Browsing Det matematisk-naturvitenskapelige fakultet by Title

Now showing items 792-811 of 838

  • Transitioning from Methanol to Olefins (MTO) toward a Tandem CO2 Hydrogenation Process: On the Role and Fate of Heteroatoms (Mg, Si) in MAPO-18 Zeotypes 
    Cordero Lanzac, Tomas; Capel Berdiell, Izar; Airi, Alessia; Chung, Sang-Ho; Mancuso, Jenna; Redekop, Evgeniy; Fabris, Claudia; Figueroa-Quintero, Leidy; Navarro, Juan Carlos (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2024)
    The tandem CO2 hydrogenation to hydrocarbons over mixed metal oxide/zeolite catalysts (OXZEO) is an efficient way of producing value-added hydrocarbons (platform chemicals and fuels) directly from CO2 via methanol intermediate ...
  • Trap-limited diffusion of Zn in β−Ga2O3 
    Hommedal, Ylva Knausgård; Frodason, Ymir Kalmann; Vines, Lasse; Johansen, Klaus Magnus H (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Diffusion of Zn in (001)- and (¯201)-oriented β−Ga2O3 was studied using secondary-ion mass spectrometry and first-principles calculations based on hybrid and semilocal functionals. The β−Ga2O3 samples were sealed in quartz ...
  • Trapping of active Brownian and run-and-tumble particles: A first-passage time approach 
    Moen, Emily Qing Zang; Olsen, Kristian Stølevik; Rønning, Jonas; Angheluta, Luiza (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    We use a first-passage time approach to study the statistics of the trapping times induced by persistent motion of active particles colliding with flat boundaries. The angular first-passage time distribution and mean ...
  • Trapping of multiple H atoms at the Ga(1) vacancy in b-Ga2O3 
    Fowler, W. Beall; Stavola, Michael; Qin, Ying; Weiser, Philip Michael (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Recent suggestions that hydrogen incorporation at the Ga(1) vacancy in β-Ga2O3 may have an impact on its electronic properties have led us to extend our earlier work on these defects. While our previous work provides strong ...
  • Truth is, we all are transients: A perspective on the time-dependent nature of reactions and those who study them 
    Redekop, Evgeniy; Yablonsky, Gregory S.; Gleaves, John T. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Understanding and mastery of Transient Kinetics in the context of multi-scale transport-reaction systems employed in catalysis is one of the ultimate frontiers in chemical science and engineering. In this perspective, we ...
  • Tuning defect-related optical bands by channeling implants in semiconductors 
    Azarov, Alexander; Galeckas, Augustinas; Ling, Francis Chi-Chung; Kuznetsov, Andrej (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2023)
    Abstract Ion implantation is an excellent method to introduce defects into semiconductors, extending their functionalities in a controllable way. Herein, we investigated an option to use crystallographically ...
  • Tuning electrical properties in Ga2O3 polymorphs induced with ion beams 
    Polyakov, A.Y.; Kochkova, A.I.; Azarov, Alexander; Venkatachalapathy, Vishnukanthan; Miakonkikh, A.V.; Vasilev, A.A.; Chernykh, A.V.; Shchemerov, I.V.; Romanov, A.A.; Kuznetsov, Andrej; Pearton, S.J. (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2023)
    Ion beam fabrication of metastable polymorphs of Ga2O3, assisted by the controllable accumulation of the disorder in the lattice, is an interesting alternative to conventional deposition techniques. However, the adjustability ...
  • Tuning the Casimir-Lifshitz force with gapped metals 
    Boström, Mathias; Rizwan Khan, M.; Gopidi, H. R.; Brevik, Iver Håkon; Li, Y.; Persson, Clas; Malyi, O. I. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    The Casimir-Lifshitz interaction, a long-range force that arises between solids and molecules due to quantum fluctuations in electromagnetic fields, has been widely studied in solid-state physics. The degree of polarization ...
  • Tuning the Magnetically Segregated Nanolayering in Mn–Ni–As Intermetallics 
    Gonano, Bruno Raymond Gino; Fjellvåg, Øystein; Steciuk, Gwladys; Guillou, Francois; Saha, Dipankar; Pelloquin, Denis; Fjellvåg, Helmer (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    2D materials exhibiting alternating ferro- and non-ferromagnetic layers are highly sought due to their potential for applications. In this work, we demonstrate, through the use of robust methodology, the existence of ...
  • Tuning the material and catalytic properties of SUZ-4 zeolites for the conversion of methanol or methane 
    Dyballa, Michael Martin; Pappas, Dimitrios; Borfecchia, Elisa; Beato, Pablo; Olsbye, Unni; Lillerud, Karl Petter; Arstad, Bjørnar; Svelle, Stian (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
    This work describes the synthesis and investigation of improved SUZ-4 catalysts (SZR framework) and their application in methanol-to-olefins and methane-to-methanol conversion. We report boron containing, dealuminated and ...
