Fredrik Sydow Hage

• Leon_Valido, Dario Alejandro; Elgvin, Cana; Nguyen, Phuong Dan; Prytz, Øystein; Hage, Fredrik Sydow & Berland, Kristian (2024). Unraveling many-body effects in ZnO: Combined study using momentum-resolved electron energy-loss spectroscopy and first-principles calculations. Physical review B (PRB). ISSN 2469-9950. 109(11). doi: 10.1103/PhysRevB.109.115153.
• Huang, Haoliang; T.C. Hayes, Edward; Gianolio, Diego; Cibin, Giannantonio; Hage, Fredrik Sydow & Ramasse, Quentin [Vis alle 7 forfattere av denne artikkelen] (2021). Role of SnO2 in the Bifunctional Mechanism of CO Oxidation at Pt-SnO2 Electrocatalysts. ChemElectroChem. ISSN 2196-0216. 8(13), s. 2572–2582. doi: 10.1002/celc.202100642. Fulltekst i vitenarkiv
• Dimitrievska, Mirjana; Hage, Fredrik Sydow; Escobar Steinvall, Simon; P. Litvinchuk, Alexander; Z. Stutz, Elias & Ramasse, Quentin M. [Vis alle 7 forfattere av denne artikkelen] (2021). The Advantage of Nanowire Configuration in Band Structure Determination. Advanced Functional Materials. ISSN 1616-301X. 31(41). doi: 10.1002/adfm.202105426. Fulltekst i vitenarkiv
• Zamani, Reza R.; Hage, Fredrik S.; Eljarrat, Alberto; Namazi, Luna; Ramasse, Quentin M. & Dick, Kimberly A. (2021). Unraveling electronic band structure of narrow-bandgap p-n nanojunctions in heterostructured nanowires. Physical Chemistry, Chemical Physics - PCCP. ISSN 1463-9076. 23(44), s. 25019–25023. doi: 10.1039/d1cp03275e. Fulltekst i vitenarkiv
• Strandbakke, Ragnar; Dyrlie, Oddvar; Hage, Fredrik Sydow & Norby, Truls (2016). Reaction kinetics of protons and oxide ions in LSM/lanthanum tungstate cathodes with Pt nanoparticle activation. Journal of the Electrochemical Society. ISSN 0013-4651. 163(6), s. F507–F515. doi: 10.1149/2.0881606jes.
• Mauroy, Henrik; Plivelic, Tomás S.; Suuronen, Jussi-Petteri; Hage, Fredrik Sydow; Fossum, Jon Otto & Knudsen, Kenneth Dahl (2015). Anisotropic clay-polystyrene nanocomposites: Synthesis, characterization and mechanical properties. Applied Clay Science. ISSN 0169-1317. 108, s. 19–27. doi: 10.1016/j.clay.2015.01.034. Vis sammendrag

  Recent studies on clay–polymer nanocomposites have shown prominent improvements in thermal and mechanical properties with the addition of quite small amounts of nanometer sized clay particles. The present work presents characterization of anisotropic clay–polystyrene nanocomposites synthesized via a guided self-assembly technique, employing electric fields to align the clay particles into chain-like structures inside the polymer matrix. Four different kinds of surface modified clay were used as particle additives, namely Hectorite, Laponite, Na-Montmorillonite and Li-Fluorohectorite. The microstructure of the nanocomposites was examined with wide angle X-ray scattering (WAXS), X-ray computed microtomography (XMT) and transmission electron microscopy (TEM). Thermogravimetric analysis (TGA) was further employed to examine the high-temperature resilience of the nanocomposites before determination of the mechanical properties during compression. The results showed that the nanocomposites were of the intercalated type with the clay dispersed as ~ 15–70 nm thick crystallites which in turn aggregated into micrometer sized particles. Alignment of the clay particles into chains inside the polymer matrix led to differences in mechanical properties compared to nanocomposites having a random orientation of the clay particles. In particular the aligned polystyrene–fluorohectorite nanocomposite displayed large improvements compared to its non-aligned counterpart. It was also observed that differences in yield strength depended on the compression direction.

• Cernák, Jozef; Helgesen, Geir; Hage, Fredrik Sydow & Kovác, Jozef (2014). Magnetoresistance of composites based on graphitic discs and cones. Journal of Physics D: Applied Physics. ISSN 0022-3727. 47(33). doi: 10.1088/0022-3727/47/33/335305.
• Wenner, Sigurd; Marioara, Calin Daniel; Lefebvre, Williams; Ramasse, Quentin; Kepaptsoglou, Despoina Maria & Hage, Fredrik Sydow [Vis alle 7 forfattere av denne artikkelen] (2014). Atomic-resolution elemental mapping of precipitates in a 7449 aluminium alloy. Materials Science Forum. ISSN 0255-5476. 794-796, s. 63–67. doi: 10.4028/www.scientific.net/MSF.794-796.63. Fulltekst i vitenarkiv Vis sammendrag

  The high-strength weldable 7xxx series of aluminium alloys are of great importance to the aeronautics industry. Only recently, the complex structures of the AlZnMg hardening precipitates have been solved by HAADFSTEM imaging and first-principles calculations. However, perfect models of precipitate structures are often insufficient as several elements may be mixed into precipitate compositions. We have investigated this effect by STEMEELS spectrum imaging with an aberration-corrected microscope. In a 7449 alloy, Cu and Al were found to replace atoms at certain sites in both metastable and equilibrium ZnMg precipitates.

