Sissel Jørgensen

• Hansen, Eddy Walther; Jobby, Paul; Jørgensen, Sissel; Arstad, Bjørnar & Bouzga, Aud Mjærum (2011). Quantitative determination of comonomer content in ethene-1-hexene copolymers by solid state 1H-MAS NMR. International Journal of Research Reviews in Applied Sciences. ISSN 2076-734X. 6(4), p. 382–390. Show summary

  1H-MAS NMR is shown to be a powerful and attractive technique for quantifying the comonomer content in ethene--alkene copolymers, as exemplified by a series of ethene--hexene copolymers. The main advantages of applying 1H-MAS solid-state NMR are related to; a) the very short experimental sampling time, on the order of a few minutes b) the bypass of sample preparation, as compared to traditional high-resolution liquid-state 13C-NMR which necessitates a high temperature (1300C) preparation period of days, or even weeks, c) no thermal sample treatment and d) no need for calibration. In particular, it will be shown that the technique allows the comonomer content of cross-linked LDPE to be probed, which is generally difficult, or impossible, by solution-state NMR since these polymers are mostly non-soluble.

• Truong, Thuy le; Larsen, Åge; Holme, Børge; Diplas, Spyridon; Hansen, Finn Knut & Roots, Jaan (2010). Dispersibility of silane-functionalized alumina nanoparticles in syndiotactic polypropylene. Surface and Interface Analysis. ISSN 0142-2421. 42(6-7), p. 1046–1049. doi: 10.1002/sia.3166.
• Diplas, Spyridon; Knutsen, T; Jørgensen, Sissel; Gunnæs, Anette Eleonora; Våland, T. & Norby, Truls [Show all 8 contributors for this article] (2008). An experimental study of the electronic structure of anodically grown films on an amorphous Ni78Si8B14 alloy. Surface and Interface Analysis. ISSN 0142-2421. 40(3-4), p. 826–829. doi: 10.1002/sia.2748.
• Knutsen, Turid; Diplas, Spyros; Våland, Torstein; Jørgensen, Sissel & Norby, Truls (2007). A study of anodically grown hydroxide films on an amorphous Ni78Si8B14 alloy. Journal of the Electrochemical Society. ISSN 0013-4651. 154(6). Show summary

  Films grown on amorphous Ni78Si8B14 alloy and on polycrystalline Ni by polarization in 1 M KOH solution were analyzed by X-ray photoelectron spectroscopy (XPS) and scanning tunneling spectroscopy (STS). XPS investigations showed that the films formed on both the amorphous Ni78Si8B14 alloy and polycrystalline Ni at open-circuit potential and after polarization at 0.4 V-RHE consist of Ni(OH)(2), while the films formed after polarization at 0.5 V-RHE consist of NiOOH. No traces of B or Si in the uppermost of the hydroxide films produced on the amorphous Ni78Si8B14 alloy were found. STS showed that all films formed on the amorphous Ni78Si8B14 had more n-type semiconductor character than those formed on polycrystalline Ni. Electrochemical investigations indicated that the amorphous Ni78Si8B14 alloy is a better electrocatalyst for the oxygen evolution reaction than polycrystalline Ni. We discuss whether this can be attributed to an enhanced electron density on the Ni sites in the alloy leading to an increase in the tunneling probability of the electrons on the surface film. This can subsequently enhance its catalytic action towards the oxygen evolution reaction. (c) 2007 The Electrochemical Society.

• Diplas, Spyridon; Ulyashin, Alexander; Maknys, Kestutis; Gunnæs, Anette Eleonora; Jørgensen, Sissel & Watts, J.F. [Show all 9 contributors for this article] (2007). On the processing-structure-property relationship of ITO layers deposited on crystalline and amorphous Si. Thin Solid Films. ISSN 0040-6090. 515, p. 8539–8543. doi: 10.1016/j.tsf.2007.03.091. Show summary

  Indium-tin-oxide(ITO)antireflection coatings were deposited on crystalline Si(c-Si), amorphoushydrogenatedSi(a-Si:H)and glass substrates at room temperature(RT), 160 °C and 230 °C by magnetron sputtering. The films were characterised using atomic force microscopy, transmission electron microscopy, angle resolved X-ray photoelectron spectroscopy, combined with resistance and transmittance measurements. The conductivity and refractive index as well as the morphology of the ITO films showed a significant dependence on the processing conditions. The films deposited on the two different Si substrates at higher temperatures have rougher surfaces compared to the RT ones due to the development of crystallinity and growth of columnar grains.

