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  • 1.
    Andersson Ersman, Peter
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Boda, Ulrika
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Petsagkourakis, Ioannis
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Åhlin, Jessica
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Posset, Uwe
    Fraunhofer, Germany.
    Schott, Marco
    Fraunhofer, Germany.
    Brooke, Robert
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Reflective and Complementary Transmissive All-Printed Electrochromic Displays Based on Prussian Blue2023In: Advanced Engineering Materials, ISSN 1438-1656, E-ISSN 1527-2648, Vol. 25, no 6, article id 2201299Article in journal (Refereed)
    Abstract [en]

    By combining the electrochromic (EC) properties of Prussian blue (PB) and poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS), complementary EC displays manufactured by slot-die coating and screen printing on flexible plastic substrates are reported. Various display designs have been realized, resulting in displays operating in either transmissive or reflective mode. For the transmission mode displays, the color contrast is enhanced by the complementary switching of the two EC electrodes PB and PEDOT:PSS. Both electrodes are either exhibiting a concurrent colorless or blue appearance. For the displays operating in reflection mode, a white opaque electrolyte is used in conjunction with the EC properties of PB, resulting in a display device switching between a fully white state and a blue-colored state. The developments of the different device architectures, that either operate in reflection or transmission mode, demonstrate a scalable manufacturing approach of all-printed EC displays that may be used in a large variety of Internet of Things applications. © 2022 The Authors. 

  • 2.
    Andersson Ersman, Peter
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Eriksson, Jerry
    RISE Research Institutes of Sweden, Built Environment, Building and Real Estate. Elitfönster AB, Sweden.
    Jakonis, Darius
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Pantzare, Sandra
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Åhlin, Jessica
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Strandberg, Jan
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Sundin, Stefan
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Toss, Henrik
    RISE Research Institutes of Sweden, Digital Systems, Mobility and Systems.
    Ahrentorp, Fredrik
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Daoud, Kaies
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Jonasson, Christian
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Svensson, Henrik
    Elitfönster AB, Sweden.
    Gregard, Greger
    ChromoGenics AB, Sweden.
    Näslund, Ulf
    Vasakronan AB, Sweden.
    Johansson, Christer
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Integration of Screen Printed Piezoelectric Sensors for Force Impact Sensing in Smart Multifunctional Glass Applications2022In: Advanced Engineering Materials, ISSN 1438-1656, E-ISSN 1527-2648, Vol. 24, no 11, article id 2200399Article in journal (Refereed)
    Abstract [en]

    Screen printed piezoelectric polyvinylidene fluoride?trifluoro ethylene (PVDF?TrFE)-based sensors laminated between glass panes in the temperature range 80?110?°C are presented. No degradation of the piezoelectric signals is observed for the sensors laminated at 110?°C, despite approaching the Curie temperature of the piezoelectric material. The piezoelectric sensors, here monitoring force impact in smart glass applications, are characterized by using a calibrated impact hammer system and standardized impact situations. Stand-alone piezoelectric sensors and piezoelectric sensors integrated on poly(methyl methacrylate) are also evaluated. The piezoelectric constants obtained from the measurements of the nonintegrated piezoelectric sensors are in good agreement with the literature. The piezoelectric sensor response is measured by using either physical electrical contacts between the piezoelectric sensors and the readout electronics, or wirelessly via both noncontact capacitive coupling and Bluetooth low-energy radio link. The developed sensor concept is finally demonstrated in smart window prototypes, in which integrated piezoelectric sensors are used to detect break-in attempts. Additionally, each prototype includes an electrochromic film to control the light transmittance of the window, a screen printed electrochromic display for status indications and wireless communication with an external server, and a holistic approach of hybrid printed electronic systems targeting smart multifunctional glass applications.

  • 3.
    Andersson Ersman, Peter
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Lassnig, Roman
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Strandberg, Jan
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Dyreklev, Peter
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Flexible Active Matrix Addressed Displays Manufactured by Screen Printing2020In: Advanced Engineering Materials, ISSN 1438-1656, E-ISSN 1527-2648, Vol. 23, article id 2000771Article in journal (Refereed)
    Abstract [en]

    A flexible, electrochromic, active matrix addressed display (AMAD) is demonstrated. The monolithically integrated AMAD, which contains a 3 × 3 array of organic electrochromic smart pixels (OESPs), is manufactured on a plastic substrate solely using screen printing. Each OESP is based on the combination of one organic electrochromic display (OECD) and one organic electrochemical transistor (OECT), where both devices are screen printed into multilayered vertical architectures. The conduction state of the OECT enables control of the color state of its corresponding OECD, thereby circumventing cross-talk effects in the resulting AMAD device. The manufacturing approach also involves electrical wires, which connect each OECD with its corresponding OECT and also serve as the addressing lines of the resulting AMAD device, that are formed by screen printing of an ink based on either silver or nanocopper.

