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Pettersson, TorbjörnORCID iD iconorcid.org/0000-0002-5444-7276
Alternative names
Publications (10 of 90) Show all publications
Chen, C., Pettersson, T., Illergård, J., Ek, M. & Wågberg, L. (2019). Influence of Cellulose Charge on Bacteria Adhesion and Viability to PVAm/CNF/PVAm-Modified Cellulose Model Surfaces. Biomacromolecules
Open this publication in new window or tab >>Influence of Cellulose Charge on Bacteria Adhesion and Viability to PVAm/CNF/PVAm-Modified Cellulose Model Surfaces
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2019 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602Article in journal (Refereed) Published
Abstract [en]

A contact-active antibacterial approach based on the physical adsorption of a cationic polyelectrolyte onto the surface of a cellulose material is today regarded as an environment-friendly way of creating antibacterial surfaces and materials. In this approach, the electrostatic charge of the treated surfaces is considered to be an important factor for the level of bacteria adsorption and deactivation/killing of the bacteria. In order to clarify the influence of surface charge density of the cellulose on bacteria adsorption as well as on their viability, bacteria were adsorbed onto cellulose model surfaces, which were modified by physically adsorbed cationic polyelectrolytes to create surfaces with different positive charge densities. The surface charge was altered by the layer-by-layer (LbL) assembly of cationic polyvinylamine (PVAm)/anionic cellulose nanofibril/PVAm onto the initially differently charged cellulose model surfaces. After exposing the LbL-treated surfaces to Escherichia coli in aqueous media, a positive correlation was found between the adsorption of bacteria as well as the ratio of nonviable/viable bacteria and the surface charge of the LbL-modified cellulose. By careful colloidal probe atomic force microscopy measurements, it was estimated, due to the difference in surface charges, that interaction forces at least 50 nN between the treated surfaces and a bacterium could be achieved for the surfaces with the highest surface charge, and it is suggested that these considerable interaction forces are sufficient to disrupt the bacterial cell wall and hence kill the bacteria.

National Category
Biochemistry and Molecular Biology
Research subject
Fibre and Polymer Science
Identifiers
urn:nbn:se:kth:diva-249635 (URN)10.1021/acs.biomac.9b00297 (DOI)000468120800025 ()2-s2.0-85065660991 (Scopus ID)
Note

QC 20190611

Available from: 2019-04-15 Created: 2019-04-15 Last updated: 2019-06-11Bibliographically approved
Träger, A., Klein, G., Carrick, C., Pettersson, T., Johansson, M., Wågberg, L., . . . Carlmark, A. (2019). Macroscopic cellulose probes for the measurement of polymer grafted surfaces. Cellulose (London), 26(3), 1467-1477
Open this publication in new window or tab >>Macroscopic cellulose probes for the measurement of polymer grafted surfaces
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2019 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 26, no 3, p. 1467-1477Article in journal (Refereed) Published
Abstract [en]

A synthesis protocol was identified to produce covalent grafting of poly(dimethyl siloxane) from cellulose, based on prior studies of analogous ring opening polymerizations. Following this polymer modification of cellulose, the contact adhesion was anticipated to be modified and varied as a function of the polymer molecular mass. The synthetic details were optimized for a filter paper surface before grafting the polymer from bulk cellulose spheres. The adhesion of the unmodified and grafted, bulk cellulose spheres were evaluated using the Johnson-Kendall-Roberts (JKR) theory with a custom build contact adhesion testing setup. We report the first example of grafting poly(dimethyl siloxane) directly from bulk cellulose using ring opening polymerization. For short grafting lengths, both the JKR work of adhesion and the adhesion energy at the critical energy release rate (G(c)) were comparable to unmodified cellulose beads. When polymer grafting lengths were extended sufficiently where chain entanglements occur, both the JKR work of adhesion and G(c) were increased by as much as 190%. Given the multitude of options available to graft polymers from cellulose, this study shows the potential to use this type of cellulose spheres to study the interaction between different polymer surfaces in a controlled manner. [GRAPHICS] .

