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Microfluidic In-Situ Measurement of Poisson’s Ratio of Hydrogels

Laboratoire PMMH-ESPCI Paris, PSL Research University, Sorbonne Université, Université de Paris, 10, rue Vauquelin, F-75005 Paris, France
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Micromachines 2020, 11(3), 318; https://doi.org/10.3390/mi11030318 (registering DOI)
Received: 21 February 2020 / Revised: 13 March 2020 / Accepted: 16 March 2020 / Published: 19 March 2020
(This article belongs to the Special Issue Rheology and Complex Fluid Flows in Microfluidics)
Being able to precisely characterize the mechanical properties of soft microparticles is essential for numerous situations, from the understanding of the flow of biological fluids to the development of soft micro-robots. Here, we present a simple measurement technique for determining Poisson’s ratio of soft micron-sized hydrogels in the presence of a surrounding liquid. This method relies on the measurement of the deformation, in two orthogonal directions, of a rectangular hydrogel slab compressed uni-axially inside a microfluidic channel. Due to the in situ character of the method, the sample does not need to be dried, allowing for the measurement of the mechanical properties of swollen hydrogels. Using this method, we determined Poisson’s ratio of hydrogel particles composed of polyethylene glycol (PEG) and varying solvents fabricated using a lithography technique. The results demonstrate, with high precision, the dependence of the hydrogel compressibility on the solvent fraction and character. The method is easy to implement and can be adapted for the measurement of a variety of soft and biological materials. View Full-Text
Keywords: Poisson’s ratio; hydrogels; microfluidics; PEG-DA; rheology Poisson’s ratio; hydrogels; microfluidics; PEG-DA; rheology
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MDPI and ACS Style

Cappello, J.; d’Herbemont, V.; Lindner, A.; du Roure, O. Microfluidic In-Situ Measurement of Poisson’s Ratio of Hydrogels. Micromachines 2020, 11, 318.

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