Browsing SINTEF Open by Author "Almeida Carvalho, Patricia"
Now showing items 1-19 of 19
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Adhesion of mechanically and chemically dispersed crude oil droplets to eggs of Atlantic cod (Gadus morhua) and haddock (Melanogrammus aeglefinus)
Hansen, Bjørn Henrik; Sørensen, Lisbet; Almeida Carvalho, Patricia; Meier, Sonnich; Booth, Andy; Altin, Dag; Farkas, Julia; Nordtug, Trond (Journal article; Peer reviewed, 2018-11-01)Crude oil accidentally spilled into the marine environment undergoes natural weathering processes that result in oil components being dissolved into the water column or present in particulate form as dispersed oil droplets. ... -
Controlling the Electrical Properties of Reactively Sputtered High Entropy Alloy CrFeNiCoCu Films
Mayandi, Jeyanthinath; Finstad, Terje Gunnar; Stange, Marit Synnøve Sæverud; Vasquez, Geraldo Cristian; Sunding, Martin Fleissner; Løvvik, Ole Martin; Diplas, Spyridon; Almeida Carvalho, Patricia (Peer reviewed; Journal article, 2021)Oxide-containing films were made by reactively sputtering a high-entropy alloy target of CrFeCoNiCu. We report on a wide range of changes to the electrical properties made by different heat treatments in oxidizing and ... -
Crystallinity of silicon nanoparticles: Direct influence on the electrochemical performance of lithium ion battery anodes
Ulvestad, Asbjørn; Reksten, Anita; Andersen, Hanne Flåten; Almeida Carvalho, Patricia; Jensen, Ingvild Julie Thue; Nagell, Marius Uv; Mæhlen, Jan Petter; Kirkengen, Martin; Koposov, Alexey (Peer reviewed; Journal article, 2020)The use of silicon (Si) in the form of nanoparticles is one of the most promising routes for boosting the capacity of modern Li‐ion batteries. Many parameters influence the performance of Si making the comparison of materials ... -
Crystallinity of silicon nanoparticles: Direct influence on the electrochemical performance of lithium ion battery anodes
Ulvestad, Asbjørn; Reksten, Anita; Andersen, Hanne Flåten; Almeida Carvalho, Patricia; Jensen, Ingvild Julie Thue; Nagell, Marius Uv; Mæhlen, Jan Petter; Kirkengen, Martin; Koposov, Alexey (Peer reviewed; Journal article, 2020)The use of silicon (Si) in the form of nanoparticles is one of the most promising routes for boosting the capacity of modern Li‐ion batteries. Many parameters influence the performance of Si making the comparison of materials ... -
Formation of hydrogen bubbles in Pd-Ag membranes during H2 permeation
Peters, Thijs; Almeida Carvalho, Patricia; Stange, Marit Synnøve Sæverud; Bredesen, Rune (Peer reviewed; Journal article, 2019)Palladium membranes used for hydrogen separation seemingly develop cavities filled with hydrogen, i.e. hydrogen bubbles, along the grain boundaries. These bubbles may represent initial stages of pinhole formation that lead ... -
From quaternary to senary high entropy antimonide nanoparticles by a facile and scalable thermal treatment method
Soltani, Nayereh; Rahman, Jamil Ur; Almeida Carvalho, Patricia; Bazioti, Calliope; Finstad, Terje Gunnar (Peer reviewed; Journal article, 2022)Transition metal antimonides form a class of intermetallic compounds, which has drawn considerable attention due to their potential applications in various fields. However, the formation of nanostructures containing multiple ... -
Galvanic Deposition of Pt Nanoparticles on Black TiO2 Nanotubes for Hydrogen Evolving Cathodes
Touni, Aikaterini; Liu, Xin; Kang, Xiaolan; Almeida Carvalho, Patricia; Diplas, Spyridon; Both, Kevin Gregor; Sotiropoulos, Sotiris; Chatzitakis, Athanasios (Peer reviewed; Journal article, 2021)A galvanic deposition method for the in-situ formation of Pt nanoparticles (NPs) on top and inner surfaces of high-aspect-ratio black TiO2-nanotube electrodes (bTNTs) for true utilization of their total surface area has ... -
High entropy alloy CrFeNiCoCu sputter deposited films: Structure, electrical properties, and oxidation
Mayandi, Jeyanthinath; Schrade, Matthias; Vajeeston, Ponniah; Stange, Marit Synnøve Sæverud; Lind, Anna Maria; Sunding, Martin Fleissner; Deuermeier, Jonas; Fortunato, Elvira; Løvvik, Ole Martin; Ulyashin, Alexander; Diplas, Spyridon; Almeida Carvalho, Patricia; Finstad, Terje Gunnar (Peer reviewed; Journal article, 2022)High entropy alloy (HEA) films of CrFeCoNiCu were deposited by sputtering. Their structure was characterized and their electric transport properties were studied by temperature-dependent Hall and Seebeck measurements. The ... -
Immobilization of FeFe-hydrogenase on black TiO2 nanotubes as biocathodes for the hydrogen evolution reaction
Liu, Xin; Risbakk, Sanne; Almeida Carvalho, Patricia; Yang, Mingyi; Backe, Paul Hoff; Bjørås, Magnar; Norby, Truls; Chatzitakis, Athanasios (Peer reviewed; Journal article, 2022)Hydrogenases are attractive biocatalysts for utilization in electrochemical devices as potential replacement for Pt in hydrogen evolving electrodes. In this work, we investigate the immobilization of ferredoxin tagged ... -
Investigation of veryintenseD3-band emission in multi-crystalline silicon wafers using electron microscopy and hyperspectral photoluminescence imaging
