Endre søk
Begrens søket
1 - 19 of 19
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Treff pr side
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
Merk
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 1.
    Ahmed, Fareed
    et al.
    Linköping University, Sweden.
    Ding, Penghui
    Linköping University, Sweden.
    Ail, Ujwala
    Linköping University, Sweden.
    Warczak, Magdalena
    Linköping University, Sweden.
    Grimoldi, Andrea
    Linköping University, Sweden.
    Ederth, Thomas
    Linköping University, Sweden.
    Håkansson, Karl
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Vagin, Mikhail
    Linköping University, Sweden.
    Gueskine, Viktor
    Linköping University, Sweden.
    Berggren, Magnus
    Linköping University, Sweden.
    Crispin, Xavier
    Linköping University, Sweden.
    Manufacturing Poly(3,4-Ethylenedioxythiophene) Electrocatalytic Sheets for Large-Scale H2O2 Production2022Inngår i: Advanced Sustainable Systems, ISSN 2366-7486, Vol. 6, nr 1, artikkel-id 2100316Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Producing thick films of conducting polymers by a low-cost manufacturing technique would enable new applications. However, removing huge solvent volume from diluted suspension or dispersion (1–3 wt%) in which conducting polymers are typically obtained is a true manufacturing challenge. In this work, a procedure is proposed to quickly remove water from the conducting polymer poly(3,4-ethylenedioxythiophene:poly(4-styrene sulfonate) (PEDOT:PSS) suspension. The PEDOT:PSS suspension is first flocculated with 1 m H2SO4 transforming PEDOT nanoparticles (≈50–500 nm) into soft microparticles. A filtration process inspired by pulp dewatering in a paper machine on a wire mesh with apertures dimension between 60 µm and 0.5 mm leads to thick free-standing films (≈0.5 mm). Wire mesh clogging that hinders dewatering (known as dead-end filtration) is overcome by adding to the flocculated PEDOT:PSS dispersion carbon fibers that aggregate and form efficient water channels. Moreover, this enables fast formation of thick layers under simple atmospheric pressure filtration, thus making the process truly scalable. Thick freestanding PEDOT films thus obtained are used as electrocatalysts for efficient reduction of oxygen to hydrogen peroxide, a promising green chemical and fuel. The inhomogeneity of the films does not affect their electrochemical function. © 2021 The Authors. 

  • 2.
    Belaineh, Dagmawi
    et al.
    Linköping University, Sweden.
    Andreasen, Jens W
    DTU Technical University of Denmark, Denmark.
    Palisaitis, Justinas
    Linköping University, Sweden.
    Malti, Abdellah
    KTH Royal institute of Technology, Sweden.
    Håkansson, Karl
    RISE - Research Institutes of Sweden, Bioekonomi, Bioraffinaderi och energi.
    Wågberg, Lars
    KTH Royal institute of Technology, Sweden.
    Crispin, Xavier
    Linköping university, Sweden.
    Engquist, Isak
    Linköping university, Sweden.
    Berggren, Magnus
    Linköping university, Sweden.
    Controlling the Organization of PEDOT:PSS on Cellulose Structures2019Inngår i: ACS Applied Polymer Materials, Vol. 1, nr 9, s. 2342-2351Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Composites of biopolymers and conducting polymers are emerging as promising candidates for a green technological future and areactively being explored in various applications, such as in energy storage ,bioelectronics, and thermoelectrics. While the device characteristics of these composites have been actively investigated, there is limited knowledge concerning the fundamental intracomponent interactions and the modes of molecular structuring. Here, by use of cellulose and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), it is shown that the chemical and structural makeup of the surfaces of the composite components are critical factors that determine the materials organization at relevant dimensions. AFM, TEM, and GIWAXS measurements show that when mixedwith cellulose nanofibrils, PEDOT:PSS organizes into continuous nanosized beadlike structures with an average diameter of 13 nm on the nanofibrils. In contrast, when PEDOT:PSS is blended with molecular cellulose, a phase-segregated conducting network morphology is reached, with a distinctly relatively lower electric conductivity. These results provide insight into the mechanisms ofPEDOT:PSS crystallization and may have significant implications for the design of conducting biopolymer composites for a vast array of applications.

