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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:20260523T152713Z
UID:indico-contribution-91-495@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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SUMMARY:Contr. Talk 10 - Orientation distribution of cellulose nanofibrils
  and nanocrystals in channel flow
DTSTART;VALUE=DATE-TIME:20181211T143000Z
DTEND;VALUE=DATE-TIME:20181211T145000Z
DTSTAMP;VALUE=DATE-TIME:20260523T152713Z
UID:indico-contribution-91-494@lindico453.srv.lu.se
DESCRIPTION:Speakers: Tomas Rosen (Stony Brook University)\nNature has a r
 emarkable way of creating complex hierarchical nanostructures of cellulose
  nanofibrils (CNF) into various forms of trees and plants. Depending on lo
 cal environment\, evolution has tailored these structures over millions of
  years to enhance the particular species’ chances of survival. Learning 
 from nature\, we explore the possibility to tailor the properties of cellu
 lose materials materials to suit our needs by hydrodynamically aligning th
 e CNF and assembling them through controlled gelation and subsequent dryin
 g. The orientation distribution of CNF will depend on various parameters i
 ncluding flow properties such as deformation state (e.g. shear and extensi
 on) and flow rates as well as CNF properties such as fibril length distrib
 ution and concentration. In this work\, we study the orientation of CNF an
 d cellulose nanocrystals (CNC) in the shear layers of a channel flow using
  small angle X-ray scattering. The results are compared with simulations o
 f dilute anisotropic Brownian particles. Furthermore\, we demonstrate how 
 polarized microscopy can be used to estimate the orientation distribution 
 of these birefringent dispersions in the channel as well as determine thei
 r rotary diffusion rates. The results greatly enhance our understanding of
  CNF dynamics in flows\, which in turn can lead to new strategies in contr
 olling the structure of nanofibrous materials.\n\nhttps://lindico453.srv.l
 u.se/event/67/contributions/494/
LOCATION:Elite Hotel Ideon Tera
URL:https://lindico453.srv.lu.se/event/67/contributions/494/
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