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Publications (10 of 20) Show all publications
Andersson Trojer, M., Olsson, C., Bengtsson, J., Hedlund, A. & Bordes, R. (2019). Directed self-assembly of silica nanoparticles in ionic liquid-spun cellulose fibers.. Journal of Colloid and Interface Science, 553, 167-176, Article ID S0021-9797(19)30648-4.
Open this publication in new window or tab >>Directed self-assembly of silica nanoparticles in ionic liquid-spun cellulose fibers.
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2019 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 553, p. 167-176, article id S0021-9797(19)30648-4Article in journal (Refereed) Published
Abstract [en]

The application range of man-made cellulosic fibers is limited by the absence of cost- and manufacturing-efficient strategies for anisotropic hierarchical functionalization. Overcoming these bottlenecks is therefore pivotal in the pursuit of a future bio-based economy. Here, we demonstrate that colloidal silica nanoparticles (NPs), which are cheap, biocompatible and easy to chemically modify, enable the control of the cross-sectional morphology and surface topography of ionic liquid-spun cellulose fibers. These properties are tailored by the silica NPs' surface chemistry and their entry point during the wet-spinning process (dope solution DSiO2 or coagulation bath CSiO2). For CSiO2-modified fibers, the coagulation mitigator dimethylsulphoxide allows for controlling the surface topography and the amalgamation of the silica NPs into the fiber matrix. For dope-modified fibers, we hypothesize that cellulose chains act as seeds for directed silica NP self-assembly. This results for DSiO2 in discrete micron-sized rods, homogeneously distributed throughout the fiber and for glycidoxy-surface modified DSiO2@GLYEO in nano-sized surface aggregates and a cross-sectional core-shell fiber morphology. Furthermore, the dope-modified fibers display outstanding strength and toughness, which are both characteristic features of biological biocomposites.

Keywords
Biocomposites, Mechanical properties, Plasma-enhanced chemical vapor deposition, Surface topography, Wet-spinning
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-39064 (URN)10.1016/j.jcis.2019.05.084 (DOI)31202053 (PubMedID)
Available from: 2019-06-26 Created: 2019-06-26 Last updated: 2019-06-26Bibliographically approved
Bengtsson, A., Bengtsson, J., Olsson, C., Sedin, M., Jedvert, K., Theliander, H. & Sjöholm, E. (2018). Improved yield of carbon fibres from cellulose and kraft lignin. Holzforschung, 72(12), 1007-1016
Open this publication in new window or tab >>Improved yield of carbon fibres from cellulose and kraft lignin
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2018 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 72, no 12, p. 1007-1016Article in journal (Refereed) Published
Abstract [en]

To meet the demand for carbon-fibre-reinforced composites in lightweight applications, cost-efficient processing and new raw materials are sought for. Cellulose and kraft lignin are each interesting renewables for this purpose due to their high availability. The molecular order of cellulose is an excellent property, as is the high carbon content of lignin. By co-processing cellulose and lignin, the advantages of these macromolecules are synergistic for producing carbon fibre (CF) of commercial grade in high yields. CFs were prepared from precursor fibres (PFs) made from 70:30 blends of softwood kraft lignin (SW-KL) and cellulose by dry-jet wet spinning with the ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate ([EMIm][OAc]) as a solvent. In focus was the impact of the molecular mass of lignin and the type of cellulose source on the CF yield and properties, while membrane-filtrated kraft lignin and cellulose from dissolving kraft pulp and fully bleached paper-grade SW-KP (kraft pulp) served as sources. Under the investigated conditions, the yield increased from around 22% for CF from neat cellulose to about 40% in the presence of lignin, irrespective of the type of SW-KL. The yield increment was also higher relative to the theoretical one for CF made from blends (69%) compared to those made from neat celluloses (48-51%). No difference in the mechanical properties of the produced CF was observed.