  • 3.
    Belaineh Yilma, Dagmawi
    et al.
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Brooke, Robert
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Sani, Negar
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Say, Mehmet
    Linköping University, Sweden.
    Håkansson, Karl MO
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Engquist, Isak
    Linköping University, Sweden.
    Berggren, Magnus
    Linköping University, Sweden.
    Edberg, Jesper
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Printable carbon-based supercapacitors reinforced with cellulose and conductive polymers2022Inngår i: Journal of Energy Storage, ISSN 2352-152X, E-ISSN 2352-1538, Vol. 50, artikkel-id 104224Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Sustainable electrical energy storage is one of the most important scientific endeavors of this century. Battery and supercapacitor technologies are here crucial, but typically the current state of the art suffers from either lack of large-scale production possibilities, sustainability or insufficient performance and hence cannot match growing demands in society. Paper and cellulosic materials are mature scalable templates for industrial roll-to-roll production. Organic materials, such as conducting polymers, and carbon derivatives are materials that can be synthesized or derived from abundant sources. Here, we report the combination of cellulose, PEDOT:PSS and carbon derivatives for bulk supercapacitor electrodes adapted for printed electronics. Cellulose provides a mesoscopic mesh for the organization of the active ingredients. Furthermore, the PEDOT:PSS in combination with carbon provides superior device characteristics when comparing to the previously standard combination of activated carbon and carbon black. PEDOT:PSS acts as a mixed ion-electron conducting glue, which physically binds activated carbon particles together, while at the same time facilitating swift transport of both electrons and ions. A surprisingly small amount (10%) of PEDOT:PSS is needed to achieve an optimal performance. This work shows that cellulose added to PEDOT:PSS-carbon enables high-performing, mechanically stable, printed supercapacitor electrodes using a combination of printing methods.

  • 4.
    Breijaert, T. C.
    et al.
    SLU Swedish University of Agricultural Sciences, Sweden.
    Daniel, G.
    SLU Swedish University of Agricultural Sciences, Sweden.
    Hedlund, D.
    Uppsala University, Sweden.
    Svedlindh, P.
    Uppsala University, Sweden.
    Kessler, V. G.
    SLU Swedish University of Agricultural Sciences, Sweden.
    Granberg, Hjalmar
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Håkansson, Karl
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Seisenbaeva, G. A.
    SLU Swedish University of Agricultural Sciences, Sweden.
    Self-assembly of ferria – nanocellulose composite fibres2022Inngår i: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 291, artikkel-id 119560Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    An environmentally benign synthesis of a magnetically responsive carboxymethylated cellulose nanofibril-based material is reported. Applied experimental conditions lead to the in-situ formation of magnetite nanoparticles with primary particle sizes of 2.0–4.0 nm or secondary particles of 3.6–16.4 nm depending on whether nucleation occurred between individual carboxymethylated cellulose nanofibrils, or on exposed fibril surfaces. The increase in magnetite particle size on the cellulose fibril surfaces was attributed to Ostwald ripening, while the small particles formed within the carboxymethyl cellulose aggregates were presumably due to steric interactions. The magnetite nanoparticles were capable of coordinating to carboxymethylated cellulose nanofibrils to form large “fibre-like” assemblies. The confinement of small particles within aggregates of reductive cellulose molecules was most likely responsible for excellent conservation of magnetic characteristics on storage of this material. The possibility for using the material in drug delivery applications with release rate controlled by daylight illumination is presented. © 2022 The Author(s)

