Dynamic x-ray optics with microfluidics: stabilization of gas bubbles by surface ordering and freezing / Yasutaka Iwashita in La Houille blanche, N° 6 (2009)  

Public ISBD [article]  inLa Houille blanche > N° 6 (2009) . - pp. 129-134 Titre : Dynamic x-ray optics with microfluidics: stabilization of gas bubbles by surface ordering and freezing Titre original : Optique dynamique RX avec des microfluides: stabilisation des bulles de gaz par arrangement et réfrigération de surface Type de document : texte imprimé Auteurs : Yasutaka Iwashita, Auteur ; Christian Bahr, Auteur ; Craig Priest, Auteur Article en page(s) : pp. 129-134 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Microfluidique Bulles Gaz Index. décimale : 551.4 surface du globe.Géographie physique.Géomorphologie Résumé : 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. DEWEY : 553.7 ISSN : 0018-6368 En ligne : http://www.shf-lhb.org/index.php?option=article&access=standard&Itemid=129&url=/ [...] [article] 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 [texte imprimé] / Yasutaka Iwashita, Auteur ; Christian Bahr, Auteur ; Craig Priest, Auteur . - pp. 129-134. Hydraulique Langues : Anglais (eng) in La Houille blanche > N° 6 (2009) . - pp. 129-134 Mots-clés : Microfluidique Bulles Gaz Index. décimale : 551.4 surface du globe.Géographie physique.Géomorphologie Résumé : 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. DEWEY : 553.7 ISSN : 0018-6368 En ligne : http://www.shf-lhb.org/index.php?option=article&access=standard&Itemid=129&url=/ [...]

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