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  • 1.
    Baresel, Christian
    et al.
    IVL Swedish Environmental Research Institute AB, Sweden.
    Schaller, Vincent
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Jonasson, Christian
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Johansson, Christer
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Bordes, Romain
    Chalmers University of Technology, Sweden.
    Chauhan, Vinay
    Chalmers University of Technology, Sweden.
    Sugunan, Abhilash
    RISE - Research Institutes of Sweden (2017-2019), Biovetenskap och material, Kemi och material.
    Sommertune, Jens
    RISE - Research Institutes of Sweden (2017-2019), Biovetenskap och material, Kemi och material.
    Welling, Sebastian
    IVL Swedish Environmental Research Institute AB, Sweden.
    Functionalized magnetic particles for water treatment2019Inngår i: Heliyon, E-ISSN 2405-8440, Vol. 5, nr 8, artikkel-id e02325Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this study, we have taken the concept of water treatment by functionalized magnetic particles one step forward by integrating the technology into a complete proof of concept, which included the preparation of surface modified beads, their use as highly selective absorbents for heavy metals ions (Zinc, Nickel), and their performance in terms of magnetic separation. The separation characteristics were studied both through experiments and by simulations. The data gathered from these experimental works enabled the elaboration of various scenarios for Life Cycle Analysis (LCA). The LCA showed that the environmental impact of the system is highly dependent on the recovery rate of the magnetic particles. The absolute impact on climate change varied significantly among the scenarios studied and the recovery rates. The results support the hypothesis that chelation specificity, magnetic separation and bead recovery should be optimized to specific targets and applications. 

  • 2.
    Bender, P.
    et al.
    University of Cantabria, Spain .
    Bogart, L. K.
    University College London, UK .
    Posth, O.
    Physikalisch-Technische Bundesanstalt, Germany .
    Szczerba, W.
    BAM Bundesanstalt für Materialforschung Und-prüfung, Germany ; AGH University of Science and Technology, Poland .
    Rogers, S. E.
    ISIS-STFC Neutron Scattering Facility, UK.
    Castro, A.
    SOLVE Research and Consultancy AB, Sweden .
    Nilsson, L.
    SOLVE Research and Consultancy AB, Sweden; Lund University, Sweden.
    Zeng, L. J.
    Chalmers University of Technology, Sweden.
    Sugunan, Abhilash
    RISE - Research Institutes of Sweden, Biovetenskap och material, Kemi och material.
    Sommertune, Jens
    RISE - Research Institutes of Sweden, Biovetenskap och material, Kemi och material.
    Fornara, A.
    RISE - Research Institutes of Sweden, Biovetenskap och material, Kemi och material.
    González-Alonso, D.
    University of Cantabria, Spain .
    Fernández Barquín, L.
    University of Cantabria, Spain.
    Johansson, Christer
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Structural and magnetic properties of multi-core nanoparticles analysed using a generalised numerical inversion method2017Inngår i: Scientific Reports, E-ISSN 2045-2322, Vol. 7, artikkel-id 45990Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The structural and magnetic properties of magnetic multi-core particles were determined by numerical inversion of small angle scattering and isothermal magnetisation data. The investigated particles consist of iron oxide nanoparticle cores (9 nm) embedded in poly(styrene) spheres (160 nm). A thorough physical characterisation of the particles included transmission electron microscopy, X-ray diffraction and asymmetrical flow field-flow fractionation. Their structure was ultimately disclosed by an indirect Fourier transform of static light scattering, small angle X-ray scattering and small angle neutron scattering data of the colloidal dispersion. The extracted pair distance distribution functions clearly indicated that the cores were mostly accumulated in the outer surface layers of the poly(styrene) spheres. To investigate the magnetic properties, the isothermal magnetisation curves of the multi-core particles (immobilised and dispersed in water) were analysed. The study stands out by applying the same numerical approach to extract the apparent moment distributions of the particles as for the indirect Fourier transform. It could be shown that the main peak of the apparent moment distributions correlated to the expected intrinsic moment distribution of the cores. Additional peaks were observed which signaled deviations of the isothermal magnetisation behavior from the non-interacting case, indicating weak dipolar interactions.

