Ultrasonic absorption in binary liquid systems near the critical solution temperature

1953 ◽  
Vol 15 ◽  
pp. 218 ◽  
Author(s):  
G. F. Alfrey ◽  
W. G. Schneider
Keyword(s):  
Solution Temperature ◽  
Ultrasonic Absorption ◽  
Critical Solution Temperature ◽  
Binary Liquid ◽  
Liquid Systems

Partially miscible liquid systems: The density, change of volume on mixing, vapor pressure, surface tension, and viscosity in the system: aniline–hexane

1968 ◽  
Vol 46 (14) ◽  
pp. 2399-2407 ◽  
Author(s):  
A. N. Campbell ◽  
E. M. Kartzmark ◽  
S. C. Anand ◽  
Y. Cheng ◽  
H. P. Dzikowski ◽  
...  
Keyword(s):  
Surface Tension ◽  
Vapor Pressure ◽  
Chemical Potential ◽  
Density Change ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Pressure Surface ◽  
Anomalous Viscosity ◽  
Tension Properties ◽  
Liquid Systems

The following properties have been investigated experimentally: density, change of volume on mixing, vapor pressure, surface tension, and viscosity, at temperatures above and below the critical solution temperature. The question at issue is: How does the chemical potential, or any property dependent on chemical potential, change, at constant temperature, over a range of composition, just above the critical solution temperature? In the present case, the vapor pressure and surface tension, properties directly dependent on chemical potential, are constant within the range of experimental accuracy (which, however, may not be sufficient) over a range of concentration. The viscosity is complicated by the occurrence of anomalous viscosity. The change of volume on mixing is negative, and this is usually associated with compound formation. In all other systems investigated by us, except the system triethylamine–water, ΔV is positive. We have shown elsewhere, however, that a very stable chemical compound is formed between water and triethylamine.

ULTRASONIC ABSORPTION IN CRITICAL BINARY LIQUID SYSTEMS. II

1964 ◽  
Vol 42 (7) ◽  
pp. 1712-1717 ◽  
Author(s):  
Peeter Kruus
Keyword(s):  
Scattering Data ◽  
Ultrasonic Absorption ◽  
Reflection Method ◽  
Absorption Data ◽  
Correlation Lengths ◽  
Binary Liquid ◽  
Liquid Systems ◽  
Solution Region ◽  
Two Phases ◽  
Absorption Measurements

The results of ultrasonic absorption measurements for the systems perfluoromethylcyclohexane – carbon tetrachloride and triethylamine–water are presented. A pulse reflection method was used for the measurements. Intermolecular correlation lengths were calculated from the absorption data for these and two other systems. They are in reasonable agreement with lengths calculated from light scattering data. The absorption results also substantiate the suggestion that, in the critical solution region, the system may already be in two phases. However, these are not present in the form of two distinctly separated phases, but as regions in a type of emulsion.

scholarly journals Microfluidics of Binary Liquid Mixtures with Temperature-Dependent Miscibility

2019 ◽  
Author(s):  
Maximiliano J. Fornerod ◽  
Esther Amstad ◽  
Stefan Guldin
Keyword(s):  
Phase Separation ◽  
Flow Regimes ◽  
Liquid Mixtures ◽  
Binary Liquid Mixtures ◽  
Solution Temperature ◽  
Microfluidic Channels ◽  
Temperature Sensitive ◽  
Critical Solution Temperature ◽  
Binary Liquid ◽  
Sensing Applications

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.

scholarly journals Temperature-Induced Liquid Crystal Microdroplet Formation in a Partially Miscible Liquid Mixture

2019 ◽  
Author(s):  
Mehzabin Patel ◽  
Anand N. Pallipurath Radhakrishnan ◽  
Ludovic Bescher ◽  
Elwin Hunter-Sellars ◽  
Benjamin Schmidt-Hansberg ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Mixture ◽  
Liquid Mixtures ◽  
Solution Temperature ◽  
Material System ◽  
Reversible Process ◽  
Critical Solution Temperature ◽  
Binary Liquid ◽  
Partially Miscible ◽  
Extraction Processes

The controlled formation of microdroplets through temperature variation is an intriguing concept for binary liquid mixtures with a critical solution temperature. Here, we investigate this phenomenon for a blend of methanol (MeOH) and a thermotropic liquid crystal (LC) 4-Cyano-4’-pentylbiphenyl (5CB). A near-room-temperatureinduced phase separation leads to nucleation, growth and coalescence of mesogen-rich droplets. The size and number of the droplets is tunable on the microscopic scale by variation of temperature quench depth and cooling rate. Further cooling induces a phase transition to nematic droplets with radial configuration, well-defined sizes and stability over the course of an hour. This fully reversible process is an interesting material system with relevance in diagnostics, optoelectronics, materials templating and extraction processes.<br>

scholarly journals Temperature-Induced Liquid Crystal Microdroplet Formation in a Partially Miscible Liquid Mixture

2019 ◽  
Author(s):  
Mehzabin Patel ◽  
Anand N. Pallipurath Radhakrishnan ◽  
Ludovic Bescher ◽  
Elwin Hunter-Sellars ◽  
Benjamin Schmidt-Hansberg ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Mixture ◽  
Liquid Mixtures ◽  
Solution Temperature ◽  
Material System ◽  
Reversible Process ◽  
Critical Solution Temperature ◽  
Binary Liquid ◽  
Partially Miscible ◽  
Extraction Processes

The controlled formation of microdroplets through temperature variation is an intriguing concept for binary liquid mixtures with a critical solution temperature. Here, we investigate this phenomenon for a blend of methanol (MeOH) and a thermotropic liquid crystal (LC) 4-Cyano-4’-pentylbiphenyl (5CB). A near-room-temperatureinduced phase separation leads to nucleation, growth and coalescence of mesogen-rich droplets. The size and number of the droplets is tunable on the microscopic scale by variation of temperature quench depth and cooling rate. Further cooling induces a phase transition to nematic droplets with radial configuration, well-defined sizes and stability over the course of an hour. This fully reversible process is an interesting material system with relevance in diagnostics, optoelectronics, materials templating and extraction processes.<br>

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