La Houille Blanche
Number 6, Décembre 2009
|Page(s)||129 - 134|
|Section||Microfluidique: Microflu'08 – 1er congrès européen de Microfluidique|
|Published online||13 January 2010|
Dynamic x-ray optics with microfluidics: stabilization of gas bubbles by surface ordering and freezing
Optique dynamique RX avec des microfluides: Stabilisation des bulles de gaz par arrangement et réfrigération de surface
Max Planck Institute for Dynamics and Self-Organization, 37073 Goettingen, Germany
2 Ian Wark Research Institute, University of South Australia, South Australia 5095, Australia
3 Max Planck Institute for Dynamics and Self-Organization, 37073 Goettingen, Germany Experimental Physics, Saarland University, 66041 Saarbruecken, Germany
Compound refractive lenses (CRL), which are composed of many lenses aligned along the optical axis, have been developed as refractive x-ray optics. A CRL has numerous desired properties: It is robust, easy to align and to operate, and can be used for hard x-rays. To broaden the possibilities and functions of static CRL, we propose a "dynamic CRL", which is composed of continuously renewed gas bubbles in a surrounding liquid phase flowing along a thin capillary. Due to the continuous renewal, this system is expected to have a high stability against high x-ray intensities. Furthermore, the variation of the bubble volume and bubble shape by adjusting the flow parameters allows in-situ optimization of the optical properties of the system, i.e. the focal length. Here, we study the usage of liquid crystals and n-alkanes to be used in dynamic CRL's. These liquids have a very low x-ray absorption and the liquid - gas systems can be stabilized without surfactants using the surface ordering of liquid crystals respectively the surface freezing of n-alkanes
© Société Hydrotechnique de France, 2009
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