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Publications (10 of 14) Show all publications
Mulla, Y., Isacsson, P., Dobryden, I., Beni, V., Östmark, E., Håkansson, K. & Edberg, J. (2023). Bio-Graphene Sensors for Monitoring Moisture Levels in Wood and Ambient Environment. Global Challenges
Open this publication in new window or tab >>Bio-Graphene Sensors for Monitoring Moisture Levels in Wood and Ambient Environment
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2023 (English)In: Global Challenges, E-ISSN 2056-6646Article in journal (Refereed) Epub ahead of print
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. 

Place, publisher, year, edition, pages
John Wiley and Sons Inc, 2023
Keywords
cellulose, humidity sensors, laser-induced graphene, lignin, moisture sensors, wood
National Category
Wood Science
Identifiers
urn:nbn:se:ri:diva-64231 (URN)10.1002/gch2.202200235 (DOI)2-s2.0-85148603362 (Scopus ID)
Note

Article; Export Date: 15 March 2023; Correspondence Address: J. Edberg, RISE Research Institutes of Sweden, Sweden;

 The authors would like to acknowledge funding from Vinnova for the Digital Cellulose Competence Center (DCC), Diary number 2016–05193, as well as financial support from Stora Enso AB. The work was also supported by Treesearch.se. Dr. Robert Brooke is thankfully acknowledged for taking the picture and video for Figure 7 and Video S1 , Supporting Information respectively.

Available from: 2023-03-20 Created: 2023-03-20 Last updated: 2023-12-22Bibliographically approved
Östlund, Å., de la Motte, H., Östmark, E., Wedin, H. & Sandin, G. (2018). Chemical Recycling of Textile Fibres (2ed.). In: Annie Gullingsrud (Ed.), Sustainable Fibre Toolkit 2018: (pp. 169-171). Stockholm: Stiftelsen Svensk Textilforskning
Open this publication in new window or tab >>Chemical Recycling of Textile Fibres
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2018 (English)In: Sustainable Fibre Toolkit 2018 / [ed] Annie Gullingsrud, Stockholm: Stiftelsen Svensk Textilforskning , 2018, 2, p. 169-171Chapter in book (Other academic)
Place, publisher, year, edition, pages
Stockholm: Stiftelsen Svensk Textilforskning, 2018 Edition: 2
Keywords
Textile fibres, sustainable fashion, fibre recycling, textile recycling, chemical recycling, Textilfibrer, hållbart mode, fiberåtervinning, textilåtervinning, kemisk återvinning
National Category
Engineering and Technology
Identifiers
urn:nbn:se:ri:diva-33902 (URN)
Available from: 2018-05-30 Created: 2018-05-30 Last updated: 2023-05-17Bibliographically approved
Olsson, S., Matsunaga, H., Kataoka, Y., Johansson, M., Matsumura, J., Westin, M. & Östmark, E. (2015). A SEM study on the use of epoxy functional vegetable oil and reactive UV-absorber as UV-protecting pretreatment for wood (ed.). Polymer degradation and stability, 113, 40-45
Open this publication in new window or tab >>A SEM study on the use of epoxy functional vegetable oil and reactive UV-absorber as UV-protecting pretreatment for wood
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2015 (English)In: Polymer degradation and stability, ISSN 0141-3910, E-ISSN 1873-2321, Vol. 113, p. 40-45Article in journal (Refereed) Published
Abstract [en]

The present study investigates the ageing performance of a UV protective system for wood, comprising the reactive UV absorber 2-hydroxy-4(2,3-epoxypropoxy)-benzophenone (HEPBP) and epoxy functional vegetable oils (linseed and soybean oil). Scots pine samples of radial or cross-sectional surfaces were treated using a combination of the two components, or using only one of the oils. The treated samples were then aged in a Weather-Ometer for 2 × 60 h and analysed using VPSEM to follow the degradation of the wood substrate in the exact same spot before, during and after ageing. The results of the radial surfaces show slightly less degradation of samples treated with a combination of HEPBP and oil, and for the cross-sectional surfaces an even stronger protective effect is visible. For samples treated with only one of the two oils, no improvement was detectable. The radial surfaces were also analysed using FTIR where the results indicate presence of the protective treatment even after 120 h of exposure. Overall the combined pretreatment of HEPBP and epoxy functional linseed oil was concluded to have a photostabilising effect of the wood substrate.

