Phase Equilibrium and Interfacial Tension of Binary and Ternary Polymer Solutions

Choi, Ji Su; Bae, Young Chan

doi:10.1021/acs.jced.6b00573

“…The crucial effect of temperature on the interfacial tension is typical for solutions with an UCST and has been reported in a number of liquid-liquid systems, including cyclohexane/ aniline, 46 MeOH/n-hexane, 47 and in polystyrene/ cyclohexane. 48 According to our findings of molecular composition being the dominant factor for the interfacial tension, a solution with a LCST is expected to exhibit an inverse scaling with temperature. This is the case of the binary system 2,6-lutidine and water (LCST 34.1°C), for which the reported interfacial tension increased from 0.007 mN m −1 at 34.2°C to 0.8 mN m −1 at 60°C.…”

Section: Temperature Driven Phase Separation In Microchannelsmentioning

confidence: 84%

“…The mixing and separation behaviour observed in 5CB/MeOH and 2,6-lutidine/water allows to anticipate the microfluidic properties of a wide variety of other liquid mixtures that exhibit a UCST or a LCST. Examples of such binary blends are cyclohexane/ aniline, 46 methanol/n-hexane, 47 polystyrene/cyclohexane, 48 polyacrylamide/water, polyĲacrylamide-co-acrylonitrile)/water, 51 BMIMBF 4 /water, 52 OMIMBF 4 /aliphatic and aromatic hydrocarbons, 53 ionic liquids/alcohols, 54 n-propyl-tri-nbutylammonium iodide/water 55 as well as polymer ionic liquids with imidazolyl groups/water. 56…”

Section: Active Flow Pattern Tuningmentioning

confidence: 99%

Microfluidics of binary liquid mixtures with temperature-dependent miscibility

Fornerod

¹

,

Amstad

²

,

Guldin

³

2020

Mol. Syst. Des. Eng.

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Liquid-liquid microfluidic systems rely on the intricate control over the fluid properties of either miscible or immiscible mixtures. Herein, we report on the use of partially miscible binary liquid mixtures that lend their microfluidic properties from a highly temperature-sensitive mixing and phase separation behaviour. For a blend composed of the thermotropic liquid crystal 4-cyano-4′-pentylbiphenyl (5CB) and methanol, mixing at temperatures above the upper critical solution temperature (UCST; 24.4°C) leads to a uniform single phase while partial mixing can be achieved at temperatures below the UCST. Thermally-driven phase separation inside the microfluidic channels results in the spontaneous formation of very regular phase arrangements, namely in droplets, plug, slug and annular flow. We map different flow regimes and relate findings to the role of interfacial tension and viscosity and their temperature dependence. Importantly, different flow regimes can be achieved at constant channel architecture and flow rate by varying the temperature of the blend. A consistent behaviour is observed for a binary liquid mixture with lower critical solution temperature, namely 2,6-lutidine and water. This temperature-responsive approach to microfluidics is an interesting candidate for multi-stage processes, selective extraction and sensing applications.358 | Mol. Syst. Des. Eng., 2020, 5, 358-365 This journal isMicrofluidic processes generally rely on the handling of either miscible or immiscible liquid mixtures. In this work, we introduce a novel temperaturebased microfluidic concept that is driven by and engineered through the underlying molecular characteristics rather than active or passive components on the microchannel architecture. We demonstrate how the temperature-dependent properties of regular solutions, namely miscibility, interfacial tension and viscosity, enable the detailed control over mixing and the formation of highly regular flow patterns. Such systems allow seamless switching between mixed and phase separated states in distinct flow regimes, thus offering novel routes for complex multi-stage processes, selective extraction and sensing applications.