Place, publisher, year, edition, pages
SPRINGER, 2019
Keywords
Grafted polymer, Cellulose, Contact mechanics, Adhesion, Johnson-Kendall-Roberts theory
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-247840 (URN)10.1007/s10570-018-2196-2 (DOI)000460617900004 ()
Note

QC 20190326

Available from: 2019-03-26 Created: 2019-03-26 Last updated: 2019-05-20Bibliographically approved
Colson, J., Pettersson, T., Asaadi, S., Sixta, H., Nypelo, T., Mautner, A. & Konnerth, J. (2018). Adhesion properties of regenerated lignocellulosic fibres towards poly (lactic acid) microspheres assessed by colloidal probe technique. Journal of Colloid and Interface Science, 532, 819-829
Open this publication in new window or tab >>Adhesion properties of regenerated lignocellulosic fibres towards poly (lactic acid) microspheres assessed by colloidal probe technique
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2018 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 532, p. 819-829Article in journal (Refereed) Published
Abstract [en]

In the field of polymer reinforcement, it is important to understand the interactions involved between the polymer matrix and the reinforcing component. This paper is a contribution to the fundamental understanding of the adhesion mechanisms involved in natural fibre reinforced composites. We report on the use of the colloidal probe technique for the assessment of the adhesion behaviour between poly(lactic acid) microspheres and embedded cross-sections of regenerated lignocellulosic fibres. These fibres consisted of tailored mixtures of cellulose, lignin and xylan, the amount of which was determined beforehand. The influence of the chemical composition of the fibres on the adhesion behaviour was studied in ambient air and in dry atmosphere. In ambient air, capillary forces resulted in larger adhesion between the sphere and the fibres. Changing the ambient medium to a dry nitrogen atmosphere allowed reducing the capillary forces, leading to a drop in the adhesion forces. Differences between fibres of distinct chemical compositions could be measured only on freshly cut surfaces. Moreover, the surface energy of the fibres was assessed by inverse gas chromatography. Compared to fibres containing solely cellulose, the presence of lignin and/or hemicellulose led to higher adhesion and lower surface energy, suggesting that these chemicals could serve as natural coupling agents between hydrophobic and hydrophilic components.

Place, publisher, year, edition, pages
Academic Press, 2018
Keywords
Colloidal probe, Interface, Lignin, Cellulose, Hemicellulose, Polymers, Microspheres, Inverse gas chromatography
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-235858 (URN)10.1016/j.jcis.2018.08.032 (DOI)000445322600086 ()30145523 (PubMedID)2-s2.0-85051991209 (Scopus ID)
Note

QC 20181009

Available from: 2018-10-09 Created: 2018-10-09 Last updated: 2018-12-10Bibliographically approved
Karlsson, R.-M. P., Larsson, P. T., Yu, S., Pendergraph, S. A., Pettersson, T., Hellwig, J. & Wågberg, L. (2018). Carbohydrate gel beads as model probes for quantifying non-ionic and ionic contributions behind the swelling of delignified plant fibers. Journal of Colloid and Interface Science, 519, 119-129
Open this publication in new window or tab >>Carbohydrate gel beads as model probes for quantifying non-ionic and ionic contributions behind the swelling of delignified plant fibers
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2018 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 519, p. 119-129Article in journal (Refereed) Published
Abstract [en]

Macroscopic beads of water-based gels consisting of uncharged and partially charged beta-(1,4)-D-glucan polymers were developed to be used as a novel model material for studying the water induced swelling of the delignified plant fiber walls. The gel beads were prepared by drop-wise precipitation of solutions of dissolving grade fibers carboxymethylated to different degrees. The internal structure was analyzed using Solid State Cross-Polarization Magic Angle Spinning Carbon-13 Nuclear Magnetic Resonance and Small Angle X-ray Scattering showing that the internal structure could be considered a homogeneous, non-crystalline and molecularly dispersed polymer network. When beads with different charge densities were equilibrated with aqueous solutions of different ionic strengths and/or pH, the change in water uptake followed the trends expected for weak polyelectrolyte gels and the trends found for cellulose-rich fibers. When dried and subsequently immersed in water the beads also showed an irreversible loss of swelling depending on the charge and type of counter-ion which is commonly also found for cellulose-rich fibers. Taken all these results together it is clear that the model cellulose-based beads constitute an excellent tool for studying the fundamentals of swelling of cellulose rich plant fibers, aiding in the elucidation of the different molecular and supramolecular contributions to the swelling.