  • Twinning in Zr-Based Metal-Organic Framework Crystals 
    Øien-Ødegaard, Sigurd; Lillerud, Karl Petter (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Ab initio structure determination of new metal-organic framework (MOF) compounds is generally done by single crystal X-ray diffraction, but this technique can yield incorrect crystal structures if crystal twinning is ...
  • Two different approaches of microbial community structure characterization in riverine epilithic biofilms under multiple stressors conditions: Developing molecular indicators 
    Pin, Lorenzo; Eiler, Alexander; Fazi, Stefano; Friberg, Nikolai (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Microbial communities are major players in the biogeochemical processes and ecosystem functioning of river networks. Despite their importance in the ecosystem, biomonitoring tools relying on prokaryotes are still lacking. ...
  • Two-Step Dry Gel Method Produces MgAPO-11 with Low Aspect Ratio and Improved Catalytic Performance in the Conversion of Methanol to Hydrocarbons 
    Zhang, Lina; Firth, Daniel Sean; Olsbye, Unni; Bao, Xiaojun (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    In this article, the synthesis, characterization and catalytic performance of three MgAPO-11 catalysts with distinct crystal morphologies (sunflower, ball and candy) are presented. Among the three samples, the candy-like ...
  • Ultralow amounts of DNA from long-term archived serum samples produce high-quality methylomes 
    Wojewodzic, Marcin W; Leithaug, Magnus; Lauritzen, Marianne; Lyle, Robert; Haglund, Sofia; Rubin, Carl-Johan; Ewels, Philip A; Grotmol, Tom; Rounge, Trine B (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Background Long-term stored serum is considered challenging for epigenomic analyses: as there are no cells, circulating DNA is scarce, and amplification removes epigenetic signals. Additionally, pre-analytical ...
  • Understanding C-H activation in light alkanes over Cu-MOR zeolites by coupling advanced spectroscopy and temperature-programmed reduction experiments 
    Kvande, Karoline; Garetto, Beatrice; Deplano, Gabriele; Signorile, Matteo; Solemsli, Bjørn Gading; Prodinger, Sebastian; Olsbye, Unni; Beato, Pablo; Bordiga, Silvia; Svelle, Stian; Borfecchia, Elisa (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    The direct activation of methane to methanol (MTM) proceeds through a chemical-looping process over Cu-oxo sites in zeolites. Herein, we extend the overall understanding of oxidation reactions over metal-oxo sites and C–H ...
  • Understanding phase separation in ZnCdO by a combination of structural and optical analysis 
    Venkatachalapathy, Vishnukanthan; Galeckas, Augustinas; Trunk, Mareike; Zhang, Tianchong; Azarov, Alexander; Kuznetsov, Andrej (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2011)
    A phenomenon of wurtzite (w), zincblende (zb), and rock-salt (rs) phase separation was investigated in ZnCdO films having Cd contents in the range of 0%–60% settling a discussion on the phase stability issues in ZnCdO. ...
  • Understanding the (De)Sodiation Mechanisms in Na‐Based Batteries through Operando X‐Ray Methods 
    Brennhagen, Anders; Cavallo, Carmen; Wragg, David; Sottmann, Jonas; Koposov, Alexey; Fjellvåg, Helmer (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Progress in the field of Na‐based batteries strongly relies on the development of new advanced materials. However, one of the main challenges of implementing new electrode materials is the understanding of their mechanisms ...
  • Understanding the optical properties of ZnO1−xSx and ZnO1−xSex alloys 
    Baldissera, Gustavo; Persson, Clas (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
    ZnO1−xYx with chalcogen element Y exhibits intriguing optoelectronic properties as the alloying strongly impacts the band-gap energy Eg(x). In this work, we analyze and compare the electronic structures and the dielectric ...
  • Universal radiation tolerant semiconductor 
    Azarov, Alexander; García Fernández, Javier; Zhao, Junlei; Djurabekova, Flyura; He, Huan; He, Ru; Prytz, Øystein; Vines, Lasse; Bektas, Umutcan; Chekhonin, Paul; Klingner, Nico; Hlawacek, Gregor; Kuznetsov, Andrej (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Abstract Radiation tolerance is determined as the ability of crystalline materials to withstand the accumulation of the radiation induced disorder. Nevertheless, for sufficiently high fluences, in all by far known ...
  • Unraveling electronic band structure of narrow-bandgap p-n nanojunctions in heterostructured nanowires 
    Zamani, Reza R.; Hage, Fredrik S.; Eljarrat, Alberto; Namazi, Luna; Ramasse, Quentin M.; Dick, Kimberly A. (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)
    Direct comparison of bandgaps of GaSb zinc blende and wurtzite polytypes (0.75 and 0.84 eV, respectively) by means of valence electron energy-loss spectroscopy (VEELS) in a transmission electron microscope (TEM).