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Differential scanning calorimetry (DSC) and inelastic neutron scattering were applied to study the phase separation kinetics of Maya asphaltene water-in-oil emulsion by following the water separation from the upper phase. In addition, transformation of the separated water from the free state to the bound and/or restricted state was also investigated. Maya asphaltene in toluene with 0.1M HCl forms...
Low frequency dielectric spectroscopy was applied to investigate the properties of Furrial crude oil that is infamous for asphaltene precipitation during production. An experiment was conducted at ambient temperature by mixing Furrial crude oil with hexane to induce flocculation and subsequent precipitation. A drastic change in dielectric response was observed near the critical point when flocculation...
The purpose of this study was to evaluate DNA degradation upon thermal heating using dielectric relaxation and direct current (DC) conductivity methods. Herring sperm DNA, human growth hormone (HgH) plasmid DNA, and secreted alkaline phosphatase (SEAP) plasmid DNA were used as the examples. DNA was heated at 80°C for 1 hour. The dielectric relaxation spectra as a function of the applied field frequency...
Small-angle neutron scattering (SANS) was used to study the fractal structure of Ratawi petroleum asphaltenes in toluene. For analysis of the SANS data, the asphaltene aggregates are modelled as polydisperse fractal objects containing monodisperse asphaltene micelles as unit particles. This model is applicable to asphaltene concentrations of 10-80 wt%. The results show that the asphaltenes are well...
Studies with the vacuum residue from Ratawi crude oil and the asphaltenes obtained from this residue support certain aspects of both the Pfeiffer-Saal and Yen models of the nature of asphaltenes in heavy oil. However, the asphaltenic molecules are not found to be macromolecular. Instead, 100 asphaltenic molecules, with molecular weights of 1000 u, spontaneously self-associate to form micelle-like...
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