  • 5.
    Brooke, Robert
    et al.
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Lay, M
    Linköping University, Sweden; Leibniz Institute for New Materials, Germany.
    Jain, K
    KTH Royal Institute of Technology, Sweden.
    Francon, H
    KTH Royal Institute of Technology, Sweden.
    Say, Mehmet
    Linköping University, Sweden.
    Belaineh Yilma, Dagmawi
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Wang, Xin
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Håkansson, Karl
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Wågberg, L
    KTH Royal Institute of Technology, Sweden.
    Engquist, I
    Linköping University, Sweden; .
    Edberg, Jesper
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Berggren, M
    Linköping University, Sweden.
    Nanocellulose and PEDOT:PSS composites and their applications2023Inngår i: Polymer Reviews, ISSN 1558-3724, nr 2, s. 437-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The need for achieving sustainable technologies has encouraged research on renewable and biodegradable materials for novel products that are clean, green, and environmentally friendly. Nanocellulose (NC) has many attractive properties such as high mechanical strength and flexibility, large specific surface area, in addition to possessing good wet stability and resistance to tough chemical environments. NC has also been shown to easily integrate with other materials to form composites. By combining it with conductive and electroactive materials, many of the advantageous properties of NC can be transferred to the resulting composites. Conductive polymers, in particular poly(3,4-ethylenedioxythiophene:poly(styrene sulfonate) (PEDOT:PSS), have been successfully combined with cellulose derivatives where suspensions of NC particles and colloids of PEDOT:PSS are made to interact at a molecular level. Alternatively, different polymerization techniques have been used to coat the cellulose fibrils. When processed in liquid form, the resulting mixture can be used as a conductive ink. This review outlines the preparation of NC/PEDOT:PSS composites and their fabrication in the form of electronic nanopapers, filaments, and conductive aerogels. We also discuss the molecular interaction between NC and PEDOT:PSS and the factors that affect the bonding properties. Finally, we address their potential applications in energy storage and harvesting, sensors, actuators, and bioelectronics. © 2022 The Author(s). 

  • 6.
    Fall, Andreas
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Hagel, Farnaz
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Edberg, Jesper
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Malti, Abdellah
    KTH Royal Institute of Technology, Sweden.
    Larsson, Per A.
    KTH Royal Institute of Technology, Sweden.
    Wågberg, Lars
    KTH Royal Institute of Technology, Sweden; Wallenberg Wood Science Center, Sweden; Digital Cellulose Center, Sweden.
    Granberg, Hjalmar
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Håkansson, Karl MO
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Spinning of Stiff and Conductive Filaments from Cellulose Nanofibrils and PEDOT:PSS Nanocomplexes2022Inngår i: ACS Applied Polymer Materials, ISSN 2637-6105, Vol. 4, nr 6, s. 4119-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Research in smart textiles is growing due to the increased demand from the healthcare sector and people's urge to keep track of and analyze the signals and metrics from their bodies. Electrically conductive filaments are the most fundamental material for smart textiles. These filaments can be imbued with functionalities and useful in fields like energy storage, sensing, and actuation. To be able to meet the requirements that the latter applications require, fabrication techniques must be developed to provide better processability and sustainability in a cost-effective manner. Here, a mixture of a conductive polymer, poly(3,4-ethylenedioxythiophene) (PEDOT), and biobased cellulose nanofibrils (CNFs) was used to spin filaments utilizing a water-based process. These filaments show electrical conductivities up to 150 S/cm and tensile stiffness of 20 GPa. Interestingly, the PEDOT aligned to a similar degree as the CNFs during the spinning process without a drawing step, which is hypothesized to be caused by the attachment of PEDOT on the CNFs. Lastly, the filaments were tested in an organic electrochemical transistor (OECT) configuration, which resulted in a working device with an on/off ratio approaching 1500. Furthermore, the OECT exhibited stable behavior when changing temperature (20-80 °C) and relative humidity (40-80%). This aqueous spinning method, resulting in filaments with robust electronic properties in different temperature and humidity environments, show greats promise for future innovative smart textiles.

  • 7.
    Granberg, Hjalmar
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Bioekonomi, Papperstillverkning och förpackningar.
    Håkansson, Karl
    RISE - Research Institutes of Sweden (2017-2019), Bioekonomi, Papperstillverkning och förpackningar.
    Fall, Andreas
    RISE - Research Institutes of Sweden (2017-2019), Bioekonomi, Papperstillverkning och förpackningar.
    Wågberg, Pia
    RISE - Research Institutes of Sweden (2017-2019), Bioekonomi, Papperstillverkning och förpackningar.
    Electroactive papers, films, filaments, aerogels and hydrogels to realize the future of bio-based electronics2019Inngår i: PaperCon 2019: Proceedings, TAPPI Press, 2019, artikkel-id PF4.1Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Research has been undertaken into the mixing of electroactive additives (EAA), for example, conducting polymers or particles, in five different cellulose structures and their further processing into electroactive papers and films. The cellulose structures considered included cellulose nanofibrils (CNF) hydrogels, CNG aerogels, CNF filaments, CNF films and cellulose papers. It has been demonstrated that the cellulose structure in combination with the electroactive polymer or particle, could be used to tailor numerous different properties. The cellulose could provide properties that support structural integrity, processability, ionic conductivity, shapeability and a large inner capacitive surface. The highly porous aerogel particles could be shaped using three-dimensional printed templates prior to freezing. The particles could be filled either with active material from the start before freeze-linking or filled with active material afterwards based on the layer by layer method. Electroactive paper could also be produced by adding the active component directly as a filler during papermaking, by adding CNF spun EA filaments cut into conveniently long staple fibres.