• Virnovskaia, Anastasia; Jørgensen, Sissel; Hafizovic, Jasmina; Prytz, Øystein; Kleimenov, E & Havecker, M [Show all 10 contributors for this article] (2007). In situ XPS investigation of Pt(Sn)/Mg(Al)O catalysts during ethane dehydrogenation experiments. Surface Science. ISSN 0039-6028. 601, p. 30–43. doi: 10.1016/j.susc.2006.09.002.
• Knutsen, T; Diplas, Spyridon; Valand, T; Jørgensen, Sissel & Norby, Truls (2007). A study of anodically grown hydroxide films on an amorphous Ni78Si8B14 alloy. Journal of the Electrochemical Society. ISSN 0013-4651. 154. doi: 10.1149/1.2721765.
• Chebotareva, AB; Untila, GG; Kost, TN; Jørgensen, Sissel & Ulyashin, AG (2007). ITO deposited by pyrosol for photovoltaic applications. Thin Solid Films. ISSN 0040-6090. 515, p. 8505–8510. doi: 10.1016/j.tsf.2007.03.097.
• Diplas, Spyridon; Jørgensen, Sissel; Taftø, Johan; Tønnessen, Trine; Knutsen, Turid & Lehrmann, Jens [Show all 9 contributors for this article] (2006). Probing the electronic structure of Ni-X, (X = B, S, P) catalysts with XPS. Surface and Interface Analysis. ISSN 0142-2421. 38, p. 238–242. Show summary

  Amorphous films of Ni-B, Ni-P and Ni-S were produced by electrodeposition on pure polycrystalline Ni. The films were studied with X-ray photoelectron spectroscopy (XPS). Changes in the Auger parameter (AP), peak energy shifts and changes in the Ni 2p shake up satellite intensity and energy were used to probe the electronic changes occurring upon alloying Ni with P, S and B. It is suggested that the Ni sites experience a higher electron density in the alloys than in the pure element and this could be the reason for the increased catalytic activity. Copyright (C) 2006 John Wiley & Sons, Ltd.

• Heng, Chenglin; Li, Yanjun; Mayandi, Jeyanthinath; Finstad, Terje; Jørgensen, Sissel & Gunnæs, Anette Eleonora [Show all 8 contributors for this article] (2006). A study on the precipitation of Ge-rich nanoparticles in a luminescent (Er, Ge) co-doped SiO2 film sputtered with Ar+O2 plasma. International Journal of Nanoscience. ISSN 0219-581X. 5(4-5), p. 493–498. doi: 10.1142/S0219581X06004681. Show summary

  We report the photoluminescence (PL) from an (Er, Ge) co-doped SiO2 film deposited by rf-magnetron sputtering in an Ar + O2 ambience. The sample film was annealed in N2 for 30 min at different temperatures. The PL intensity increases as the annealing temperature increases from 700 to 1000°C, and drops to very weak after 1100°C annealing. High-resolution transmission electron microscopy (TEM) observation shows that there are some Ge-rich nanoparticles precipitated after 700°C annealing, and more clusters precipitated after 1000°C annealing. However, no Ge nanocrystals were found in these films, the diffraction patterns are always halo which indicates that the precipitated clusters are in amorphous states. X-ray photoelectron spectroscopy (XPS) analysis indicates the Ge in the nanoclusters is mostly in an oxidized state and the oxidation state of Er increases with increasing annealing temperature.

