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  • 1.
    Françon, Hugo
    et al.
    KTH Royal Institute of Technology, Sweden.
    Wang, Zhen
    KTH Royal Institute of Technology, Sweden.
    Marais, Andrew
    KTH Royal Institute of Technology, Sweden.
    Mystek, Katarzyna
    KTH Royal Institute of Technology, Sweden.
    Piper, Andrew
    KTH Royal Institute of Technology, Sweden.
    Granberg, Hjalmar
    RISE Research Institutes of Sweden, Bioeconomy and Health, Pulp, Paper and Packaging.
    Malti, Abdellah
    KTH Royal Institute of Technology, Sweden.
    Gatenholm, Paul
    Chalmers University of Technology, Sweden.
    Larsson, Per
    KTH Royal Institute of Technology, Sweden.
    Wågberg, Lars
    KTH Royal Institute of Technology, Sweden.
    Ambient-Dried, 3D-Printable and Electrically Conducting Cellulose Nanofiber Aerogels by Inclusion of Functional Polymers2020In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, article id 1909383Article in journal (Refereed)
    Abstract [en]

    This study presents a novel, green, and efficient way of preparing crosslinked aerogels from cellulose nanofibers (CNFs) and alginate using non-covalent chemistry. This new process can ultimately facilitate the fast, continuous, and large-scale production of porous, light-weight materials as it does not require freeze-drying, supercritical CO2 drying, or any environmentally harmful crosslinking chemistries. The reported preparation procedure relies solely on the successive freezing, solvent-exchange, and ambient drying of composite CNF-alginate gels. The presented findings suggest that a highly-porous structure can be preserved throughout the process by simply controlling the ionic strength of the gel. Aerogels with tunable densities (23–38 kg m−3) and compressive moduli (97–275 kPa) can be prepared by using different CNF concentrations. These low-density networks have a unique combination of formability (using molding or 3D-printing) and wet-stability (when ion exchanged to calcium ions). To demonstrate their use in advanced wet applications, the printed aerogels are functionalized with very high loadings of conducting poly(3,4-ethylenedioxythiophene):tosylate (PEDOT:TOS) polymer by using a novel in situ polymerization approach. In-depth material characterization reveals that these aerogels have the potential to be used in not only energy storage applications (specific capacitance of 78 F g−1), but also as mechanical-strain and humidity sensors. © 2020 The Authors. 

  • 2.
    Méhes, Gabor
    et al.
    Linköping University, Sweden.
    Vagin, Mikhail
    Linköping University, Sweden.
    Mulla, Mohammad
    Linköping University, Sweden.
    Granberg, Hjalmar
    RISE Research Institutes of Sweden, Bioeconomy and Health, Pulp, Paper and Packaging.
    Che, Canyan
    Linköping University, Sweden.
    Beni, Valerio
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Crispin, Xavier
    Linköping University, Sweden.
    Berggren, Magnus
    Linköping University, Sweden.
    Stavrinidou, Eleni
    Linköping University, Sweden.
    Simon, Daniel
    Linköping University, Sweden.
    Solar Heat-Enhanced Energy Conversion in Devices Based on Photosynthetic Membranes and PEDOT:PSS-Nanocellulose Electrodes2020In: Advanced Sustainable Systems, ISSN 2366-7486, Vol. 4, no 1, article id 1900100Article in journal (Refereed)
    Abstract [en]

    Energy harvesting from photosynthetic membranes, proteins, or bacteria through bio-photovoltaic or bio-electrochemical approaches has been proposed as a new route to clean energy. A major shortcoming of these and solar cell technologies is the underutilization of solar irradiation wavelengths in the IR region, especially those in the far IR region. Here, a biohybrid energy-harvesting device is demonstrated that exploits IR radiation, via convection and thermoelectric effects, to improve the resulting energy conversion performance. A composite of nanocellulose and the conducting polymer system poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) is used as the anode in biohybrid cells that includes thylakoid membranes (TMs) and redox mediators (RMs) in solution. By irradiating the conducting polymer electrode by an IR light-emitting diode, a sixfold enhancement in the harvested bio-photovoltaic power is achieved, without compromising stability of operation. Investigation of the output currents reveals that IR irradiation generates convective heat transfer in the electrolyte bulk, which enhances the redox reactions of RMs at the anode by suppressing diffusion limitations. In addition, a fast-transient thermoelectric component, originating from the PEDOT:PSS-nanocellulose-electrolyte interphase, further increases the bio-photocurrent. These results pave the way for the development of energy-harvesting biohybrids that make use of heat, via IR absorption, to enhance energy conversion efficiency. 

  • 3.
    Zhou, Linghua
    et al.
    SLU Swedish University of Agricultural Sciences, Sweden.
    Chen, Zhiqiang
    SLU Swedish University of Agricultural Sciences, Sweden.
    Olsson, Lars
    RISE Research Institutes of Sweden, Bioeconomy and Health.
    Grahn, Thomas
    RISE Research Institutes of Sweden, Bioeconomy and Health, Pulp, Paper and Packaging.
    Karlsson, Bo
    Skogforsk, Sweden.
    Wu, Harry Xiaming
    SLU Swedish University of Agricultural Sciences, Sweden; Beijing Forestry University, China; CSIRO, Australia.
    Lundqvist, Sven Olof
    RISE Research Institutes of Sweden, Bioeconomy and Health. IIC, Sweden.
    García-Gil, María Rosario
    SLU Swedish University of Agricultural Sciences, Sweden.
    Effect of number of annual rings and tree ages on genomic predictive ability for solid wood properties of Norway spruce2020In: BMC Genomics, ISSN 1471-2164, E-ISSN 1471-2164, Vol. 21, no 1, article id 323Article in journal (Refereed)
    Abstract [en]

    Background: Genomic selection (GS) or genomic prediction is considered as a promising approach to accelerate tree breeding and increase genetic gain by shortening breeding cycle, but the efforts to develop routines for operational breeding are so far limited. We investigated the predictive ability (PA) of GS based on 484 progeny trees from 62 half-sib families in Norway spruce (Picea abies (L.) Karst.) for wood density, modulus of elasticity (MOE) and microfibril angle (MFA) measured with SilviScan, as well as for measurements on standing trees by Pilodyn and Hitman instruments. Results: GS predictive abilities were comparable with those based on pedigree-based prediction. Marker-based PAs were generally 25-30% higher for traits density, MFA and MOE measured with SilviScan than for their respective standing tree-based method which measured with Pilodyn and Hitman. Prediction accuracy (PC) of the standing tree-based methods were similar or even higher than increment core-based method. 78-95% of the maximal PAs of density, MFA and MOE obtained from coring to the pith at high age were reached by using data possible to obtain by drilling 3-5 rings towards the pith at tree age 10-12. Conclusions: This study indicates standing tree-based measurements is a cost-effective alternative method for GS. PA of GS methods were comparable with those pedigree-based prediction. The highest PAs were reached with at least 80-90% of the dataset used as training set. Selection for trait density could be conducted at an earlier age than for MFA and MOE. Operational breeding can also be optimized by training the model at an earlier age or using 3 to 5 outermost rings at tree age 10 to 12 years, thereby shortening the cycle and reducing the impact on the tree.

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