Thermal and Mutual Diffusivity of Binary Mixtures of n-Dodecane and n-Tetracontane with Carbon Monoxide, Hydrogen, and Water from Dynamic Light Scattering (DLS)

Abstract

The present work represents a continuation of a former study where the simultaneous determination of thermal and mutual diffusivity for binary mixtures of n-octacosane (n-C28H58) with dissolved carbon monoxide (CO), hydrogen (H2), or water (H2O) by using dynamic light scattering (DLS) was demonstrated. Here, the same properties are studied for binary mixtures of the n-alkanes n-dodecane (n-C12H26) or n-tetracontane (n-C40H82) with dissolved CO, H2, or H2O. In most cases, expanded relative uncertainties (k = 2) ranging from 2 to 12 % and 3 to 25 % for the thermal and mutual diffusivities could be obtained. The experimental mutual diffusivities for mixtures of n-C12H26 with CO, H2, or H2O measured at temperatures from 398 to 524 K and pressures from 0.2 to 4.2 MPa at saturation conditions agree well with molecular dynamics (MD) simulations using atomistic models and with experimental data from literature. Binary mixtures of n-C40H82 with dissolved CO, H2, or H2O were investigated in a temperature range from 447 to 498 K and pressures from 0.3 to 3.9 MPa. For mixtures with n-C40H82, the accessible temperature range was limited due to a change in the optical characteristics of the sample at elevated temperatures where DLS measurements suffered from absorption effects and particle scattering.

Green Synthesis of Iron Nanoparticles by Aqueous Extract of Eriobotrya japonica Leaves as a Heterogeneous Fenton-like Catalyst: Degradation of Basic Red 46

“…4(a) the synthesized FeNPs are irregular spherical and porous morphology, indicating a chain structure with a diameter ranging from 30 -100 nm. Also, they are highly prone to agglomeration, therefore the mean hydrodynamic diameters of nanoparticles were found as higher than 100 nm by DLS analysis, this state may be due to the absorption effects and particle scattering because of agglomeration [15]. Similar agglomeration behavior of nanoparticles was reported by Truskewycz et al, 2016, [2] for iron nanoparticles synthesized by using green tea extract.…”

Diffusivities of an Equimolar Methane–Propane Mixture Across the Two-Phase Region by Dynamic Light Scattering

“…The limitation regarding the resolution of multiple hydrodynamic modes accessible by DLS is not only restricted to the supercritical state close to the vicinity of the plait critical point. It was also observed close to the consolute critical point of a ternary mixture [8,9], in the saturated liquid phase of a binary mixture at vapor-liquid equilibrium [10][11][12], and in the liquid state for binary mixtures near their plait critical point [13]. For the last two cases, this limitation was observed close to the region where thermal and Fick diffusivities match.…”

Biosynthesis and Characterization of Iron Nanoparticles for Effective Adsorption of Cr(VI)

“…According to Figures 2(a)-2(c), it was seen that the agglomeration tendency of nanoparticles gave rise to the formation of nanoparticles which had higher mean hydrodynamic diameters. erefore, the mean hydrodynamic diameters of nanoparticles were found as higher than 100 nm by DLS analysis may be due to the absorption effects and particle scattering because of agglomeration [17]. After Cr(VI) adsorption, as shown from Figures 2(d) and 2(e), it was observed that the nanoparticles were more agglomerated, and the pores were closed due to the adsorption of Cr(VI) anions onto the adsorbent surface.…”