• Ice particles sink below the water surface due to a balance of salt, van der Waals and buoyancy forces 

      Thiyam, Priyadarshini; Fiedler, Johannes; Buhmann, Stefan Yoshi; Persson, Clas; Brevik, Iver Håkon; Boström, Mathias; Parsons, Drew F. (Journal article; Peer reviewed, 2018)
      According to the classical Archimedes’ principle, ice floats in water and has a fraction of its volume above the water surface. However, for very small ice particles, other competing forces such as van der Waals forces due ...
    • Inflation in terms of a viscous van der Waals coupled fluid 

      Brevik, Iver Håkon; Obukhov, V. V.; Timoshkin, A. V. (Journal article; Peer reviewed, 2018)
      We propose to describe the acceleration of the universe by introducing a model of two coupled fluids. We focus on the accelerated expansion at the early stages. The inflationary expansion is described in terms of a van der ...
    • Lifshitz interaction can promote ice growth at water-silica interfaces 

      Boström, Mathias; Malyi, Oleksandr; Parashar, Prachi; Shajesh, Kuloth Vayalombron; Thiyam, Priyadarshini; Milton, Kimball A.; Persson, Clas; Parsons, Drew F.; Brevik, Iver Håkon (Journal article; Peer reviewed, 2017)
      At air-water interfaces, the Lifshitz interaction by itself does not promote ice growth. On the contrary, we find that the Lifshitz force promotes the growth of an ice film, up to 1–8 nm thickness, near silica-water ...
    • Metal complex as a novel approach to enhance the amorphous phase and improve the EDLC performance of plasticized proton conducting chitosan-based polymer electrolyte 

      Asnawi, A. S. F. M.; Aziz, S. B.; Nofal, M. M.; Yusof, Y. M.; Brevik, Iver Håkon; Hamsan, M. H.; Brza, M. A.; Abdulwahid, R. T.; Kadir, M. F. Z. (Peer reviewed; Journal article, 2020)
      Abstract This work indicates that glycerolized chitosan-NH4F polymer electrolytes incorporated with zinc metal complexes are crucial for EDLC application. The ionic conductivity of the plasticized system was improved ...
    • Minkowski momentum resulting from a vacuum-medium mapping procedure, and a brief review of Minkowski momentum experiments 

      Brevik, Iver Håkon (Journal article; Peer reviewed, 2017)
      A discussion is given on the interpretation and physical importance of the Minkowski momentum in macroscopic electrodynamics (essential for the Abraham–Minkowski problem). We focus on the following two facets: (1) Adopting ...
    • A new version of the Hermite-Hadamard inequality for Riemann-Liouville fractional integrals 

      Mohammed, P. O.; Brevik, Iver Håkon (Peer reviewed; Journal article, 2020)
      Integral inequalities play a critical role in both theoretical and applied mathematics fields. It is clear that inequalities aim to develop different mathematical methods. Thus, the present days need to seek accurate ...
    • Non-perturbative theory of dispersion interactions 

      Boström, Mathias; Thiyam, Priyadarshini; Persson, Clas; Parsons, Drew F.; Buhmann, Stefan Yoshi; Brevik, Iver Håkon; Sernelius, Bo. E. (Journal article; Peer reviewed, 2015)
      Some open questions exist with fluctuation-induced forces between extended dipoles. Conventional intuition derives from large-separation perturbative approximations to dispersion force theory. Here, we present a full ...
    • Nonperturbative theory for the dispersion self-energy of atoms 

      Thiyam, Priyadarshini; Persson, Clas; Brevik, Iver Håkon; Sernelius, Bo. E.; Boström, Mathias (Journal article; Peer reviewed, 2014)
      We go beyond the approximate series expansions used in the dispersion theory of finite-size atoms. We demonstrate that a correct, and nonperturbative, theory dramatically alters the dispersion self-energies of atoms. The ...
    • On isotropic turbulence in the dark fluid universe 

      Brevik, Iver Håkon; Gorbunova, Olesya; Nojiri, Shin'ichi; Odintsov, Sergei D. (Journal article; Peer reviewed, 2011)
      As a first part of this work, experimental information about the decay of isotropic turbulence in ordinary hydrodynamics, is used as input in FRW equations in order to investigate how an initial fraction f of turbulent ...
    • Presence of negative entropies in Casimir interactions 