Keywords
UV-absorber, Epoxy functional vegetable oil, Linseed oil, 2-Hydroxy-4(2, 3-epoxypropoxy)-benzophenone (HEPBP)
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-6804 (URN)10.1016/j.polymdegradstab.2015.01.005 (DOI)2-s2.0-84922584471 (Scopus ID)23592 (Local ID)23592 (Archive number)23592 (OAI)
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2020-12-01Bibliographically approved
Östmark, E., Aspling, J. & Henriksson, M. (2014). EcoBuild Activity Report 2013 (ed.).
Open this publication in new window or tab >>EcoBuild Activity Report 2013
2014 (English)Report (Refereed)
Publisher
p. 12
Series
SP Rapport, ISSN 0284-5172 ; 2014:29
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-5187 (URN)16420 (Local ID)16420 (Archive number)16420 (OAI)
Available from: 2016-09-07 Created: 2016-09-07 Last updated: 2023-05-25Bibliographically approved
Olsson, S., Johansson, M., Westin, M. & Östmark, E. (2014). Reactive UV-absorber and epoxy functionalized soybean oil for enhanced UV-protection of clear coated wood (ed.). Polymer degradation and stability, 110, 405–414
Open this publication in new window or tab >>Reactive UV-absorber and epoxy functionalized soybean oil for enhanced UV-protection of clear coated wood
2014 (English)In: Polymer degradation and stability, ISSN 0141-3910, E-ISSN 1873-2321, Vol. 110, p. 405–414-Article in journal (Refereed) Published
Abstract [en]

The present work investigates the photostabilising effect of a pretreatment consisting of 2-hydroxy-4(2,3-epoxypropoxy)-benzophenone (HEPBP) and epoxy functionalized soybean oil (ESBO), reacted on to Scots pine veneers coated with two different acrylic top coats. Two different pretreatment procedures were used, varying in reaction time and temperature. Results from FTIR and SEC analysis indicate that a large amount of reactant was present on the veneers after treatment with either of the two reaction procedures. Furthermore, coating of the pretreated surfaces was possible and the pretreatment does not seem to affect the adhesion between the coating and the wood substrate. Both accelerated ageing and natural exposure was used to study the resistance to photodegradation, and the results were analysed using colour measurements, FTIR and SEM. These analyses all show that 1400 h of accelerated ageing degrades neither the wood nor the coating to any larger extent. However, after 4000 h of UV exposure some signs of degradation are visible but to a lesser extent for pretreated samples. For the samples exposed to natural weathering during 14 months the performance was good in terms of photostabilisation, however all samples suffer from mould to different extents. Pretreated samples show smaller and more evenly distributed areas of mould compared to the references, which show slightly more mould. The combined coating/pretreatment system is thus assumed to have an effect in terms of photostabilization of the coated wood.

National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-6662 (URN)10.1016/j.polymdegradstab.2014.09.017 (DOI)2-s2.0-84949117531 (Scopus ID)20360 (Local ID)20360 (Archive number)20360 (OAI)
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2020-12-01Bibliographically approved
Östlund, Å., Östmark, E. & Jones, D. (2014). Scientific Programme and Book of Abstracts: Workshop Science and uses of nanocellulose & Cellulose foams and films. March 5-6, 2014 (ed.).
Open this publication in new window or tab >>Scientific Programme and Book of Abstracts: Workshop Science and uses of nanocellulose & Cellulose foams and films. March 5-6, 2014
2014 (English)Report (Refereed)
Publisher
p. 58
Series
SP Rapport, ISSN 0284-5172 ; 2014:
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-5169 (URN)16253 (Local ID)978-91-87461-58-3 (ISBN)16253 (Archive number)16253 (OAI)
Note

Full text http://www.costfp1205.com/en/events/Documents/Abstracts%20COST%20Action%20meeting%205-6th%20of%20March%202014_0228.pdf

Available from: 2016-09-07 Created: 2016-09-07 Last updated: 2020-12-01Bibliographically approved
Olsson, S., Johansson, M. K. .., Westin, M. & Östmark, E. (2012). Grafting of 2-hydroxy-4(2,3-epoxypropoxy)-benzophenone and epoxidized soybean oil to wood: Reaction conditions and effects on the color stability of Scots pine (ed.). Polymer degradation and stability, 97(9), 1779-1786
Open this publication in new window or tab >>Grafting of 2-hydroxy-4(2,3-epoxypropoxy)-benzophenone and epoxidized soybean oil to wood: Reaction conditions and effects on the color stability of Scots pine
2012 (English)In: Polymer degradation and stability, ISSN 0141-3910, E-ISSN 1873-2321, Vol. 97, no 9, p. 1779-1786Article in journal (Refereed) Published
Abstract [en]

This study investigates the photostabilizing effect of the reactive UV-absorber 2-hydroxy-4(2,3-epoxypropoxy)-benzophenone (HEPBP) when used as a primer for wood. The present work further includes a study on the effect of HEPBP used in combination with an epoxy functionalized vegetable oil as a primer system. The study is based on reactions performed on pine veneers using 3-pentanone as a solvent and 4-(dimethylamino)pyridine (DMAP) as a catalyst, varying the reaction time and temperature. Results from FTIR and SEC measurements indicate that a desired reaction between HEPBP and wood does occur and that there are synergetic effects when HEPBP and oil are combined. Color measurements also indicate that the use of HEPBP and epoxidized soybean oil as pretreatment for wood results in a lower color change after 400 h of artificial weathering. We conclude that using HEPBP in combination with epoxy functionalized soybean oil does improve photostability of wood exposed to artificial weathering.

