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@INPROCEEDINGS{Gottschalk:1034358,
      author       = {Gottschalk, Simon and Lettinga, M.P. and Dahlhoff, Knut and
                      Natour, Ghaleb},
      title        = {{I}ntroduction of {N}ew {R}otational {M}ini-{R}heometer for
                      {S}carce {S}ample},
      reportid     = {FZJ-2024-07141},
      year         = {2024},
      abstract     = {We introduce a miniaturized stress-controlled rheometer,
                      aimed at enhancing rotational rheometry for analysis of
                      scarce sample in material science and product development.
                      This innovative device addresses the critical need for
                      analyzing samples, such as biofilms, nascent drug
                      formulations,and rare metal inks for microelectronics, which
                      are typically limited in quantity due to their high
                      production costs, challenging synthesis, or exclusive
                      origins. Rheological measurements typically require at least
                      20 μl of sample material using commercial rotation
                      rheometer, a requirement significantly reduced by our
                      device. The mini-rheometer, approximately the size of a 50mm
                      cube, utilizes in particular an air bearing rotor made of
                      quartz glass, manufactured via Selective Laser Etching
                      (SLE). This subtractive 3D printing method for glass ensures
                      the precision needed e.g. for air bearing with μm-scale
                      gaps. An outer magnetic field generated by two orthogonal
                      coil pairs drives a centrally-placed magnet. Torque
                      precision is maintained through applied current and the
                      phase angle between inner and outer magnetic fields. The
                      angular displacement is accurately gauged by two Hall effect
                      sensors, that detect the rotational movement of the inner
                      magnet. The mini-rheometer´s efficiency and functionality
                      were tested performing a simple shear stress experiment on
                      silicon reference oil. Notably, the employed cone-plate
                      geometry only requires 2 μl of sample material,
                      representing a significant advancement in sample
                      conservation. This development extends the benefits of
                      rotational rheometry - such as a wide range of strain rates
                      and homogeneous strain profiles - to experiments where
                      sample availability is limited. Due to the device´s
                      miniaturized dimensions common, inverted microscopes could
                      be used to study microstructural properties related to
                      macroscopic flow behavior.},
      month         = {Apr},
      date          = {2024-04-09},
      organization  = {Annual European Rheology Conference
                       2024, Leeds (UK), 9 Apr 2024 - 12 Apr
                       2024},
      subtyp        = {Other},
      cin          = {ZEA-1 / IBI-4 / PGI-SO},
      cid          = {I:(DE-Juel1)ZEA-1-20090406 / I:(DE-Juel1)IBI-4-20200312 /
                      I:(DE-Juel1)PGI-SO-20200511},
      pnm          = {5352 - Understanding the Functionality of Soft Matter and
                      Biomolecular Systems (POF4-535)},
      pid          = {G:(DE-HGF)POF4-5352},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/1034358},
}