
Westermeier, Fabian1, 2, Author              
Pennicard, David1, 3, Author
Hirsemann, Helmut1, 3, Author
Wagner, Ulrich H.4, Author
Rau, Christoph4, Author
Graafsma, Heinz1, 3, Author
Schall, Peter5, Author
Lettinga, M. Paul6, Author
Struth, Bernd1, 3, Author
Affiliations:
1Center for Free-Electron Laser Science, Notkestraße 85, 22607 Hamburg, Germany, ou_persistent22              
2Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938288              
3DESY, Notkestraße 85, 22607 Hamburg, Germany, ou_persistent22              
4Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire, UK, ou_persistent22              
5Van der Waals-Zeeman Institute, University of Amsterdam, POSTBUS 94485, 1090 GL Amsterdam, The Netherlands, ou_persistent22              
6Forschungszentrum Jülich, Institute of Complex Systems (ICS-3), 52425 Jülich, Germany, ou_persistent22              

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 Abstract: Structural distortion and relaxation are central to any liquid flow. Their full understanding requires simultaneous probing of the mechanical as well as structural and dynamical response. We provide the first full dynamical measurement of the transient structure using combined coherent X-ray scattering and rheology on electrostatically interacting colloidal fluids. We find a stress overshoot during the start-up of shear which is due to the strong anisotropic overstretching and compression of nearest-neighbor distances. The rheological response is reflected in uncorrelated entropy-driven intensity fluctuations. While the structural distortion under steady shear is well described by Smoluchowski theory, we find an increase of the particle dynamics beyond the trivial contribution of flow. After the cessation of shear, the full fluid microstructure and dynamics are restored, both on the structural relaxation timescale. We thus find unique structure-dynamics relations in liquid flow, responsible for the macroscopic rheological behavior of the system.

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Language(s): eng - English
 Dates: 2015-07-102015-09-262015-10-092016-01-07
 Publication Status: Published in print
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1039/C5SM01707F
 Degree: -

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Title: Soft Matter
  Abbreviation : Soft Matter
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 12 (1) Sequence Number: - Start / End Page: 171 - 180 Identifier: ISSN: 1744-683X
CoNE: /journals/resource/1744-683X