(2000) Measurement of in situgas-phase diffusion coefficients. Environ. Technol. 21: pp. 631-640Measurement of in situ gas-phase diffusion coefficients. Environmental Technology - L, Atwater - 2000Hers I, Zapf-Gilje R, Li L, Atwater J (2000): Measurement of in situ gas-phase diffusion ...
Thus, nitrous oxide has a density of 1.4 times that of oxygen, but the rate of gaseous diffusion of oxygen is only 1.2 times that of nitrous oxide. When a gas is diffusing into or through an aqueous phase the solubility of the gas in water becomes an important factor, and the diffusing...
The majority of fate and transport models are based on single component behavior modeled by Fick's Law using the pure gas phase diffusion coefficient. The enhancement of the individual diffusive flux in a multicomponent mixture observed in this study and accounted for by pseudo-advec-tive mass ...
Liquid/liquid extraction or solid-phase extraction is commonly used to perform this enrichment step. However, aiming at minimizing the amount of solvent required, other preconcentration techniques have been developed recently. Among them, two techniques can take advantage of the use of supported (...
(Im)-rich regions would lead to zni-phase crystallization25. The linker ratio of the as-synthesized ZIF-62 was calculated from NMR21to contain the ratio of benzimidazole (bIm) to imidazole (Im) of 1.0:4.8 (Supplementary Fig.3) and the formation of ZIF-62 was confirmed using powder X-...
(phase transition) at 30°C, the permeability coefficients of the test gases exponentially increase with gas temperature and the temperature dependence curves do not exhibit an inflection in the glass transition region. On the other hand, the Arrhenius plots of the diffusion coefficients show a ...
where CCl is the concentration of dissolved chloride in the water phase and DCl is the effective diffusion coefficient of dissolved chloride in the pore volume occupied by water. Archie’s law is applied to consider the effects of tortuosity on molecular diffusion in porous media. Thus, DCl is...
phase-field variable at time equals 50 s. The spatial variation of the phase-field-dependent properties with change of the gradient-energy coefficient is given in Fig.1b. On the other hand, Fig.2shows the counterpart contours and curves when the temperature-dependent properties are used [31]...
gas phase atomspolysiloxanemolecular dynamics simulationsMolecular dynamics simulations have been carried out to examine mechanisms of small molecules' diffusion in amorphous polymer membranes. Polydimethylsiloxane (PDMS) structure consisting of three chains of 50 monomers each, were folded into periodic cells...
Liquids and gas are disengaged in a high-pressure separation and the gas phase, contains hydrogen, is compressed and returned to the reactor. A purge must be taken from the recycle to prevent the buildup of light hydrocarbons in the reactor loop, which reduce the efficiency of reactor by ...