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  • 1.
    Ali, Sharafat
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för byggd miljö och energiteknik (BET).
    Paul, Biplab
    Linköping University.
    Magnusson, Roger
    Linköping University.
    Greczynski, Grzegorz
    Linköping University.
    Broitman, Esteban
    Linköping University.
    Jonson, Bo
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för byggd miljö och energiteknik (BET).
    Eklund, Per
    Linköping University.
    Birch, Jens
    Linköping University.
    Novel transparent Mg-Si-O-N thin films with high hardness and refractive index2016Inngår i: Vacuum, ISSN 0042-207X, E-ISSN 1879-2715, Vol. 131, s. 1-4Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    There is an increasing demand for glass materials with better mechanical and optical properties for display and electronic applications. This paper describes the deposition of novel thin films of Mg-Si-O-N onto float glass substrates. Amorphous thin films in the Mg-Si-O-N system with high nitrogen and magnesium contents were deposited by reactive RF magnetron co-sputtering from Mg and Si targets in Ar/N2/O2 gas mixtures. The thin films studied span an unprecedented range of compositions up to 45 at% Mg and 80 at% N out of cations and anions respectively. Thin films in the Mg-Si-O-N system were found to be homogeneous and transparent in the visible region. Mechanical properties like hardness (H) and reduced elastic modulus (Er) show high values, up to 21 GPa and 166 GPa respectively. The refractive index (1.87-2.00) increases with increasing magnesium and nitrogen contents.

  • 2.
    Bergsell, Philip
    Linnéuniversitetet, Fakulteten för Hälso- och livsvetenskap (FHL), Institutionen för kemi och biomedicin (KOB).
    Karakterisering av mikroalger och återvinning av biprodukter2018Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
  • 3.
    Brandin, Jan
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för byggd miljö och energiteknik (BET).
    Odenbrand, Ingemar
    Lund University .
    Poisoning of SCR Catalysts used in Municipal Waste Incineration Applications2017Inngår i: Topics in catalysis, ISSN 1022-5528, E-ISSN 1572-9028, Vol. 60, nr 17-18, s. 1306-1316Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A commercial vanadia, tungsta on titania SCRcatalyst was poisoned in a side stream in a waste incinerationplant. The effect of especially alkali metal poisoningwas observed resulting in a decreased activity at long timesof exposure. The deactivation after 2311 h was 36% whilethe decrease in surface area was only 7.6%. Thus the majorcause for deactivation was a chemical blocking of acidicsites by alkali metals. The activation–deactivation modelshowed excellent agreement with experimental data. Themodel suggests that the original adsorption sites, fromthe preparation of the catalyst, are rapidly deactivated butare replaced by a new population of adsorption sites dueto activation of the catalyst surface by sulphur compounds(SO2, SO3)in the flue gas.

  • 4.
    Bring, Torun
    et al.
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Institutionen för teknik och design. kemi.
    Jonson, Bo
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Institutionen för teknik och design. Kemi.
    Kloo, Lars
    Oorganisk Kemi, KTH.
    Potassium sulfate droplets and the origin of turbidity in alabaster glass2006Inngår i: Glass Technology : European Journal of Glass Science and Technology A, Vol. 47, nr 1, s. 15-18Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A study of the criteria required to manufacture multi-component semi-transparent silicate glasses, so called “alabaster” glass, has found that the optical effect is caused by non-crystal¬line potassium sulfate droplets. The droplets were characterized by use of XRD, SEM/EDX and Raman spectroscopy. The size range of the particles is in the order of 5-50 micrometers. It was found that the droplets consisted of potassium sulfate, even if other sulfate compounds were added to the glass. The amount of sulfate compound added, the melting temperature of the furnace and the melting time have significant effect on the optical density of the glass. The optical density of the glass can be correlated to the calculated surface tension of the host glass, suggesting that phase separation of a sulfate enriched liquid phase is part of the mecha¬nism forming the droplets. By adding pigments several different colours can be obtained, but the alabaster effect is not achieved during reducing conditions, thus it seems not possible to produce colours originating from reduced pigments. Pigments tested were Cr, Fe, Co, Cu, Au, Mo/Se, Nd and Ti/Ce/Se.

  • 5.
    Paz-Garcia, Juan Manuel
    et al.
    Technical University of Denmark, Denmark.
    Johannesson, Björn
    Technical University of Denmark, Denmark.
    Ottosen, Lisbeth M.
    Technical University of Denmark, Denmark.
    Ribeiro, A. B.
    New University of Lisbon, Portugal.
    Rodriguez-Maroto, J. M.
    University of Málaga, Spain.
    Two-Dimensional Modeling of the Electrokinetic Desalination Treatment of a Brick Wall: Abstract of oral presentation2011Inngår i: 2011 EREM: Developments in Elektrokinetic Remediation of Soils, Sediments and Construction Materials, 2011, s. 94-95Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Chlorides, nitrates and sulfates are considered the main responsible of the salt-induced decay in facades and sculptures. Electrokinetic desalination treatments have been showing high efficiency for the recuperation of different construction materials suffering from salt weathering [1]. Buffer substance enhancement methods are typically used in order to avoid damage in the material due to the pH changes, as well as to improve the removal efficiency. In some practical cases, the electrokinetic desalination treatment of a wall requires the electrodes to be placed in the same surface [2]. On these cases, the clean up process proceeds in an inhomogeneous way with respect to the depth of the wall. The region of the wall close the external surface where the electrodes are placed is cleaned faster. Due to changes onthe conductivity of the pore solution as a result of the removal process, the desalination proceeds deeper in the domain. At the same time, the gradient in the concentration of the species promotes the transport in the direction of the external surface.

    In the present work, a two-dimensional model of electrokinetic desalination process of a brick wall is discussed. In the modeled system, the reactive flow of ionic and non-ionic species is described taking into account the transport phenomena and the chemical and electrochemical interactions affecting the different species in the system as well as the solid matrix. The transport process is modeled by finite elements integration of the strongly coupled Nernst-Planck-Poisson system of equations. A mass balance equation, for each chemical species included in the system, is considered. The flux term of the continuity equation takes into account the contribution of the different transport terms: the diffusion, the electromigration and the electroosmosis. The electrical potential is calculated from the global charge balance by the use of the Poisson’s equation of electrostatics, which completes the equation system [3].

    Depending on the concentration and nature of the species in the vicinities of the electrodes, the competition of different electrochemical reactions is considered. In addition to this, a set of feasible chemical equilibrium reactions is defined, and the chemical equilibrium state is assured in any position of the domain during the complete transport process. A line search Newton-Raphson method that iterates on the extents of the reaction is used for this chemical equilibrium model.

    Results from simulations of test examples are presented. The brick wall is considered initially contaminated with different combination of salts in the pore solution, and the electrodes placed in the same surface of the wall. Profiles of the target species are obtained, as well as theoretical conductivity and the ionic current in the domain during the desalination process.

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