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“…The mixing and separation behaviour observed in 5CB/MeOH and 2,6-lutidine/water allows to anticipate the microfluidic properties of a wide variety of other liquid mixtures that exhibit a UCST or a LCST. Examples of such binary blends are cyclohexane/ aniline, 46 methanol/n-hexane, 47 polystyrene/cyclohexane, 48 polyacrylamide/water, polyĲacrylamide-co-acrylonitrile)/water, 51 BMIMBF 4 /water, 52 OMIMBF 4 /aliphatic and aromatic hydrocarbons, 53 ionic liquids/alcohols, 54 n-propyl-tri-nbutylammonium iodide/water 55 as well as polymer ionic liquids with imidazolyl groups/water. 56…”

Section: Active Flow Pattern Tuningmentioning

confidence: 99%

Microfluidics of Binary Liquid Mixtures with Temperature-Dependent Miscibility

Fornerod¹,

Amstad²,

Guldin³

2019

Preprint

0

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Liquid-liquid microfluidic systems rely on the intricate control over the fluid properties of either miscible or immiscible mixtures. Herein, we report on the use of partially miscible binary liquid mixtures that lend their microfluidic properties from a highly temperature-sensitive mixing and phase separation behaviour. For a blend composed of the thermotropic liquid crystal 4-Cyano-4'-pentylbiphenyl (5CB) and methanol, mixing at temperatures above the upper critical solution temperature (UCST; 24.4°C) leads to a uniform single phase while partial mixing can be achieved at temperatures below the UCST. Thermally-driven phase separation inside the microfluidic channels results in the spontaneous formation of very regular phase arrangements, namely in droplets, plug, slug and annular flow. We map different flow regimes and relate findings to the role of interfacial tension and viscosity and their temperature dependence. Importantly, different flow regimes can be achieved at constant channel architecture and flow rate by varying the temperature of the blend. A consistent behaviour is observed for a binary liquid mixture with lower critical solution temperature, namely 2,6-lutidine and water. This temperature-responsive approach to microfluidics is an interesting candidate for multi-stage processes, selective extraction and sensing applications.

show abstract

“…The mixing and separation behaviour observed in 5CB/MeOH and 2,6-lutidine/water allows to anticipate the microfluidic properties of a wide variety of other liquid mixtures that exhibit a UCST or a LCST. Examples of such binary blends are cyclohexane/ aniline, 46 methanol/n-hexane, 47 polystyrene/cyclohexane, 48 polyacrylamide/water, polyĲacrylamide-co-acrylonitrile)/water, 51 BMIMBF 4 /water, 52 OMIMBF 4 /aliphatic and aromatic hydrocarbons, 53 ionic liquids/alcohols, 54 n-propyl-tri-nbutylammonium iodide/water 55 as well as polymer ionic liquids with imidazolyl groups/water. 56…”

Section: Active Flow Pattern Tuningmentioning

confidence: 99%

Microfluidics of Binary Liquid Mixtures with Temperature-Dependent Miscibility

Fornerod¹,

Amstad²,

Guldin

³

2019

Preprint

0

View full text Add to dashboard Cite

Liquid-liquid microfluidic systems rely on the intricate control over the fluid properties of either miscible or immiscible mixtures. Herein, we report on the use of partially miscible binary liquid mixtures that lend their microfluidic properties from a highly temperature-sensitive mixing and phase separation behaviour. For a blend composed of the thermotropic liquid crystal 4-Cyano-4'-pentylbiphenyl (5CB) and methanol, mixing at temperatures above the upper critical solution temperature (UCST; 24.4°C) leads to a uniform single phase while partial mixing can be achieved at temperatures below the UCST. Thermally-driven phase separation inside the microfluidic channels results in the spontaneous formation of very regular phase arrangements, namely in droplets, plug, slug and annular flow. We map different flow regimes and relate findings to the role of interfacial tension and viscosity and their temperature dependence. Importantly, different flow regimes can be achieved at constant channel architecture and flow rate by varying the temperature of the blend. A consistent behaviour is observed for a binary liquid mixture with lower critical solution temperature, namely 2,6-lutidine and water. This temperature-responsive approach to microfluidics is an interesting candidate for multi-stage processes, selective extraction and sensing applications.

show abstract

Phase Equilibrium and Interfacial Tension of Binary and Ternary Polymer Solutions

Cited by 23 publications

References 32 publications

Microfluidics of binary liquid mixtures with temperature-dependent miscibility

Microfluidics of binary liquid mixtures with temperature-dependent miscibility

Microfluidics of Binary Liquid Mixtures with Temperature-Dependent Miscibility

Microfluidics of Binary Liquid Mixtures with Temperature-Dependent Miscibility

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