  • 8.
    Granberg, Hjalmar
    et al.
    RISE - Research Institutes of Sweden, Bioekonomi, Papperstillverkning och förpackningar.
    Sandberg, Mats
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Håkansson, Karl
    RISE - Research Institutes of Sweden, Bioekonomi, Bioraffinaderi och energi.
    Pilot scale production of interactive zinc oxide paper and its multiple applicability2019Inngår i: PaperCon 2019: Proceedings, TAPPI Press, 2019, artikkel-id PF3.3Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    A study has been made of the production of zinc oxide (ZnO) paper in a pilot paper machine. Bleached sulphate softwood pulp (70%) and bleached sulphate hardwood pulp (30%) were corefined. Cationic polyacrylamide (CPAM) was used as retention agent, while alkyl ketene dimer (AKD) was used as sizing agent for some samples. Some papers were screen printed with a conducting carbon-based ink to produce a photosensor device. Two methods were used to study the photocatalysis: immersing ZnO papers into kongo red dispersions or resazurin (Rz) based photocatalyst activity indicator ink and exposing the papers to ultraviolet (UV) light in a sunlight simulator. ZnO papers of approximately 60gsm were successfully produced on the pilot scale machine, which was run at a low speed (100m/min) and the retention of ZnO particles was good in all samples. The paper looked like an ordinary white printing paper product, but was a truly interactive material, exhibiting photoconductivity and enabling use as an excellent photosensor.

  • 9.
    Göhl, Johan
    et al.
    Fraunhofer-Chalmers Centre, Sweden.
    Markstedt, Kajsa
    Wallenberg Wood Science Center, Sweden ; Chalmers University of Technology, Sweden.
    Mark, Andreas
    Fraunhofer-Chalmers Centre, Sweden.
    Håkansson, Karl
    RISE - Research Institutes of Sweden, Bioekonomi, Bioraffinaderi och energi. Wallenberg Wood Science Center, Sweden ; Chalmers University of Technology, Sweden.
    Gatenholm, Paul
    Wallenberg Wood Science Center, Sweden ; Chalmers University of Technology, Sweden.
    Edelvik, Fredrik
    Fraunhofer-Chalmers Centre, Sweden.
    Simulations of 3D bioprinting: Predicting bioprintability of nanofibrillar inks2018Inngår i: Biofabrication, ISSN 1758-5082, E-ISSN 1758-5090, Vol. 10, nr 3, artikkel-id 034105Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    3D bioprinting with cell containing bioinks show great promise in the biofabrication of patient specific tissue constructs. To fulfil the multiple requirements of a bioink, a wide range of materials and bioink composition are being developed and evaluated with regard to cell viability, mechanical performance and printability. It is essential that the printability and printing fidelity is not neglected since failure in printing the targeted architecture may be catastrophic for the survival of the cells and consequently the function of the printed tissue. However, experimental evaluation of bioinks printability is time-consuming and must be kept at a minimum, especially when 3D bioprinting with cells that are valuable and costly. This paper demonstrates how experimental evaluation could be complemented with computer based simulations to evaluate newly developed bioinks. Here, a computational fluid dynamics simulation tool was used to study the influence of different printing parameters and evaluate the predictability of the printing process. Based on data from oscillation frequency measurements of the evaluated bioinks, a full stress rheology model was used, where the viscoelastic behaviour of the material was captured. Simulation of the 3D bioprinting process is a powerful tool and will help in reducing the time and cost in the development and evaluation of bioinks. Moreover, it gives the opportunity to isolate parameters such as printing speed, nozzle height, flow rate and printing path to study their influence on the printing fidelity and the viscoelastic stresses within the bioink. The ability to study these features more extensively by simulating the printing process will result in a better understanding of what influences the viability of cells in 3D bioprinted tissue constructs.