  • 3.
    Fall, Andreas
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Zhao, Wei
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Blademo, Åsa
    RISE Research Institutes of Sweden.
    Bodelsson, Jens
    RISE Research Institutes of Sweden.
    Sugunan, Abhilash
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Nordgren, Niklas
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Abitbol, Tiffany
    RISE Research Institutes of Sweden.
    Carlmark, Anna
    RISE Research Institutes of Sweden.
    Gillgren, Thomas
    RISE Research Institutes of Sweden.
    Hybrid Materials of Nanocellulose and Graphene2019Inngår i: International Conference on Nanotechnology for Renewable Materials 2019, TAPPI Press , 2019, Vol. 2, s. 1069-1080Konferansepaper (Fagfellevurdert)
  • 4.
    Gavilán, Helena
    et al.
    CSIC Instituto de Ciencia de Materiales de Madrid, Spain.
    Kowalski, Anja
    Micromod Partikeltechnologie GmbH, Germany.
    Heinke, David
    NanoPET Pharma GmbH, Germany.
    Sugunan, Abhilash
    RISE - Research Institutes of Sweden, Biovetenskap och material, Kemi och material.
    Sommertune, Jens
    RISE - Research Institutes of Sweden, Biovetenskap och material, Kemi och material.
    Varón, Miriam
    DTU Technical University of Denmark, Denmark.
    Bogart, Lara K.
    UCL University College London, UK.
    Posth, Oliver
    PTB Physikalisch-Technische Bundesanstalt, Germany.
    Zeng, Lunjie
    Chalmers University of Technology, Sweden.
    González-Alonso, David
    University of Cantabria, Spain.
    Balceris, Chrsitoph
    TU Braunschweig, Germany.
    Fock, Jeppe
    DTU Technical University of Denmark, Denmark.
    Wetterskog, Erik
    Uppsala University, Sweden.
    Frandsen, Cathrine
    DTU Technical University of Denmark, Denmark.
    Gehrke, Nicole
    NanoPET Pharma GmbH, Germany.
    Grüttner, Cordula
    Micromod Partikeltechnologie GmbH, Germany.
    Fornara, Andrea
    RISE - Research Institutes of Sweden, Biovetenskap och material, Kemi och material.
    Ludwig, Frank
    TU Braunschweig, Germany.
    Veintemillas-Verdaguer, Sabino
    CSIC Instituto de Ciencia de Materiales de Madrid, Spain.
    Johansson, Christer
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Morales, M. Puerto
    CSIC Instituto de Ciencia de Materiales de Madrid, Spain.
    Colloidal Flower-Shaped Iron Oxide Nanoparticles: Synthesis Strategies and Coatings2017Inngår i: Particle & particle systems characterization, ISSN 0934-0866, E-ISSN 1521-4117, Vol. 34, nr 7, artikkel-id 1700094Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The assembly of magnetic cores into regular structures may notably influence the properties displayed by a magnetic colloid. Here, key synthesis parameters driving the self-assembly process capable of organizing colloidal magnetic cores into highly regular and reproducible multi-core nanoparticles are determined. In addition, a self-consistent picture that explains the collective magnetic properties exhibited by these complex assemblies is achieved through structural, colloidal, and magnetic means. For this purpose, different strategies to obtain flower-shaped iron oxide assemblies in the size range 25–100 nm are examined. The routes are based on the partial oxidation of Fe(OH)2, polyol-mediated synthesis or the reduction of iron acetylacetonate. The nanoparticles are functionalized either with dextran, citric acid, or alternatively embedded in polystyrene and their long-term stability is assessed. The core size is measured, calculated, and modeled using both structural and magnetic means, while the Debye model and multi-core extended model are used to study interparticle interactions. This is the first step toward standardized protocols of synthesis and characterization of flower-shaped nanoparticles.

