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Size-Based Sorting of Emulsion Droplets in Microfluidic Channels Patterned with Laser-Ablated Guiding Tracks
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SYSNO ASEP 0525111 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Size-Based Sorting of Emulsion Droplets in Microfluidic Channels Patterned with Laser-Ablated Guiding Tracks Author(s) Rehman, A.U. (TR)
Coskun, U.C. (TR)
Rashid, Z. (TR)
Morova, B. (TR)
Jonáš, Alexandr (UPT-D) RID, SAI, ORCID
Erten, A. (TR)
Kiraz, A. (TR)Number of authors 7 Source Title Analytical Chemistry. - : American Chemical Society - ISSN 0003-2700
Roč. 92, č. 3 (2020), s. 2597-2604Number of pages 8 s. Publication form Print - P Language eng - English Country US - United States Keywords emulsion droplets ; size-based sorting ; laser Subject RIV BH - Optics, Masers, Lasers OECD category Optics (including laser optics and quantum optics) Method of publishing Limited access Institutional support UPT-D - RVO:68081731 UT WOS 000511509400034 EID SCOPUS 85079022844 DOI 10.1021/acs.analchem.9b04308 Annotation We demonstrate an autonomous, high-throughput mechanism for sorting of emulsion droplets with different sizes concurrently flowing in a microfluidic Hele-Shaw channel. The aqueous droplets of varying radii suspended in olive oil are separated into different streamlines across the channel upon interaction with a shallow (depth similar to 700 nm) inclined guiding track ablated into the polydimethylsiloxane-coated surface of the channel with focused femtosecond laser pulses. Specifically, the observed differences in the droplet trajectories along the guiding track arise due to the different scaling of the confinement force attracting the droplets into the track, fluid drag, and wall friction, with the droplet radius. In addition, the distance traveled by the droplets along the track also depends on the track width, with wider tracks providing more stable droplet guiding for any given droplet size. We systematically study the influence of the droplet size and velocity on the trajectory of the droplets in the channel and analyze the sensitivity of size-based droplet sorting for varying flow conditions. The droplet guiding and sorting experiments are complemented by modeling of the droplet motion in the channel flow using computational fluid dynamics simulations and a previously developed model of droplet guiding. Finally, we demonstrate a complete separation of droplets produced by fusion of two independent droplet streams at the inlet of the Hele-Shaw channel from unfused daughter droplets. The presented droplet sorting technique can find applications in the development of analytical and preparative microfluidic protocols. Workplace Institute of Scientific Instruments Contact Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Year of Publishing 2021 Electronic address https://pubs.acs.org/doi/abs/10.1021/acs.analchem.9b04308
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