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2019
1 Helgesen, Geir.
Evolving Soft Matter: Shape, Dynamics and Functionality. The Geilo School 2019, March 11-21, Geilo, Norway. Kjeller: Institutt for energiteknikk 2019 (ISBN 978-82-7017-924-4) 28 s. IFE/E(2019/015)
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2 Helgesen, Geir.
Propulsion of microspheres in fluids using rotating magnetic fields. The European Physical Journal Special Topics 2019 ;Volum 227.(17) s. 2425-2438
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3 Pal, Santosh Kumar; Frommen, Christoph; Kumar, Susmit; Hauback, Bjørn; Fjellvåg, Helmer; Woodcock, T. G.; Nielsch, K; Helgesen, Geir.
Comparative phase transformation and magnetocaloric effect study of Co and Mn substitution by Cu in MnCoGe compounds. Journal of Alloys and Compounds 2019 ;Volum 775. s. 22-29
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4 Skjeltorp, Arne Torbjørn; Helgesen, Geir.
Physics inspired by living matter: dynamics, topology and functionality. The European Physical Journal Special Topics 2019 ;Volum 227.(17) s. 2391-2392
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2018
5 Helgesen, Geir.
Magnetic propulsion of microspheres at liquid-glass interfaces. Journal of Applied Physics 2018 ;Volum 123.(6)
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6 Larsen, Simon R.; Hansteen, Marie; Pacáková, Barbara; Theodor, Keld; Arnold, Thomas; Rennie, Adrian R.; Helgesen, Geir; Knudsen, Kenneth Dahl; Bordallo, Heloisa N.; Fossum, Jon Otto; Cavalcanti, Leide Passos.
Sample cell for studying liquid interfaces with an in situ electric field using X-ray reflectivity and application to clay particles at oil-oil interfaces. Journal of Synchrotron Radiation 2018 ;Volum 25. s. 915-917
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2017
7 Cavalcanti, Leide Passos; Kalantzopoulos, Georgios N.; Sobas, Pawel Andrzej; Bordallo, Heloisa N.; Helgesen, Geir; Knudsen, Kenneth; Fossum, Jon Otto.
High charge density smectite clays for CO2 capture, Leide P. Cavalcanti, Georgios Kalantzopoulos, Pawel Sobas, Heloisa N. Bordallo, Geir Helgesen, Kenneth D Knudsen and Jon Otto Fossum, talk presented at 16th International Clay Conference (16ICC): Clays from the Oceans to Space, in Session ES02: Environmental Applications of Clay Minerals, Granada Spain July 17th 2017. 16th International Clay Conference (16ICC); 2017-07-17 - 2017-07-17
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8 Cavalcanti, Leide Passos; Kalantzopoulos, Georgios N.; Sobas, Pawel Andrzej; Bordallo, Heloisa N.; Helgesen, Geir; Knudsen, Kenneth; Fossum, Jon Otto.
Why are high charge density clays effective for CO2 capture?, L. P. Cavalcanti, G. Kalantzopoulos, P. Sobas, H. N. Bordallo, G. Helgesen, K. D. Knudsen, J. O. Fossum, Norsk Fysisk Selskap - Fysikermøtet 2017, Tromsø Aug 7-9 2017. Norsk Fysisk Selskap - Fysikermøtet 2017; 2017-08-07 - 2017-08-09
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2016
9 Skjeltorp, Arne Torbjørn; Helgesen, Geir.
Editorial. The European Physical Journal Special Topics 2016 ;Volum 225.(4) s. 627-628
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2015
10 Cernák, Jozef; Helgesen, Geir; Cizmar, Erik; Kovác, Jozef; Jurašeková, Zuzana; Voltr, Josef.
Magnetic properties of graphene nanodisk and nanocone powders at low temperatures. Physical review B (PRB) 2015 ;Volum 92.
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11 Knaapila, Matti; Høyer, Henrik; Helgesen, Geir.
Composite microdiscs with a magnetic belt: Preparation, chaining properties, and use as switchable catalyst carriers. ACS Applied Materials & Interfaces 2015 ;Volum 7.(14) s. 7795-7800
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12 Michels, Leander; Fossum, Jon Otto; Rozynek, Zbigniew Jerzy; Hemmen, Henrik; Rustenberg, Karin Hveding; Sobas, Pawel Andrzej; Kalantzopoulos, Georgios N.; Helgesen, Geir; Knudsen, Kenneth Dahl; Janek, Márian; Plivelic, Tomás S.; da silva, Geraldo Jose.