• Diplas, Spyridon; Jørgensen, Sissel; Taftø, Johan; Tønnessen, Trine; Knutsen, Turid & Lehrmann, J [Show all 9 contributors for this article] (2006). Probing the electronic structure of Ni-X, (X = B, S, P) catalysts with XPS. Surface and Interface Analysis. ISSN 0142-2421. 38.
• Diplas, Spyridon; Lehrmann, J; Jørgensen, Sissel; Valand, T & Taftø, Johan (2005). (A) study of the alloying behaviour of Ni-B amorphous catalysts using Auger parameter measurements, and primary and secondary features of the XPS spectrum. Philosophical Magazine. ISSN 1478-6435. 85.
• Diplas, Spyridon; Lehrmann, J; Jørgensen, Sissel; Valand, T; Watts, JF & Taftø, Johan (2005). Characterization of Ni-B amorphous alloys with x-ray photoelectron and secondary ion mass spectroscopy. Surface and Interface Analysis. ISSN 0142-2421. 37, p. 459–465.
• Tyholdt, Frode; Gunnæs, Anette Eleonora; Jørgensen, Sissel & Fjellvåg, Helmer (2005). Synthesis of Oriented BiFeO3 thin films by chemical solution deposition: Phase, texture, and microstructural development. Journal of Materials Research. ISSN 0884-2914. 20(8), p. 2127–2139.
• Glenne, Rita; Horst, Jens Anton; Jørgensen, Sissel & Seiersten, Marion (2004). XPS and SEM studies of Ca- and Ni-substituted LaCrO3 after quenching from reducing and oxidizing atmospheres at 800 °C. Surface and Interface Analysis. ISSN 0142-2421. 11(1-12), p. 275–279.
• Marstein, Erik Stensrud; Gunnæs, Anette Eleonora; Serincan, U.; Jørgensen, Sissel; Olsen, Arne & Turan, Rasit [Show all 7 contributors for this article] (2003). Mechanisms of void formation in Ge implanted SiO2 films. Nuclear Instruments and Methods in Physics Reseach B. ISSN 0168-583X. 207(4), p. 424–433.
• Khyzhun, Oleg; Lototsky, M.V.; Riabov, A. B.; Rosenkilde, C.; Yartys, V.A. & Jørgensen, Sissel [Show all 7 contributors for this article] (2003). Sn-containing(La,Mm)Ni_5-xSn_xH_5-6 intermetallic hydrides: thermodynamic, structural and kinetic properties. Journal of Alloys and Compounds. ISSN 0925-8388. p. 773–778.
• Jørgensen, Sissel; Horst, Jens Anton; Dyrlie, Oddvar; Larring, Yngve; Ræder, Henrik & Norby, Truls Eivind (2002). XPS surface analyses of LaPO₄ ceramics prepared by precipitation with and without excess of PO₄^3-. Surface and Interface Analysis. ISSN 0142-2421. 34, p. 306–310.
• Tyholdt, Frode; Horst, Jens Anton; Jørgensen, Sissel; Østvold, Thomas & Norby, Truls Eivind (2000). Segregation of Sr in Sr-doped LaPO<SUB>4</SUB> ceramics. Surface and Interface Analysis. ISSN 0142-2421. 30, p. 95–97.
• Wilhelms, A; Patience, R.L. & Jørgensen, Sissel (1992). Nitrogen functionality distributions in asphaltenes isolated from several oils from different source rock types. Geochimica et Cosmochimica Acta. ISSN 0016-7037. 56(10), p. 3745–3750.

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• Jørgensen, Sissel & Gunnæs, Anette Eleonora (2003). Proceedings Scandem 2003. SCANDEM. 160 p.