Keywords
1-ethyl-3-methylimidazolium acetate (EMIMAc), carbon fibre (CF), cellulose, dissolving pulp, dry-jet wet-spun, fractionation, kraft pulp, LignoBoost lignin, molecular mass, softwood kraft lignin, Carbon fibers, Dissolution, Fiber reinforced materials, Fiber reinforced plastics, Ionic liquids, Softwoods, 1-ethyl-3-methylimidazolium acetates, Carbon fibre reinforced composites, Dry jet-wet spinning, High carbon content, Lightweight application, Molecular ordering, Softwood kraft lignins, Lignin
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-34571 (URN)10.1515/hf-2018-0028 (DOI)2-s2.0-85050958001 (Scopus ID)
Available from: 2018-08-13 Created: 2018-08-13 Last updated: 2019-06-18Bibliographically approved
Olsson, C., Sjöholm, E. & Reimann, A. (2017). Carbon fibres from precursors produced by dry-jet wet-spinning of kraft lignin blended with kraft pulps. Holzforschung, 71(4), 275-283
Open this publication in new window or tab >>Carbon fibres from precursors produced by dry-jet wet-spinning of kraft lignin blended with kraft pulps
2017 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 71, no 4, p. 275-283Article in journal (Refereed) Published
Abstract [en]

A part of kraft lignin (KL) can be used as a value-added product without detracting the chemical recovery and the energy balance of the kraft mill. The focus of this study is the production of light-weight carbon fibres (CFS) from KL obtained by the LignoBoost process. For this purpose, crude KL and various cellulose products from kraft pulping of hardwood (HW) and softwood (SW) were dissolved in 1-ethyl-3-methylimidazolium acetate ([EMIm][OAc]) and submitted to dry-jet wet-spun to obtain precursor fibres containing 70% KL and 30% cellulose, which were thermally stabilised and further converted by thermal treatments into CF. The initial and final products were characterised with respect to, e.g. mole mass distribution, thermal properties, tensile strength and tensile modulus determination. The optimised precursor fibres are smooth and flexible with similar mechanical properties as commercial textile fibres. The best CFS made had a tensile strength of 780 MPa and a tensile modulus of 68 GPa and are thus stronger and stiffer than those produced by melt-spinning of SW-based lignins alone. The new CFS based on dry-jet wet-spun precursors still have a high potential for further improvements.

Keywords
carbon fibre (CF), dry-jet wet-spun, ionic liquid (IL); kraft pulp, precursor fibre, softwood kraft lignin (KL), tensile modulus, tensile strength
National Category
Bioprocess Technology
Identifiers
urn:nbn:se:ri:diva-29403 (URN)10.1515/hf-2016-0189 (DOI)2-s2.0-85016745985 (Scopus ID)
Available from: 2017-04-26 Created: 2017-04-26 Last updated: 2019-07-05Bibliographically approved
Bengtsson, J., Olsson, C., Köhnke, T. & Bialik, E. (2017). Elucidating the effect of non-solvents on the TBAAc/DMSO-cellulosesolvent system. In: Cellulosic material properties and industrial potential: Final meeting in COST FP1205. Paper presented at Final meeting in COST FP1205, Cellulosic material Properties and industrial potential, Stockholm, March 7-9.
Open this publication in new window or tab >>Elucidating the effect of non-solvents on the TBAAc/DMSO-cellulosesolvent system
2017 (English)In: Cellulosic material properties and industrial potential: Final meeting in COST FP1205, 2017Conference paper, Oral presentation with published abstract (Other academic)
National Category
Materials Engineering
Identifiers
urn:nbn:se:ri:diva-30160 (URN)
Conference
Final meeting in COST FP1205, Cellulosic material Properties and industrial potential, Stockholm, March 7-9
Available from: 2017-08-01 Created: 2017-08-01 Last updated: 2019-06-27Bibliographically approved
Idström, A., Gentile, L., Gubitosi, M., Olsson, C., Stenqvist, B., Lund, M., . . . Bialik, E. (2017). On the dissolution of cellulose in tetrabutylammonium acetate/dimethyl sulfoxide: a frustrated solvent. Cellulose (London), 24(9), 3645-3657
Open this publication in new window or tab >>On the dissolution of cellulose in tetrabutylammonium acetate/dimethyl sulfoxide: a frustrated solvent
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2017 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 24, no 9, p. 3645-3657Article in journal (Refereed) Published
Abstract [en]

