51 research outputs found
”Bulk and trace elements" in saline water produced from the Danish North Sea: The chemical analysis and the trends in the retrieved data
Hydrocarbon Fingerprinting of Kraka and neighboring oil fields - Tracking temporal changes in oil and core samples during long term production and EOR experiments
Electrical Double-Layer and Ion Bridging Forces between Symmetric and Asymmetric Charged Surfaces in the Presence of Mono- and Divalent Ions
An atomic force microscope, employing
the colloidal probe technique, was used to study the interactions
between six different combinations of silane-functionalized silica
surfaces in NaCl and CaCl<sub>2</sub> solutions. The surfaces consisted
of monolayers of the apolar trimethoxyÂ(octyl)Âsilane, the positively
charged (3-aminopropyl)Âtrimethoxysilane, and the negatively
charged (3-mercaptopropyl)Âtrimethoxysilane. The interactions
between the three symmetric systems, as well as between the three
asymmetric combinations of surfaces, were measured and compared to
calculated electrical double-layer forces. The results demonstrated
that the long-range interactions between the surfaces in all cases
were dominated by double-layer forces, while short-range interactions,
including adhesion, were dominated by ion bridging forces in the cases
where both interaction surfaces favored adsorption of calcium ions.
The study thus also demonstrates how surface force studies in mono-
and divalent salt solutions can be used as an analytical tool for
probing specific functional groups on heterogeneous surfaces
Characterization of heteroatom distributions in the polar fraction of North Sea oils using high-resolution mass spectrometry
Coating a self-healing underground tank for safe storage of CO<sub>2Â </sub>in chalk reservoirs
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