Place, publisher, year, edition, pages
Academic Press, 2018
Keywords
Swelling, Water uptake, Hydrogel, Cellulose, Small-angle X-ray scattering, Solid state NMR, Atomic force microscopy
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-226733 (URN)10.1016/j.jcis.2018.02.052 (DOI)000429633500013 ()29486431 (PubMedID)2-s2.0-85042413398 (Scopus ID)
Funder
Knut and Alice Wallenberg Foundation
Note

QC 20180503

Available from: 2018-05-03 Created: 2018-05-03 Last updated: 2019-04-25Bibliographically approved
Benyahia Erdal, N., Adolfsson, K. H., Pettersson, T. & Hakkarainen, M. (2018). Green Strategy to Reduced Nanographene Oxide through Microwave Assisted Transformation of Cellulose. ACS Sustainable Chemistry and Engineering, 6(1), 1245-1255
Open this publication in new window or tab >>Green Strategy to Reduced Nanographene Oxide through Microwave Assisted Transformation of Cellulose
2018 (English)In: ACS Sustainable Chemistry and Engineering, ISSN 2168-0485, Vol. 6, no 1, p. 1245-1255Article in journal (Refereed) Published
Abstract [en]

A green strategy for fabrication of biobased reduced nanographene oxide (r-nGO) was developed. Cellulose derived nanographene oxide (nGO) type carbon nanodots were reduced by microwave assisted hydrothermal treatment with superheated water alone or in the presence of caffeic acid (CA), a green reducing agent. The carbon nanodots, r-nGO and r-nGO-CA, obtained through the two different reaction routes without or with the added reducing agent, were characterized by multiple analytical techniques including FTIR, XPS, Raman, XRD, TGA, TEM, AFM, UV-vis, and DLS to confirm and evaluate the efficiency of the reduction reactions. A significant decrease in oxygen content accompanied by increased number of sp2 hybridized functional groups was confirmed in both cases. The synergistic effect of superheated water and reducing agent resulted in the highest C/O ratio and thermal stability, which also supported a more efficient reduction. Interesting optical properties were detected by fluorescence spectroscopy where nGO, r-nGO, and r-nGO-CA all displayed excitation dependent fluorescence behavior. r-nGO-CA and its precursor nGO were evaluated toward osteoblastic cells MG-63 and exhibited nontoxic behavior up to 200 μg mL-1, which gives promise for utilization in biomedical applications.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
Keywords
Biobased, Biomass, Carbon nanodots, Hydrothermal, Microwave, Reducing agent
National Category
Other Chemical Engineering Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-221151 (URN)10.1021/acssuschemeng.7b03566 (DOI)000419536800131 ()2-s2.0-85040200237 (Scopus ID)
Note

QC 20180115

Available from: 2018-01-15 Created: 2018-01-15 Last updated: 2018-06-25Bibliographically approved
Hellwig, J., López Durán, V. & Pettersson, T. (2018). Measuring elasticity of wet cellulose fibres with AFM using indentation and a linearized Hertz model. Analytical Methods, 10(31)
Open this publication in new window or tab >>Measuring elasticity of wet cellulose fibres with AFM using indentation and a linearized Hertz model
2018 (English)In: Analytical Methods, ISSN 1759-9660, E-ISSN 1759-9679, Vol. 10, no 31Article in journal (Refereed) Published
Abstract [en]

The mechanical properties of different pulp fibres in liquid were measured using an atomic force microscope. Specifically a custom-made sample holder was used to indent the fibre surface, without causing any motion, and the Young's modulus was calculated from the indentation using a linearized Hertz model.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2018
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-234605 (URN)10.1039/c8ay00816g (DOI)000442260600001 ()2-s2.0-85051472152 (Scopus ID)
Funder
VINNOVAWallenberg Foundations
Note

QC 20180914

Available from: 2018-09-14 Created: 2018-09-14 Last updated: 2018-09-14Bibliographically approved
Erlandsson, J., Pettersson, T., Ingverud, T., Granberg, H., Larsson, P. A., Malkoch, M. & Wågberg, L. (2018). On the mechanism behind freezing-induced chemical crosslinking in ice-templated cellulose nanofibril aerogels. Journal of Materials Chemistry A, 6(40), 19371-19380
Open this publication in new window or tab >>On the mechanism behind freezing-induced chemical crosslinking in ice-templated cellulose nanofibril aerogels
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2018 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 6, no 40, p. 19371-19380Article in journal (Refereed) Published
Abstract [en]

The underlying mechanism related to freezing-induced crosslinking of aldehyde-containing cellulose nanofibrils (CNFs) has been investigated, and the critical parameters behind this process have been identified. The aldehydes introduced by periodate oxidation allows for formation of hemiacetal bonds between the CNFs provided the fibrils are in sufficiently close contact before the water is removed. This is achieved during the freezing process where the cellulose components are initially separated, and the growth of ice crystals forces the CNFs to come into contact in the thin lamellae between the ice crystals. The crosslinked 3-D structure of the CNFs can subsequently be dried under ambient conditions after solvent exchange and still maintain a remarkably low density of 35 kg m-3, i.e. a porosity greater than 98%. A lower critical amount of aldehydes, 0.6 mmol g-1, was found necessary in order to generate a crosslinked 3-D CNF structure of sufficient strength not to collapse during the ambient drying. The chemical stability of the 3-D structure can be further enhanced by converting the hemiacetals to acetals by treatment with an alcohol under acidic conditions.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2018
Keywords
Aerogels, Aldehydes, Cellulose, Chemical stability, Crosslinking, Freezing, Nanofibers, Acidic conditions, Ambient conditions, Cellulose nanofibrils (CNFs), Chemical cross-linking, Freezing process, Lower critical, Periodate oxidation, Solvent exchanges, Ice
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-247488 (URN)10.1039/c8ta06319b (DOI)000448413100008 ()2-s2.0-85055128762 (Scopus ID)
Note