We have found that the dissolution of cellulose in the binary mixed solvent tetrabutylammonium acetate/dimethyl sulfoxide follows a previously overlooked near-stoichiometric relationship such that one dissolved acetate ion is able to dissolve an amount of cellulose corresponding to about one glucose residue. The structure and dynamics of the resulting cellulose solutions were investigated using small-angle X-ray scattering (SAXS) and nuclear magnetic resonance techniques as well as molecular dynamics simulation. This yielded a detailed picture of the dissolution mechanism in which acetate ions form hydrogen bonds to cellulose and causes a diffuse solvation sheath of bulky tetrabutylammonium counterions to form. In turn, this leads to a steric repulsion that helps to keep the cellulose chains apart. Structural similarities to previously investigated cellulose solutions in aqueous tetrabutylammonium hydroxide were revealed by SAXS measurement. To what extent this corresponds to similarities in dissolution mechanism is discussed.

Keywords
Cellulose dissolution, Ionic liquids, Nuclear magnetic resonance, Small angle X-ray scattering, Molecular dynamics simulations
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-30144 (URN)10.1007/s10570-017-1370-2 (DOI)2-s2.0-85021162537 (Scopus ID)
Available from: 2017-07-31 Created: 2017-07-31 Last updated: 2019-06-28Bibliographically approved
Idström, A., Gentile, L., Gubitosi, M., Olsson, C., Stenqvist, B., Lund, M., . . . Wernersson, E. (2017). Tetrabutylammonium acetate as a solvent for cellulose. In: : . Paper presented at COST Action FP1205, Borås, April 13-14..
Open this publication in new window or tab >>Tetrabutylammonium acetate as a solvent for cellulose
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2017 (English)Conference paper, Oral presentation with published abstract (Other academic)
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-30210 (URN)
Conference
COST Action FP1205, Borås, April 13-14.
Available from: 2017-08-04 Created: 2017-08-04 Last updated: 2019-06-28Bibliographically approved
Idström, A., Gentile, L., Gubitosi, M., Olsson, C., Stenqvist, B., Lund, M., . . . Wernersson, E. (2017). Tetrabutylammonium acetate/dimethyl sulfoxide  as a solvent for cellulose. In: : . Paper presented at Proceedings of the 14th European workshop on lignocellulosics and pulp, Autrans, France, June 28-30..
Open this publication in new window or tab >>Tetrabutylammonium acetate/dimethyl sulfoxide  as a solvent for cellulose
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2017 (English)Conference paper, Oral presentation with published abstract (Other academic)
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-30214 (URN)
Conference
Proceedings of the 14th European workshop on lignocellulosics and pulp, Autrans, France, June 28-30.
Available from: 2017-08-04 Created: 2017-08-04 Last updated: 2019-06-28Bibliographically approved
Bengtsson, J., Olsson, C., Hedlund, A., Köhnke, T. & Bialik, E. (2017). Understanding the Inhibiting Effect of Small-Molecule Hydrogen Bond Donors on the Solubility of Cellulose in Tetrabutylammonium Acetate/DMSO. Journal of Physical Chemistry B, 121(50), 11241-11248
Open this publication in new window or tab >>Understanding the Inhibiting Effect of Small-Molecule Hydrogen Bond Donors on the Solubility of Cellulose in Tetrabutylammonium Acetate/DMSO
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2017 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 121, no 50, p. 11241-11248Article in journal (Refereed) Published
Abstract [en]

Certain ionic liquids are powerful cellulose solvents, but tend to be less effective when small-molecule hydrogen bond donors are present. This is generally attributed to competition with cellulose for hydrogen bonding opportunities to the anion of the ionic liquid. We show that the solubility of cellulose in dimethyl sulfoxide solutions of tetrabutylammonium acetate is less strongly affected by water than by ethanol on a molar basis, contrary to what can be expected based on hydrogen bond stoichiometry. Molecular dynamics simulations indicate that the higher tolerance to water is due to water-cellulose interactions that improves solvation of cellulose and, thereby, marginally favors dissolution. Through Kirkwood-Buff theory we show that water, but not ethanol, improves the solvent quality of DMSO and partly compensates for the loss of acetate-cellulose hydrogen bonds.

