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Investigating nucleation and growth phenomena in microfluidic supercritical antisolvent process by coupling in situ fluorescence spectroscopy and direct numerical simulation

Abstract : High-pressure microfluidic systems exhibit favorable capacity to enhance mixing quality compared to conventional macroscale liquid systems. These mixing conditions are very interesting for the preparation of fluorescent organic nanoparticles by supercritical antisolvent process. In this work, fundamental mechanisms of microfluidic supercritical antisolvent process (µSAS) including thermodynamics, hydrodynamics, nucleation/growth phenomena, are investigated using a coupled experimental/simulation approach. Specifically, we determined experimentally the particle precipitation field in a CO2 / solvent medium using a fluorescent organic dye molecule which presents an enhancement of fluorescence intensity in its aggregated state (AIE effect). The results of the direct numerical simulation considering all the physical phenomena are compared with the experimental data for validation and deep understanding of the mechanisms. It is shown that despite ultra-short mixing time, the supersaturation field showed some fluctuation leading to variation of the nucleation times.
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https://hal.archives-ouvertes.fr/hal-03436269
Contributor : Stéphane Toulin Connect in order to contact the contributor
Submitted on : Tuesday, November 23, 2021 - 4:16:46 PM
Last modification on : Tuesday, January 4, 2022 - 6:17:59 AM

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Thomas Jaouhari, Samuel Marre, Thierry Tassaing, Suzanne Fery-Forgues, Cyril Aymonier, et al.. Investigating nucleation and growth phenomena in microfluidic supercritical antisolvent process by coupling in situ fluorescence spectroscopy and direct numerical simulation. Chemical Engineering Science, Elsevier, 2022, 248 (Part B), 117240 (11 p.). ⟨10.1016/j.ces.2021.117240⟩. ⟨hal-03436269⟩

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