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Publikationer (10 of 81) Visa alla publikationer
Michel, B., Heggset, E. B., Sillard, C., Syverud, K., Dufresne, A. & Bras, J. (2023). Drug release and antimicrobial property of Cellulose Nanofibril/β-Cyclodextrin/Sulfadiazine films. Cellulose
Öppna denna publikation i ny flik eller fönster >>Drug release and antimicrobial property of Cellulose Nanofibril/β-Cyclodextrin/Sulfadiazine films
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2023 (Engelska)Ingår i: Cellulose, ISSN 0969-0239, E-ISSN 1572-882XArtikel i tidskrift (Refereegranskat) Epub ahead of print
Abstract [en]

Active Principal Ingredient (API) encapsulation through adsorption and physical entrapment onto TEMPO-oxidized cellulose nanofibrils (toCNFs) is possible, but challenges such as burst release and use of low water-soluble API such as sulfadiazine (SD) are yet to be addressed. The objective of this study is to assess the release property and antibacterial activity of toCNF/β-Cyclodextrin (β-CD)/SD materials in the form of films. Release in sink conditions was achieved with result highlighting the importance of the toCNF network structure, which is tightened at acidic pH for toCNFs due to its carboxylic content, reducing the burst effect phenomena. Antibacterial activity against Staphylococcus aureus and Escherichia coli was assessed and the results showed a clear beneficial impact of using β-CDs. An antibacterial effect for toCNF/SD films is confirmed for 3 successive applications whereas an antibacterial effect for a toCNF/CMβCD/SD film is prolonged up to 7 successive applications. The improvement of the topical release of a prophylactic agent with these materials are making them promising for biomedical applications such as wound dressing. Graphic abstract: [Figure not available: see fulltext.] © 2023, The Author(s)

Ort, förlag, år, upplaga, sidor
Springer Science and Business Media B.V., 2023
Nyckelord
Antimicrobial properties, Cellulose nanofibrils, Cyclodextrins, Drug release, Sulfadiazine, Cellulose films, Escherichia coli, Medical applications, Nanocellulose, Nanofibers, Targeted drug delivery, Active principals, Anti-bacterial activity, Anti-microbial properties, Antibacterial effects, Drug release properties, Oxidized cellulose, Physical entrapment, Controlled drug delivery
Nationell ämneskategori
Biomaterialvetenskap
Identifikatorer
urn:nbn:se:ri:diva-64415 (URN)10.1007/s10570-023-05135-6 (DOI)2-s2.0-85150179526 (Scopus ID)
Anmärkning

 Funding details: Norges Teknisk-Naturvitenskapelige Universitet, NTNU; Funding details: Agence Nationale de la Recherche, ANR, ANR-15-IDEX-02; Funding details: Department of Chemical Engineering, Universiti Teknologi Petronas; Funding details: European Regional Development Fund, ERDF; Funding details: Région Auvergne-Rhône-Alpes; Funding text 1: The authors acknowledge the French National Research Agency in the framework of the "Investissements d’avenir” program Glyco@Alps (ANR-15-IDEX-02) and NTNU through its Department of Chemical Engineering for funding this work, and LGP2 and its employees for the help and support given to this project.; Funding text 2: This work is supported by the French National Research Agency in the framework of the "Investissements d’avenir” program Glyco@Alps (ANR-15-IDEX-02) and NTNU through its Department of Chemical Engineering. LGP2 is part of the LabEx Tec 21 (Investissements d’Avenir—Grant Agreement No. ANR-11-LABX-0030) and of the PolyNat Carnot Institute (Investissements d’Avenir—Grant Agreement No. ANR-16-CARN-0025–01).This research was made possible thanks to the facilities of the TekLiCell platform funded by the Région Rhône-Alpes (ERDF: European regional dsevelopment fund).