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  • 4.
    Martin, Romain Georges
    et al.
    Ecole de Technologie Supérieure, Canada.
    Johansson, Christer
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Tavares, Jason Robert
    Ecole de Technologie Supérieure, Canada.
    Dubé, Martine
    Ecole de Technologie Supérieure, Canada.
    Material Selection Methodology for an Induction Welding Magnetic Susceptor Based on Hysteresis Losses2022In: Advanced Engineering Materials, ISSN 1438-1656, E-ISSN 1527-2648, Vol. 24, no 3, article id 2100877Article in journal (Refereed)
    Abstract [en]

    Induction welding is a fusion bonding process relying on the application of an alternating magnetic field to generate heat at the joining interface. Herein, magnetic hysteresis losses heating elements, called susceptors, which are made of magnetic particles dispersed in a thermoplastic polymer, are investigated. A methodology to identify the parameters influencing the heating rate of the susceptors and to select suitable magnetic particles for their fabrication is proposed. The applied magnetic field amplitude is modeled based on the induction coil geometry and the alternating electrical current introduced to it. Then, properties of the evaluated susceptor particles are obtained through measurements of their magnetic hysteresis. A case study is presented to validate the suitability of the proposed methodology. Particles of iron (Fe), nickel (Ni), and magnetite (Fe3O4) are evaluated as susceptor materials in polypropylene (PP) and polyetheretherketone (PEEK) matrices. Heating rates are predicted using the proposed method, and samples are produced and heated by induction to experimentally verify the results. Good agreement with the predictions is obtained. Ni is the most suitable susceptor material for a PP matrix, while Fe3O4 is preferable for PEEK.

  • 5.
    Mir, Zahid Mohammad
    et al.
    Helmholtz-Zentrum Geesthacht Centre for Materials and Coastal Research, Germany.
    Bastos, Alexandre Cunha
    Universidade de Aveiro, Portugal.
    Gomes, Celestino
    Universidade de Aveiro, Portugal.
    Mueller, Urs
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Alonso, Maria Cruz
    CSIC Institute of Construction Science Eduardo Torroja, Spain.
    Villar, Kristina
    CSIC Institute of Construction Science Eduardo Torroja, Spain.
    Rabade, Miguel Prieto
    Universidade de Aveiro, Portugal.
    Maia, Frederico
    SmallMaTek LDA, Portugal.
    Rocha, Cláudia M.
    SmallMaTek LDA, Portugal.
    Maincon, Philippe
    SINTEF, Norway.
    Höche, Daniel
    Helmholtz-Zentrum Geesthacht Centre for Materials and Coastal Research, Germany.
    Ferreira, Mario G. S.
    Universidade de Aveiro, Portugal.
    Zheludkevich, Mikhail L.
    Helmholtz-Zentrum Geesthacht Centre for Materials and Coastal Research, Germany; University of Kiel, Germany.
    Numerical and Experimental Analysis of Self-Protection in Reinforced Concrete due to Application of Mg–Al–NO2 Layered Double Hydroxides2020In: Advanced Engineering Materials, ISSN 1438-1656, E-ISSN 1527-2648Article in journal (Refereed)
    Abstract [en]

    Concrete possesses an intrinsic chloride binding capacity. Chloride ions from the environment bind with the hydrated cementitious phases in the form of bound chlorides. The contribution of chemically bound chlorides toward increasing the service life of concrete structures is vital as they help in slowing down the chloride diffusion in the concrete thereby delaying reinforcement depassivation. The authors attempt to increase the chloride binding capacity of concrete by adding a small amount of Mg–Al–NO2 layered double hydroxides (LDHs) with the objective to delay reinforcement corrosion and by this to considerably extend the service life of concrete structures situated in harsh environments. This study presents numerical and experimental analysis of the action of LDH in concrete. Formation factor is used to determine the effective chloride diffusion coefficient. In addition, the chloride binding isotherms together with Poisson–Nernst–Planck equations are used to model the chloride ingress. A comparable chloride binding is observed for concrete with and without Mg–Al–NO2, depicting only a slight chloride uptake by Mg–Al–NO2. Further investigations are conducted to understand this behavior by studying the stability and chloride entrapping capacity Mg–Al–NO2 in concrete. © 2020 The Authors.

  • 6.
    Strondl, Annika
    et al.
    RISE, Swerea, Swerea KIMAB.
    Milenkovic, S.
    Universidad Carlos III de Madrid.
    Schneider, A.
    V and M Deutschland GmbH.
    Klement, U.
    Chalmers University of Technology.
    Frommeyer, G.
    Max-Planck-Institut für Eisenforschung GmbH.
    Effect of processing on microstructure and physical properties of three nickel-based superalloys with different hardening mechanisms2012In: Advanced Engineering Materials, ISSN 1438-1656, E-ISSN 1527-2648, Vol. 14, no 7, p. 427-438Article in journal (Refereed)
    Abstract [en]

    The nickel-based superalloys Inconel alloy 600, Udimet alloy 720, and Inconel alloy 718 were produced by electron beam melting (EBM), casting, and directional solidification (DS). The distance between dendrites and the size of the precipitates indicated the difference in solidification rates between the three processes. In this study, the solidification rate was fastest with EBM, closely followed by casting, whereas it was much slower with DS. In the directional solidified materials the <100> direction was the fastest and thus, preferred growth direction. The EBM samples show a sharp (001)[100] texture in the building direction and in the two scanning directions of the electron beam. Macrosegregation was observed in some cast and directionally solidified samples, but not in the EBM samples. The melting temperatures are in good agreement with literature and the narrow melting interval of IN600 compare to UD720 and IN718 might reduce the risk of incipient melting during EBM processing. Porosity was observed in the EBM samples and the reasons are discussed. However, EBM seems to be a feasible process route to produce nickel-based superalloys with well-defined texture, no macrosegregation and a rapidly solidified microstructure. The nickel-based superalloys Inconel alloy 600, Udimet alloy 720, and Inconel alloy 718 are produced by electron beam melting (EBM), casting, and directional solidification. Material differences due to the different processing routes are investigated. EBM seems to be a feasible way to produce superalloys with well-defined texture, no macrosegregation and a rapidly solidified microstructure. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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