Diffractive imaging for periodic samples: Retrieving one-dimensional concentration profiles across microfluidic channels

Oliver Bunk, Ana Diaz, Franz Pfeiffer, Christian David, Bernd Schmitt, Dillip K. Satapathy, J. Friso Van Der Veen

Research output: Contribution to journalArticlepeer-review

102 Scopus citations

Abstract

A technique has been developed that allows determination of the concentration profiles of colloidal solutions or any kind of fluid under confinement. Currently, submicrometre-wide channels are sampled with a resolution in the 10 nm range. The method comprises regular arrays of microfluidic channels and one-dimensional X-ray phase-retrieval techniques for the analysis of small-angle X-ray diffraction from the array structures. Recording the X-ray diffraction data requires a low dose on each individual channel since the sum of the signals from all channels is detected. The determined concentration profiles represent the ensemble average rather than individual entities and are obtained in a model-independent way. As an example, amplitude and phase of the exit field and concentration profiles for a colloidal fluid within confining channels of different widths are shown.

Original languageEnglish
Pages (from-to)306-314
Number of pages9
JournalActa Crystallographica Section A
Volume63
Issue number4
DOIs
StatePublished - 15 Jun 2007
Externally publishedYes

Keywords

  • Concentration profiles
  • Diffractive imaging
  • Microfluidic channels

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