Tillgänglig från: 2023-05-03 Skapad: 2023-05-03 Senast uppdaterad: 2023-05-25Bibliografiskt granskad
Solberg, A., Zehner, J., Somorowsky, F., Rose, K., Korpela, A. & Syverud, K. (2023). Material properties and water resistance of inorganic–organic polymer coated cellulose paper and nanopaper. Cellulose, 30, 1205-1223
Öppna denna publikation i ny flik eller fönster >>Material properties and water resistance of inorganic–organic polymer coated cellulose paper and nanopaper
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2023 (Engelska)Ingår i: Cellulose, ISSN 0969-0239, E-ISSN 1572-882X, Vol. 30, s. 1205-1223Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Cellulose-based materials represent a renewable, biodegradable, and environmentally friendly alternative to plastic from fossil resources. Nanopaper is a strong and lightweight material formed from cellulose nanofibrils (CNFs). Paper and nanopaper have been considered as excellent alternatives to plastics for use in agriculture and for packaging applications. However, common for both paper and nanopaper is their hydrophilic character, and consequently, poor water-resistance properties. ORMOCER®s are a class of inorganic–organic polymers with excellent barrier and protective properties used for a range of coating applications. Here we present ORMOCER®-coated paper and nanopaper. The coated papers and nanopapers are characterized, both in terms of their morphology, hydrophobicity, and mechanical properties. We demonstrate that the pressure used during the pressing and drying of paper and nanopaper influence their tear and tensile—properties, and that the morphology of the coated nanopaper differs significantly from that of the coated paper. While the ORMOCER® was impregnated within the porous network of the paper, a well-defined two-layered morphology was obtained with the coated nanopaper. Further, the biodegradability of the nanopaper with and without coating was assessed. The degradation study demonstrated that both the pressure used during the pressing and drying of the nanopaper, and the composition of the ORMOCER®, influenced the rate of degradation. Taken together, ORMOCER®-coated paper and nanopaper are promising for the preparation of materials that are both water-resistant, renewable, and biodegradable. © 2022, The Author(s).

Ort, förlag, år, upplaga, sidor
Springer Science and Business Media B.V., 2023
Nyckelord
Cellulose, Hydrophobic coating, Nanopaper, Organic–inorganic polymers, Paper, Tunable biodegradation, Biodegradability, Biodegradable polymers, Hydrophobicity, Morphology, Plastic coatings, Coated paper, Hydrophobic coatings, Inorganic-organic polymers, Organic inorganic polymers, ORMOCER, Pressung, Tunables, Water-resistances, Biodegradation
Nationell ämneskategori
Pappers-, massa- och fiberteknik
Identifikatorer
urn:nbn:se:ri:diva-61430 (URN)10.1007/s10570-022-04925-8 (DOI)2-s2.0-85141690021 (Scopus ID)
Anmärkning

 Funding details: Norges Forskningsråd, 305151; Funding text 1: Open access funding provided by RISE Research Institutes of Sweden. This work was supported by Bioeconomy in the North and the Research Council of Norway (Grant Number 305151). The authors declare no competitive financial interests.

Tillgänglig från: 2022-12-07 Skapad: 2022-12-07 Senast uppdaterad: 2024-03-18Bibliografiskt granskad
Rashad, A., Grøndahl, M., Heggset, E. B., Mustafa, K. & Syverud, K. (2023). Responses of Rat Mesenchymal Stromal Cells to Nanocellulose with Different Functional Groups. ACS Applied Bio Materials, 6(3), 987-998
Öppna denna publikation i ny flik eller fönster >>Responses of Rat Mesenchymal Stromal Cells to Nanocellulose with Different Functional Groups
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2023 (Engelska)Ingår i: ACS Applied Bio Materials, E-ISSN 2576-6422, Vol. 6, nr 3, s. 987-998Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Cellulose nanofibrils (CNFs) are multiscale hydrophilic biocompatible polysaccharide materials derived from wood and plants. TEMPO-mediated oxidation of CNFs (TO-CNF) turns some of the primary hydroxyl groups to carboxylate and aldehyde groups. Unlike carboxylic functional groups, there is little or no information about the biological role of the aldehyde groups on the surface of wood-based CNFs. In this work, we replaced the aldehyde groups in the TO-CNF samples with carboxyl groups by another oxidation treatment (TO-O-CNF) or with primary alcohols with terminal hydroxyl groups by a reduction reaction (TO-R-CNF). Rat mesenchymal stem/stromal cells (MSCs) derived from bone marrow were seeded on polystyrene tissue culture plates (TCP) coated with CNFs with and without aldehyde groups. TCP and TCP coated with bacterial nanocellulose (BNC) were used as control groups. Protein adsorption measurements demonstrated that more proteins were adsorbed from cell culture media on all CNF surfaces compared to BNC. Live/dead and lactate dehydrogenase assays confirmed that all nanocellulose biomaterials supported excellent cell viability. Interestingly, TO-R-CNF samples, which have no aldehyde groups, showed better cell spreading than BNC and comparable results to TCP. Unlike TO-O-CNF surfaces, which have no aldehyde groups either, TO-R-CNF stimulated cells, in osteogenic medium, to have higher alkaline phosphatase activity and to form more biomineralization than TCP and TO-CNF groups. These findings indicate that the presence of aldehyde groups (280 ± 14 μmol/g) on the surface of TEMPO-oxidized CNFs might have little or no effect on attachment, proliferation, and osteogenic differentiation of MSCs. © 2023 The Authors.

