Blar i Øvrige samlinger på tidsskrift "Langmuir"
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A SERS Study on the Assembly Behavior of Gold Nanoparticles at Oil/Water Interface
(Journal article; Peer reviewed, 2015)Herein, the assembly behavior of gold nanoparticles (AuNPs) at the oil/water interface is studied by surface-enhanced Raman scattering (SERS) spectroscopy. Two selected chemicals [1-dodecanethiol (DDT) and tetramethylammonium ... -
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 ... -
Association with Imidazole in the Cooperative Order–Disorder Transition in Aqueous Solution of Schizophyllan
(Peer reviewed; Journal article, 2022)Schizophyllan, a triple helical polysaccharide, exhibits cooperative order–disorder transition (CODT) in aqueous solutions. The transition transforms the ordered structure (triple helix I) formed between the branched side ... -
Atomistic insights into the droplet size evolution during self-microemulsification
(Peer reviewed; Journal article, 2022)Microemulsions have been attracting great attention for their importance in various fields including nanomaterials fabrication, food industry, drug delivery, and enhanced oil recovery. Atomistic insights into the ... -
Carbon-sulfur bond cleavage during adsorption of octadecane thiol to copper in ethanol
(Journal article; Peer reviewed, 2019)The effect of the solvent on the formation of thiol self-assembled monolayers (SAMs) on oxide-covered, reactive metals is more involved than in the well-studied gold–thiol system. In this work, copper covered with a native ... -
CO2 Adsorption Enhanced by Tuning the Layer Charge in a Clay Mineral
(Peer reviewed; Journal article, 2021)Due to the compact two-dimensional interlayer pore space and the high density of interlayer molecular adsorption sites, clay minerals are competitive adsorption materials for carbon dioxide capture. We demonstrate that ... -
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 ... -
Intercalation of CO2 Selected by Type of Interlayer Cation in Dried Synthetic Hectorite
(Peer reviewed; Journal article, 2023)Clay minerals are abundant in caprock formations for anthropogenic storage sites for CO2, and they are potential capture materials for CO2 postcombustion sequestration. We investigate the response to CO2 exposure of dried ... -
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 ... -
Oxygen-Controlled Phase Segregation in Poly(N-isopropylacrylamide)/Laponite Nanocomposite Hydrogels
(Journal article; Peer reviewed, 2013) -
Pretreatment with a β-cyclodextrin - corrosion inhibitor complex stops an initiated corrosion process on zinc
(Journal article; Peer reviewed, 2018)Metal pretreatment is typically the first step in a reliable corrosion protection system. This work explores the incorporation of complexes between the cyclic oligosaccharide β-cyclodextrin (β-CD) and the molecular organic ... -
Selective Vacuum Evaporation by the Control of the Chemistry of Gas Phase in Vacuum Refining of Si
(Peer reviewed; Journal article, 2021)The evaporation of P from liquid Si under vacuum and reduced pressures of H2, He, and Ar was studied to evaluate the feasibility of effective P removal with insignificant Si loss. It was found that the introduction of Ar ... -
Solvent-Mediated Forces between Ellipsoidal Nanoparticles Adsorbed at Liquid–Vapor Interfaces
(Peer reviewed; Journal article, 2020)Classical capillary theory predicts that a non-neutrally wetting ellipsoidal particle adsorbed at a liquid–vapor interface will deform the interface. The deformation gives rise to anisotropic capillary forces of a quadrupolar ... -
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 ... -
Thermodynamic stability of volatile droplets and thin films governed by the disjoining pressure in open and closed containers
(Peer reviewed; Journal article, 2020)Distributed thin films of water and their coexistence with droplets are investigated using a capillary description based on a thermodynamic fundamental relation for the film Helmholtz energy, derived from disjoining pressure ... -
Unraveling adhesion strength between gas hydrate and solid surfaces
(Peer reviewed; Journal article, 2021)Natural gas hydrate is a promising future energy source, but it also poses a huge threat to oil and gas production due to its ability to deposit within and block pipelines. Understanding the atomistic mechanisms of adhesion ... -
Unraveling Ice–Solid Interface Rupture Dynamics: Insights from Molecular Dynamics Simulations
(Peer reviewed; Journal article, 2024)Unwanted icing on exposed surfaces poses significant risks, driving the quest for effective anti-icing mechanisms. While fracture mechanics concepts have been developed for designing coatings that weaken the ice–solid ...