  • 5.
    Lobov, Gleb S.
    et al.
    KTH Royal Institute of Technology, Sweden.
    Marinins, Aleksandrs
    KTH Royal Institute of Technology, Sweden.
    Etcheverry, Sebastian
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Zhao, Yichen
    KTH Royal Institute of Technology, Sweden.
    Vasileva, Elena
    KTH Royal Institute of Technology, Sweden.
    Sugunan, Abhilash
    RISE - Research Institutes of Sweden, Biovetenskap och material, Kemi och material.
    Laurell, Fredrik
    KTH Royal Institute of Technology, Sweden.
    Thylén, Lars
    Hewlett-Packard Enterprise Laboratories, USA; KTH Royal Institute of Technology, Sweden.
    Wosinski, Lech
    KTH Royal Institute of Technology, Sweden.
    Östling, Mikael
    KTH Royal Institute of Technology, Sweden.
    Toprak, Muhammet S.
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Direct birefringence and transmission modulation via dynamic alignment of P3HT nanofibers in an advanced opto-fluidic component2017Inngår i: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 7, nr 1, s. 52-61Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Poly-3-hexylthiophene (P3HT) nanofibers are semiconducting high-aspect ratio nanostructures with anisotropic absorption and birefringence properties found at different regions of the optical spectrum. In addition, P3HT nanofibers possess an ability to be aligned by an external electric field, while being dispersed in a liquid. In this manuscript we show that such collective ordering of nanofibers, similar to liquid crystal material, significantly changes the properties of transmitted light. With a specially fabricated opto-fluidic component, we monitored the phase and transmission modulation of light propagating through the solution of P3HT nanofibers, being placed in the electric field with strength up to 0.1 V/μm. This report describes a technique for light modulation, which can be implemented in optical fiber-based devices or on-chip integrated components.

  • 6.
    Lobov, Gleb S.
    et al.
    KTH Royal Institute of Technology, Sweden.
    Zhao, Yichen
    KTH Royal Institute of Technology, Sweden.
    Marinins, Aleksandrs
    KTH Royal Institute of Technology, Sweden.
    Yan, M.
    KTH Royal Institute of Technology, Sweden.
    Li, Jiantong
    KTH Royal Institute of Technology, Sweden.
    Sugunan, Abhilash
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor.
    Thylén, Lars
    Hewlett-Packard, USA; KTH Royal Institute of Technology, Sweden.
    Wosinski, Lech
    KTH Royal Institute of Technology, Sweden.
    Östling, Mikael
    KTH Royal Institute of Technology, Sweden.
    Toprak, Muhammet Sadaka
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei Yu
    KTH Royal Institute of Technology, Sweden.
    Optical birefringence from P3HT nanofibers in alternating electric field2016Inngår i: Optics InfoBase Conference Papers, OSA - The Optical Society , 2016Konferansepaper (Fagfellevurdert)
    Abstract [en]

    AC poling allowing to control the orientation of P3HT nanofibers, result in strong optical birefringence with promising implementation in a novel type of optical modulator, without necessary embedding into any hosting matrix, e.g. liquid crystal.

