Turbidity of deuterated isobutyric acid and heavy water in the one‐phase region near the critical solution point

1992 ◽  
Vol 97 (1) ◽  
pp. 464-469 ◽  
Author(s):  
Lori W. DaMore ◽  
D. T. Jacobs
Keyword(s):  
Heavy Water ◽  
Isobutyric Acid ◽  
Phase Region ◽  
Critical Solution Point ◽  
Solution Point ◽  
The One

Turbidity of polystyrene in diethyl malonate in the one-phase region near the critical solution point

1990 ◽  
Vol 23 (2) ◽  
pp. 470-475 ◽  
Author(s):  
S. G. Stafford ◽  
A. C. Ploplis ◽  
D. T. Jacobs
Keyword(s):  
Diethyl Malonate ◽  
Phase Region ◽  
Critical Solution Point ◽  
Solution Point ◽  
The One

Density of polystyrene in diethyl malonate in the one-phase and two-phase regions near the critical solution point

1987 ◽  
Vol 20 (9) ◽  
pp. 2238-2240 ◽  
Author(s):  
K. Gruner ◽  
S. C. Greer
Keyword(s):  
Diethyl Malonate ◽  
Two Phase ◽  
Critical Solution Point ◽  
Solution Point ◽  
The One

1H and 2H NMR Studies of Mixtures 2,6-Lutidine/Water Near the Lower Critical Solution Point

1992 ◽  
Vol 47 (4) ◽  
pp. 583-587 ◽  
Author(s):  
Vytautas Balevicius ◽  
Norbert Weiden ◽  
Alarich Weiss
Keyword(s):  
Phase Region ◽  
Spin Lattice Relaxation ◽  
Nmr Studies ◽  
Two Phase ◽  
H Nmr ◽  
Coexisting Phases ◽  
Critical Solution Point ◽  
Solution Point ◽  
Concentration Changes ◽  
Nmr Signals

AbstractDeuteron spin-lattice relaxation time (TJ measurements of binary mixtures 2,6-lutidine/D20 have been done near the lower critical solution point (TC, L), ε = (T - TC, L)/TC, L ≧10-5. Singularities are observed at TC, L. The changes in the slope of T1 (2H) = ƒ ( T ) can be interpreted as due to the effect of concentration changes on Ty and simultaneously strong overlaping of 2H NMR signals from coexisting phases. In the two-phase region, ca. 2°C above TC, L two D2O signals with very strong temperature evolution have been detected. Similar doubling of 2,6-lutidine 1H NMR signals has been observed already at T - TC, L ≦ 1 °C. It is shown that the two signals arise from the nuclei in two coexisting phases; they are not due to pecularities of hydrogen bond. The difference between chemical shifts of both D2O signals δ’ - δ” possess the property of an order parameter, i.e. δ’ - δ” ~ εβ with β = 0.336±0.030

The specific heat anomaly in triethylamine–heavy water near the critical solution point

1980 ◽  
Vol 73 (9) ◽  
pp. 4628-4635 ◽  
Author(s):  
E. Bloemen ◽  
J. Thoen ◽  
W. Van Dael
Keyword(s):  
Specific Heat ◽  
Heavy Water ◽  
Critical Solution Point ◽  
Solution Point

ChemInform Abstract: THE SPECIFIC HEAT ANOMALY IN TRIETHYLAMINE-HEAVY WATER NEAR THE CRITICAL SOLUTION POINT

1981 ◽  
Vol 12 (10) ◽  
Author(s):  
E. BLOEMEN ◽  
J. THOEN ◽  
W. VAN DAEL
Keyword(s):  
Specific Heat ◽  
Heavy Water ◽  
Critical Solution Point ◽  
Solution Point

Scaling Near the Critical Point in Mixture

2005 ◽  
Author(s):  
Eldred H. Chimowitz
Keyword(s):  
Critical Point ◽  
Binary Systems ◽  
Critical Line ◽  
Phase Region ◽  
Unique Point ◽  
Pure Fluid ◽  
High Volatility ◽  
Two Phases ◽  
The One ◽  
Dew Line

The critical point of mixtures requires a more intricate set of conditions to hold than those at a pure-fluid critical point. In contrast to the pure-fluid case, in which the critical point occurs at a unique point, mixtures have additional thermodynamic degrees of freedom. They, therefore, possess a critical line which defines a locus of critical points for the mixture. At each point along this locus, the mixture exhibits a critical point with its own composition, temperature, and pressure. In this chapter we investigate the critical behavior of binary mixtures, since higher-order systems do not bring significant new considerations beyond those found in binaries. We deal first with mixtures at finite compositions along the critical locus, followed by consideration of the technologically important case involving dilute mixtures near the solvent’s critical point. Before taking up this discussion, however, we briefly describe some of the main topographic features of the critical line of systems of significant interest: those for which nonvolatile solutes are dissolved in a solvent near its critical point. The critical line divides the P–T plane into two distinctive regions. The area above the line is a one-phase region, while below this line, phase transitions can occur. For example, a mixture of overall composition xc will have a loop associated with it, like the one shown in figure 4.1, which just touches the critical line of the mixture at a unique point. The leg of the curve to the “left” of the critical point is referred to as the bubble line; while that to the right is termed the dew line. Phase equilibrium occurs between two phases at the point where the bubble line at one composition intersects the dew line; this requires two loops to be drawn of the sort shown in figure 4.1. A question naturally arises as to whether or not all binary systems exhibit continuous critical lines like that shown. In particular we are interested in the situation involving a nonvolatile solute dissolved in a supercritical fluid of high volatility.

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