Ort, förlag, år, upplaga, sidor
American Chemical Society, 2023
Nyckelord
aldehyde functional group, cell morphology, osteogenic differentiation, protein adsorption, tissue engineering, wood-based cellulose nanofibrils, Aldehydes, Biocompatibility, Biomineralization, Bone, Calcium phosphate, Carboxylation, Cell engineering, Cells, Collagen, Flowcharting, Morphology, Nanocellulose, Nanofibers, Oxidation, Phosphatases, Rats, Tissue culture, Transmission control protocol, Cellulose nanofibrils, Nano-cellulose, TEMPO-mediated oxidation, Tissue culture plates, Tissues engineerings, Wood-based cellulose nanofibril, Wood
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
urn:nbn:se:ri:diva-64143 (URN)10.1021/acsabm.2c00794 (DOI)2-s2.0-85148072873 (Scopus ID)
Anmärkning

 Funding details: Trond Mohn stiftelse, BFS2018TMT10; Funding details: Norges Forskningsråd, 228147, 302043; Funding text 1: This work has been funded by the Research Council of Norway through the projects of NORCEL Project (Grant No. 228147) and 3DPRENT (Grant No. 302043) and by Trond Mohn Foundation (BFS2018TMT10). The authors would like to thank Dr. Shuntaro Yamada for cell isolation and characterization.

Tillgänglig från: 2023-03-07 Skapad: 2023-03-07 Senast uppdaterad: 2023-07-06Bibliografiskt granskad
El Miri, N., Heggset, E. B., Wallsten, S., Svedberg, A., Syverud, K. & Norgren, M. (2022). A comprehensive investigation on modified cellulose nanocrystals and their films properties. International Journal of Biological Macromolecules, 219, 998-1008
Öppna denna publikation i ny flik eller fönster >>A comprehensive investigation on modified cellulose nanocrystals and their films properties
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2022 (Engelska)Ingår i: International Journal of Biological Macromolecules, ISSN 0141-8130, E-ISSN 1879-0003, Vol. 219, s. 998-1008Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In this work, we aimed to tune cellulose nanocrystals (CNCs) properties by introducing different functional groups (aldehyde, carboxyl, silane, and ammonium groups) on the surface through different chemical modifications. These functional groups were obtained by combining: the periodate oxidation with TEMPO-oxidation, aminosylation or cationization. CNCs produced and their films were characterized to elucidate their performances. The results showed that the properties of obtained CNCs varied depending on the grafted functionalities on the surface. The results reveal that after each modification a colloidal stability is preserved. Interestingly, Periodate oxidation of cellulose nanocrystals results in film components that interact through intra- and intermolecular hemiacetals and lead to films with a tensile strength of 116 MPa compared to the pristine CNCs, in contrast the subsequent modifications led to lower tensile strength. Of note, remarkable thermal stability has been achieved after modifications reaching a maximum of 280 °C. The oxygen barrier properties of the films after modifications varied between 0.48 and 0.54 cm3μm/(m2d*kPa) at 50 % RH. 

Ort, förlag, år, upplaga, sidor
Elsevier B.V., 2022
Nyckelord
Cationization, Cellulose nanocrystals, Periodate oxidation, Silylation, Surface modification
Nationell ämneskategori
Biokemi och molekylärbiologi
Identifikatorer
urn:nbn:se:ri:diva-60003 (URN)10.1016/j.ijbiomac.2022.08.057 (DOI)2-s2.0-85135879049 (Scopus ID)
Anmärkning

Funding details: 20201315; Funding details: Svenska Forskningsrådet Formas, 942-2015-251; Funding text 1: The authors gratefully acknowledge the Swedish Research Council FORMAS [Grant No. 942-2015-251 ] and Interreg Sverige-Norge [Grant No. 20201315 ] for the financial support.

