Dresden 2020 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 45: Microfluidics (joint session DY/CPP)

DY 45.3: Talk

Wednesday, March 18, 2020, 17:30–17:45, ZEU 147

Digital magnetofluidics with planar Hall effect sensors — •Julian Schütt¹, Rico Illing¹, Oleksii Volkov¹, Tobias Kosub¹, Pablo Granell^1,2, Hariharan Nhalil³, Jürgen Fassbender¹, Lior Klein³, Asaf Grosz⁴, and Denys Makarov¹ — ¹Helmholtz-Zentrum Dresden-Rossendorf e.V., 01328 Dresden, Germany — ²Escuela de Ciencia y Tecnología, UNSAM, Buenos Aires, Argentina — ³Department of Physics & Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Israel — ⁴Department of Electrical and Computer Engineering, Ben-Gurion University of the Negev, Israel

The detection of magnetic nanoparticles is of major importance in biomedical and biological applications. Here, the trend goes towards improvements of state-of-the-art methods in the spirit of high-throughput analysis at ultra-low volumes. Microfluidics addresses these requirements as it deals with the control and manipulation of liquids in confined microchannels. Sensor elements utilizing the planar Hall Effect (PHE) are exceptionally suited for this conjunction and were already applied in continuous flow microfluidics. We present a sensing strategy relying on PHE sensors in digital microfluidics for the detection of a multiphase liquid flow. We show the detection of nanoliter-sized superparamagnetic droplets with a concentration of 0.58mg/cm3, biased in a geomagnetic field, down to 0.04mg/cm3 in a magnetic field of 5mT. We are convinced that the tracking of microfluidic droplets can greatly contribute to state-of-the-art magnetoresistive sensing with dramatic downscaling of the analyzed volume.