Phase Separation of a Binary Liquid System in Controlled-Pore Glass

2003 ◽  
Vol 790 ◽  
Author(s):  
S. Schemmel ◽  
D. Akcakayiran ◽  
G. Rother ◽  
A. Brulet ◽  
B. Farago ◽  
...  
Keyword(s):  
Phase Separation ◽  
Spin Echo ◽  
Effective Diffusion ◽  
Liquid Mixtures ◽  
Isobutyric Acid ◽  
Liquid System ◽  
Phase Region ◽  
Neutron Spin ◽  
Binary Liquid ◽  
Order Of Magnitude

ABSTRACTThe phase separation behaviour and the dynamics of concentration fluctuations of binary liquid mixtures are strongly influenced by confinement effects. We have investigated this confinement effect for the binary system isobutyric acid iBA + D2O imbibed into a mesoporous silica glass (CPG-10). The dynamics of the mixture are studied in the one-phase region as well as in the phase-separated state by means of neutron spin echo spectroscopy (NSE). Moreover, the averaged structures of the liquid are explored by means of small angle neutron scattering (SANS) leading to a length scale 4 < ξ < 9 nm for the fluctuations. The associated effective diffusion coefficient Deff as obtained for NSE is found to decrease with temperature ny nearly one order of magnitude in the temperature range from 75°C to 25°C.

Diffusion in Binary Nonelectrolyte Solutions

1980 ◽  
Vol 35 (10) ◽  
pp. 1116-1117
Author(s):  
R. Haase ◽  
H.-J. Jansen
Keyword(s):  
Experimental Data ◽  
Diffusion Coefficient ◽  
Ideal Liquid ◽  
Liquid Mixtures ◽  
Liquid System ◽  
Recent Experimental Data ◽  
Thermodynamic Factor ◽  
Binary Liquid ◽  
System Water ◽  
The Ideal

Abstract For binary liquid mixtures of nonelectrolytes, we consider the dependence of the diffusion coefficient on composition and temperature, making use of an analytical expression for the kinematic diffusion coefficient (diffusion coefficient divided by thermodynamic factor). We present recent experimental data for the ideal liquid system chlorobenzene + bromobenzene and for the non-ideal liquid system water -f methanol as well as literature data for other non-ideal mixtures.

Kinetics of phase separation in binary liquid mixtures

1980 ◽  
Vol 84 (15) ◽  
pp. 1991-1995 ◽  
Author(s):  
J. Wenzel ◽  
U. Limbach ◽  
G. Bresonik ◽  
G. M. Schneider
Keyword(s):  
Phase Separation ◽  
Liquid Mixtures ◽  
Binary Liquid Mixtures ◽  
Binary Liquid ◽  
Kinetics Of

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 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.

Sign in / Sign up

Export Citation Format

Share Document