  • 7.
    Lobov, Gleb S.
    et al.
    KTH Royal Institute of Technology, Sweden.
    Zhao, Yichen
    KTH Royal Institute of Technology, Sweden.
    Marinins, Aleksandrs
    KTH Royal Institute of Technology, Sweden.
    Yan, Max
    KTH Royal Institute of Technology, Sweden.
    Li, Jiantong
    KTH Royal Institute of Technology, Sweden.
    Toprak, Muhammet Sadaka
    KTH Royal Institute of Technology, Sweden.
    Sugunan, Abhilash
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.
    Thylen, Lars
    Hewlett-Packard Laboratories, US; KTH Royal Institute of Technology, Sweden.
    Wosinski, Lech
    KTH Royal Institute of Technology, Sweden.
    Östling, Mikael
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Electric field induced optical anisotropy of P3HT nanofibers in a liquid solution2015Inngår i: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 5, nr 11, s. 2642-2647Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The nanofiber morphology of regioregular Poly-3- hexylthiophene (P3HT) is a 1D crystalline structure organized by π - π stacking of the backbone chains. In this study, we report the impact of electric field on the orientation and optical properties of P3HT nanofibers dispersed in liquid solution. We demonstrate that alternating electric field aligns nanofibers, whereas static electric field forces them to migrate towards the cathode. The alignment of nanofibers introduces anisotropic optical properties, which can be dynamically manipulated until the solvent has evaporated. Time resolved spectroscopic measurements revealed that the electro-optical response time decreases significantly with the magnitude of applied electric field. Thus, for electric field 1.3 V ·μm-1 the response time was measured as low as 20 ms, while for 0.65 V ·μm-1 it was 110-150 ms. Observed phenomenon is the first mention of P3HT supramolecules associated with electrooptical effect. Proposed method provides real time control over the orientation of nanofibers, which is a starting point for a novel practical implementation. With further development P3HT nanofibers can be used individually as an anisotropic solution or as an active component in a guest-host system.

  • 8.
    Lobov, Gleb S.
    et al.
    KTH Royal Institute of Technology, Sweden.
    Zhao, Yichen
    KTH Royal Institute of Technology, Sweden.
    Marinins, Aleksandrs
    KTH Royal Institute of Technology, Sweden.
    Yan, Max
    KTH Royal Institute of Technology, Sweden.
    Li, Jiantong
    KTH Royal Institute of Technology, Sweden.
    Toprak, Muhammet Sadaka
    KTH Royal Institute of Technology, Sweden.
    Sugunan, Abhilash
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.
    Thylen, Lars
    Hewlett-Packard Laboratories, US; KTH Royal Institute of Technology, Sweden.
    Wosinski, Lech
    KTH Royal Institute of Technology, Sweden.
    Östling, Mikael
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Electro-optical response of P3HT nanofibers in liquid solution2015Inngår i: Asia Communications and Photonics Conference 2015, Optical Society of America, 2015, artikkel-id ASu1A.5Konferansepaper (Fagfellevurdert)
    Abstract [en]

    AC electric poling introduces in P3HT nanofibers anisotropic electro-optical response and birefringence. Along with birefringence, such material exhibits strong amplitude modulation which makes it more efficient alternative to liquid crystals.

  • 9.
    Lobov, Gleb S.
    et al.
    KTH Royal Institute of Technology, Sweden.
    Zhao, Yichen
    KTH Royal Institute of Technology, Sweden.
    Marinins, Aleksandrs
    KTH Royal Institute of Technology, Sweden.
    Yan, Min
    KTH Royal Institute of Technology, Sweden.
    Li, Jiantong
    KTH Royal Institute of Technology, Sweden.
    Sugunan, Abhilash
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.
    Thylén, Lars
    Hewlett-Packard Laboratories, US; KTH Royal Institute of Technology, Sweden.
    Wosinski, Lech
    KTH Royal Institute of Technology, Sweden.
    Östling, Mikael
    KTH Royal Institute of Technology, Sweden.
    Toprak, Muhammet S.
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Size impact of ordered P3HT nanofibers on optical anisotropy2016Inngår i: Macromolecular Chemistry and Physics, ISSN 1022-1352, E-ISSN 1521-3935, Vol. 217, nr 9, s. 1089-1095Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Poly-3-hexylthiophene (P3HT) nanofibers are 1D crystalline structures with semiconductor properties. When P3HT nanofibers are dispersed in nonconducting solvent, they react to external alternate electric field by aligning along the field lines. This can be used to create layers of ordered nanofibers and is referred to as alternating current poling method. P3HT nanofibers with three different size distributions are fabricated, using self-assembly mechanism in marginal solvents, and used for the alignment studies. Anisotropic absorption of oriented 2 μm long nanofibers exponentially increases with the magnitude of applied field to a certain asymptotic limit at 0.8 V μm-1, while 100-500 nm long nanofibers respond to electric field negligibly. Effective optical birefringence of oriented 2 μm long nanofibers is calculated, based on the phase shift at 633 nm and the average layer thickness, to be 0.41. These results combined with further studies on real-time control over orientation of P3HT nanofibers in liquid solution or host system are promising in terms of exploiting them in electroabsorptive and electrorefractive applications.

