Droplet Microfluidics for the Label‐Free Extraction of Complete Phase Diagrams and Kinetics of Liquid–Liquid Phase Separation in Finite Volumes. Issue 46 (30th September 2022)

• Record Type: Journal Article
• Authors: Villois, Alessia; Capasso Palmiero, Umberto; Mathur, Prerit; Perone, Gaia; Schneider, Timo; Li, Lunna; Salvalaglio, Matteo; deMello, Andrew; Stavrakis, Stavros; Arosio, Paolo
• Is Part Of: Small. Volume 18:Issue 46(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-09-30
• Subjects: complete phase diagrams -- finite volumes -- kinetics -- liquid–liquid phase separation -- microfluidics -- polymers and proteins -- thermodynamics; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202202606
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: Liquid–liquid phase separation of polymer and protein solutions is central in many areas of biology and material sciences. Here, an experimental and theoretical framework is provided to investigate the thermodynamics and kinetics of liquid–liquid phase separation in volumes comparable to cells. The strategy leverages droplet microfluidics to accurately measure the volume of the dense phase generated by liquid–liquid phase separation of solutions confined in micro‐sized compartments. It is shown that the measurement of the volume fraction of the dense phase at different temperatures allows the evaluation of the binodal lines that determine the coexistence region of the two phases in the temperature‐concentration phase diagram. By applying a thermodynamic model of phase separation in finite volumes, it is further shown that the platform can predict and validate kinetic barriers associated with the formation of a dense droplet in a parent dilute phase, therefore connecting thermodynamics and kinetics of liquid–liquid phase separation. Abstract : A microfluidic device is developed to extract complete phase diagrams and kinetics of liquid–liquid phase separation in finite volumes. The strategy leverages droplet microfluidics to accurately measure the volume of the dense phase generated by liquid–liquid phase separation of polymer and protein solutions confined in micro‐sized compartments.