Tillgänglig från: 2022-10-07 Skapad: 2022-10-07 Senast uppdaterad: 2023-05-25Bibliografiskt granskad
Rodriguez Fabia, S., Torstensen, J., Johansson, L. & Syverud, K. (2022). Hydrophobisation of lignocellulosic materials part I: physical modification. Cellulose, 29(10), 5375-5393
Öppna denna publikation i ny flik eller fönster >>Hydrophobisation of lignocellulosic materials part I: physical modification
2022 (Engelska)Ingår i: Cellulose, ISSN 0969-0239, E-ISSN 1572-882X, Vol. 29, nr 10, s. 5375-5393Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

This review is the first part of a comprehensive review of hydrophobisation of lignocellulosic materials. The purpose of this review has been to compare physical hydrophobisation methods of lignocellulosic materials. We have compared molecular physical adsorption with plasma etching and grafting. Adsorption methods are facile and rely upon the simple mixing or coating of the substrate with the hydrophobing agent. However, none of the surfactant-based methods reviewed here reach contact angles above 90°, making them unsuitable for applications where a high degree of hydrophobisation is required. Nevertheless, surfactant based methods are well suited for compatibilising the lignocellulosic material with a hydrophobic matrix/polymer in cases where only a slight decrease in the hydrophilicity of the lignocellulosic substrate is required. On the other hand, wax- and lignin-based coatings can provide high hydrophobicity to the substrates. Plasma etching requires a more complex set-up but is relatively cheap. By physically etching the surface with or without the deposition of a hydrophobic coating, the material is rendered hydrophobic, reaching contact angles well above 120°. A major drawback of this method is the need for a plasma etching set-up, and some researchers co-deposit fluorine-based layers, which have a negative environmental impact. An alternative is plasma grafting, where single molecules are grafted on, initiated by radicals formed in the plasma. This method also requires a plasma set-up, but the vast majority of hydrophobic species can be grafted on. Examples include fatty acids, silanes and alkanes. Contact angles well above 110° are achieved by this method, and both fluorine and non-toxic species may be used for grafting. Graphical abstract: [Figure not available: see fulltext.]. © 2022, The Author(s).

Ort, förlag, år, upplaga, sidor
Springer Science and Business Media B.V., 2022
Nyckelord
Adsorption, Cellulose, Hydrophobisation, Plasma etching, Plasma grafting, Coatings, Contact angle, Environmental impact, Fatty acids, Fluorine, Grafting (chemical), Hydrophilicity, Hydrophobicity, Substrates, Surface active agents, Adsorption method, Hydrophobic matrix, Hydrophobizations, Lignocellulosic material, Lignocellulosic substrates, Matrix polymers, Physical adsorption, Physical modifications, Simple++, Copolymerization, Water, Wettability
Nationell ämneskategori
Fysikalisk kemi
Identifikatorer
urn:nbn:se:ri:diva-60012 (URN)10.1007/s10570-022-04620-8 (DOI)2-s2.0-85130756941 (Scopus ID)
Anmärkning

Funding details: Norges Forskningsråd, 274975; Funding text 1: The authors would like to acknowledge the Research Council of Norway and its funding of the NanoPlasma project (274975).

Tillgänglig från: 2022-10-07 Skapad: 2022-10-07 Senast uppdaterad: 2023-05-25Bibliografiskt granskad
Rodriguez Fabia, S., Torstensen, J., Johansson, L. & Syverud, K. (2022). Hydrophobization of lignocellulosic materials part II: chemical modification. Cellulose, 29, 8957-8995
Öppna denna publikation i ny flik eller fönster >>Hydrophobization of lignocellulosic materials part II: chemical modification
2022 (Engelska)Ingår i: Cellulose, ISSN 0969-0239, E-ISSN 1572-882X, Vol. 29, s. 8957-8995Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Lignocellulosic materials with hydrophobic properties are of great interest for developing sustainable products that can be used in various applications such as packaging, water-repellent and self-cleaning materials, oil and water separation or as reinforcements in biocomposite materials. The hydroxyl functional groups present in cellulose provide the possibility to perform various chemical modifications to the cellulosic substrates that can increase their hydrophobicity. This review is the second part of a comprehensive review on hydrophobization of lignocellulosic materials and summarizes the recent advances in the chemical modification of such substrates. The methods described in this review can provide changes in the hydrophilicity of the materials that range from a small decrease in the initial hydrophilicity of the substrate (contact angles below 90°) to superhydrophobic properties (contact angles above 150°). Additional attention has been paid to whether the modification is limited to the surface of the substrate or if it occurs in the bulk of the material. We also discuss hydrophobized cellulose material applications in packing and oil/water purification. Graphical abstract: [Figure not available: see fulltext.] © 2022, The Author(s).