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• Lerum, Hans Vigeland; Bouzga, Aud Mjærum; Jørgensen, Sissel; Petersen, Dirk; Eriksen, Dag Øistein & Hansen, Eddy Walther [Show all 8 contributors for this article] (2016). Study of cadmium extraction from aqueous solutions with high chloride concentration using radiotracer and NMR .
• Lerum, Hans Vigeland; Bouzga, Aud Mjærum; Jørgensen, Sissel; Petersen, Dirk; Eriksen, Dag Øistein & Hansen, Eddy Walther [Show all 8 contributors for this article] (2016). LIQUID-LIQUID EXTRACTION OF CADMIUM CHLORIDE COMPLEXES STUDIED BY NMR.
• Rørvik, Per Martin; Arstad, Bjørnar; Jørgensen, Sissel; Stub, Sindre Østby; Norby, Truls & Hansen, Eddy Walther (2016). 1H-NMR and Resistance Study of Surface-Adsorbed Water in Porous YSZ.
• Paul, Jobby; Hansen, Eddy Walther; Roots, Jaan & Jørgensen, Sissel (2012). Thermal Oxidation of XLPE monitored by solid state 1H-NMR.
• Bleken, Bjørn Tore Lønstad; Arstad, Bjørnar; Jørgensen, Sissel; Wragg, David; Mouzon, Johanne & Lillerud, Karl Petter [Show all 8 contributors for this article] (2012). Unit cell thick nanosheets of H-ZSM-5: Spectroscopy and catalysis.
• Braovac, Susan; Kutzke, Hartmut; Jørgensen, Sissel; Bouzga, Aud Mjærum; Hansen, Eddy Walther & Arstad, Bjørnar (2012). ALUM-TREATED WOOD: CHARACTERIZATION USING INFRARED SPECTROSCOPY AND SOLID STATE NMR.
• Hansen, Eddy Walther; Paul, Jobby; Roots, Jaan; Jørgensen, Sissel; Poltimae, T & Krumme, Andres (2012). Easy access to the amount of short chains in ethene/alfa-alkene copolymers from solid state 1H-MAS NMR. Show summary

  Abstract Solid state 1H-MAS NMR is shown to be an attractive experimental technique for determining the comonomer content in ethene-alfa-alkene copolymers. Its advantage is associated with: a) no particular need for sample preparation, b) non-destructive, c) short overall acquisition time of the order of a few minutes. d) no need for calibration and finally e) the copolymer content in cross-linked LDPE may be determined, which is otherwise not easily accessible, as these samples are non-soluble in most liquids. References E. W. Hansen, J. Paul, S. Jørgensen, B. Arstad and A. Bouzga, IJRRAS, 2011, 6, 382–390.

• Braovac, Susan; Kutzke, Hartmut; Jørgensen, Sissel; Bouzga, Aud Mjærum; Arstad, Bjørnar & Hansen, Eddy Walther (2011). Alum-treated wood: characterization using infrared spectroscopy and solid state 1h and 13C NMR. Show summary

  Abstract The Oseberg find contains a large proportion of hardwoods that had been treated about 100 years ago with hot solutions of alum salts (potassium aluminum sulfate dodecahydrate, KAl(SO4)2 . 12H2O). Today, the wood is characterized by a high acidity (pH 1) and is structurally highly degraded. The observed deterioration is also active. The ‘alum treatment’ was a method of choice for the conservation of highly deteriorated waterlogged archaeological wood found from 1850 – 1950 and has since been replaced by treatment with polyethylene glycols (PEG). The alum treatment has been mainly used in Scandinavia but also in the USA, Japan and other European countries. Attempts to chemically characterize the alum-treated wood from the Oseberg find is one phase in the research currently being undertaken at the Museum of Cultural History as a part of the Alum Research Project. The ultimate aim of this project is to design conservation re-treatments which will stabilize and strengthen the wood. So far, we have focussed on non-destructive analytical techniques using ATR-FTIR and solid state NMR. Further chemical analyses are planned, using destructive techniques. Analyses using infrared spectroscopy and solid state 1H and 13C NMR were undertaken on selected alum-treated samples and compared with fresh woods as well as archaeological woods from the same find not treated with alum. The advantages of these analytical techniques lie in the fact that sample preparation is minimal prior to measurement – highly deteriorated wood can be greatly modified by standard sample preparation procedures. These techniques, when used together, give an acceptable level of qualitative structural information regarding the state of the remaining polymers. Analytical results demonstrated that all alum-treated samples are highly degraded relative to archaeological wood from the same find not treated with alum salts. The non-alum-treated archaeological wood has carbohydrates left, which are highly reduced in the alum-treated wood. 13C NMR can distinguish different lignin types, and has shown that syringyl lignin is more deteriorated than guaiacyl lignin in the most deteriorated alum-treated samples. NMR and FTIR-ATR results also show that remaining polymers in the alum-treated wood, dominated by lignins, are highly oxidized and contain carboxylic groups. This shows that the alum-treatment has caused extensive chemical changes in the wood, resulting in wood with a powdery consistency with almost no structural integrity relative to samples from Oseberg not treated with alum.