Keywords
Cellulose, Dimethyl sulfoxide, Ethanol, Ionic liquids, Molecular dynamics, Molecules, Organic solvents, Solubility, Cellulose hydrogen bonds, Cellulose solvent, Hydrogen bond donors, Inhibiting effect, Molecular dynamics simulations, Small molecules, Solvent quality, Tetrabutylammonium acetates, Hydrogen bonds
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-33042 (URN)10.1021/acs.jpcb.7b08501 (DOI)2-s2.0-85037599708 (Scopus ID)
Available from: 2018-01-11 Created: 2018-01-11 Last updated: 2019-06-27Bibliographically approved
Olsson, C., Idström, A., Bengtsson, J. & Köhnke, T. (2016). Coagulation of cellulose solutions and its effect on material properties. In: Proceedings of the 14th European workshop on lignocellulosics and pulp: . Paper presented at 14th European workshop on lignocellulosics and pulp, June 28 - July 1, 2016, Autrans, France.
Open this publication in new window or tab >>Coagulation of cellulose solutions and its effect on material properties
2016 (English)In: Proceedings of the 14th European workshop on lignocellulosics and pulp, 2016Conference paper, Oral presentation with published abstract (Other academic)
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-30226 (URN)
Conference
14th European workshop on lignocellulosics and pulp, June 28 - July 1, 2016, Autrans, France
Available from: 2017-08-07 Created: 2017-08-07 Last updated: 2019-06-18Bibliographically approved
Idström, A., Gentile, L., Gubitosi, M., Olsson, C., Stenqvist, B., Lund, M., . . . Wernersson, E. (2016). Dissolution of cellulose in tetrabutylammonium acetate/dimethyl sulfoxide. In: The 7th Workshop on cellulose, regenerated cellulose and cellulose derivatives: . Paper presented at 7th Workshop on cellulose, regenerated cellulose and cellulose derivatives, November 15-16, 2016, Örnsköldsvik, Sweden (pp. 15-18). , Article ID 1.
Open this publication in new window or tab >>Dissolution of cellulose in tetrabutylammonium acetate/dimethyl sulfoxide
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2016 (English)In: The 7th Workshop on cellulose, regenerated cellulose and cellulose derivatives, 2016, p. 15-18, article id 1Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

The dissolution of cellulose in tetrabutylammonium acetate (TBAAc)/dimethyl sulfoxide (DMSO) was studied combining experimental and simulation techniques. It was found that the dissolution limit at 40 °C corresponded to a molar ratio close to one acetate per cellulose anhydroglucose units. MD simulations suggested that the acetate ions bind to cellulose by dual hydrogen bonds. This effectively turns cellulose into a polyelectrolyte, attracting the bulky tetrabutylammonium (TBA+ ) counter ions, which prevent close contact between chains in the dissolved state. This hypothesis was tested by 1 Hand 13C-NMR spectroscopy, which confirmed that acetate forms hydrogen bonds to cellulose, and by diffusion NMR spectroscopy, which demonstrated a strong dynamic correlation between bound acetate and tetrabutylammonium in near-quantitative agreement with simulation. The present results suggest that offering hydrogen bonding to the acetate ions is the main driving force for dissolving cellulose and that the TBA+ counter ions form a diffuse layer around the acetate-decorated cellulose chains.

National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-30217 (URN)
Conference
7th Workshop on cellulose, regenerated cellulose and cellulose derivatives, November 15-16, 2016, Örnsköldsvik, Sweden
Available from: 2017-08-04 Created: 2017-08-04 Last updated: 2019-06-28Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-5212-780x

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