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Lopez de la Cruz R, Schilder N, Zhang X, Lohse D. Phase Separation of an Evaporating Ternary Solution in a Hele-Shaw Cell. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:10450-10460. [PMID: 34424709 PMCID: PMC8427745 DOI: 10.1021/acs.langmuir.1c01274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 08/10/2021] [Indexed: 06/13/2023]
Abstract
In the present work, we investigate the dynamic phenomena induced by solvent evaporation from ternary solutions confined in a Hele-Shaw cell. The model solutions consist of ethanol, water, and oil, and with the decrease in ethanol concentration by selective evaporation, they may undergo microdroplet formation via the ouzo effect or macroscopic liquid-liquid phase separation. We varied the initial concentration of the three components of the solutions. For all ternary solutions, evaporation of the good solvent ethanol from the gas-liquid interface, aligned with one side of the cell, leads to a Marangoni instability at the early stage of the evaporation process. The presence of the Marangoni instability is in agreement with our recent predictions based on linear stability analysis of binary systems. However, the location and onset of subsequent microdroplet formation and phase separation are the result of the interplay between the Marangoni instability and the initial composition of the ternary mixtures. We classified the ternary solutions into different groups according to the initial concentration of oil. For each group, based on the ternary diagram of the mixture, we offer a rationale for the way phase separation takes place and discuss how the instability influences droplet nucleation. Our work helps us to understand under what conditions and where droplet nucleation can take place when advection is present during phase separation inside a microfluidic device.
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Affiliation(s)
- Ricardo
Arturo Lopez de la Cruz
- Physics
of Fluids Group, Max-Planck-Center Twente for Complex Fluid Dynamics,
Mesa+ Institute, and J. M. Burgers Centre for Fluid Dynamics, Faculty
of Science and Technology, University of
Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Noor Schilder
- Physics
of Fluids Group, Max-Planck-Center Twente for Complex Fluid Dynamics,
Mesa+ Institute, and J. M. Burgers Centre for Fluid Dynamics, Faculty
of Science and Technology, University of
Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Xuehua Zhang
- Physics
of Fluids Group, Max-Planck-Center Twente for Complex Fluid Dynamics,
Mesa+ Institute, and J. M. Burgers Centre for Fluid Dynamics, Faculty
of Science and Technology, University of
Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
- Department
of Chemical and Materials Engineering, University
of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Detlef Lohse
- Physics
of Fluids Group, Max-Planck-Center Twente for Complex Fluid Dynamics,
Mesa+ Institute, and J. M. Burgers Centre for Fluid Dynamics, Faculty
of Science and Technology, University of
Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
- Max
Planck Institute for Dynamics and Self-Organization, Am Faßberg 17, 37077 Göttingen, Germany
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Schwarzenberger K, Köllner T, Linde H, Boeck T, Odenbach S, Eckert K. Pattern formation and mass transfer under stationary solutal Marangoni instability. Adv Colloid Interface Sci 2014; 206:344-71. [PMID: 24456800 DOI: 10.1016/j.cis.2013.10.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Accepted: 10/03/2013] [Indexed: 10/26/2022]
Abstract
According to the seminal theory by Sternling and Scriven, solutal Marangoni convection during mass transfer of surface-active solutes may occur as either oscillatory or stationary instability. With strong support of Manuel G. Velarde, a combined initiative of experimental works, in particular to mention those of Linde, Wierschem and coworkers, and theory has enabled a classification of dominant wave types of the oscillatory mode and their interactions. In this way a rather comprehensive understanding of the nonlinear evolution of the oscillatory instability could be achieved. A comparably advanced state-of-the-art with respect to the stationary counterpart seemed to be out of reach a short time ago. Recent developments on both the numerical and experimental side, in combination with assessing an extensive number of older experiments, now allow one to draw a more unified picture. By reviewing these works, we show that three main building blocks exist during the nonlinear evolution: roll cells, relaxation oscillations and relaxation oscillations waves. What is frequently called interfacial turbulence results from the interaction between these partly coexisting basic patterns which may additionally occur in different hierarchy levels. The second focus of this review lies on the practical importance of such convection patterns concerning their influence on mass transfer characteristics. Particular attention is paid here to the interaction between Marangoni and buoyancy effects which frequently complicates the pattern formation even more. To shed more light on these dependencies, new simulations regarding the limiting case of stabilizing density stratification and vanishing buoyancy are incorporated.
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Sawistowski H. Surface-tension-induced interfacial convection and its effect on rates of mass transfer. CHEM-ING-TECH 1973. [DOI: 10.1002/cite.330451802] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Seto P, Johnson AI, Hamielec AE, Furter WF. Experimental studies of interphase mass transfer with chemical reaction - Saponification of esters. CAN J CHEM ENG 1971. [DOI: 10.1002/cjce.5450490210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Berg JC, Acrivos A, Boudart M. Evaporative Convection. ACTA ACUST UNITED AC 1966. [DOI: 10.1016/s0065-2377(08)60274-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
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