• Truong, Le Thuy; Larsen, Åge Gellein; Holme, Børge; Diplas, Spyros; Hansen, Finn Knut & Roots, Jaan (2009). Dispersibility of Silane-functionalized Alumina Nanoparticles in Syndiotactic Polypropylene.
• Tønnessen, Trine; Jørgensen, Sissel; Diplas, Spyros & Middleton, Hugh (2007). Electrodes for Alkaline Fuel Cells and Electrolysers Prepared by Thermal Spraying.
• Tønnessen, Trine; Jørgensen, Sissel; Diplas, Spyros & Middleton, Hugh (2007). Thermal Sprayed Electrodes for Hydrogen Evolution in Alkaline Electrolysers.
• Kjølseth, Christian; Fjeld, Harald; Jørgensen, Sissel & Norby, Truls (2007). ESEM and HT-stage investigation of grain boundaries in solid state ionics.
• Diplas, Spyridon; Ulyashin, Alexander; Maknys, Kestutis; Gunnæs, Anette Eleonora; Jørgensen, Sissel & Watts, J.F. [Show all 8 contributors for this article] (2006). On the processing-structure properties of ITO layers deposited on crystalline and amorphous Si.
• Diplas, Spyridon; Tønnessen, Trine; Knutsen, Turid; Horst, Jens Anton & Jørgensen, Sissel (2005). Probing the electronic structure of Ni-B, Ni-S and Ni-P catalysts with Scanning Tunneling Spectroscopy and XPS.
• Finstad, Terje; Heng, Chenglin; Li, Yanjun; Mayandi, Jeyanthinath; Olsen, Arne & Jørgensen, Sissel (2005). Strong luminescence from Er in an environment of Ge nanoclusters in SiO2.
• Heng, Chenglin; Finstad, Terje; Li, Yanjun; Mayandi, Jeyanthinath; Jørgensen, Sissel & Storås, Preben [Show all 8 contributors for this article] (2005). The precipitation of Ge-rich nano particles in an (Er,Ge) co doped SiO2 matrix.
• Knutsen, Turid; Våland, Torstein; Håkansson, B & Jørgensen, Sissel (2003). A Surface Study of Amorphous and Crystalline Ni78Si8B14. Show summary

  Some amorphous metals are reported to be more active electrocatalysts for hydrogen and oxygen evoution than the same crystalline metals. The catalytic activity of hydrogen evolution in alkaline solution has been shown to correlate with the crystalline size in electrodeposited NiPx and NiBx alloys. The aim of this work is to study the electronic properties of amorphous/nanocrystalline surfaces in Ni78Si8B14 before and after crystallization. Scanning Tunneling Spectroscopy is one of the most powerful spectroscopic techniques for studying a variety of surface electronic properties at atomic scale resolution.

• Knutsen, Turid; Hansen, Vidar; Håkansson, B; Gunnæs, Anette; Jørgensen, Sissel & Våland, Torstein [Show all 7 contributors for this article] (2003). A Study of Amorphous and Crystalline Ni78Si8B14.
• Knutsen, Turid; Hansen, Vidar; Håkansson, B.; Gunnæs, Anette Eleonora; Jørgensen, Sissel & Våland, T. [Show all 7 contributors for this article] (2003). A study of amorphous and crystalline Ni78Si8B14.
• Ashok, Anuradha Machina; Olsen, Arne; Norby, Truls Eivind; Hansel, Michael & Jørgensen, Sissel (2003). Structural study of A3(Ca1+xNb2-x)O(9-3x)/2 with A=Ba, Sr.
• Gunnæs, Anette Eleonora; Marstein, Erik Stensrud; Turan, Rasit; Jørgensen, Sissel; Serincan, U. & Olsen, Arne [Show all 7 contributors for this article] (2002). A New type of Cavity formation Process Found in Heat Treated Ge Implanted SiO2 Films.
• Tyholdt, Frode; Horst, Jens Anton; Jørgensen, Sissel; Østvold, Thomas & Nordby, Truls (1999). Segregation of Sr in Sr-doped LaPO4 ceramics.

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