QC 20190405

Available from: 2019-04-05 Created: 2019-04-05 Last updated: 2019-05-22Bibliographically approved
Pettersson, T., Erlandsson, J., Larsson, P. & Wågberg, L. (2018). On the mechanism of freeze-induced crosslinking of aerogels made from periodate-oxidised cellulose nanofibrils. Paper presented at 255th National Meeting and Exposition of the American-Chemical-Society (ACS) - Nexus of Food, Energy, and Water, MAR 18-22, 2018, New Orleans, LA. Abstracts of Papers of the American Chemical Society, 255
Open this publication in new window or tab >>On the mechanism of freeze-induced crosslinking of aerogels made from periodate-oxidised cellulose nanofibrils
2018 (English)In: Abstracts of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 255Article in journal, Meeting abstract (Other academic) Published
Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-240167 (URN)000435537703096 ()
Conference
255th National Meeting and Exposition of the American-Chemical-Society (ACS) - Nexus of Food, Energy, and Water, MAR 18-22, 2018, New Orleans, LA
Note

QC 20190111

Available from: 2019-01-11 Created: 2019-01-11 Last updated: 2019-08-20Bibliographically approved
Pettersson, T., Hellwig, J., Gustafsson, P.-J. & Stenstrom, S. (2017). Measurement of the flexibility of wet cellulose fibres using atomic force microscopy. Cellulose (London), 24(10), 4139-4149
Open this publication in new window or tab >>Measurement of the flexibility of wet cellulose fibres using atomic force microscopy
2017 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 24, no 10, p. 4139-4149Article in journal (Refereed) Published
Abstract [en]

Flexibility and modulus of elasticity data for two types of wet cellulose fibres using a direct force-displacement method by means of AFM are reported for never dried wet fibres immersed in water. The flexibilities for the bleached softwood kraft pulp (BSW) fibres are in the range of 4-38 x 10(12) N-1 m(-2) while the flexibilities for the thermomechanical pulp (TMP) fibres are about one order of magnitude lower. For BSW the modulus of elasticity ranges from 1 to 12 MPa and for TMP between 15-190 MPa. These data are lower than most other available pulp fibre data and comparable to a soft rubber band. Reasons for the difference can be that our measurements with a direct method were performed using never dried fibres immersed in water while other groups have employed indirect methods using pulp with different treatments.

Place, publisher, year, edition, pages
SPRINGER, 2017
Keywords
Flexibility, Modulus of elasticity, AFM, Cellulose fibre
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-215440 (URN)10.1007/s10570-017-1407-6 (DOI)000410759600003 ()2-s2.0-85025442559 (Scopus ID)
Note

QC 20171019

Available from: 2017-10-19 Created: 2017-10-19 Last updated: 2017-10-19Bibliographically approved
Hellwig, J., Karlsson, R. M., Wågberg, L. & Pettersson, T. (2017). Measuring elasticity of wet cellulose beads with an AFM colloidal probe using a linearized DMT model. Analytical Methods, 9(27), 4019-4022
Open this publication in new window or tab >>Measuring elasticity of wet cellulose beads with an AFM colloidal probe using a linearized DMT model
2017 (English)In: Analytical Methods, ISSN 1759-9660, E-ISSN 1759-9679, Vol. 9, no 27, p. 4019-4022Article in journal (Refereed) Published
Abstract [en]

The mechanical properties of wet cellulose are investigated using an atomic force microscope AFM and calculated using a linearized DMT model. Measurements were performed using a model system of gel beads made of cellulose with different charge densities, which show a high impact on the mechanical properties of the cellulose in wet state.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2017
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-215478 (URN)10.1039/c7ay01219e (DOI)000411460700001 ()2-s2.0-85023750517 (Scopus ID)
Note

QC 20171013

Available from: 2017-10-13 Created: 2017-10-13 Last updated: 2019-05-22Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-5444-7276

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