Jun 13 – 19, 2015
University of Alberta
America/Edmonton timezone
Welcome to the 2015 CAP Congress! / Bienvenue au congrès de l'ACP 2015!

Measuring flow and yielding with coherent x-rays

Jun 17, 2015, 1:45 PM
CAB 235 (University of Alberta)

CAB 235

University of Alberta

Invited Speaker / Conférencier invité Medical and Biological Physics / Physique médicale et biologique (DMBP-DPMB) W2-11 Microfluidics and Driven Motion (DMBP) / Microfluidique et mouvement forcé (DPMB)


Michael Rogers (University of Ottawa)


When coherent radiation is scattered by particles, its scattering pattern is modulated by *speckle*. If the scattering particles move, the speckle will change accordingly. This principle forms the basis of XPCS (X-ray photon correlation spectroscopy), which utilizes bright, coherent X-rays to probe nanoscale particle motion. We will discuss our recent efforts to extend XPCS in two different directions: the measurement of fluid flow, and the yielding of colloidal gels. The flow technique involves measuring scattering particle motion in pressure-driven microchannel flow. Our yielding experiments involve in situ measurements of nanocolloidal gels subjected to oscillatory shear strain, which provides information about the spatial character of particle rearrangements during yielding at the nanometer scale.

Primary author

Michael Rogers (University of Ottawa)

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