Blar i Institutt for kjemisk prosessteknologi på tidsskrift "Langmuir"
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Assessing the Interfacial Activity of Insoluble Asphaltene Layers: Interfacial Rheology versus Interfacial Tension
(Peer reviewed; Journal article, 2020)Asphaltenes have been suggested to play an important role in the remarkable stability of some water-in-crude oil emulsions, although the precise mechanisms by which they act are not yet fully understood. Being one of the ... -
Coalescence Behavior of Stable Pendent Drop Pairs Held at Different Electric Potentials
(Journal article; Peer reviewed, 2020)In this work, we studied the electrocoalescence behavior of stable pendent drop pairs and compared the results with clean drops, where the interface is void of surface-active compounds. The drop phase was brine and the ... -
Insights into hydrogen transport behavior on perovskite surfaces: Transition from the Grotthuss mechanism to the “vehicle” mechanism
(Journal article; Peer reviewed, 2019)Hydrogen transport on transition-metal oxides is a shared process in many important physical and chemical changes of interest. In this work, DFT + U calculations have been carried out to explore the mechanism for hydrogen ... -
Interfacial Dilational Rheology of Molecular Films in DC Electric Fields
(Journal article; Peer reviewed, 2022)We present a novel technique to measure the interfacial dilational rheology of a molecular film adsorbed at a water–oil interface in a direct-current (dc) electric field. A film of a highly polar subfraction of asphaltenes ... -
Mechanisms of Physical Stabilization of Concentrated Water-In-Oil Emulsions Probed by Pulse Field Gradient Nuclear Magnetic Resonance and Rheology through a Multiscale Approach
(Journal article; Peer reviewed, 2018)The long-term physical stability of surfactant-stabilized (Span 80 and Tween 20) concentrated water-in-mineral oil (W/O) emulsions in the presence of an electrolyte (NaCl) was studied. Pulse field gradient NMR and rheology ... -
Microcalorimetry Study of the Adsorption of Asphaltenes and Asphaltene Model Compounds at the Liquid–Solid Surface
(Journal article; Peer reviewed, 2016)The adsorption of an acidic polyaromatic asphaltene model compound (C5PeC11) and indigenous C6-asphaltenes onto the liquid–solid surface is studied. Model compound C5PeC11 exhibits a similar type of adsorption with a plateau ... -
Sorption and Interfacial Rheology Study of Model Asphaltene Compounds
(Journal article; Peer reviewed, 2016)The sorption and rheological properties of an acidic polyaromatic compound (C5PeC11), which can be used to further our understanding of the behavior of asphaltenes, are determined experimentally. The results show that ...