  • 10.
    Lobov, Gleb S.
    et al.
    KTH Royal Institute of Technology, Sweden.
    Zhao, Yichen
    KTH Royal Institute of Technology, Sweden.
    Marinins, Alexandrs
    KTH Royal Institute of Technology, Sweden.
    Yan, Min
    KTH Royal Institute of Technology, Sweden.
    Li, Jiantong
    KTH Royal Institute of Technology, Sweden.
    Sugunan, Abhilash
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.
    Thylén, Lars
    Hewlett-Packard Laboratories, US; KTH Royal Institute of Technology, Sweden.
    Wosinski, Lech
    KTH Royal Institute of Technology, Sweden.
    Östling, Mikael
    KTH Royal Institute of Technology, Sweden.
    Toprak, Muhammet S.
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Dynamic manipulation of optical anisotropy of suspended Poly-3-hexylthiophene nanofibers2016Inngår i: Advanced Optical Materials, ISSN 2162-7568, E-ISSN 2195-1071, Vol. 4, nr 10, s. 1651-1656Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Poly-3-hexylthiophene (P3HT) nanofibers are 1D crystalline semiconducting nanostructures, which are known for their application in photovoltaics. Due to the internal arrangement, P3HT nanofibers possess optical anisotropy, which can be enhanced on a macroscale if nanofibers are aligned. Alternating electric field, applied to a solution with dispersed nanofibers, causes their alignment and serves as a method to produce solid layers with ordered nanofibers. The transmission ellipsometry measurements demonstrate the dichroic absorption and birefringence of ordered nanofibers in a wide spectral range of 400–1700 nm. Moreover, the length of nanofibers has a crucial impact on their degree of alignment. Using electric birefringence technique, it is shown that external electric field applied to the solution with P3HT nanofibers can cause direct birefringence modulation. Dynamic alignment of dispersed nanofibers changes the refractive index of the solution and, therefore, the polarization of transmitted light. A reversible reorientation of nanofibers is organized by using a quadrupole configuration of poling electrodes. With further development, the described method can be used in the area of active optical fiber components, lab-on-chip or sensors. It also reveals the potential of 1D conducting polymeric structures as objects whose highly anisotropic properties can be implemented in electro-optical applications.​.

  • 11.
    Majee, Subimal
    et al.
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Zhao, Wei
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign. Uppsala University, Sweden.
    Sugunan, Abhilash
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Gillgren, .T
    BillerudKorsnäs AB, Sweden.
    Larsson, J. A.
    BillerudKorsnäs AB, Sweden.
    Brooke, Robert
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Nordgren, Niklas
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Zhang, Z. -B
    Uppsala University, Sweden.
    Zhang, S. -L
    Uppsala University, Sweden.
    Nilsson, David
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Ahniyaz, Anwar
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Highly Conductive Films by Rapid Photonic Annealing of Inkjet Printable Starch–Graphene Ink2021Inngår i: Advanced Materials Interfaces, ISSN 2196-7350, Vol. 9, nr 5, artikkel-id 2101884Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A general formulation engineering method is adopted in this study to produce a highly concentrated (≈3 mg mL−1) inkjet printable starch–graphene ink in aqueous media. Photonic annealing of the starch–graphene ink is validated for rapid post-processing of printed films. The experimental results demonstrate the role of starch as dispersing agent for graphene in water and photonic pulse energy in enhancing the electrical properties of the printed graphene patterns, thus leading to an electrical conductivity of ≈2.4 × 104 S m−1. The curing mechanism is discussed based on systematic material studies. The eco-friendly and cost-efficient approach presented in this work is of technical potential for the scalable production and integration of conductive graphene inks for widespread applications in printed and flexible electronics. 