Thøgersen, Annett; Jensen, Ingvild Julie Thue; Graff, Joachim Seland; Ringdalen, Inga Gudem; Almeida Carvalho, Patricia; Mehl, Torbjørn; Zhu, Junjie; Burud, Ingunn; Olsen, Espen; Søndenå, Rune (Peer reviewed; Journal article, 2022)Defects in high performance multi-crystalline silicon wafers can be detrimental to the lifetime of the solar cell. It is, therefore, important to study and understand the underlying structure and chemical elements present ... -
Monitoring and modelling of influent patterns, phase distribution and removal of 20 elements in two primary wastewater treatment plants in Norway
Farkas, Julia; Polesel, Fabio; Kjos, Marianne Steinsvik; Almeida Carvalho, Patricia; Ciesielski, Tomasz Maciej; Flores-Alsina, Xavier; Hansen, Steffen Foss; Booth, Andy (Journal article; Peer reviewed, 2020-07-10)Many small- or medium-sized communities in Northern Europe employ only primary wastewater treatment plants (WWTPs) and effluent discharges can be a relevant source of pollution. The current study combines monitoring and ... -
Occurrence, characterisation and fate of (nano)particulate Ti and Ag in two Norwegian wastewater treatment plants
Polesel, Fabio; Farkas, Julia; Kjos, Marianne Steinsvik; Almeida Carvalho, Patricia; Flores-Alsina, Xavier; Gernaey, Krist V.; Hansen, Steffen Foss; Plosz, Benedek; Booth, Andy (Journal article; Peer reviewed, 2018-09-15)Due to their widespread application in consumer products, elemental titanium (e.g., titanium dioxide, TiO2) and silver (Ag), also in nanoparticulate form, are increasingly released from households and industrial facilities ... -
Silicon powder-based wafers for low-cost photovoltaics: Laser treatments and nanowire etching
Jia, Guobin; Plentz, Jonathan; Gawlik, Annett; S. Azar, Amin; Stokkan, Gaute; Syvertsen, Martin; Almeida Carvalho, Patricia; Dellith, Jan; Dellith, Andrea; Andrä, Gudrun; Ulyashin, Alexander (Peer reviewed; Journal article, 2018)In this study, laser-treated polycrystalline Si (pc-Si) wafers, fabricated by wire sawing of hot-pressed ingots sintered from Si powder, have been investigated. As-cut wafers and those with high-quality thin Si layers ... -
Stability of beryllium coatings deposited on carbon under annealing up to 1073 K
Mateus, Rodrigo; Porosnicu, Corneliu; Franco, Noelia; Almeida Carvalho, Patricia; Lungu, Cristian Petricǎ; Alves, Eduardo (Journal article; Peer reviewed, 2019)Chemical reactions involving co-deposits in plasma facing components will occur under heat loads. Previous experiments in the Be-C-O system evidenced that compound formation may induce by itself the peel-off of deposits ... -
Synthesis, microstructure, and thermoelectric properties of Sb-Based high entropy alloys
Rahman, Jamil Ur; Almeida Carvalho, Patricia; Soltani, Nayereh; Schrade, Matthias; Gunnæs, Anette Eleonora; Finstad, Terje Gunnar (Peer reviewed; Journal article, 2022)In this paper, we explore the synthesis of new antimonide compounds based upon concepts of high entropy alloys (HEA). HEAs are usually multi-element (⪆5) alloys with near the equiatomic composition. They have been given ... -
Tailoring Upconversion and Morphology of Yb/Eu Doped Y2O3 Nanostructures by Acid Composition Mediation
Nunes, Daniela; Pimentel, Ana; Matias, Mariana; Freire, Tomas; Araujo, A; Silva, Filipe; Gaspar, Patricia; Garcia, Silvia; Almeida Carvalho, Patricia; Fortunato, Elvira; Martins, Rodrigo (Peer reviewed; Journal article, 2019)The present study reports the production of upconverter nanostructures composed by a yttrium oxide host matrix co-doped with ytterbium and europium, i.e., Y2O3:Yb3+/Eu3+. These nanostructures were formed through the ... -
Thermochemically stable ceramic compositemembranes based on Bi2O3 for oxygen separationwith high permeability
Xing, Wen; Almeida Carvalho, Patricia; Polfus, Jonathan M.; Li, Zuoan (Journal article; Peer reviewed, 2019)Ceramic oxygen separation membranes can be utilized to reduce CO2 emissions in fossil fuel power generation cycles based on oxy-fuel combustion. State-of-the-art oxygen permeable membranes based on Ba0.5Sr0.5Co0.8Fe0.2O3−δ ... -
Thin films made by reactive sputtering of high entropy alloy FeCoNiCuGe: Optical, electrical and structural properties
Mayandi, Jeyanthinath; Finstad, Terje Gunnar; Dahl, Øystein; Ponniah, Vajeeston; Schrade, Matthias; Løvvik, Ole Martin; Diplas, Spyridon; Almeida Carvalho, Patricia (Peer reviewed; Journal article, 2022)Films were reactively sputtered from a high entropy alloy (HEA) FeCoNiCuGe target in an Ar/O2 plasma. The case of zero O2 gas flow yielded HEA films of FeCoNiCuGe. These as-deposited HEA films have a face centered cubic ... -
Wastewater-aged silver nanoparticles in single and combined exposures with titanium dioxide affect the early development of the marine copepod Tisbe battagliai
Georgantzopoulou, Anastasia; Farkas, Julia; Ndungu, Kuria; Coutris, Claire; Almeida Carvalho, Patricia; Booth, Andy; Macken, Ailbhe (Peer reviewed; Journal article, 2020)In this study, the effects of aged Ag and TiO2 NPs, individually and as a mixture, in wastewater relative to their pristine counterparts on the development of the copepod nauplii (Tisbe battagliai) were investigated. NP ...