Intercalation and Retention of Carbon Dioxide in a Smectite Clay promoted by Interlayer Cations. Nordic Physics Days, NTNU, Trondheim Norway, June 9-12, 2015; 2015-06-09 - 2015-06-12
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13 Sandsaunet, Marit Ulset; Knaapila, Matti; Tavares, Luciana; Kjelstrup-Hansen, Jacob; Helgesen, Geir.
Parallel integration of aligned carbon strings in polymer composite: Dielectrophoretic preparation, finite element simulation, and electrical characterization. Polymer Composites 2015 ;Volum 36.(10) s. 1866-1874
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2014
14 Cernák, Jozef; Helgesen, Geir; Hage, Fredrik Sydow; Kovác, Jozef.
Magnetoresistance of composites based on graphitic discs and cones. Journal of Physics D: Applied Physics 2014 ;Volum 47.(33)
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15 Hage, Fredrik Sydow; Kepaptsoglou, Despoina Maria; Seabourne, Ché Royce; Ramasse, Quintim M.; Scott, Andrew J.; Prytz, Øystein; Gunnæs, Anette Eleonora; Helgesen, Geir.
Dielectric response of pentagonal defects in multilayer graphene nano-cones. Nanoscale 2014 ;Volum 6.(3) s. 1833-1839
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16 Knaapila, Matti; Høyer, Henrik; Helgesen, Geir.
Dielectrophoresis in particle confinement: Aligned carbon particles in polymer matrix below percolation threshold. The European Physical Journal Special Topics 2014 ;Volum 223.(9) s. 1869-1882
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17 Knaapila, Matti; Høyer, Henrik; Kjelstrup-Hansen, Jacob; Helgesen, Geir.
Transparency enhancement for photoinitiated polymerization (UV curing) through magnetic field alignment in a piezoresistive metal/polymer composite. ACS Applied Materials & Interfaces 2014 ;Volum 6.(5) s. 3469-3476
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18 Skjeltorp, Arne Torbjørn; Helgesen, Geir.
Editorial. The European Physical Journal Special Topics 2014 ;Volum 223.(9) s. 1743-1744
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2013
19 Cernák, Jozef; Helgesen, Geir; Skjeltorp, Arne Torbjørn; Kovác, Jozef; Voltr, Josef; Cizmar, Erik.
Magnetic properties of carbon nanodisk and nanocone powders. Physical Review B. Condensed Matter and Materials Physics 2013 ;Volum 87.(1) s. -
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20 Hage, Fredrik Sydow; Ramasse, Quentin; Kepaptsoglou, Despoina Maria; Prytz, Øystein; Gunnæs, Anette Eleonora; Helgesen, Geir; Brydson, Rik.
Topologically induced confinement of collective modes in multilayer graphene nanocones measured by momentum-resolved STEM-VEELS. Physical Review B. Condensed Matter and Materials Physics 2013 ;Volum 88.(15) s. -
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21 Mauroy, Henrik; Hansen, Elisabeth Lindbo; Rozynek, Zbigniew; Plivelic, Tomás S.; Fossum, Jon Otto; Helgesen, Geir; Knudsen, Kenneth.
Polystyrene‐clay nanocomposites: the effect of clay surface charge. 15th International Clay Conference; 2013-07-07 - 2013-07-11
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22 Mauroy, Henrik; Plivelic, Tomás S.; Hansen, Elisabeth Lindbo; Fossum, Jon Otto; Helgesen, Geir; Knudsen, Kenneth.
Effect of clay surface charge on the emerging properties of polystyrene-organoclay nanocomposites. Journal of Physical Chemistry C 2013 ;Volum 117.(38) s. 19656-19663
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23 Mauroy, Henrik; Rozynek, Zbigniew; Plivelic, Tomás S.; Fossum, Jon Otto; Helgesen, Geir; Knudsen, Kenneth.
Oxygen-Controlled Phase Segregation in Poly(N-isopropylacrylamide)/Laponite Nanocomposite Hydrogels. Langmuir 2013 ;Volum 29.(1) s. 371-379
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24 Mauroy, Henrik; Rozynek, Zbigniew; Plivelic, Tomás S.; Fossum, Jon Otto; Helgesen, Geir; Knudsen, Kenneth.
Phase segregation in PNIPAAM‐laponite hydrogels: the effect of dissolved oxygen. 15th International Clay Conference; 2013-07-07 - 2013-07-11
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25 Sobas, Pawel Andrzej; Knudsen, Kenneth; Helgesen, Geir; Skjeltorp, Arne Torbjørn; Mauroy, Henrik; Fossum, Jon Otto.
Supercritical CO2 in aerogels and clay materials studied by small angle neutron scattering. Soft Matter Confinement, Geilo School; 2013-03-11 - 2013-03-21
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26 Sobas, Pawel Andrzej; Knudsen, Kenneth; Helgesen, Geir; Skjeltorp, Arne Torbjørn; Mauroy, Henrik; Fossum, Jon Otto.