  • 10.
    Håkansson, Karl
    RISE - Research Institutes of Sweden, Bioekonomi.
    Anisotropy determination during assembly of nanocellulose fibrils into a gel thread2017Inngår i: International ConfeInternational Conference on Nanotechnology for Renewable Materials, TAPPI Press , 2017, Vol. 2, s. 787-797Konferansepaper (Annet vitenskapelig)
  • 11.
    Håkansson, Karl
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Effect of carboxymethylated cellulose nanofibril concentration regime upon material forming on mechanical properties in films and filaments2021Inngår i: Cellulose, ISSN 0969-0239, E-ISSN 1572-882X, Vol. 28, s. 881-895Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Abstract: It is predicted that the forest and materials from the forest will play an important role to enable the transformation from our linear present to a circular and sustainable future. Therefore, there is a need to understand the materials that can be extracted from the forest, and how to use them in an efficient manner. Here, carboxymethylated cellulose nanofibrils (CNF) from the forest are used to produce films and filaments with the aim to preserve the impressive mechanical properties of a single CNF in a macro-scale material. The mechanical properties of both the films (tensile strength of 231 MPa) and filaments (tensile strength of 645 MPa) are demonstrated to be maximized when the starting suspension is in a flowing state. This is a new insight with regards to filament spinning of CNF, and it is here argued that the three main factors contributing to the mechanical properties of the filaments are (1) the possibility to produce a self-supporting filament from a suspension, (2) the CNF alignment inside the filament and (3) the spatial homogeneity of the starting suspension. The results in this study could possibly also apply to other nanomaterials such as carbon nanotubes and silk protein fibrils, which are predicted to play a large part in future high performing applications. 

  • 12.
    Isacsson, Patrik
    et al.
    Linkoping University, Sweden.
    Jain, Karishma
    KTH Royal Institute of Technology, Sweden.
    Fall, Andreas
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Chauve, Valerie
    Ahlstrom-Munksjö Research Center, France.
    Hajian, Alireza
    KTH Royal Institute of Technology, Sweden.
    Granberg, Hjalmar
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Boiron, Lucie
    Ahlstrom-Munksjö Research Center, France.
    Berggren, Magnus
    Linköping University, Sweden.
    Håkansson, Karl
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Edberg, Jesper
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Engquist, Isak
    Linköping University, Sweden.
    Wågberg, Lars
    KTH Royal Institute of Technology, Sweden.
    Production of energy-storage paper electrodes using a pilot-scale paper machine2022Inngår i: Journal of Materials Chemistry A, ISSN 2050-7488, E-ISSN 2050-7496, Vol. 10, nr 40, s. 21579-21589Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The global efforts in electrifying our society drive the demand for low-cost and sustainable energy storage solutions. In the present work, a novel material concept was investigated to enable fabrication of several 10 meter-long rolls of supercapacitor paper electrodes on a pilot-scale paper machine. The material concept was based on cationized, cellulose-rich wood-derived fibres, conducting polymer PEDOT:PSS, and activated carbon filler particles. Cationic fibres saturated with anionic PEDOT:PSS provide a conducting scaffold hosting the activated carbon, which functions as the active charge-storage material. The response from further additives was systematically investigated for several critical paper properties. Cellulose nanofibrils were found to improve mechanical properties, while carbon black enhanced both the conductivity and the storage capacity of the activated carbon, reaching a specific capacitance of 67 F g−1. This pilot trial shows that “classical” papermaking methods are fit for the purpose and provides valuable insights on how to further advance bio-based energy storage solutions for large-scale applications.