Keywords
2-Hydroxy-4(2, 3-epoxypropoxy)-benzophenone (HEPBP), Epoxy functionalized soybean oil, Grafting, UV-protection, Wood
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-6367 (URN)10.1016/j.polymdegradstab.2012.06.006 (DOI)2-s2.0-84864606912 (Scopus ID)14567 (Local ID)14567 (Archive number)14567 (OAI)
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2021-01-12Bibliographically approved
Olsson, S., Johansson, M., Westin, M. & Östmark, E. (2012). Utilising reactive UV absorber and epoxidised soybean oil for enhanced UV protection of clear coated wood (ed.). In: The Sixth European Conference on Wood Modification Proceedings: . Paper presented at The Sixth European Conference on Wood Modification. University of Ljubljana
Open this publication in new window or tab >>Utilising reactive UV absorber and epoxidised soybean oil for enhanced UV protection of clear coated wood
2012 (English)In: The Sixth European Conference on Wood Modification Proceedings, University of Ljubljana , 2012, , p. 455-462Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
University of Ljubljana, 2012. p. 455-462
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-12220 (URN)14517 (Local ID)14517 (Archive number)14517 (OAI)
Conference
The Sixth European Conference on Wood Modification
Available from: 2016-09-13 Created: 2016-09-13 Last updated: 2020-12-01Bibliographically approved
Olsson, S., Westin, M., Johansson, M., Evans, P. & Östmark, E. (2011). Improving UV-protection of exterior wood by utilizing UV-absorber in combination with epoxy functionalized soybean oil (ed.). In: Proceedings of the 2011 IAWS Annual Meeting on Novel Materials from Wood or Cellulose: . Paper presented at 2011 IAWS Annual Meeting on Novel Materials from Wood or Cellulose. Innventia
Open this publication in new window or tab >>Improving UV-protection of exterior wood by utilizing UV-absorber in combination with epoxy functionalized soybean oil
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2011 (English)In: Proceedings of the 2011 IAWS Annual Meeting on Novel Materials from Wood or Cellulose, Innventia , 2011, , p. 63-64Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Innventia, 2011. p. 63-64
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-12097 (URN)13078 (Local ID)13078 (Archive number)13078 (OAI)
Conference
2011 IAWS Annual Meeting on Novel Materials from Wood or Cellulose
Available from: 2016-09-13 Created: 2016-09-13 Last updated: 2020-12-01Bibliographically approved
Olsson, S., Östmark, E., Ibach, R., Clemons, C. M., Segerholm, K. & Englund, F. (2011). The use of esterified lignin for synthesis of durable composites (ed.). In: 7th meeting of the Nordic-Baltic Network in Wood Material Science & Engineering (WSE): . Paper presented at 7th meeting of the Nordic-Baltic Network in Wood Material Science & Engineering (WSE). Norsk institutt for skog og landskap
Open this publication in new window or tab >>The use of esterified lignin for synthesis of durable composites
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2011 (English)In: 7th meeting of the Nordic-Baltic Network in Wood Material Science & Engineering (WSE), Norsk institutt for skog og landskap , 2011, , p. 173-178Conference paper, Published paper (Other academic)
Abstract [en]

Lignin is a natural polymer and one of the most abundant materials on earth. Despite this fact, lignin is often viewed as a by-product in chemical pulp processing and the use of lignin as a sustainable material is low. However, research and public awareness of sustainability have opened up new possibilities for using lignin as a material. In this study, Kraft softwood lignin was reacted with acetic and propionic anhydride to synthesize esterified lignin. Reactions were performed at 80 °C. The product was analyzed using IR, DSC and processability parameters, such as melt viscosity. The product was then blended with LDPE and extruded into composite films. The films were analyzed using FTIR and TGA, and the mechanical properties were determined by tensile tests. Preliminary results are positive and further studies are planned to confirm the results and establish the range of properties attainable.

Place, publisher, year, edition, pages
Norsk institutt for skog og landskap, 2011. p. 173-178
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-12053 (URN)12824 (Local ID)12824 (Archive number)12824 (OAI)
Conference
7th meeting of the Nordic-Baltic Network in Wood Material Science & Engineering (WSE)
Note

Link to the proceedings http://www.skogoglandskap.no/filearchive/rapport_15_11_proceedings_7th_meeting_nordic_baltic_network_in_wood_material_science_engineering.pdf

Available from: 2016-09-13 Created: 2016-09-13 Last updated: 2020-12-01Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-6244-4200

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