Supercritical CO2 in aerogels and clay materials studied by small angle neutron scattering. 15th International Clay Conference; 2013-07-07 - 2013-07-11
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27 Sobas, Pawel Andrzej; Knudsen, Kenneth; Helgesen, Geir; Skjeltorp, Arne Torbjørn; Mauroy, Henrik; Kalantzopoulos, Georgios N.; Fossum, Jon Otto.
CO2 adsorption and intercalation in aerogels and clay materials studied by SANS. Nordsoft International workshop on Soft matter Physics and Biomembranes; 2013-05-21 - 2013-05-24
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28 Sobas, Pawel Andrzej; Knudsen, Kenneth; Helgesen, Geir; Skjeltorp, Arne Torbjørn; Måløy, Knut Jørgen; Rozynek, Zbigniew; Fossum, Jon Otto.
Dynamic light scattering measurements of clay materials in liquid CO2: preliminary results. 15th International Clay Conference; 2013-07-07 - 2013-07-11
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29 Sobas, Pawel Andrzej; Knudsen, Kenneth; Helgesen, Geir; Skjeltorp, Arne Torbjørn; Måløy, Knut Jørgen; Rozynek, Zbigniew; Fossum, Jon Otto.
Dynamic Light Scattering measurements of clay materials in lquid CO2: Preliminary results. Soft Matter Confinement, Geilo School; 2013-03-11 - 2013-03-21
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2012
30 Helgesen, Geir; Knaapila, Matti; Skjeltorp, Arne Torbjørn; Høyer, Henrik; Cernak, J.
Field induced microparticle structure formation in fluids. Revista Cubana de Física 2012 ;Volum 29.(1E34) s. -
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31 Høyer, Henrik; Knaapila, Matti; Kjelstrup-Hansen, Jacob; Helgesen, Geir.
Microelectromechanical strain and pressure sensors based on electric field aligned carbon cone and carbon black particles in a silicone elastomer matrix. Journal of Applied Physics 2012 ;Volum 112.(9) s. -
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32 Høyer, Henrik; Knaapila, Matti; Kjelstrup-Hansen, Jacob; Liu, Xuhai; Helgesen, Geir.
Individual strings of conducting carbon cones and discs in a polymer matrix: Electric field-induced alignment and their use as a strain sensor. Journal of Polymer Science Part B: Polymer Physics 2012 ;Volum 50.(7) s. 477-483
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33 Johnsen, Gorm Krogh; Knaapila, Matti; Martinsen, Ørjan Grøttem; Helgesen, Geir.
Conductivity enhancement of silver filled polymer composites through electric field alignment. Composites Science And Technology 2012 ;Volum 72.(15) s. 1841-1847
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34 Lukin, A.A.; Il'yashenko, E. I.; Skjeltorp, Arne Torbjørn; Helgesen, Geir.
Improvement of thermal stability of Nd-Tb-Fe-Co-B sintered magnets by additions of Pr, Ho, Al, and Cu. Physics Research International 2012 s. -
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35 Mauroy, Henrik; Knudsen, Kenneth Dahl; Helgesen, Geir; Fossum, Jon Otto; Rozynek, Zbigniew.
Synthesis and Characterization of Polysterene-Clay nanocomposites, 2nd International Workshop on Complex Physical Phenomena in Materials, Porto de Galinhas – PE, Brazil, Jan. 31 – Feb. 3, 2012. 2nd International Workshop on Complex Physical Phenomena in Materials; 2012-01-31 - 2012-02-03
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36 Skjeltorp, Arne Torbjørn; Helgesen, Geir.
Cooperative phenomena in flows: multidisciplinary perspectives. The European Physical Journal Special Topics 2012 ;Volum 204.(1) s. 1-3
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37 Sobas, Pawel Andrzej; Knudsen, Kenneth Dahl; Helgesen, Geir; Skjeltorp, Arne T.; Fossum, Jon Otto.
CO2 and porous media – SANS. I: Proceedings of the 2nd International Workshop on Complex Physical Phenomena in Materials : Hotel Armação, Porto de Galinhas - PE, Brazil, January 31-February 3, 2012. Kjeller: Complexphysics.org 2012 ISBN 978-82-93224-06-8. s. 49-50
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38 Sobas, Pawel Andrzej; Knudsen, Kenneth Dahl; Helgesen, Geir; Skjeltorp, Arne T.; Fossum, Jon Otto.
