The physical properties of some fluorine compounds and their solutions. Part 4.—Solutions in hydrocarbons

Dyke, D. E. L.; Rowlinson, J. S.; Thacker, Raymond

doi:10.1039/tf9595500903

Cited by 37 publications

(17 citation statements)

References 2 publications

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“…21 Setting T c ϭ319 K and using T c ϭ(6/R g ) ϫ͓u M P Ϫ(u M M ϩu PP )/2͔, with R g being the gas constant, then determine that u M P ϭϪ2516 J/mol, i.e., the MC-PF interaction is about 10% weaker than the geometric mean of the interaction between like molecules. 16 We further use u MS ϭϪ5559 J/mol and u PS ϭϪ2875 J/mol, and estimate L M ϭ3.494ϫ10 4 J/mol and L P ϭ3.419ϫ10 4 J/mol from vapor pressure data. 53 The interlayer distance is taken to be 6.435 Å.…”

Section: B the Liquidõliquid Interfacementioning

confidence: 99%

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Quenching of capillary waves in composite wetting films from a binary vapor: An x-ray reflectivity study

2001

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We report x-ray reflectivity measurements of the internal structure of thin wetting films formed on a silicon substrate from the vapor of a binary mixture of methylcyclohexane ͑MC͒ and perfluoromethylcyclohexane ͑PF͒. At Tϭ30°C ͑below the bulk consolute temperature of T c Ϸ46°C) variation in the difference in temperature between the substrate and the vapor induces changes in film thickness ͑25 to 135 Å) that are consistent with complete wetting of both surfaces, with a MC-rich phase wetting the substrate and a PF-rich phase wetting the free surface. The width of the internal liquid/liquid interface, however, is found to be noticeably smaller than values predicted from the convolution of the intrinsic interfacial profile between bulk liquids with the capillary wave roughness as modified by dispersion interactions with the substrate. The difference is attributed to the effects of confinement. Although the width of the liquid/liquid interface is less well defined above the consolute point (Tϭ60°C), we still find PF enrichment at the free surface and MC enrichment at the substrate.

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Section: B the Liquidõliquid Interfacementioning

confidence: 99%

“…[16][17][18][19][20] At TϷ30°C, in the region of two-phase coexistence, we find clear phase separation within thin wetting films over a range of film thicknesses, with the liquid/liquid interface approximately in the middle of the film. This allows investigation of the interfacial width as a function of distance from the substrate.…”

Section: Introductionmentioning

confidence: 99%

Quenching of capillary waves in composite wetting films from a binary vapor: An x-ray reflectivity study

2001

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“…In 1958 Scott [2] reviewed various explanations of this anomalous behavior and concluded that none of the proposed suggestions accounted fully for the anomalous behavior of all systems investigated. Dyke et al [3] concluded from studies of the gas-liquid critical locus that the unlike interaction is weak. Subsequent attemps at a theoretical description were, in the main, restricted to methane + perfluoromethane [4], relying heavily on the interaction weakness demonstrated by the second virial coefficients for that mixture.…”

Section: Introductionmentioning

confidence: 99%

The theoretical prediction of the cricital points of alkanes, perfluoroalkanes, and their mixtures using bonded hard-sphere (BHS) theory

et al. 1996

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The adequacy of the recently developed bonded hard-sphere (BHS) theory in describing the critical behavior of the homologous series of the alkanes and perfluoroalkanes is examined in this work. A simple united atom model, formed from chains of tangent hard spheres, reproduces the major experimental trends and provides good quantitative agreement for systems with two or more carbon atoms. This simple model cannot, however, reproduce the anomalous behavior of the critical pressure of the alkane series: the values of the critical pressure and temperature for methane are smaller than expected. A more sophisticated distributed-site model, which takes explicit account of the backbone and substituent atoms, reproduces this anomalous behavior. The BHS theory has also been used to predict the upper critical solution temperatures of alkane + perfiuoroalkane mixtures. For most systems, the segment-segment parameters are fitted to the butane + perfluorobutane system, although in the case of mixtures containing methane, methane + perfluoromethane parameters must be used. Excellent qualitative agreement with experimental data is seen. This indicates the strength of the BHS approach as a type of group contribution method.

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“…by 34 K, essentially the same as quoted above for T UCS of (tetrachloromethane+a heptane). (29,30) The simple conclusion, seemingly unremarked previously, is that in an (alkane + perfluoroalkane) with fixed numbers of carbon atoms in each component, cyclization of the alkane raises T UCS and branching of the alkane lowers T UCS , whereas cyclization of the perfluoroalkane lowers T UCS but little, apparently, is known about the effect on T UCS of (alkane + perfluoroalkane) of perfluoroalkane branching. Many of these relations are evident from a close scrutiny of the collected T UCS of (alkane + perfluoroalkane) reported by Young et al (19) The T UCS of all reported (alkane+perfluoroalkane) have been comprehensively analyzed using the Bonded Hard Sphere theory.…”

Section: Discussionmentioning

confidence: 96%

Orthobaric surface tension of (tetrachloromethane + tetradecafluoromethylcyclohexane) in the critical region at temperatures fromT= 303 K toT= 315 K

McLure

Fernández

1996

The Journal of Chemical Thermodynamics

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The physical properties of some fluorine compounds and their solutions. Part 4.—Solutions in hydrocarbons

Cited by 37 publications

References 2 publications

Quenching of capillary waves in composite wetting films from a binary vapor: An x-ray reflectivity study

Quenching of capillary waves in composite wetting films from a binary vapor: An x-ray reflectivity study

The theoretical prediction of the cricital points of alkanes, perfluoroalkanes, and their mixtures using bonded hard-sphere (BHS) theory

Orthobaric surface tension of (tetrachloromethane + tetradecafluoromethylcyclohexane) in the critical region at temperatures fromT= 303 K toT= 315 K

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