The thermal conductivity of diamond-like carbon (DLC) films prepared by RF plasma enhanced CVD were investigated by 3ω method. With the results of Raman spectroscopy and Rutherford Back Scattering / Elastic Recoil Detection Analysis (RBS/ERDA), the influence of amorphousness and density on the thermal conductivity of DLC film was discussed. DLC films from methane showed no obvious dependence on density. On the other hand, depending on deposition condition, DLC films with low amorphousness from acetylene showed dependence on density, while DLC films with high amorphousness from acetylene did not show such dependence on density.
Calculation of solubility of organic compounds in supercritical CO2 based on the quantitative structure-activity relationships (QSAR) and theoretical linear solvation energy relationships (TLSER) have an advantage of its ability of extrapolation over the empirical correlation, since the TLSER correlations use computationally derivable sets of molecular parameters. In this study, solubilities of 32 organic compounds in supercritical CO2 at 308 K, 20 MP were correlated based on the TLSER method using four molecular properties of solute; polarizability index, molecular orbital acidity, electrostatic basicity and electrostatic acidity. Molecular properties of solute were determined with PM3 method and COSMO-PM3 method. While a fairly reasonable correlation was found for many compounds, relatively large deviation was found for some compounds.
The gaseous diffusion coefficients of propane (C3H8) and propylene (propene, C3H8) into air, nitrogen and oxygen have been measured in the temperature range 303∼453 K and at atmospheric pressure by the use of the Taylor dispersion method. Both for propane and propylene, the diffusion coefficients do not vary in practice on substituting pure nitrogen or oxygen for air. The diffusion coefficients for propylene are systematically larger than those for propane by about 3%. The present results can be reproduced well by the functional form D/cm2s−1=A(T/K)B, where D is the diffusion coefficient at 101.325 kPa (1 atm)and T is the absolute temperature. The constants A and B are as follows: propane-(air, nitrogen, oxygen), A= 4.65×10−6, B= 1.77; propylene-(air, nitrogen, oxygen), A= 5.08×10−6, B= 1.76.