Controlling composition of coexisting phases via molecular transitions

Two-phase water-free systems containing high ethanol content in the coexisting phases can selectively partition hydrophobic molecules from natural biomass.

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Effect of long-term ageing on microstructure stability and lattice parameters of coexisting phases in intermetallic Ti–46Al–8Ta alloy

Intermetallics ◽

10.1016/j.intermet.2010.09.016 ◽

2011 ◽

Vol 19 (1) ◽

pp. 121-124 ◽

Cited By ~ 16

Author(s):

J. Lapin ◽

T. Pelachová ◽

V.T. Witusiewicz ◽

E. Dobročka

Keyword(s):

Lattice Parameters ◽

Microstructure Stability ◽

Coexisting Phases

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Prediction of vapour-liquid equilibrium: Theory, computer techniques and application to permanent gas mixtures at pressures in excess of 5 bar

Australian Journal of Chemistry ◽

10.1071/ch9772583 ◽

1977 ◽

Vol 30 (12) ◽

pp. 2583 ◽

Cited By ~ 3

Author(s):

CP Hicks ◽

CL Young

Keyword(s):

Phase Separation ◽

Fluid Model ◽

Gas Mixtures ◽

Liquid Equilibrium ◽

Equal Area ◽

Closed Equation ◽

Coexisting Phases ◽

Temperature And Pressure ◽

Two Parameter ◽

Theory And Experiment

A technique for calculating the composition of two coexisting phases in equilibrium at a given temperature and pressure is described. The method is applicable, in principle, to any one-fluid model and any two- parameter closed equation of state. The philosophy of the technique is similar to that used in previous work on critical points.�� Values of (∂G/∂x2)T,P are calculated for mole fraction compositions ranging from zero to unity in small steps in order to locate (∂G/∂x2)T,P loops. Around each loop there is a region of phase separation and the compositions of coexisting phases are found by the usual equal-area line technique. �� The use of the method is briefly illustrated by comparison with the experimental results for simple gas mixtures. The agreement between theory and experiment is satisfactory.

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The metamorphism of pyrite and pyritic ores: an overview

Mineralogical Magazine ◽

10.1180/minmag.1993.057.386.02 ◽

1993 ◽

Vol 57 (386) ◽

pp. 3-18 ◽

Cited By ~ 116

Author(s):

James R. Craig ◽

Frank M. Vokes

Keyword(s):

Isotope Exchange ◽

Ore Deposits ◽

Sulphur Isotope ◽

Depositional History ◽

Sulphide Minerals ◽

Coexisting Phases

AbstractPyrite, the most widespread and abundant of sulphide minerals in the Earth's surficial rocks, commonly constitutes the primary opaque phase in ore deposits. Consequently, an understanding of the behaviour of pyrite and its relationships with coexisting phases during the metamorphism of pyritebearing rocks is vital to the interpretation of their genesis and post-depositional history. Metamorphism is commonly responsible for the obliteration of primary textures but recent studies have shown that the refractory nature of pyrite allows it to preserve some pre-metamorphic textures. Pyrrhotite in pyritic ores has often been attributed to the breakdown of pyrite during metamorphism. It is now clear that pyrrhotite can be primary and that the presence of pyrrhotite with the pyrite provides a buffer that constrains sulphur activity during metamorphism. Pyrite-pyrrhotite ratios change during metamorphism as prograde heating results in sulphur release from pyrite to form pyrrhotite and as retrograde cooling permits re-growth of pyrite as the pyrrhotite releases sulphur. Retrograde growth of pyrite may encapsulate textures developed during earlier stages as well as preserve evidence of retrograde events. Sulphur isotope exchange of pyrite with pyrrhotite tends to homogenise phases during prograde periods but leaves signatures of increasingly heavy sulphur in the pyrite during retrograde periods.

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Partitioning of Gramicidin A’ Between Coexisting Phases within Phospholipid Bilayers

Cell and Model Membrane Interactions ◽

10.1007/978-1-4615-3854-7_2 ◽

1991 ◽

pp. 15-24

Author(s):

Andrew R. G. Dibble ◽

Mark D. Yeager ◽

Gerald W. Feigenson

Keyword(s):

Phospholipid Bilayers ◽

Gramicidin A ◽

Coexisting Phases

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A model of Fe3+-kaolinite, Al3+-goethite, Al3+-hematite equilibria in laterites

Clay Minerals ◽

10.1180/claymin.1989.024.1.01 ◽

1989 ◽

Vol 24 (1) ◽

pp. 1-21 ◽

Cited By ~ 37

Author(s):

F. Trolard ◽

Y. Tardy

Keyword(s):

Stability Field ◽

Equilibrium Conditions ◽

Dissolved Silica ◽

Silica Activity ◽

Proposed Model ◽

Coexisting Phases ◽

Activity Temperature ◽

The Stability ◽

Fe Substitution ◽

Mineral Constituents

AbstractThe distribution of Fe3+-kaolinite, Al-goethite and Al-hematite and their contents of Fe and Al in bauxites and ferricretes are controlled by water activity, dissolved silica activity, temperature and particle size. The proposed model, based on ideal solid-solution equilibria in the Fe2O3-Al2O3-SiO2-H2O system, takes into account water and silica activities. By using the same considerations as those previously developed for the Fe2O3-Al2O3-H2O system, the model calculates the amounts of coexisting phases, Al or Fe substitution ratios in goethite, hematite or kaolinite, and the stability field distributions of the minerals under various conditions. Thermodynamic equilibrium conditions and element distributions within the mineral constituents are shown to be dependent on the parameters cited above. The model yields results compatible with natural observations on lateritic profiles.

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