  • 12.
    Sommertune, Jens
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.
    Sugunan, Abhilash
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.
    Ahniyaz, Anwar
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.
    Stjernberg Bejhed, Rebecca
    Uppsala University, Sweden.
    Sarwe, Anna
    RISE., Swedish ICT, Acreo.
    Johansson, Christer
    RISE., Swedish ICT, Acreo.
    Balceris, Cristoph
    Technische Universität Braunschweig, Germany.
    Ludwig, Frank
    Technische Universität Braunschweig, Germany.
    Posth, Oliver
    PTB Physikalisch-Technische Bundesanstalt, Germany.
    Fornara, Andrea
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.
    Polymer/iron oxide nanoparticle composites—A straight forward and scalable synthesis approach2015Inngår i: International Journal of Molecular Sciences, ISSN 1661-6596, E-ISSN 1422-0067, Vol. 16, nr 8, s. 19752-19768Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Magnetic nanoparticle systems can be divided into single-core nanoparticles (with only one magnetic core per particle) and magnetic multi-core nanoparticles (with several magnetic cores per particle). Here, we report multi-core nanoparticle synthesis based on a controlled precipitation process within a well-defined oil in water emulsion to trap the superparamagnetic iron oxide nanoparticles (SPION) in a range of polymer matrices of choice, such as poly(styrene), poly(lactid acid), poly(methyl methacrylate), and poly(caprolactone). Multi-core particles were obtained within the Z-average size range of 130 to 340 nm. With the aim to combine the fast room temperature magnetic relaxation of small individual cores with high magnetization of the ensemble of SPIONs, we used small (<10 nm) core nanoparticles. The performed synthesis is highly flexible with respect to the choice of polymer and SPION loading and gives rise to multi-core particles with interesting magnetic properties and magnetic resonance imaging (MRI) contrast efficacy.

  • 13.
    Zhao, Wei
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign. Uppsala University, Sweden.
    Sugunan, Abhilash
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Gillgren, Thomas
    BillerudKorsnäs AB, Sweden.
    Larsson, Johan A
    BillerudKorsnäs AB,Sweden.
    Zhang, Zhi-Bin
    Uppsala University, Sweden.
    Zhang, Shi-Li
    Uppsala University, Sweden.
    Sommertune, Jens
    RISE Research Institutes of Sweden.
    Dobryden, Illia
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Ahniyaz, Anwar
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Surfactant-free starch-graphene composite films as simultaneous oxygen and water vapour barriers2022Inngår i: npj 2D Materials and Applications, ISSN 2397-7132, Vol. 6, nr 1, artikkel-id 20Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A single coating formulation for multifunctional composites, such as a gas barrier against both oxygen and water vapour, is the holy grail for the packaging industry. Since the last decade, graphene has been touted as the ideal barrier material in composites due to its morphology and impermeability to all gases. However, this prospect is limited by either poor dispersion of graphene or excess surfactants to aid the dispersion, both leading to shortcuts that allow gas permeation through the composite. Here, we demonstrate a combined gas barrier with starch-graphene composite films made from a single formulation of surfactant-free starch nanoparticle-stabilized graphene dispersion (2.97 mg mL−1). Hence, the incorporated graphene reduces the permeability of both the oxygen and the water vapour by over 70% under all the relative humidity conditions tested. Moreover, these films are foldable and electrically conductive (9.5 S m−1). Our surfactant-free approach of incorporating graphene into an industrially important biopolymer is highly relevant to the packaging industry, thus offering cost-effective and water-based solution depositions of multifunctional composite films for wide-ranging applications, such as gas barriers in food packaging. © 2022, The Author(s).

