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  Brownian and advective dynamics in microflow studied by coherent X-ray scattering experiments

Urbani, R., Westermeier, F., Banusch, B., Sprung, M., & Pfohl, T. (2016). Brownian and advective dynamics in microflow studied by coherent X-ray scattering experiments. Journal of Synchrotron Radiation, 23(6), 1401-1408. doi:10.1107/S1600577516012613.

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JSynRad_23_1401-1408_2016.pdf (Publisher version), 2MB
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JSynRad_23_1401-1408_2016.pdf
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2016
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© International Union of Crystallography

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http://dx.doi.org/10.1107/S1600577516012613 (Publisher version)
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 Creators:
Urbani, R.1, Author
Westermeier, Fabian2, 3, Author           
Banusch, B.1, Author
Sprung, M.4, Author
Pfohl, T.1, Author
Affiliations:
1Department of Chemistry, University of Basel, 4056 Basel, Switzerland, ou_persistent22              
2Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938288              
3CFEL, 22761 Hamburg, Germany, ou_persistent22              
4Photon Science, Deutsches Elektronen-Synchrotron, 22607 Hamburg, Germany, ou_persistent22              

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Free keywords: microfluidics; X-ray scattering; photon correlation spectroscopy; flow profiles; flow geometries; particle dynamics
 Abstract: Combining microfluidics with coherent X-ray illumination offers the possibility to not only measure the structure but also the dynamics of flowing samples in a single-scattering experiment. Here, the power of this combination is demonstrated by studying the advective and Brownian dynamics of colloidal suspensions in microflow of different geometries. Using an experimental setup with a fast two-dimensional detector and performing X-ray correlation spectroscopy by calculating two-dimensional maps of the intensity auto-correlation functions, it was possible to evaluate the sample structure and furthermore to characterize the detailed flow behavior, including flow geometry, main flow directions, advective flow velocities and diffusive dynamics. By scanning a microfocused X-ray beam over a microfluidic device, the anisotropic auto-correlation functions of driven colloidal suspensions in straight, curved and constricted microchannels were mapped with the spatial resolution of the X-ray beam. This method has not only a huge potential for studying flow patterns in complex fluids but also to generally characterize anisotropic dynamics in materials.

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Language(s): eng - English
 Dates: 2016-03-072016-08-042016-11-01
 Publication Status: Published online
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1107/S1600577516012613
 Degree: -

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Title: Journal of Synchrotron Radiation
  Abbreviation : J. Synchrotron Radiat.
Source Genre: Journal
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Publ. Info: Copenhagen, Denmark : Published for the International Union of Crystallography by Munksgaard
Pages: - Volume / Issue: 23 (6) Sequence Number: - Start / End Page: 1401 - 1408 Identifier: ISSN: 0909-0495
ISSN: 1600-5775
CoNE: https://pure.mpg.de/cone/journals/resource/954925562624