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Jungstedt, Erik
Publications (4 of 4) Show all publications
Roig-Sanchez, S., Jungstedt, E., Anton-Sales, I., Malaspina, D. C., Faraudo, J., Berglund, L., . . . Roig, A. (2019). Nanocellulose films with multiple functional nanoparticles in confined spatial distribution. NANOSCALE HORIZONS, 4(3), 634-641
Open this publication in new window or tab >>Nanocellulose films with multiple functional nanoparticles in confined spatial distribution
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2019 (English)In: NANOSCALE HORIZONS, ISSN 2055-6756, Vol. 4, no 3, p. 634-641Article in journal (Refereed) Published
Abstract [en]

Industries, governments and consumers increasingly request sustainable resources and greener routes for the integration of advanced functional nanocomposites in products and devices. Among renewable biopolymers, cellulose deserves special consideration since it is the most abundant one. While inorganic nanoparticles add functional properties to a nanocomposite, a flexible and porous cellulosic support will facilitate the interaction of the nanoparticles with the surroundings, their handling and recycling. A significant challenge is to develop high strength, flexible nanobiocomposites controlling the nanoparticle properties, their volume fraction and their topographic distribution within the scaffold. A new concept is presented here for multifunctional laminates where layers consist of bacterial cellulose fibrils decorated by inorganic nanoparticles. Each layer can provide a specific function using a different nanoparticle. As model systems, we have selected two metals (Au, Ag) and two semiconductors (TiO2 and Fe2O3). Energy-efficient microwave-assisted synthetic routes have been used to in situ nucleate and grow the inorganic nanocrystals on the cellulose fibrils. Then, functionalized bacterial cellulose films can be arranged as laminates in a millefeuille construct simply by layering and drying the wet films at 60 degrees C. After drying, they perform as a single integrated and thicker film. Structural, functional and mechanical integrity of the laminates have been investigated. Molecular dynamics simulations were used to compute the surface adhesion energy between two cellulose fibrils and the results are discussed in light of the experimental peel-off data for the separation of the layers in the laminate.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY, 2019
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-255226 (URN)10.1039/c8nh00310f (DOI)000471816500005 ()2-s2.0-85062920523 (Scopus ID)
Note

QC 20190903

Available from: 2019-09-03 Created: 2019-09-03 Last updated: 2019-09-03Bibliographically approved
Li, Y., Cheng, M., Jungstedt, E., Xu, B., Sun, L. & Berglund, L. (2019). Optically Transparent Wood Substrate for Perovskite Solar Cells. ACS Sustainable Chemistry and Engineering, 7(6), 6061-6067
Open this publication in new window or tab >>Optically Transparent Wood Substrate for Perovskite Solar Cells
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2019 (English)In: ACS Sustainable Chemistry and Engineering, ISSN 2168-0485, Vol. 7, no 6, p. 6061-6067Article in journal (Refereed) Published
Abstract [en]

Transparent wood is a candidate for use as an energy-saving building material due to its low density (ca. 1.2 g/cm(3)), high optical transmittance (over 85% at 1 mm thickness), low thermal conductivity (0.23 W m(-1) K-1), and good load-bearing performance with tough failure behavior (no shattering). High optical transmittance also makes transparent wood a candidate for optoelectronic devices. In this work, for the first time, perovskite solar cells processed at low temperature (<150 degrees C) were successfully assembled directly on transparent wood substrates. A power conversion efficiency up to 16.8% was obtained. The technologies demonstrated may pave the way for integration of solar cells with light transmitting wood building structures for energy-saving purposes.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019
Keywords
Biocomposite, Perovskite solar cell, Energy-Efficient, Building material, Transparent wood, Mechanical properties
National Category
Composite Science and Engineering
Identifiers
urn:nbn:se:kth:diva-248333 (URN)10.1021/acssuschemeng.8b06248 (DOI)000461978200051 ()30918764 (PubMedID)2-s2.0-85063061391 (Scopus ID)
Note

QC 20190410

Available from: 2019-04-10 Created: 2019-04-10 Last updated: 2019-04-10Bibliographically approved
Panzer, M. B., Giudice, J. S., Caudillo, A., Mukherjee, S., Kong, K., Cronin, D. S., . . . Brown, P. (2018). NUMERICAL CROWDSOURCING OF NFL FOOTBALL HELMETS. Paper presented at 3rd Joint Symposium of the International-and-National-Neurotrauma-Societies-and-AANS/CNS-Section on Neurotrauma and Critical Care, AUG 11-16, 2018, Toronto, CANADA. Journal of Neurotrauma, 35(16), A148-A148
Open this publication in new window or tab >>NUMERICAL CROWDSOURCING OF NFL FOOTBALL HELMETS
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2018 (English)In: Journal of Neurotrauma, ISSN 0897-7151, E-ISSN 1557-9042, Vol. 35, no 16, p. A148-A148Article in journal, Meeting abstract (Other academic) Published
Place, publisher, year, edition, pages
Mary Ann Liebert, 2018
Keywords
Biomechanics, Computational / Modeling, Concussion / mTBI
National Category
Anesthesiology and Intensive Care
Identifiers
urn:nbn:se:kth:diva-234624 (URN)000441527400400 ()
Conference
3rd Joint Symposium of the International-and-National-Neurotrauma-Societies-and-AANS/CNS-Section on Neurotrauma and Critical Care, AUG 11-16, 2018, Toronto, CANADA
Note

QC 20180913

Available from: 2018-09-13 Created: 2018-09-13 Last updated: 2019-08-20Bibliographically approved
Fu, Q., Yan, M., Jungstedt, E., Yang, X., Li, Y. & Berglund, L. A. (2018). Transparent plywood as a load-bearing and luminescent biocomposite. Composites Science And Technology, 164, 296-303
Open this publication in new window or tab >>Transparent plywood as a load-bearing and luminescent biocomposite
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2018 (English)In: Composites Science And Technology, ISSN 0266-3538, E-ISSN 1879-1050, Vol. 164, p. 296-303Article in journal (Refereed) Published
Abstract [en]

Transparent wood (TW) structures in research studies were either thin and highly anisotropic or thick and isotropic but weak. Here, transparent plywood (TPW) laminates are investigated as load-bearing biocomposites with tunable mechanical and optical performances. Structure-property relationships are analyzed. The plies of TPW were laminated with controlled fiber directions and predetermined stacking sequence in order to control the directional dependence of modulus and strength, which would give improved properties in the weakest direction. Also, the angular dependent light scattering intensities were investigated and showed more uniform distribution. Luminescent TPW was prepared by incorporation of quantum dots (QDs) for potential lighting applications. TPW can be designed for large-scale use where multiaxial load-bearing performance is combined with new optical functionalities.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Transparent Wood, Nanotechnology, Biocomposite, Photonics
National Category
Composite Science and Engineering
Identifiers
urn:nbn:se:kth:diva-233274 (URN)10.1016/j.compscitech.2018.06.001 (DOI)000440121700036 ()2-s2.0-85048381154 (Scopus ID)
Funder
EU, European Research Council, 742733
Note

QC 20180821

Available from: 2018-08-21 Created: 2018-08-21 Last updated: 2018-08-21Bibliographically approved
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