  • 13.
    Markstedt, Kajsa
    et al.
    Chalmers University of Technology, Sweden.
    Håkansson, Karl
    RISE - Research Institutes of Sweden, Bioekonomi, Bioraffinaderi och energi.
    Toriz, Guillermo
    Chalmers University of Technology, Sweden; University of Guadalajara, Mexico.
    Gatenholm, Paul
    Chalmers University of Technology, Sweden.
    Materials from trees assembled by 3D printing – Wood tissue beyond nature limits2019Inngår i: Applied Materials Today, ISSN 2352-9407, Vol. 15, s. 280-285Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Materials from trees have the potential to replace fossil based and other non-sustainable materials in everyday products, thus transforming the society back to a bioeconomy. This paper presents a 3D printing platform which mimics wood biogenesis for the assembly of wood biopolymers into wood-like hierarchical composites. The genome was substituted with G-code, the programming language which controls how the 3D printer assembles material. The rosette was replaced by the printer head for extrusion of cellulose. Instead of microtubules guiding the alignment of cellulose, the printing direction was guided by an x/y stage, thus mimicking the microfibril angle. The printed structures were locked by an enzymatic crosslinking reaction similar to what occurs in the cell wall upon lignification. Hierarchical structures characteristic for wood were designed and printed with control of density, swelling and directional strength. Accelerating the development of the 3D printing technology helps realize the circular bioeconomy where garments, packaging, furniture and entire houses are manufactured by 3D printing wood.

  • 14.
    Mitraka, Evangelia
    et al.
    Linköping University, Sweden.
    Vagin, Mikhail
    Linköping University, Sweden.
    Sjöstedt, Anna
    RISE - Research Institutes of Sweden, Bioekonomi, Papperstillverkning och förpackningar.
    Berggren, Magnus
    Linköping University, Sweden.
    Håkansson, Karl
    RISE - Research Institutes of Sweden, Bioekonomi, Bioraffinaderi och energi.
    Jonsson, Magnus
    Linköping University, Sweden.
    Crispin, Xavier
    PEDOT-Cellulose Gas Diffusion Electrodes for Disposable Fuel Cells2019Inngår i: Advanced Sustainable Systems, ISSN 2366-7486, Vol. 3, nr 12, artikkel-id 1900097Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The mass implementation of renewable energy sources is limited by the lack of energy storage solutions operating on various timescales. Electrochemical technologies such as supercapacitors and batteries cannot handle long storage time because of self-discharge issues. The combination of fuel storage technology and fuel cells is an attractive solution for long storage times. In that context, large-scale fuel cell solutions are required for massive energy storage in cities, which leads to possible concepts such as low-cost disposable fully organic membrane assemblies in fuel cells to avoid regeneration of expensive poisoned electrodes. Here, the formation of an organic gas diffusion electrode (GDE) fabricated by paper-making production, combined with in situ polymerization is demonstrated for the first time. Cellulose is used as a 3D scaffold functionalized with poly(3,4-ethylenedioxythiophene) (PEDOT) serving as both an electrical conductor and an electrocatalyst of high efficiency for the oxygen reduction reaction. The PEDOT-cellulose porous GDE is implemented in a membrane assembly and demonstrated in a H2-O2 fuel cell. The demonstration of low-cost material/manufacturing that is environmentally friendly is a paradigm shift in the development of fuel cells for a sustainable society.

  • 15.
    Mittal, Nitesh
    et al.
    KTH Royal Institute of Technology, Sweden.
    Jansson, Ronnie
    KTH Royal Institute of Technology, Sweden.
    Widhe, Mona
    KTH Royal Institute of Technology, Sweden.
    Benselfelt, Tobias
    KTH Royal Institute of Technology, Sweden.
    Håkansson, Karl
    RISE - Research Institutes of Sweden, Bioekonomi. KTH Royal Institute of Technology, Sweden.
    Lundell, Fredrik
    KTH Royal Institute of Technology, Sweden.
    Hedhammar, My
    KTH Royal Institute of Technology, Sweden.
    Söderberg, L.Daniel
    KTH Royal Institute of Technology, Sweden.
    Ultrastrong and Bioactive Nanostructured Bio-Based Composites2017Inngår i: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086X, Vol. 11, nr 5, s. 5148-5159Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Nature’s design of functional materials relies on smart combinations of simple components to achieve desired properties. Silk and cellulose are two clever examples from nature-spider silk being tough due to high extensibility, whereas cellulose possesses unparalleled strength and stiffness among natural materials. Unfortunately, silk proteins cannot be obtained in large quantities from spiders, and recombinant production processes are so far rather expensive. We have therefore combined small amounts of functionalized recombinant spider silk proteins with the most abundant structural component on Earth (cellulose nanofibrils (CNFs)) to fabricate isotropic as well as anisotropic hierarchical structures. Our approach for the fabrication of bio-based anisotropic fibers results in previously unreached but highly desirable mechanical performance with a stiffness of ∌55 GPa, strength at break of ∌1015 MPa, and toughness of ∌55 MJ m-3. We also show that addition of small amounts of silk fusion proteins to CNF results in materials with advanced biofunctionalities, which cannot be anticipated for the wood-based CNF alone. These findings suggest that bio-based materials provide abundant opportunities to design composites with high strength and functionalities and bring down our dependence on fossil-based resources.