      Høye, Johan Skule; Brevik, Iver Håkon; Milton, Kimball A. (Journal article; Peer reviewed, 2016)
      Negative entropy in connection with the Casimir effect at uniform temperature is a phenomenon rooted in the circumstance that one is describing a nonclosed system, or only part of a closed system. In this paper we show ...
    • Structural, impedance and electrochemical characteristics of electrical double layer capacitor devices based on chitosan: Dextran biopolymer blend electrolytes 

      Aziz, S. B.; Hamsan, Muhamad H.; Nofal, M. M.; Karim, W. O.; Brevik, Iver Håkon; Brza, M. A.; Abdulwahid, R. T.; Al-Zangana, S.; Kadir, M. F. Z. (Peer reviewed; Journal article, 2020)
      This report presents the preparation and characterizations of solid biopolymer blend electrolyte films of chitosan as cationic polysaccharide and anionic dextran (CS: Dextran) doped with ammonium iodide (NH4I) to be utilized ...
    • The study of structural, impedance and energy storage behavior of plasticized PVA:MC based proton conducting polymer blend electrolytes 

      Aziz, S. B.; Brevik, Iver Håkon; Brza, M. A.; Asnawi, A. S. F. M.; Dannoun, E. M. A.; Yusof, Y. M.; Abdulwahid, R. T.; Hamsan, M. H.; Nofal, M. M.; Kadir, M. F. Z. (Peer reviewed; Journal article, 2020)
      In this study, structural characterization, electrical properties and energy storage performance of plasticized polymer electrolytes based on polyvinyl alcohol/methylcellulose/ammonium thiocyanate (PVA/MC-NH4SCN) were ...
    • The influence of Lifshitz forces and gas on premelting of ice within porous materials 

      Boström, Mathias; Malyi, Oleksandr; Thiyam, Priyadarshini; Berland, Kristian; Brevik, Iver Håkon; Persson, Clas; Parsons, Drew F. (Journal article; Peer reviewed, 2016)
      Premelting of ice within pores in earth materials is shown to depend on the presence of vapor layers. For thick vapor layers between ice and pore surfaces, a nanosized water sheet can be formed due to repulsive Lifshitz ...
    • The reality of Casimir friction 

      Milton, Kimball A.; Høye, Johan Skule; Brevik, Iver Håkon (Journal article; Peer reviewed, 2016)
      For more than 35 years theorists have studied quantum or Casimir friction, which occurs when two smooth bodies move transversely to each other, experiencing a frictional dissipative force due to quantum electromagnetic ...
    • Thermal corrections to the Casimir effect 

      Brevik, Iver Håkon; Ellingsen, Simen Andreas; Milton, Kimball A. (Journal article; Peer reviewed, 2006)
      The Casimir effect, reflecting quantum vacuum fluctuations in the electromagnetic field in a region with material boundaries, has been studied both theoretically and experimentally since 1948. The forces between ...
    • Viscosity in modified gravity 

      Brevik, Iver Håkon (Journal article; Peer reviewed, 2012)
      A bulk viscosity is introduced in the formalism of modified gravity. It is shown that, based on a natural scaling law for the viscosity, a simple solution can be found for quantities such as the Hubble parameter and the ...
    • Viscosity-Induced Crossing of the Phantom Barrier 

      Brevik, Iver Håkon (Journal article; Peer reviewed, 2015)
      We show explicitly, by using astrophysical data plus reasonable assumptions for the bulk viscosity in the cosmic fluid, how the magnitude of this viscosity may be high enough to drive the fluid from its position in the ...
    • Viscosity-induced crossing of the phantom divide in the dark cosmic fluid 

      Brevik, Iver Håkon (Journal article; Peer reviewed, 2013-12-10)
      Choosing various natural forms for the equation-of-state parameter w and the bulk viscosity ζ, we discuss how it is possible for a dark energy fluid to slide from the quintessence region across the divide w = −1 into the ...
    • Viscous cosmology - Bulk viscosity in the cosmological context 

      Normann, Ben David (Master thesis, 2015)
      The main objective of this thesis has been to estimate the present value of the bulk viscosity of the cosmic fluid. The following list contains a summary of the main results found in the present work: -The bulk viscosity ...
    • Viscous Cosmology for Early- and Late-Time Universe 

      Brevik, Iver Håkon; Grøn, Øyvind; de Haro, Jaume; Odintsov, Sergei D.; Saridakis, Emmanuel N. (Journal article; Peer reviewed, 2017)
      From a hydrodynamicist’s point of view the inclusion of viscosity concepts in the macroscopic theory of the cosmic fluid would appear most natural, as an ideal fluid is after all an abstraction (exluding special cases such ...