• Hage, Fredrik Sydow; Kepaptsoglou, Despoina Maria; Seabourne, Ché Royce; Ramasse, Quintim M.; Scott, Andrew J. & Prytz, Øystein [Vis alle 8 forfattere av denne artikkelen] (2014). Dielectric response of pentagonal defects in multilayer graphene nano-cones. Nanoscale. ISSN 2040-3364. 6(3), s. 1833–1839. doi: 10.1039/c3nr05419e.
• Wenner, Sigurd; Marioara, Calin Daniel; Ramasse, Quentin; Kepaptsoglou, Despoina Maria; Hage, Fredrik Sydow & Holmestad, Randi (2014). Atomic-resolution electron energy loss studies of precipitates in an Al-Mg-Si-Cu-Ag alloy. Scripta Materialia. ISSN 1359-6462. 74(March), s. 92–95. doi: 10.1016/j.scriptamat.2013.11.007. Fulltekst i vitenarkiv Vis sammendrag

  Aberration-corrected scanning transmission electron microscopy combined with electron energy loss spectroscopy has been used to determine the distribution of Cu and Ag atomic columns of precipitates in an Al–Mg–Si–Cu–Ag alloy. Cu columns were commonly part of C and Q′ phases, with the atomic columns having large projected separations. Columns containing Ag were more tightly spaced, in areas lacking repeating unit cells and at incoherent precipitate–host lattice interfaces. Cu-rich and Ag-rich areas were not found to intermix.

• Hage, Fredrik Sydow; Ramasse, Quentin; Kepaptsoglou, Despoina Maria; Prytz, Øystein; Gunnæs, Anette Eleonora & Helgesen, Geir [Vis alle 7 forfattere av denne artikkelen] (2013). Topologically induced confinement of collective modes in multilayer graphene nanocones measured by momentum-resolved STEM-VEELS. Physical Review B. Condensed Matter and Materials Physics. ISSN 1098-0121. 88(15). doi: 10.1103/PhysRevB.88.155408.
• Sartori, Sabrina; Knudsen, Kenneth; Hage, Fredrik Sydow; Heyn, Richard H; Bardaji, Elisa Gil & Zhao-Karger, Zhirong [Vis alle 8 forfattere av denne artikkelen] (2012). Influence of nanoconfinement on morphology and dehydrogenation of the LiBD4-B-11-Mg(BD4-B-11)2 system. Nanotechnology. ISSN 0957-4484. 23(25). doi: 10.1088/0957-4484/23/25/255704. Vis sammendrag

  The decomposition of a nanoconfined mixture of lithium–magnesium borohydride, Li11BD4–Mg(11BD4)2, has been investigated and compared to the corresponding mixture in the bulk form. The systems were investigated by thermal analysis, small-angle neutron scattering, 11B nuclear magnetic resonance and transmission electron microscopy. The dehydrogenation temperatures decreased by up to 60 °C in the nanoconfined system, with gas evolution following different steps, compared to the behaviour of the bulk material under the same conditions. Most importantly, desorption from the nanoconfined hydride proceeds without formation of diborane, B2D6, which evolves from the bulk mixture. From small-angle neutron scattering, differences in morphology between the bulk and the nanoconfined systems are also demonstrated. Evidence of a complete decomposition has been found in the nanoconfined system, after heating up to 460 °C. Furthermore, 11B NMR data show that nanoconfinement inhibits the formation of dodecaborane, [B12D12]2−, during decomposition, a result which is important for practical applications of borohydrides.

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• Hage, Fredrik Sydow (2022). Nanoscale map of vibrational dynamics. Nature. ISSN 0028-0836. 606, s. 252–253. doi: 10.1038/d41586-022-01533-1.
• Bazioti, Kalliopi; Kneiβ, Max; Wenckstern, Holger von; Hage, Fredrik Sydow & Prytz, Øystein (2022). Band Gap Measurements by VEELS of novel κ-(Al0.2Ga0.8)2O3/ κ-(In0.25Ga0.75)2O3 superlattices .
• Wenner, Sigurd; Marioara, Calin Daniel; Lefebvre, Williams; Ramasse, Quentin; Kepaptsoglou, Despoina Maria & Hage, Fredrik Sydow [Vis alle 7 forfattere av denne artikkelen] (2014). Atomic-resolution elemental mapping of precipitates in a 7449 aluminium alloy.
• Hage, Fredrik Sydow (2011). Carbon Nanocones and Nanodiscs Studied by Transmission Electron Microscopy.
• Svåsand, Eldrid; Cortes, A; Celedon, C; Hage, Fredrik Sydow; Lavayen, V & Häberle, P (2010). Metal Decoration of Conical and Disc Shaped Carbon Structures.
• Hage, Fredrik Sydow; Helgesen, Geir; Gunnæs, Anette Eleonora & Prytz, Øystein (2010). Graphitization of carbon nanocones and nanodiscs.
• Hage, Fredrik Sydow (2013). The electronic structure and morphology of carbon fullerene nano-scones: an electron energy loss spectroscopy study. Det matematisk naturvitenskapelige fakultet.

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