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Open AccessFeature PaperArticle

Calibration Routine for Quantitative Three-Dimensional Flow Field Measurements in Drying Polymer Solutions Subject to Marangoni Convection

Institute of Thermal Process Engineering, Thin Film Technology, Karlsruhe Institute of Technology (KIT), Kaiserstraße, 12, 76131 Karlsruhe, Germany
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Colloids Interfaces 2019, 3(1), 39; https://doi.org/10.3390/colloids3010039
Received: 22 February 2019 / Revised: 6 March 2019 / Accepted: 12 March 2019 / Published: 15 March 2019
(This article belongs to the Special Issue Colloids and Interfaces in Printing Technology)
Surface-tension induced flows may have a significant impact on the surface topography of thin films or small printed structures derived from polymer solution processing. Despite a century of research on Marangoni convection, the community lacks quantitative experimental flow field data, especially from within drying solutions. We utilize multifocal micro particle tracking velocimetry (µPTV) to obtain these data and show a calibration routine based on point spread function (PSF) simulations as well as experimental data. The results account for a varying sample refractive index, beneficial cover-glass correction collar settings as well as a multifocal lens system. Finally, the calibration procedure is utilized exemplarily to reconstruct a three-dimensional, transient flow field within a poly(vinyl acetate)-methanol solution dried with inhomogeneous boundary conditions. View Full-Text
Keywords: micro particle tracking velocimetry; flow field; Marangoni convection; surface deformation; coffee ring effect; film drying; fluorescence microscopy; point spread function micro particle tracking velocimetry; flow field; Marangoni convection; surface deformation; coffee ring effect; film drying; fluorescence microscopy; point spread function
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MDPI and ACS Style

Tönsmann, M.; Kröhl, F.; Cavadini, P.; Scharfer, P.; Schabel, W. Calibration Routine for Quantitative Three-Dimensional Flow Field Measurements in Drying Polymer Solutions Subject to Marangoni Convection. Colloids Interfaces 2019, 3, 39.

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