CO2 and porous media - SANS, 2nd International Workshop on Complex Physical Phenomena in Materials, Porto de Galinhas – PE, Brazil, Jan. 31 – Feb. 3, 2012. 2nd International Workshop on Complex Physical Phenomena in Materials; 2012-01-31 - 2012-02-03
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39 Sobas, Pawel Andrzej; Knudsen, Kenneth Dahl; Helgesen, Geir; Skjeltorp, Arne T.; Måløy, Knut Jørgen; Fossum, Jon Otto.
Electric field alignement of clay particles, International Workshop on Soft Matter Physics & Complex Flows, Lofoten, Norway, May 22-25, 2012. International Workshop on Soft Matter Physics & Complex Flows; 2012-05-22 - 2012-05-25
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40 Sobas, Pawel Andrzej; Knudsen, Kenneth; Helgesen, Geir; Skjeltorp, Arne Torbjørn; Måløy, Knut Jørgen; Fossum, Jon Otto.
Dynamic Light Scattering measurements of clay materials in liquid CO2: Preliminary results. CLIMIT seminar; 2012-11-29 - 2012-11-30
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2011
41 Høyer, Henrik; Knaapila, Matti; Kjelstrup-Hansen, Jacob; Liu, Xuhai; Helgesen, Geir.
A strain sensor based on an aligned carbon particle string in a UV-cured polymer matrix. Applied Physics Letters 2011 ;Volum 99.(21) s. -
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42 Knaapila, M.; Høyer, Henrik; Svåsand, Eldrid; Buchanan, Mark; Skjeltorp, Arne Torbjørn; Helgesen, Geir.
Aligned Carbon Cones in Free-Standing UV-Curable Polymer Composite. Journal of Polymer Science Part B: Polymer Physics 2011 ;Volum 49.(6) s. 399-403
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43 Knaapila, Matti; Pinheiro, Jean Patrick; Buchanan, Mark; Skjeltorp, Arne Torbjørn; Helgesen, Geir.
Directed assembly of carbon nanocones into wires with an epoxy coating in thin films by a combination of electric field alignment and subsequent pyrolysis. Carbon 2011 ;Volum 49.(10) s. 3171-3178
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44 Knaapila, Matti; Svåsand, Eldrid; Pinheiro, Jean Patrick; Martinsen, Ørjan Grøttem; Buchanan, Mark; Skjeltorp, Arne Torbjørn; Helgesen, Geir; Rømoen, Ola Taarud.
Conductivity Enhancement in Carbon Nanocone Adhesive by Electric Field Induced Formation of Aligned Assemblies. ACS Applied Materials & Interfaces 2011 ;Volum 3.(2) s. 378-384
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2010
45 Hage, Fredrik Sydow; Helgesen, Geir; Gunnæs, Anette Eleonora; Prytz, Øystein.
Graphitization of carbon nanocones and nanodiscs. Scandem 2010; 2010-06-08 - 2010-06-10
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46 Holt, Arve; Thøgersen, Annett; Rohr, Carsten; Bye, Jan-Inge; Helgesen, Geir; Nordseth, Ørnulf; Jensen, Sten Aksel; Norheim, Lasse; Nielsen, Øyvind.
Surface structure of mono-crystalline silicon wafers produced by diamond wire sawing and by standard slurry sawing before and after etching in alkaline solutions. I: 35th IEEE Photovoltaic Specialists Conference Honolulu, HI June 20-25, 2010. IEEE Press 2010 ISBN 978-1-4244-5891-2. s. 3501-3504
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2009
47 Helgesen, Geir; Knudsen, K.D.; Skjeltorp, Arne Torbjørn; Cuesta, H.F.; Elgsæter, A.; Garberg, T.; Næss, S.N.; Knaapila, M..
The Structure of Carbon Cones and Disks. The NANOMAT Conference 2009; 2009-06-16 - 2009-06-17
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48 Helgesen, Geir; Knudsen, K.D.; Skjeltorp, Arne Torbjørn; Knaapila, M.; Pinheiro, J.P.; Bourgeaux, M.; Heiberg-Andersen, H.; Gunnæs, Anette Eleonora; Prytz, Øystein.
The structure and properties of carbon cones. Materials Research Society Fall Meeting 2009; 2009-11-30 - 2009-12-04
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49 Paula, F.L.O.; Da Silva, G.J.; Aquino, R.; Depeyrot, J.; Fossum, Jon Otto; Knudsen, Kenneth D; Helgesen, Geir; Tourinho, F.A..
Gravitational and magnetic separation in self-assembled clay-ferrofluid nanocomposites. Brazilian journal of physics 2009 ;Volum 39. s. 163-170
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50 Gunnæs, Anette Eleonora; Prytz, Øystein; Olsen, Arne; Helgesen, Geir; Knudsen, K. D..
Structural study of C-cones and discs by use of analytical TEM. Scandem 2009; 2009-06-08 - 2009-06-10
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