Surface preparation dyne liquids

By the use of measured volumes of liquid ozone at low temperature, liquid ozone-oxygen mixtures are prepared without ozone decomposition. Techniques for the preparation, mixing, disposal, and measurement of the physical properties of these mixtures are described at the liquid phase boundaries at —183 and —195.5° C., the specific volume of ozone-oxygen mixtures is additive within experimental error (0.005 gram per cc). The viscosity of solutions at —183° C. (on a log scale) varied linearly with the composition from 0.189 cp. for 100% oxygen to 1.57 cp. for 100% ozone. At —195.5° C., the viscosity of supercooled liquid ozone is 4.20 cp. Single phase liquid ozone-oxygen mixtures are Newtonian fluids. The surface tension of liquid ozone is 43.8 and 38.4 dynes per cm. at —195.5° and —183°C., respectively. The parachor of liquid ozone is 76.5. 

Carbon Sulphidoselenide, CSSe, may be prepared by the action of carbon disulphide vapour on ferrous selenide at 650° C. The product, on fractional distillation through a 50-inch head-filled glass column, yields a deep yellow liquid as residue, which on repeated fractionation through the same column yields a middle fraction of the pure sulphidoselenide. It is obtained as a yellow oil of boiling-point 88-90° to 83-95° C. at 749-2 mm., and having a surface tension y =40-44 dynes/cm. at 20° C. 

By the sublimation of sulfur hexafluoride in 1933 Denbigh and Whytlaw-Gray (66, 67) found a small liquid residue which they identified as S2Fh>. From 20 liters of crude SF6 gas they recovered only about 20 ml of S2Fio vapor. This method of preparation has been confirmed by others (34, 100, 101, 269, 270, 307). The substance is a colorless volatile liquid which has a surface tension of 13.9 dyne/cm at 0°C. From its vapor pressure, logw Pmm = 7.95 — 1530/T, its heat of vaporization is calculated to be 7000 cal/mole (67). Liquid S2Fi0 has a specific electrical conductivity somewhere between 10 12 and 10 14 ohm-1 cm-1, a dielectric constant of 2.030 at 10° and a density of 2.081, 2.054, and 2.028 gm/ml at 4°, 12°, and 20°, respectively. Its dipole moment is 0 (155). Each sulfur atom is linked octahedrally to five fluorine atoms at a distance of 1.56 A and to the other sulfur atom at a distance of 2.21 A (7, 129). 

Standard values of 20 dyne/cm for surface tension and 0.20 cps for liquid viscosity have been used to prepare Figure 7-6. This correlation was developed from data on liquids with surface tensions as low as 5 dyne/cm and viscosities as high as 1.1 cps. 

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