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@INPROCEEDINGS{Afanasenkau:154520,
      author       = {Afanasenkau, Dzmitry and Wiegand, Simone},
      title        = {{T}hermodiffusion of latex beads studied with a
                      microfluidic cell},
      reportid     = {FZJ-2014-03834},
      year         = {2014},
      abstract     = {Investigation of the thermodiffusion requires relatively
                      high temperature gradients. The temperature difference at
                      the same time should be small enough because of the
                      temperature dependence of the effect. This can be achieved
                      by reducing the dimensions of the system. Therefore we
                      developed a microfluidic cell which allows us to observe
                      thermophoresis of colloids in the solution. Unlike many
                      existing optical methods our cell is suitable to study big
                      colloids (up to several micrometers) and complex mixtures.
                      The cell can be also applied for investigation of
                      thermophoretic phenomena in biological systems such as
                      living cell and lipid membranes.Our cell consist of three
                      channels (fig 1A): two relatively big ones for providing
                      high flow rate of hot and cold liquid and a small channel in
                      between them which contains the sample to study. The cell is
                      produced either of PDMS by molding on lithographically made
                      Si/SU-8 master or by micromilling the Plexiglas block with a
                      CNC machine. The central channel is made very flat to
                      prevent convection.To characterize the temperature
                      distribution in our cell we used FLIM [1] with Rhodamine B
                      as a temperature sensitive dye. The temperature distribution
                      in the central channel is shown in fig 1B. The temperature
                      difference across the central channel appeared to be around
                      2°C (the temperature gradient equals 2•104 K/m) although
                      the temperature difference in the cooling and heating
                      channels was much higher (22°C and 47°C respectively)
                      which indicates large temperature drop in the walls.The cell
                      was applied to investigate thermodiffusion of latex
                      microbeads (sulfate modified, 0.5um) in water. The resulting
                      exponential distribution in equilibrium (fig 1C) could be
                      analyzed according to Zhao et al [2]. In order to validate
                      our new method we perform additional measurements with the
                      Thermal Diffusion Forced Rayleigh Scattering setup. Results
                      will be discussed.},
      month         = {Jun},
      date          = {2014-06-02},
      organization  = {The 11th International Meeting on
                       Thermodiffusion, Bayonne (France), 2
                       Jun 2014 - 6 Jun 2014},
      cin          = {ICS-3},
      cid          = {I:(DE-Juel1)ICS-3-20110106},
      pnm          = {451 - Soft Matter Composites (POF2-451)},
      pid          = {G:(DE-HGF)POF2-451},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/154520},
}