  • 16.
    Mulla, Yusuf
    et al.
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Isacsson, Patrik
    Linköping University, Sweden; Ahlstrom Group Innovation, France.
    Dobryden, Illia
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign. Linköping University, Sweden; Ahlstrom Group Innovation, Sweden.
    Beni, Valerio
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Östmark, Emma
    Stora Enso AB, Sweden.
    Håkansson, Karl
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Edberg, Jesper
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Bio-Graphene Sensors for Monitoring Moisture Levels in Wood and Ambient Environment2023Inngår i: Global Challenges, E-ISSN 2056-6646, Vol. 7, nr 4Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Wood is an inherently hygroscopic material which tends to absorb moisture from its surrounding. Moisture in wood is a determining factor for the quality of wood being employed in construction, since it causes weakening, deformation, rotting, and ultimately leading to failure of the structures resulting in costs to the economy, the environment, and to the safety of residents. Therefore, monitoring moisture in wood during the construction phase and after construction is vital for the future of smart and sustainable buildings. Employing bio-based materials for the construction of electronics is one way to mitigate the environmental impact of such electronics. Herein, a bio-graphene sensor for monitoring the moisture inside and around wooden surfaces is fabricated using laser-induced graphitization of a lignin-based ink precursor. The bio-graphene sensors are used to measure humidity in the range of 10% up to 90% at 25 °C. Using laser induced graphitization, conductor resistivity of 18.6 Ω sq−1 is obtained for spruce wood and 57.1 Ω sq−1 for pine wood. The sensitivity of sensors fabricated on spruce and pine wood is 2.6 and 0.74 MΩ per % RH. Surface morphology and degree of graphitization are investigated using scanning electron microscopy, Raman spectroscopy, and thermogravimetric analysis methods. © 2023 The Authors. 

  • 17.
    Nechyporchuk, Oleksandr
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Håkansson, Karl
    RISE - Research Institutes of Sweden (2017-2019), Bioekonomi, Bioraffinaderi och energi.
    Gowda.V, Krishne
    KTH Royal Institute of Technology, Sweden.
    Lundell, Fredrik
    KTH Royal Institute of Technology, Sweden.
    Hagström, Bengt
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Köhnke, Tobias
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Continuous Assembly of Cellulose Nanofibrils and Nanocrystals into Strong Macrofibers through Microfluidic Spinning2018Inngår i: Advanced Materials Technologies, E-ISSN 2365-709X, artikkel-id 1800557Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Microfluidic fiber spinning is a promising technique for assembling cellulose nanomaterials into macroscopic fibers. However, its implementation requires upscalabe fabrication processes while maintaining high strength of the fibers, which could not be previously achieved. Herein, a continuous wet spinning process based on microfluidic flow focusing is developed to produce strong fibers from cellulose nanofibrils (CNFs) and nanocrystals (CNCs). Fibers with an average breaking tenacity as high as 29.5 cN tex−1 and Young's modulus of 1146 cN tex−1 are reported for the first time, produced from nonhighly purified CNF grades. Using the same developed method, wet spinning of fibers from CNCs is achieved for the first time, reaching an average Young's modulus of 1263 cN tex−1 and a breaking tenacity of 10.6 cN tex−1, thus exhibiting strength twice as high as that of common CNC films. A rather similar stiffness of CNC and CNF spun fibers may originate from similar degrees of alignment, as confirmed by wide-angle X-ray scattering (WAXS) and birefringence measurements, whereas lower strength may primarily arise from the shorter length of CNCs compared to that of CNFs. The benefit of CNCs is their higher solids content in the dopes. By combining both CNCs and CNFs, the fiber properties can be tuned.

