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Berglund, L. & Burgert, I. (2018). Bioinspired Wood Nanotechnology for Functional Materials. Advanced Materials, 30(19), Article ID 1704285.
Open this publication in new window or tab >>Bioinspired Wood Nanotechnology for Functional Materials
2018 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 30, no 19, article id 1704285Article in journal (Refereed) Published
Abstract [en]

It is a challenging task to realize the vision of hierarchically structured nanomaterials for large-scale applications. Herein, the biomaterial wood as a large-scale biotemplate for functionalization at multiple scales is discussed, to provide an increased property range to this renewable and CO2-storing bioresource, which is available at low cost and in large quantities. The Progress Report reviews the emerging field of functional wood materials in view of the specific features of the structural template and novel nanotechnological approaches for the development of wood-polymer composites and wood-mineral hybrids for advanced property profiles and new functions.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH, 2018
Keywords
bioinspiration, functional materials, nanotechnology, structural hierarchy, wood
National Category
Polymer Chemistry Composite Science and Engineering
Identifiers
urn:nbn:se:kth:diva-228261 (URN)10.1002/adma.201704285 (DOI)000431616700004 ()29468736 (PubMedID)2-s2.0-85042279348 (Scopus ID)
Note

QC 20180523

Available from: 2018-05-23 Created: 2018-05-23 Last updated: 2018-05-23Bibliographically approved
Lo Re, G., Spinella, S., Boujemaoui, A., Vilaseca, F., Larsson, P. T., Adås, F. & Berglund, L. (2018). Poly(ε-caprolactone) Biocomposites Based on Acetylated Cellulose Fibers and Wet Compounding for Improved Mechanical Performance. ACS Sustainable Chemistry & Engineering, 5(6), 6753-6760
Open this publication in new window or tab >>Poly(ε-caprolactone) Biocomposites Based on Acetylated Cellulose Fibers and Wet Compounding for Improved Mechanical Performance
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2018 (English)In: ACS Sustainable Chemistry & Engineering, ISSN 2168-0485, Vol. 5, no 6, p. 6753-6760Article in journal, Editorial material (Refereed) Published
Abstract [en]

Poly(epsilon-caprolactone) (PCL) is a ductile thermoplastic, which is biodegradable in the marine environment. Limitations include low strength, petroleum-based origin, and comparably high cost. Cellulose fiber reinforcement is therefore of interest although uniform fiber dispersion is a challenge. In this study, a one-step wet compounding is proposed to validate a sustainable and feasible method to improve the dispersion of the cellulose fibers in hydrophobic polymer matrix as PCL, which showed to be insensitive to the presence of the water during the processing. A comparison between unmodified and acetylated cellulosic wood fibers is made to further assess the net effect of the wet feeding and chemical modification on the biocomposites properties, and the influence of acetylation on fiber structure is reported (ATR-FTIR, XRD). Effects of processing on nano fibrillation, shortening, and dispersion of the cellulose fibers are assessed as well as on PCL molar mass. Mechanical testing, dynamic mechanical thermal analysis, FE-SEM, and X-ray tomography is used to characterize composites. With the addition of 20 wt % cellulosic fibers, the Young's modulus increased from 240 MPa (neat PCL) to 1850 MPa for the biocomposites produced by using the wet feeding strategy, compared to 690 MPa showed for the biocomposites produced using dry feeling. A wet feeding of acetylated cellulosic fibers allowed even a greater increase, with an additional 46% and 248% increase of the ultimate strength and Young's modulus, when compared to wet feeding of the unmodified pulp, respectively.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
National Category
Polymer Technologies
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-225425 (URN)10.1021/acssuschemeng.8b00551 (DOI)000431927500117 ()2-s2.0-85046751578 (Scopus ID)
Note

QC 20180531

Available from: 2018-04-04 Created: 2018-04-04 Last updated: 2018-06-04Bibliographically approved
Herrera, M., Thitiwutthisakul, K., Yang, X., Rujitanaroj, P.-o., Rojas, R. & Berglund, L. (2018). Preparation and evaluation of high-lignin content cellulose nanofibrils from eucalyptus pulp. Cellulose (London), 25(5), 3121-3133
Open this publication in new window or tab >>Preparation and evaluation of high-lignin content cellulose nanofibrils from eucalyptus pulp
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2018 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 25, no 5, p. 3121-3133Article in journal (Refereed) Published
Abstract [en]

