scholarly journals Pressure-induced phase separation of miscible liquids: 1 : 1 n-pentane/iso-pentane

CrystEngComm ◽  
2020 ◽  
Vol 22 (47) ◽  
pp. 8251-8255
Author(s):  
X. Liu ◽  
C. R. Pulham
Keyword(s):  
Phase Separation ◽  
Time Dependent ◽  
Miscible Liquids

We report the unexpected pressure-induced and time-dependent nucleation and crystallisation of n-pentane from a 1 : 1 mixture of n-pentane and iso-pentane.

Microstructure development in furfuryl resin-derived microporous glassy carbons

1996 ◽  
Vol 11 (9) ◽  
pp. 2338-2345 ◽  
Author(s):  
Kristen Persels Constant ◽  
Jonq-Ren Lee ◽  
Yet-Ming Chiang
Keyword(s):  
Phase Separation ◽  
Ethylene Glycol ◽  
Glassy Carbon ◽  
Thermal History ◽  
Liquid State ◽  
Furfuryl Alcohol ◽  
Time Dependent ◽  
Miscibility Gap ◽  
Microstructure Development

The processing of microporous glassy carbon derived from furfuryl alcohol and ethylene glycol mixtures has been studied, with emphasis on understanding and controlling microstructure development. It is shown that this system exhibits a polymerization-dependent miscibility gap, and that the carbon microstructure is determined by phase separation in the liquid state. Variations in carbon microstructure with composition and thermal history can be understood in terms of the time-dependent immiscibility and resulting phase separation.

scholarly journals Time dependent effects and transport evidence for phase separation in La0.5Ca0.5MnO3

2000 ◽  
Vol 87 (9) ◽  
pp. 5831-5833 ◽  
Author(s):  
M. Roy ◽  
J. F. Mitchell ◽  
P. Schiffer
Keyword(s):  
Phase Separation ◽  
Time Dependent

Time dependent light scattering studies of phase separation in polymer blends

1983 ◽  
Vol 78 (6) ◽  
pp. 3334-3336 ◽  
Author(s):  
H. L. Snyder ◽  
Paul Meakin ◽  
S. Reich
Keyword(s):  
Phase Separation ◽  
Light Scattering ◽  
Polymer Blends ◽  
Time Dependent

scholarly journals Phase-separation of miscible liquids in a centrifuge

2007 ◽  
Vol 8 (7-8) ◽  
pp. 955-960 ◽  
Author(s):  
Yoav Tsori ◽  
Ludwik Leibler
Keyword(s):  
Phase Separation ◽  
Miscible Liquids

scholarly journals Emulsion patterns in the wake of a liquid–liquid phase separation front

2018 ◽  
Vol 115 (14) ◽  
pp. 3599-3604 ◽  
Author(s):  
Pepijn G. Moerman ◽  
Pierre C. Hohenberg ◽  
Eric Vanden-Eijnden ◽  
Jasna Brujic
Keyword(s):  
Phase Separation ◽  
Liquid Phase ◽  
Large Scale ◽  
Scaling Law ◽  
Liquid Phase Separation ◽  
Scale Free ◽  
Transport Control ◽  
Droplet Sizes ◽  
Miscible Liquids ◽  
Liquid Liquid Phase Separation

Miscible liquids can phase separate in response to a composition change. In bulk fluids, the demixing begins on molecular-length scales, which coarsen into macroscopic phases. By contrast, confining a mixture in microfluidic droplets causes sequential phase separation bursts, which self-organize into rings of oil and water to make multilayered emulsions. The spacing in these nonequilibrium patterns is self-similar and scale-free over a range of droplet sizes. We develop a modified Cahn–Hilliard model, in which an immiscibility front with stretched exponential dynamics quantitatively predicts the spacing of the layers. In addition, a scaling law predicts the lifetime of each layer, giving rise to a stepwise release of inner droplets. Analogously, in long rectangular capillaries, a diffusive front yields large-scale oil and water stripes on the time scale of hours. The same theory relates their characteristic length scale to the speed of the front and the rate of mass transport. Control over liquid–liquid phase separation into large-scale patterns finds potential material applications in living cells, encapsulation, particulate design, and surface patterning.

Forced plumes and mixing of liquids in tanks

1975 ◽  
Vol 71 (3) ◽  
pp. 601-623 ◽  
Author(s):  
A. E. Germeles
Keyword(s):  
Mathematical Model ◽  
Numerical Method ◽  
The Other ◽  
Time Dependent ◽  
Local Effects ◽  
Plume Dynamics ◽  
Difference Variable ◽  
Infinite Extent ◽  
Miscible Liquids ◽  
Set Up

We consider the mixing between two miscible liquids of slightly different density (< 10%) when one of them (cargo) is injected into a tank partially filled with the other (inventory). The injection of the cargo is such that buoyancy and inertia act in concert on the plume produced by the cargo. The two basic processes that govern the mixing of the two liquids in the tank are the entrainment of tank liquid by the plume and the tank circulation set up by this entrainment and by the plume discharge. Unlike plumes in an environment of infinite extent, the plume in this case changes its environment continuously, which, in turn, has a continuously-varying effect on the plume. A mathematical model for the mixing of the two liquids is presented, from which one can compute the tank stratification that may result when given amounts of cargo and inventory are thus mixed. Plume entrainment theory is used for the plume dynamics and a ‘filling-box’ model is used for the tank circulation. The partial differential equations of the model are integrated by an original and unique numerical method. The problem was also treated experimentally. The tank stratification is expressed in terms of a normalized density-difference variable δ. Except for some very localized large discrepancies, due to certain local effects not included in the model, computed and experimental profiles of δ agree very well, their maximum and average deviations being within 4 and 2%, respectively. It is found that values of the empirical plume parameters α and λ that are used commonly for steady plumes in environments of infinite extent are approximately right for the time-dependent plumes under consideration too.

Numerical investigation of the growth kinetics for macromolecular microsphere composite hydrogel based on the TDGL equation

2016 ◽  
Vol 15 (08) ◽  
pp. 1650064
Author(s):  
Dating Wu ◽  
Hui Zhang
Keyword(s):  
Phase Separation ◽  
Numerical Investigation ◽  
Growth Kinetics ◽  
Pair Correlation ◽  
Domain Size ◽  
Time Dependent ◽  
Domain Growth ◽  
Ginzburg Landau ◽  
Tdgl Equation ◽  
Kinetics Of

We present results of a detailed numerical investigation of the phase separation kinetic process of the macromolecular microsphere composite (MMC) hydrogel. Based on the Flory-Huggins-de Gennes-like reticular free energy, we use the time-dependent Ginzburg–Landau (TDGL) mesoscopic model (called MMC-TDGL model) to simulate the phase separation process. Domain growth is investigated through the pair correlation function. Then we obtain the time-dependent characteristic domain size, which reflects the growth kinetics of the MMC hydrogel. The results indicate that the growth law based on the MMC-TDGL equation is consistent with the modified Lifshitz–Slyozov theory.

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