  • 18.
    Sandberg, Mats
    et al.
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Håkansson, Karl
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Granberg, Hjalmar
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Paper machine manufactured photocatalysts: Lateral variations2020Inngår i: Journal of Environmental Chemical Engineering, E-ISSN 2213-3437, Vol. 8, artikkel-id 104075Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Paper machine manufacturing of photocatalysts can enable low cost devices for removal of low concentratedpollutants. Lateral variations originating from the paper making process leads to variations of the catalyticactivity over the paper area. Paper machine manufactured papers made from tetrapodal ZnO whiskers and kraftpulp were investigated in this test geometry using simulated solar light. Photocatalytic ZnO papers were laminatedbetween polyethylene sheets and an indicator solution seeped into the laminated photocatalytic paper, tocreate a test geometry where the indicator ink is confined to a small volume between the polyethylene sheets.The photocatalyst papers exhibited surprisingly similar photocatalytic behavior although having different catalystloading 15, 30 and 45 wt percent. All papers exhibited lateral variations that peaked during the conversion.The results show that production of effective photocatalytic composite papers can be scaled.Further, the results show that variations must be considered for photocatalytic papers.

    Fulltekst (pdf)
    fulltext
  • 19.
    Wang, Xin
    et al.
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Grimoldi, Andrea
    Linköping University, Sweden.
    Håkansson, Karl
    RISE - Research Institutes of Sweden (2017-2019), Bioekonomi, Bioraffinaderi och energi.
    Fall, Andreas
    RISE - Research Institutes of Sweden (2017-2019), Bioekonomi, Bioraffinaderi och energi.
    Granberg, Hjalmar
    RISE - Research Institutes of Sweden (2017-2019), Bioekonomi, Papperstillverkning och förpackningar.
    Mengistie, Desalegn
    Linköping University, Sweden.
    Edberg, Jesper
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Engquist, Isak
    Linköping University, Sweden.
    Nilsson, David
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Berggren, Magnus
    Linköping University, Sweden.
    Gustafsson, Göran
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Anisotropic conductivity of Cellulose-PEDOT:PSS composite materials studied with a generic 3D four-point probe tool2019Inngår i: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 66, s. 258-264Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The conductive polymer poly(3,4-ethylenedioxythiphene):poly(styrenesulfonate) (PEDOT:PSS) is widely used in organic electronics and printed electronics due to its excellent electronic and ionic conductivity. PEDOT:PSS films exhibit anisotropic conductivities originating from the interplay of film deposition processes and chemical structure. The previous studies found that high boiling point solvent treated PEDOT:PSS exhibits an anisotropy of 3–4 orders magnitude. Even though both the in-plane and out-of-plane conductivities are important for the device performance, the out-of-plane conductivity is rarely studied due to the complexity with the experiment procedure. Cellulose-based paper or films can also exhibit anisotropic behavior due to the combination of their intrinsic fibric structure and film formation process. We have previously developed a conductive paper based on PEDOT:PSS and cellulose which could be used as the electrodes in energy storage devices. In this work we developed a novel measurement set-up for studying the anisotropy of the charge transport in such composite materials. A tool with two parallel plates mounted with spring loaded probes was constructed enabling probing both lateral and vertical directions and resistances from in-plane and out-of-plane directions to be obtained. The measurement results were then input and analyzed with a model based on a transformation method developed by Montgomery, and thus the in-plane and out-of-plane conductivities could be detangled and derived. We also investigated how the conductivity anisotropy depends on the microstructure of the cellulose template onto which the conductive polymer self-organizes. We show that there is a relatively small difference between the in-plane and out-of-plane conductivities which is attributed to the unique 3D-structure of the composites. This new knowledge gives a better understanding of the possibilities and limitations for using the material in electronic and electrochemical devices.

1 - 19 of 19
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
v. 2.43.0