High Klason lignin content (23 wt%) cellulose nanofibrils (LCNF) were successfully isolated from eucalyptus pulp through catalyzed chemical oxidation, followed by high-pressure homogenization. LCNFs had a diameter of ca. 13 nm according to AFM evaluation. Dense films were obtained through vacuum filtration (nanopaper) and subjected to different drying methods. When drying under heat and mild vacuum (93 degrees C, 95 kPa) a higher water contact angle, lower roughness and oxygen transmission rate were observed, compared to those drying at room temperature under compression conditions. DSC experiments showed difference in signals associated to T-g of LCNF compared to CNF produced from spruce bleached pulp through enzymatic pre-treatment. The LCNF-based nanopaper showed mechanical properties slightly lower than for those made from cellulose nanofibrils, yet with increased hydrophobicity. In summary, the high-lignin content cellulose nanofibrils proved to be a suitable material for the production of low oxygen permeability nanopaper, with chemical composition close to native wood.

Place, publisher, year, edition, pages
SPRINGER, 2018
Keywords
Lignocellulose nanofibrils, Oxygen barrier, Eucalyptus
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-228268 (URN)10.1007/s10570-018-1764-9 (DOI)000431788000028 ()2-s2.0-85045090612 (Scopus ID)
Note

QC 20180522

Available from: 2018-05-22 Created: 2018-05-22 Last updated: 2018-05-22Bibliographically approved
Li, Y., Fu, Q., Yang, X. & Berglund, L. (2018). Transparent wood for functional and structural applications. Philosophical Transactions. Series A: Mathematical, physical, and engineering science, 376(2112), Article ID 20170182.
Open this publication in new window or tab >>Transparent wood for functional and structural applications
2018 (English)In: Philosophical Transactions. Series A: Mathematical, physical, and engineering science, ISSN 1364-503X, E-ISSN 1471-2962, Vol. 376, no 2112, article id 20170182Article, review/survey (Refereed) Published
Abstract [en]

Optically transparent wood combines mechanical performance with optical functionalities is an emerging candidate for applications in smart buildings and structural optics and photonics. The present review summarizes transparent wood preparation methods, optical and mechanical performance, and functionalization routes, and discusses potential applications. The various challenges are discussed for the purpose of improved performance, scaled-up production and realization of advanced applications. This article is part of a discussion meeting issue 'New horizons for cellulose nanotechnology'.

Place, publisher, year, edition, pages
Royal Society, 2018
Keywords
transparent wood, optical performance, mechanical performance, functionalization and application
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:kth:diva-220989 (URN)10.1098/rsta.2017.0182 (DOI)000418591400013 ()2-s2.0-85040088506 (Scopus ID)
Note

QC 20180111

Available from: 2018-01-11 Created: 2018-01-11 Last updated: 2018-01-11Bibliographically approved
Lang, A. W., Li, Y., De Keersmaecker, M., Shen, D. E., Österholm, A., Berglund, L. & Reynolds, J. R. (2018). Transparent Wood Smart Windows: Polymer Electrochromic Devices Based on Poly(3,4-Ethylenedioxythiophene):Poly(Styrene Sulfonate) Electrodes. ChemSusChem, 11(5), 854-863
Open this publication in new window or tab >>Transparent Wood Smart Windows: Polymer Electrochromic Devices Based on Poly(3,4-Ethylenedioxythiophene):Poly(Styrene Sulfonate) Electrodes
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2018 (English)In: ChemSusChem, ISSN 1864-5631, E-ISSN 1864-564X, Vol. 11, no 5, p. 854-863Article in journal (Refereed) Published
Abstract [en]

Transparent wood composites, with their high strength and toughness, thermal insulation, and excellent transmissivity, offer a route to replace glass for diffusely transmitting windows. Here, conjugated-polymer-based electrochromic devices (ECDs) that switch on-demand are demonstrated using transparent wood coated with poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) as a transparent conducting electrode. These ECDs exhibit a vibrant magenta-to-clear color change that results from a remarkably colorless bleached state. Furthermore, they require low energy and power inputs of 3 mWh m−2 at 2 W m−2 to switch due to a high coloration efficiency (590 cm2 C−1) and low driving voltage (0.8 V). Each device component is processed with high-throughput methods, which highlights the opportunity to apply this approach to fabricate mechanically robust, energy-efficient smart windows on a large scale. 

