Brownian and advective dynamics in microflow studied by coherent X-ray scattering experiments
| Autor: | Michael Sprung, Thomas Pfohl, Fabian Westermeier, Raphael Urbani, Benjamin Banusch |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
Nuclear and High Energy Physics Radiation Scattering business.industry Microfluidics 02 engineering and technology Mechanics 021001 nanoscience & nanotechnology 01 natural sciences Physics::Fluid Dynamics Optics Flow (mathematics) ddc:540 0103 physical sciences Brownian dynamics 010306 general physics 0210 nano-technology Anisotropy business Instrumentation Brownian motion Beam (structure) Complex fluid |
| Zdroj: | Journal of Synchrotron Radiation Journal of synchrotron radiation 23(6), 1401-1408 (2016). doi:10.1107/S1600577516012613 J. Synchrotron Rad. |
| ISSN: | 1600-5775 |
| DOI: | 10.1107/s1600577516012613 |
| Popis: | Journal of synchrotron radiation 23(6), 1401 - 1408(2016). doi:10.1107/S1600577516012613 Combining microfluidics with coherent X-ray illumination offers the possibilityto not only measure the structure but also the dynamics of flowing samples in asingle-scattering experiment. Here, the power of this combination is demon-strated by studying the advective and Brownian dynamics of colloidalsuspensions in microflow of different geometries. Using an experimental setupwith a fast two-dimensional detector and performing X-ray correlationspectroscopy by calculating two-dimensional maps of the intensity auto-correlation functions, it was possible to evaluate the sample structure andfurthermore to characterize the detailed flow behavior, including flow geometry,main flow directions, advective flow velocities and diffusive dynamics. Byscanning a microfocused X-ray beam over a microfluidic device, the anisotropicauto-correlation functions of driven colloidal suspensions in straight, curved andconstricted microchannels were mapped with the spatial resolution of the X-raybeam. This method has not only a huge potential for studying flow patternsin complex fluids but also to generally characterize anisotropic dynamicsin materials. Published by IUCr, Chester |
| Databáze: | OpenAIRE |
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