Blar i NTNU Open på forfatter "Sørland, Geir"
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Absorption of CO2 in lyotropic liquid crystals
Rodriguez Fabia, Sandra; Øyen, Marita; Winter-Hjelm, Nicolai; Norrman, Jens; Lund, Reidar; Sørland, Geir; Knuutila, Hanna; Sjøblom, Johan; Paso, Kristofer Gunnar (Peer reviewed; Journal article, 2020)Vapor–liquid equilibria data of three poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide)/water liquid crystals (LCs) with CO2 has been obtained up to 6 bar. The investigated LCs consist of 60% (EO)3(PO)50(EO)3 ... -
Demulsification of crude oil emulsions tracked by pulsed field gradient NMR. Part II: Influence of chemical demulsifiers in external AC electric field
Hjartnes, Tomas; Mhatre, Sameer; Gao, Bicheng; Sørland, Geir; Simon, Sebastien Charles; Sjøblom, Johan (Journal article; Peer reviewed, 2020)Crude oil emulsions can reach stability levels that pose severe challenges for the processing industry. Certain conventional methods are used to deal with these challenges, such as chemical demulsification. In this article, ... -
Effects of post anaerobic digestion thermal hydrolysis on dewaterability and moisture distribution in digestates
Svennevik, Oda K; Solheim, Odd Egil; Beck, Greeley; Sørland, Geir; Jonassen, Kjell Rune; Rus, Ester; Westereng, Bjørge; Horn, Svein Jarle; Higgins, Matthew J; Nilsen, Pål Jahre (Journal article; Peer reviewed, 2019)Organic waste fractions such as sewage sludge, food waste and manure can be stabilized by anaerobic digestion (AD) to produce renewable energy in the form of biogas. Following AD, the digested solid fraction (digestate) ... -
Emulsions in external electric fields
Sjøblom, Johan; Mhatre, Sameer; Simon, Sebastien Charles; Skartlien, Roar; Sørland, Geir (Peer reviewed; Journal article, 2021)Water is co-produced with crude oils, generally in the form of water-in-crude oil emulsions. The oil and water phases need to be separated before export. Separation is performed in gravity separators with the addition of ... -
Improved Methods for Characterizing Emulsions by Low‑Resolution Nuclear Magnetic Resonance via Surface Relaxation and One‑Dimensional Images
Sørland, Geir; Less, Simone; Alkhabbaz, Sajjad; Simon, Sebastien Charles Roger (Peer reviewed; Journal article, 2023)The use of nuclear magnetic resonance (NMR) is an appropriate tool for studying colloids in a non-invasive manner. Droplet size distributions and one-dimensional sample profiles are readily produced to characterize an ... -
Improved Methods for Characterizing Emulsions by Low‑Resolution Nuclear Magnetic Resonance via Surface Relaxation and One‑Dimensional Images
Sørland, Geir; Less, Simone; Alkhabbaz, Sajjad; Simon, Sebastien Charles Roger (Peer reviewed; Journal article, 2023)The use of nuclear magnetic resonance (NMR) is an appropriate tool for studying colloids in a non-invasive manner. Droplet size distributions and one-dimensional sample profiles are readily produced to characterize an ... -
The influence of asphaltenes and pour point depressants on the paraffin wax crystallization investigated by nuclear magnetic resonance and atomic force microscopy
Savulescu, George-Claudiu (Doctoral theses at NTNU, 2024:67, Doctoral thesis, 2024)Wax crystallization in pipelines in cold environments is a key challenge for flow assurance during oil production. Pour point depressants have been used to delay wax crystallization and gelling, by modifying rheological ... -
Influence of wax inhibitor molecular weight: Fractionation and effect on crystallization of polydisperse waxes
Ruwoldt, Jost; Kurniawan, Muh; Sørland, Geir; Simon, Sebastien Charles; Sjøblom, Johan (Journal article; Peer reviewed, 2019)The influence of wax inhibitor molecular weight on wax crystallization was investigated in three steps: (1) Wax inhibitor fractionation via stepwise precipitation or ultrasonic disintegration, (2) characterization of ... -
Inhibitor-wax interactions and PPD effect on wax crystallization: New approaches for GC/MS and NMR, and comparison with DSC, CPM, and rheometry
Ruwoldt, Jost; Sørland, Geir; Simon, Sebastien Charles; Oschmann, Hans-Jörg; Sjøblom, Johan (Journal article; Peer reviewed, 2019)Three pour point depressants (PPDs) with different chemistries, and extracted asphaltenes were studied in their influence on wax crystallization in a model system. A new procedure for nuclear magnetic resonance (NMR) was ... -
Mechanisms of Physical Stabilization of Concentrated Water-In-Oil Emulsions Probed by Pulse Field Gradient Nuclear Magnetic Resonance and Rheology through a Multiscale Approach
Pradilla, Diego; Barrera, Ana; Sætran, May Grete; Sørland, Geir; Alvarez, Oscar (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 ... -
A Method for Analyzing Data from 1- and 2-Dimensional Relaxation and Diffusion NMR Experiments by Determination of their Expectation Values and Standard Deviations
Sørland, Geir; Anthonsen, Henrik Walbye; Simon, Sebastien Charles Roger (Journal article; Peer reviewed, 2024)A method for analyzing ill-posed multi-exponentially decaying data from 1- and 2-Dimensional experiments by Determination of the Expectation Values and their Standard Deviation has been developed. It combines a repeated ... -
New Nuclear Magnetic Resonance Approaches on the Evolution of Wax Mobility during Wax Crystallization
Savulescu, George Claudiu; Simon, Sebastien Charles; Sørland, Geir; Øye, Gisle (Peer reviewed; Journal article, 2021)Wax crystallization at low temperature is one of the main problems affecting flow assurance during oil production. Wax inhibitors, such as pour point depressants (PPDs), and crude oil components, such as asphaltenes, are ... -
A Robust Method for Analysing One and Two-Dimensional Dynamic NMR Data
Sørland, Geir; Anthonsen, Henrik Walbye; Ukkelberg, Åsmund; Zick, Klaus (Peer reviewed; Journal article, 2022)A new method combining Anahess and Inverse Laplace Transform, for analysing one- and two-dimensional dynamic NMR data has been developed. When using the Inverse Laplace Transform (ILT) algorithm only to generate solutions ... -
A theoretical and experimental investigation of batch oil-water gravity separation
Assar, Moein; Simon, Sebastien Charles Roger; Sørland, Geir; Grimes, Brian Arthur (Peer reviewed; Journal article, 2023)Gravity separation of oil-water emulsions is an industrially crucial process. Mechanistic models for a batch separation process can immensely be beneficial by linking emulsion experimental characterization to optimal ... -
Understanding the Effect of Asphaltenes and Wax Inhibitors on Wax Crystallization by Improved NMR Techniques
Savulescu, George-Claudiu; Øye, Gisle; Simon, Sebastien Charles Roger; Sørland, Geir (Journal article; Peer reviewed, 2023)Wax crystallization represents one of the main factors impacting flow assurance during oil production. Pour point depressants (PPDs) and asphaltenes present in crude oil have been linked to modifications in wax crystallization ...