  • 14.
    Zhao, Wei
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Sugunan, Abhilash
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Gillgren, Thomas
    BillerudKorsnäs AB, Sweden.
    Larsson, Johan
    BillerudKorsnäs AB, Sweden.
    Zhang, Zhi-Bin
    Uppsala University, Sweden.
    Zhang, Shi-Li
    Uppsala University, Sweden.
    Niklas, Nordgren
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Sommertune, Jens
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Ahniyaz, Anwar
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Surfactant-Free Stabilization of Aqueous Graphene Dispersions Using Starch as a Dispersing Agent2021Inngår i: ACS Omega, E-ISSN 2470-1343, Vol. 6, nr 18, s. 12050-12062Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Attention to graphene dispersions in water with the aid of natural polymers is increasing with improved awareness of sustainability. However, the function of biopolymers that can act as dispersing agents in graphene dispersions is not well understood. In particular, the use of starch to disperse pristine graphene materials deserves further investigation. Here, we report the processing conditions of aqueous graphene dispersions using unmodified starch. We have found that the graphene content of the starch-graphene dispersion is dependent on the starch fraction. The starch-graphene sheets are few-layer graphene with a lateral size of 3.2 μm. Furthermore, topographical images of these starch-graphene sheets confirm the adsorption of starch nanoparticles with a height around 5 nm on the graphene surface. The adsorbed starch nanoparticles are ascribed to extend the storage time of the starch-graphene dispersion up to 1 month compared to spontaneous aggregation in a nonstabilized graphene dispersion without starch. Moreover, the ability to retain water by starch is reduced in the presence of graphene, likely due to environmental changes in the hydroxyl groups responsible for starch-water interactions. These findings demonstrate that starch can disperse graphene with a low oxygen content in water. The aqueous starch-graphene dispersion provides tremendous opportunities for environmental-friendly packaging applications. © 2021 American Chemical Society.

  • 15.
    Zhao, Wei
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Biovetenskap och material, Yta, process och formulering. Uppsala University, Sweden.
    Sugunan, Abhilash
    RISE - Research Institutes of Sweden (2017-2019), Biovetenskap och material, Yta, process och formulering.
    Zhang, Zhi-Bin
    Uppsala University, Sweden.
    Ahniyaz, Anwar
    RISE - Research Institutes of Sweden (2017-2019), Biovetenskap och material, Yta, process och formulering.
    Graphene and Flavin Mononucleotide Interaction in Aqueous Graphene Dispersions2019Inngår i: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 123, nr 43, s. 26282-26288Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A fundamental understanding of the interaction between graphene and a stabilizer is needed for the development of stable aqueous graphene dispersions. Here, we studied the interaction of graphene with the FMN in water. The UV-vis absorption spectra revealed blue shifts of the FMN absorption bands II (374 nm) and I (445 nm) in the presence of graphene. Furthermore, Fourier transform IR anal. showed that the graphene also upshifted the FMN vibration modes C10a=N1 and C4a=N5, which correspond to the FMN isoalloxazine binding sites N(1) and N(5), resp. In addition, thermogravimetric anal. showed that the thermal stability of graphene was enhanced by the adsorbed FMN, which supports the strong interaction. These results confirm that FMN adsorbs on the graphene surface in parallel conformation and hinders hydrogen bonding at the FMN isoalloxazine binding sites.

