Thermal conductivity of water and 2-n-butoxyethanol and their mixtures in the temperature range 305?350 K at pressures up to 150 MPa

Mensah-Brown, Henry; Wakeham, W. A.

doi:10.1007/bf01438974

Cited by 13 publications

(6 citation statements)

References 18 publications

(13 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the specific heat capacity c there are many experimental confirmations for the theoretically predicted Ising exponent α = 0.110. , The expected power law with Ising-like critical exponent β for the order parameter, i.e., the concentration difference of one of the two compounds between the coexisting phases, has been mainly verified via the dielectric permittivity and has also been confirmed . There have also been suggestions for the existence of a critical anomaly in the thermal conductivity κ in the mixed phase. , However, recent high-resolution precision experiments on several binary liquid mixtures have shown the absence of this anomaly. , Moreover, these experiments have shown that, in the phase-separated temperature region, the thermal conductivity difference between the two phases follows a power law with critical exponent β. This confirms expectations that also the thermal conductivity difference between the coexisting phases is an appropriate measure for the order parameter and the concentration.…”

Section: Resultsmentioning

confidence: 93%

“…90 There have also been suggestions for the existence of a critical anomaly in the thermal conductivity κ in the mixed phase. 91,92 However, recent highresolution precision experiments on several binary liquid mixtures have shown the absence of this anomaly. 73,74 Moreover, these experiments have shown that, in the phase-separated temperature region, the thermal conductivity difference between the two phases follows a power law with critical exponent β.…”

Section: T H I S C O N T E N T Imentioning

confidence: 99%

See 1 more Smart Citation

Task-Specific Ionic Liquid for Solubilizing Metal Oxides

et al. 2006

View full text Add to dashboard Cite

Protonated betaine bis(trifluoromethylsulfonyl)imide is an ionic liquid with the ability to dissolve large quantities of metal oxides. This metal-solubilizing power is selective. Soluble are oxides of the trivalent rare earths, uranium(VI) oxide, zinc(II) oxide, cadmium(II) oxide, mercury(II) oxide, nickel(II) oxide, copper(II) oxide, palladium(II) oxide, lead(II) oxide, manganese(II) oxide, and silver(I) oxide. Insoluble or very poorly soluble are iron(III), manganese(IV), and cobalt oxides, as well as aluminum oxide and silicon dioxide. The metals can be stripped from the ionic liquid by treatment of the ionic liquid with an acidic aqueous solution. After transfer of the metal ions to the aqueous phase, the ionic liquid can be recycled for reuse. Betainium bis(trifluoromethylsulfonyl)imide forms one phase with water at high temperatures, whereas phase separation occurs below 55.5 degrees C (temperature switch behavior). The mixtures of the ionic liquid with water also show a pH-dependent phase behavior: two phases occur at low pH, whereas one phase is present under neutral or alkaline conditions. The structures, the energetics, and the charge distribution of the betaine cation and the bis(trifluoromethylsulfonyl)imide anion, as well as the cation-anion pairs, were studied by density functional theory calculations.

show abstract

Section: Resultsmentioning

confidence: 93%

Section: T H I S C O N T E N T Imentioning

confidence: 99%

Task-Specific Ionic Liquid for Solubilizing Metal Oxides

et al. 2006

View full text Add to dashboard Cite

show abstract

“…Thus the parameter drops out of the expression for the thermal conductivity in the asymptotics, but determines its (lower) background value [2]. This enhancement at the consolute point has indeed been observed in 2-butoxy-ethanol-water mixture at the critical concentration [3,4].…”

Section: Introductionmentioning

confidence: 92%

Critical Sound in Fluids and Mixtures

Folk¹,

Moser²

1999

Condens. Matter Phys.

View full text Add to dashboard Cite

The behaviour of sound is explained within the dynamical renormalization group theory. Non-asymptotic effects are due to the deviation of renormalized couplings from their fixed point values. We calculate the temperature and frequency dependence of the sound velocity and absorption near the consolute point and the gas liquid critical point in pure fluids and mixtures. The critical non-asymptotic time scale in mixtures is different from the pure fluid case and set by an effective order parameter Onsager coefficient containing the dynamical parameter related to the enhancement of the thermal conductivity. We discuss the relation to the phenomenological theory of Ferrell and Bhattacharjee for the consolute point and compare with experiments in pure 3 He, 4 He and 3 He-4 He mixtures near the plait point.

show abstract

“…18,19 However, more recent work by Mensah-Brown and Wakeham reported a critical anomaly for κ in the binary system butoxyethanol-water. 20,21 Nevertheless, in a high-resolution photopyroelectric study in the beginning of the present decade by some of us, it was shown that the anomaly in butoxyethanol-water is absent as well as in several other binary liquid systems. [22][23][24] The absence of a critical enhancement in the thermal conductivity at these consolute points are in accordance with theoretical estimates by Anisimov et al for these (almost) incompressible liquid solutions.…”

Section: Introductionmentioning

confidence: 99%

Temperature-Driven Mixing-Demixing Behavior of Binary Mixtures of the Ionic Liquid Choline Bis(trifluoromethylsulfonyl)imide and Water

Nockemann¹,

et al. 2009

View full text Add to dashboard Cite

The ionic liquid (2-hydroxyethylammonium)trimethylammonium) bis(trifluoromethylsulfonyl)imide (choline bistriflimide) was obtained as a supercooled liquid at room temperature (melting point=30 degrees C). Crystals of choline bistriflimide suitable for structure determination were grown from the melt in situ on the X-ray diffractometer. The choline cation adopts a folded conformation, whereas the bistriflimide anion exhibits a transoid conformation. The choline cation and the bistriflimide anion are held together by hydrogen bonds between the hydroxyl proton and a sulfonyl oxygen atom. This hydrogen bonding is of importance for the temperature-dependent solubility properties of the ionic liquid. Choline bistriflimide is not miscible with water at room temperature, but forms one phase with water at temperatures above 72 degrees C (equals upper critical solution temperature). 1H NMR studies show that the hydrogen bonds between the choline cation and the bistriflimide anion are substantially weakened above this temperature. The thermophysical properties of water-choline bistriflimide binary mixtures were furthermore studied by a photopyroelectric technique and by adiabatic scanning calorimetry (ASC). By photothermal analysis, besides highly accurate values for the thermal conductivity and effusivity of choline bistriflimide at 30 degrees C, the detailed temperature dependence of both the thermal conductivity and effusivity of the upper and lower part of a critical water-choline bistriflimide mixture in the neighborhood of the mixing-demixing phase transition could be determined with high resolution and accuracy. Together with high resolution ASC data for the heat capacity, experimental values were obtained for the critical exponents alpha and beta, and for the critical amplitude ratio G+/G-. These three values were found to be consistent with theoretical expectations for a three dimensional Ising-type of critical behavior of binary liquid mixtures.

show abstract

Thermal conductivity of water and 2-n-butoxyethanol and their mixtures in the temperature range 305?350 K at pressures up to 150 MPa

Cited by 13 publications

References 18 publications

Task-Specific Ionic Liquid for Solubilizing Metal Oxides

Task-Specific Ionic Liquid for Solubilizing Metal Oxides

Critical Sound in Fluids and Mixtures

Temperature-Driven Mixing-Demixing Behavior of Binary Mixtures of the Ionic Liquid Choline Bis(trifluoromethylsulfonyl)imide and Water

Contact Info

Product

Resources

About