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SUMMARY:Contr. Talk 11 - SAXS on a chip: from alignment phenomena at inter
 faces to dynamics of phase transitions studied with microfluidic devices
DTSTART;VALUE=DATE-TIME:20181211T145000Z
DTEND;VALUE=DATE-TIME:20181211T151000Z
DTSTAMP;VALUE=DATE-TIME:20260523T191805Z
UID:indico-contribution-495@lindico453.srv.lu.se
DESCRIPTION:Speakers: Bruno Silva (INL - International Iberian Nanotechnol
 ogy Laboratory)\nThe field of microfluidics offers attractive possibilitie
 s to perform novel experiments that are difficult to execute using convent
 ional methods [1]. First\, the flow of liquids under submillimeter confine
 ment leads to predictable and controllable flow profiles\, along with well
 -defined chemical gradients and stress fields that can be used for control
 led mixing and actuation on the micro and nanoscale. Secondly\, intricate 
 microfluidic device designs can be fabricated to perform complex tasks. Th
 irdly\, microfluidic devices are usually compatible with in situ or integr
 ated characterization methods that allow constant real-time monitoring of 
 the processes occurring inside the microchannels. \nIn this work we will f
 ocus on the use and prospects of combining microfluidic devices with in si
 tu small-angle X-ray scattering (SAXS) for soft matter research. In a firs
 t example\, we use this manipulation ability to create well-defined flowin
 g interfaces to study the interplay between shear-flow forces and the stru
 cture of nematic liquid crystals and surfactant monolayers [2]. In a secon
 d example\, we study the structural evolution of a lamellar phase undergoi
 ng a transition to a microemulsion in the SDS-pentanol-water ternary syste
 m by mixing with water or pentanol in a crossed microchannel configuration
  [3]. By manipulating the individual flow-rates\, one can carefully tune t
 he final composition following the concentration jump\, and furthermore\, 
 probe different time-scales of the transition with SAXS. The main findings
  show that the lamellar to o/w microemulsion transition (by mixing with wa
 ter) occurs through a gradual stripping down of bilayers from the lamellar
  phase\, whereas the lamellar to w/o reverse microemulsion transition (thr
 ough mixing with pentanol) involves the formation of an intermediate lamel
 lar phase.\n\nhttps://lindico453.srv.lu.se/event/67/contributions/495/
LOCATION:Elite Hotel Ideon Tera
URL:https://lindico453.srv.lu.se/event/67/contributions/495/
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