Place, publisher, year, edition, pages
Wiley-VCH Verlag, 2018
Keywords
electrochemistry, electrochromism, polymers, thin films, wood, Conducting polymers, Conjugated polymers, Electrochromic devices, Electrodes, Styrene, Thermal insulation, Coloration efficiencies, High strength and toughness, High-throughput method, Low driving voltage, Mechanically robust, Poly(styrene sulfonate), Poly-3, 4-ethylenedioxythiophene, Transparent conducting electrodes, Energy efficiency
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-227395 (URN)10.1002/cssc.201702026 (DOI)000427005900006 ()2-s2.0-85041209261 (Scopus ID)
Note

Export Date: 9 May 2018; Article; CODEN: CHEMI; Correspondence Address: Berglund, L.; Department of Fiber and Polymer Technology, Wallenberg Wood Science Center, School of Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, Teknikringen 56–58, Sweden; email: blund@kth.se; Funding details: Georgia Tech, Georgia Institute of Technology; Funding details: 742733, ERC, European Research Council; Funding details: BASF; Funding details: Nanotechnology Initiative; Funding text: Financial support of this work is from the Renewable Bioproducts Institute at the Georgia Institute of Technology. The authors thank BASF for the synthesis of the electrochromic polymers used in this study. L.B. acknowledges funding from the European Research Council Advanced Grant No. 742733, Wood NanoTech. QC 20180530

Available from: 2018-05-30 Created: 2018-05-30 Last updated: 2018-05-30Bibliographically approved
Gioia, C., Lo Re, G., Lawoko, M. & Berglund, L. (2018). Tunable thermosetting epoxies based on fractionated and well-characterized lignins. Journal of the American Chemical Society
Open this publication in new window or tab >>Tunable thermosetting epoxies based on fractionated and well-characterized lignins
2018 (English)In: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126Article in journal, Editorial material (Refereed) Published
Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-225423 (URN)10.1021/jacs.7b13620 (DOI)000428356000035 ()2-s2.0-85044202575 (Scopus ID)
Note

QC 20180525

Available from: 2018-04-04 Created: 2018-04-04 Last updated: 2018-05-30Bibliographically approved
Yang, X. & Berglund, L. (2018). Water-Based Approach to High-Strength All-Cellulose Material with Optical Transparency. ACS SUSTAINABLE CHEMISTRY & ENGINEERING, 6(1), 501-510
Open this publication in new window or tab >>Water-Based Approach to High-Strength All-Cellulose Material with Optical Transparency
2018 (English)In: ACS SUSTAINABLE CHEMISTRY & ENGINEERING, ISSN 2168-0485, Vol. 6, no 1, p. 501-510Article in journal (Refereed) Published
Abstract [en]

All-cellulose composites are usually prepared by a partial cellulose dissolution approach, using of ionic liquids or organic solvents. Here, an all-cellulose film based on moist ramie fibers was prepared by hot-pressing. The original ramie fiber was degummed, alkali treated, aligned, and mounted into a specially designed mold. The wet ramie fiber "cake" was pressed into a transparent film. The structure, mechanical properties, moisture sorption, and optical properties of the films were investigated using scanning electron microscopy (SEM), X-ray diffraction, tensile tests, gravimetric method, and integrating sphere devices. The all-cellulose films showed an ultimate strength of 620 MPa and a Young's modulus of 39.7 GPa with low moisture sorption and optical transmittance of 85%. These eco-friendly all-cellulose films are of interest for laminated composites, as coatings and in photonics applications.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2018
Keywords
Ramie, All-cellulose composite, Compression molding, Mechanical strength, Interface, High transparency, Low moisture sorption
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-221958 (URN)10.1021/acssuschemeng.7b02755 (DOI)000419536800053 ()2-s2.0-85040046287 (Scopus ID)
Note

QC 20180130

Available from: 2018-01-30 Created: 2018-01-30 Last updated: 2018-03-13Bibliographically approved
Mao, R., Goutianos, S., Tu, W., Meng, N., Yang, G., Berglund, L. A. & Peijs, T. (2017). Comparison of fracture properties of cellulose nanopaper, printing paper and buckypaper. Journal of Materials Science, 52(16), 9508-9519
Open this publication in new window or tab >>Comparison of fracture properties of cellulose nanopaper, printing paper and buckypaper
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2017 (English)In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 52, no 16, p. 9508-9519Article in journal (Refereed) Published
Abstract [en]

Cellulose nanopaper consists of a dense fibrous self-binding network composed of cellulose nanofibres connected by physical entanglements, hydrogen bonding, etc. Compared with conventional printing paper, cellulose nanopaper has higher strength and modulus because of stronger fibres and inter-fibre bonding. The aim of this paper is to investigate the fracture properties of cellulose nanopaper using double edge notch tensile tests on samples with different notch lengths. It was found that strength is insensitive to notch length. A cohesive zone model was used to describe the fracture behaviour of notched cellulose nanopaper. Fracture energy was extracted from the cohesive zone model and divided into an energy component consumed by damage in the material and a component related to pull-out or bridging of nanofibres between crack surfaces which was not facilitated due to the limited fibre lengths for the case of nanopapers. For comparison, printing paper which has longer fibres than nanopaper was tested and modelled to demonstrate the importance of fibre length. Buckypaper, a fibrous network made of carbon nanotubes connected through van der Waals forces and physical entanglements, was also investigated to elaborate on the influence of inter-fibre connections.

