Regensburg 2025 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 23: Poster: Active Matter, Soft Matter, Fluids (joint session DY/CPP)
DY 23.15: Poster
Mittwoch, 19. März 2025, 10:00–12:00, P3
Thermo-Osmotic Flows via Anti-Stokes Cooling — •akshay kallikkunnath1, kamil bruchal2, pawel karpinski2, and frank cichos1 — 1Molecular Nanophotonics, Peter Debye Institute for Soft Matter Physics, Faculty of Physics and Earth System Sciences, Leipzig University, Germany — 2Faculty of Chemistry, Institute of Advanced Materials, Wroclaw University of Science and Technology, Poland
Fluidic manipulation has gained huge interest over time especially with the studies on metal nanoparticles as optically controlled heat sources generating temperature gradients. With recent developments in the synthesis of lanthanide doped crystals which can be cooled by anti- stokes cooling, we try to bring laser cooling of microcrystals to the field of fluidics. In this work, we optically trap and cool ytterbium doped NaYF4 crystals by means of anti-stokes cooling. Temperature measurements for such microscale cooled crystals are done using a technique which utilizes the phase transition of liquid crystals. With such a thermal gradient created using cold sinks in liquid, we study and provide for the first time experimental and numerical results for flows generated at solid-liquid boundary, i.e., thermo-osmotic flows. The results will provide further scope for studying dipolar thermo-osmotic and corresponding thermo-electric fields in an electrolyte solution generated by arranging optically heated and cooled particles together. Our findings can have direct implications on the study of temperature-dependent biochemical processes which inhibit with lower temperature or on response of a biological specimen to low temperature stress or may even find application in local cryotherapy.
Keywords: Anti-stokes cooling; Thermo-osmotic flows; Fluid manipulation