Dr. Janine K. Nunes Profile

Dr. Janine K. Nunes

at Princeton Univ

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Proceedings Article | 21 June 2019 Presentation + Paper

Design of an optofluidic device for the measurement of the elastic modulus of deformable particles

Massimiliano Villone, Janine Nunes, Yankai Li, Howard Stone, Pier Luca Maffettone

Proceedings Volume 11060, 110600L (2019) https://doi.org/10.1117/12.2524901

KEYWORDS: Particles, Liquids, Optofluidics, Microfluidics, Measurement devices

Read Abstract +

Suspensions carrying deformable inclusions are ubiquitous in nature and applications. Hence, high-throughput characterization of the mechanical properties of soft particles is of great interest. Recently, a non-invasive optofluidic technique has been developed for the measurement of the interfacial tension between two immiscible liquids.^{1, 2} We adapt such technique to the case of soft solid beads, thus designing a non-invasive optofluidic device for the measurement of the mechanical properties of deformable particles from real-time optical imaging of their deformation. The device consists of a cylindrical microfluidic channel with a cross-section reduction in which we make initially spherical soft beads flow suspended in a Newtonian carrier. By imaging the deformation of a particle in real time while it goes through the constriction, it is possible to get a measure of its elastic modulus through a theoretically derived-correlation. We provide both experimental and numerical validation of our device.

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