INDEX Decane

Aminabhavi, T.M. and Patil, V.B. Density, refractive index, viscosity, and speed of sound in binary mixtures of ethenylbenzene with hexane, heptane, octane, nonane, decane, and dodecane, J. Chem. Eng. Data, 42(3) 641-646, 1997. 

The retention index of 657 for benzene on poly(dimethylsiloxane) in Table 24-3 means that benzene is eluted between hexane (7 = 600) and heptane (7 = 700) from this nonpolar station-aiy phase. Nitropropane is eluted just after heptane on the same column. As we go down the table, the stationary phases become more polar. For (biscyanopropyl)09(cyanopropylphenyl)0l-polysiloxane at the bottom of the table, benzene is eluted after decane, and nitropropane is eluted after -Cl4H30. 

An unknown compound was co-chromatographed with heptane and decane. The adjusted retention times were heptane, 12.6 min decane. 22.9 min unknown, 20.0 min. The retention indexes for heptane and decane are 700 and 1 000, respectively. Find the retention index for the unknown. 

In several previous papers, the possible existence of thermal anomalies was suggested on the basis of such properties as the density of water, specific heat, viscosity, dielectric constant, transverse proton spin relaxation time, index of refraction, infrared absorption, and others. Furthermore, based on other published data, we have suggested the existence of kinks in the properties of many aqueous solutions of both electrolytes and nonelectrolytes. Thus, solubility anomalies have been demonstrated repeatedly as have anomalies in such diverse properties as partial molal volumes of the alkali halides, in specific optical rotation for a number of reducing sugars, and in some kinetic data. Anomalies have also been demonstrated in a surface and interfacial properties of aqueous systems ranging from the surface tension of pure water to interfacial tensions (such as between n-hexane or n-decane and water) and in the surface tension and surface potentials of aqueous solutions. Further, anomalies have been observed in solid-water interface properties, such as the zeta potential and other interfacial parameters. 

In this study, we employed PCS to measure the decay rate of the order-parameter fluctuations in dilute supercritical solutions of heptane, benzene, and decane in CC - The refractive index increment with concentration is much larger than the refractive index increment with temperature in these systems. Therefore the order-parameter fluctuations detected by light scattering are mainly concentration fluctuations and their decay rate T is proportional to the binary diffusion coefficient, D = V/q. The... 

Single Surfactant Systems. Relative intensity results for an equilibrium film of the block copolymer B1 in n-decane sandwiched between two water droplets at 25°C, are shown in Table II. The intensity was independent of the bulk polymer concentration within the accuracy of measurement. Assuming a constant film refractive index this implies that the film thickness is independent of surfactant concentration, and an average value of J was used for the calculation of film thickness. Coalescence occurs below a concentration of 0.1 g dm, presumably because there is insufficient... 

The refractive index versus concentration plot for B1 in n-decane is shown in figure 7. From this it can be inferred that there is only about 20% free oil in the film. Thus the refractive index... 

Figure 7. Refractive index (bulk) versus concentration for the block copolymer in n-decane at 25°C. Ordinate n Abscissa c/g dm. ...

To calculate micelle size and diffusion coefficient, the viscosity and refractive index of the continuous phase must be known (equations 2 to 4). It was assumed that the fluid viscosity and refractive index were equal to those of the pure fluid (xenon or alkane) at the same temperature and pressure. We believe this approximation is valid since most of the dissolved AOT is associated with the micelles, thus the monomeric AOT concentration in the continuous phase is very small. The density of supercritical ethane at various pressures was obtained from interpolated values (2B.). Refractive indices were calculated from density values for ethane, propane and pentane using a semi-empirical Lorentz-Lorenz type relationship (25.) Viscosities of propane and ethane were calculated from the fluid density via an empirical relationship (30). Supercritical xenon densities were interpolated from tabulated values (21.) The Lorentz-Lorenz function (22) was used to calculate the xenon refractive indices. Viscosities of supercritical xenon (22)r liquid pentane, heptane, decane (21) r hexane and octane (22.) were obtained from previously determined values. 

The results for the TEA--water mixtures at atmospheric pressure are shown in Figure 6. These are for TEA mole fractions of x 0.05 and 0.59. The LOST is 18.2 at x - 0.09. We also obtained a very similar data set at the latter mole fraction, but we omitted it for clarity. For contrast and comparison, a data set for pure water is shown. These mixture results again show a sharp rise in heat transfer coefficient as condensate first appeared. In fact, the appearance was remarkably similar to the n-decane--C02 results for x - 0.973 discussed above, but the visibility of the phase separation was enhanced by the presence of a fine emulsion at the phase interface and the absence of strong refractive index gradients characteristic of the supercritical systems. This permitted the structure of the interface to be seen more clearly. In Figure 7 we show photographs that typify the appearance of the two phases. In all cases observed here, both in supercritical vapor--liquid and in liquid--liquid systems, the dense phase appears to wet the cylinder surface regardless of composition. 

Aminabhavi, T. M., Patil, V. B., Aralaguppi, M. I., Phayde, H. T.S., Density, Viscosity, and Refractive Index of the Binary Mixtures of Cyclohexane with Hexane, Heptane, Octane, Nonane, and Decane, J. Chem. Eng. Data 1996, 41, 521 525. 

The system investigated was n-decane-/I-/Y dichloroethyl ether. This system was chosen because of its convenient critical solution temperature, 26.5°C (10). Coexistence curve and index of refraction data have been reported previously by Chu (10,11). 

Cumulative Index of Heterocyclic Systems 3-Azabicyclo [3.3.2]decane (33)... 

Cumulative Index of Heterocyclic Systems 1,5-Diazatricyclo[4.2.1. l ]decane (510)... 

The hydroisomerisation of -decane is one such test reaction where a modified constraint index Cl is defined as the ratio of the formation of 2-methylnonane to that of 5-methylnonane. Cl is found to increase over the range 1-10 as the pore size decreases from large to medium pore (for Y, Cl is ca. 1, whereas for ZSM-5, Cl is ca. 10). However, like Cl, it gives relatively little differentiation between large-pore zeolites, and explanation for the origin of the Cl values remains ambiguous. 

Ethyl tricycio [3.3.1.1 ] decane-1-carboxylate. See Ethyl tricyclodecanecarboxylate Ethyltriethoxysilane CAS 78-07-9 EINECS/ELINCS 201-080-1 Synonyms Silane, ethyltriethoxy- Silane, triethoxyethyl- Triethoxy-ethylsilane Empiricai CsH2o03Si Formula CH3CH2Si(OC2Hs)3 Properties M.w. 192.33 sp.gr. 0.895 b.p. 158-160 C flash pt. 29 C ref. index 1.3955 (20 C) Toxicology LD50 (oral, rat) 14 g/kg, (skin, rabbit) 16 ml/kg may be harmful by inh., ing., or skin absorp. may cause eye/skin irritation TSCA listed... 

The results with isohexadecane are summarised in Table 9.2. As with the hexa-decane system, the droplet size and polydispersity index decreased with increasing... 

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