Place, publisher, year, edition, pages
Springer, 2017
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-210453 (URN)10.1007/s10853-017-1108-4 (DOI)000402560600024 ()2-s2.0-85018282634 (Scopus ID)
Note

QC 20170706

Available from: 2017-07-06 Created: 2017-07-06 Last updated: 2017-07-06Bibliographically approved
Ansari, F., Granda, L. A., Joffe, R., Berglund, L. & Vilaseca, F. (2017). Experimental evaluation of anisotropy in injection molded polypropylene/wood fiber biocomposites. Composites. Part A, Applied science and manufacturing, 96, 147-154
Open this publication in new window or tab >>Experimental evaluation of anisotropy in injection molded polypropylene/wood fiber biocomposites
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2017 (English)In: Composites. Part A, Applied science and manufacturing, ISSN 1359-835X, E-ISSN 1878-5840, Vol. 96, p. 147-154Article in journal (Refereed) Published
Abstract [en]

Although the anisotropy of wood fibers is reasonably well established, the anisotropy of injection molded wood fiber composites is not well understood. This work focuses on chemo-thermomechanical pulp (CTMP) reinforced polypropylene (PP) composites. A kinetic mixer (Gelimat) is used for compounding CTMP/PP composites, followed by injection molding. Effects from processing induced orientation on mechanical properties are investigated. For this purpose, a film gate mold was designed to inject composites in the shape of plates so that specimens in different directions to the flow could be evaluated. Observations from tensile tests were complemented by performing flexural tests (in different directions) on discs cut from the injected plates. SEM was used to qualitatively observe the fiber orientation in the composites. At high fiber content, both modulus and tensile strength could differ by as much as 40% along the flow and transverse to the flow. The fiber orientation was strongly increased at the highest fiber content, as concluded from theoretical analysis.

Place, publisher, year, edition, pages
Elsevier, 2017
Keywords
A. Wood, C. Anisotropy, CTMP orientation, E. Injection molding, Melt processing, Anisotropy, Fibers, Molding, Polypropylenes, Reinforced plastics, Tensile strength, Tensile testing, Thermomechanical pulp, Wood, Wood products, Bio-composites, E. Injection moldings, Experimental evaluation, Fiber contents, Flexural tests, Induced orientation, Wood-fiber composites, Injection molding
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-207326 (URN)10.1016/j.compositesa.2017.02.003 (DOI)000399850600016 ()2-s2.0-85014372994 (Scopus ID)
Note

QC 20170607

Available from: 2017-06-07 Created: 2017-06-07 Last updated: 2017-11-10Bibliographically approved
Vasileva, E., Li, Y., Sychugov, I., Mensi, M., Berglund, L. & Popov, S. (2017). Lasing from Organic Dye Molecules Embedded in Transparent Wood. Advanced Optical Materials, 5(10), Article ID 1700057.
Open this publication in new window or tab >>Lasing from Organic Dye Molecules Embedded in Transparent Wood
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2017 (English)In: Advanced Optical Materials, ISSN 2162-7568, E-ISSN 2195-1071, Vol. 5, no 10, article id 1700057Article in journal (Refereed) Published
Abstract [en]

The report on a study of laser emission from a conceptually new organic material based on transparent wood (TW) with embedded dye Rhodamine 6G molecules is presented in this paper. The lasing performance is compared to a reference organic material containing dye in a poly-methyl-methacrylate matrix. From experimental results, one can conclude that the optical feedback in dye-TW material is realized within cellulose fibers, which play the role of tiny optical resonators. Therefore, the output emission is a collective contribution of individual resonators. Due to this fact, as well as low Q-factor of the resonators/fibers and their length variation, the spectral line of laser emission is broadened up to several nanometers.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH, 2017
Keywords
dye lasers, fluorescent and luminescent materials, laser materials, organic materials, polymer active devices
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-210934 (URN)10.1002/adom.201700057 (DOI)000403848500007 ()2-s2.0-85016716877 (Scopus ID)
Note

QC 20170714

Available from: 2017-07-14 Created: 2017-07-14 Last updated: 2017-07-14Bibliographically approved
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