  • 16. Zhao, Y.
    et al.
    Sugunan, Abhilash
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.
    Muhammed, M.
    Toprak, M. S.
    Synthesis of nanostructured antimony telluride for thermoelectric applications2015Inngår i: Materials Research Society Symposium Proceedings, 2015, Vol. 1742, s. 1-6Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Thermoelectric (TE) materials have been studied during past decades since they can generate electricity directly from waste heat. Antimony chalcogenides (Sb2M3, M = S, Se, Te) are well known as one of the promising candidates among the inorganic TE materials. We report on the synthesis of Sb2Te3 nanoparticle via thermolysis method. A systematic study was done to investigate the effect of reaction time and ratio between the precursors as well as the method of cooling on the morphology and composition of obtained nanoparticles. The ratio between precursors was varied to study the effect on the morphology. Furthermore, the high purity phase Sb2Te3 was obtained by a rapid cooling process.

  • 17.
    Zhao, Yichen
    et al.
    KTH Royal Institute of Technology, Sweden.
    Sugunan, Abhilash
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik. KTH Royal Institute of Technology, Sweden.
    Schmidt, Torsten
    KTH Royal Institute of Technology, Sweden.
    Fornara, Andrea
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor.
    Toprak, Muhammet Sadaka
    KTH Royal Institute of Technology, Sweden.
    Muhammed, Mamoun A.
    KTH Royal Institute of Technology, Sweden.
    Relaxation is the key to longer life: Suppressed degradation of P3HT films on conductive substrates2014Inngår i: Journal of Materials Chemistry A, ISSN 2050-7488, E-ISSN 2050-7496, Vol. 2, nr 33, s. 13270-13276Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Here we show the dependence of the degree of degradation of poly-3-hexylthiophene (P3HT) films on the conductivity of the supporting substrate. P3HT is widely used for organic solar cells and electronic devices because it allows simple, low cost fabrication and has potential for the fabrication of flexible devices. However, P3HT is known to have a relatively low photostability, and investigating the photodegradation mechanism is an active research field. We find that P3HT films on conductive substrates show significantly retarded degradation and retain their chemical and morphological features when compared to similar films on glass substrates. This 'substrate effect' in retarding the degradation of P3HT films is evident even upon prolonged exposure to air for up to five months. 

  • 18.
    Zhao, Yichen
    et al.
    KTH Royal Institute of Technology, Sweden.
    Sugunan, Abhilash
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.
    Wang, Qin
    RISE., Swedish ICT, Acreo.
    Yang, Xuran
    KTH Royal Institute of Technology, Sweden.
    Rihtnesberg, David B.
    RISE., Swedish ICT, Acreo.
    Toprak, Muhammet S.
    KTH Royal Institute of Technology, Sweden.
    Direct Determination of Spatial Localization of Carriers in CdSe-CdS Quantum Dots2015Inngår i: Journal of Nanomaterials, ISSN 1687-4110, E-ISSN 1687-4129, Vol. 2015, artikkel-id 321354Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Colloidal quantum dots (QDs) have gained significant attention due to their tunable band gap, simple solution processability, ease of scale-up, and low cost. By carefully choosing the materials, core-shell heterostructure QDs (HQDs) can be further synthesized with a controlled spatial spread of wave functions of the excited electrons and holes for various applications. Many investigations have been done to understand the exciton dynamics by optical characterizations. However, these spectroscopic data demonstrate that the spatial separation of the excitons cannot distinguish the distribution of excited electrons and holes. In this work, we report a simple and direct method to determine the localized holes and delocalized electrons in HQDs. The quasi-type-II CdSe-CdS core-shell QDs were synthesized via a thermolysis method. Poly(3-hexylthiophene) (P3HT) nanofiber and ZnO nanorods were selected as hole and electron conductor materials, respectively, and were combined with HQDs to form two different nanocomposites. Photoelectrical properties were evaluated under different environments via a quick and facile characterization method, confirming that the electrons in the HQDs were freely accessible at the surface of the nanocrystal, while the holes were confined within the CdSe core.

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