Ort, förlag, år, upplaga, sidor
Springer Science and Business Media B.V., 2022
Nyckelord
Cellulose, Chemical modification, Grafting, Hydrophobization, Contact angle, Grafting (chemical), Hydrophilicity, Hydrophobicity, Packaging materials, Substrates, Hydrophobic properties, Hydrophobizations, Lignocellulosic material, Materials separations, Oil separation, Self-cleaning materials, Sustainable products, Water repellents, Water separation
Nationell ämneskategori
Kemi
Identifikatorer
urn:nbn:se:ri:diva-60310 (URN)10.1007/s10570-022-04824-y (DOI)2-s2.0-85137539206 (Scopus ID)
Anmärkning

Funding details: Norges Forskningsråd, 274975; Funding text 1: The authors would like to acknowledge the Research Council of Norway, and their funding of the NanoPlasma project (274975).

Tillgänglig från: 2022-10-10 Skapad: 2022-10-10 Senast uppdaterad: 2023-07-06Bibliografiskt granskad
Rodriguez Fabia, S., Torstensen, J., Johansson, L. & Syverud, K. (2022). Hydrophobization of lignocellulosic materials part III: modification with polymers. Cellulose, 29(11), 5943-5977
Öppna denna publikation i ny flik eller fönster >>Hydrophobization of lignocellulosic materials part III: modification with polymers
2022 (Engelska)Ingår i: Cellulose, ISSN 0969-0239, E-ISSN 1572-882X, Vol. 29, nr 11, s. 5943-5977Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

This review is the third part of a series of reviews on hydrophobization of lignocellulosic materials, a relevant topic nowadays, due to the need to replace fossil fuel-based materials. The review provides an overview of the hydrophobization of lignocellulosic materials by polymer adsorption, and both chemical and radiation-induced grafting of polymers. While adsorbed polymers are only attached to the surfaces by physical interactions, grafted polymers are chemically bonded to the materials. Radiation-induced grafting is typically the most environmentally friendly grafting technique, even though it provides little control on the polymer synthesis. On the other hand, controlled radical polymerization reactions are more complex but allow for the synthesis of polymers with elaborated architectures and well-defined properties. Overall, a wide range of contact angles can be obtained by polymer adsorption and grafting, from a slight increase in hydrophobicity to superhydrophobic properties. The choice of modification technique depends on the end-use of the modified material, but there is a clear trend towards the use of more environmentally friendly chemicals and processes and the grafting of polymers with complex structures. Graphical abstract: [Figure not available: see fulltext.]. © 2022, The Author(s).

Ort, förlag, år, upplaga, sidor
Springer Science and Business Media B.V., 2022
Nyckelord
Cellulose, Hydrophobization, Polymer adsorption, Polymer grafting, Adsorption, Fossil fuels, Hydrophobicity, Adsorbed polymers, Chemically bonded, Grafted polymers, Hydrophobizations, Lignocellulosic material, Physical interactions, Property, Radiation-induced grafting, Grafting (chemical), Copolymerization, Materials, Polymers, Review, Synthesis, Water Repellence
Nationell ämneskategori
Miljövetenskap
Identifikatorer
urn:nbn:se:ri:diva-59911 (URN)10.1007/s10570-022-04660-0 (DOI)2-s2.0-85132259855 (Scopus ID)
Anmärkning

 Correspondence Address: Rodríguez-Fabià, S.; RISE PFINorway; email: sandra.fabia@rise-pfi.no; Funding details: Norges Forskningsråd, 274975; Funding text 1: The authors would like to acknowledge the Research Council of Norway, and their funding of the NanoPlasma project (274975).

Tillgänglig från: 2022-08-11 Skapad: 2022-08-11 Senast uppdaterad: 2023-05-25Bibliografiskt granskad
Michel, B., Heggset, E. B., Syverud, K., Dufresne, A. & Bras, J. (2022). Inclusion complex formation between sulfadiazine and various modified β-cyclodextrins and characterization of the complexes. Journal of Drug Delivery Science and Technology, 76, Article ID 103814.
Öppna denna publikation i ny flik eller fönster >>Inclusion complex formation between sulfadiazine and various modified β-cyclodextrins and characterization of the complexes
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2022 (Engelska)Ingår i: Journal of Drug Delivery Science and Technology, ISSN 1773-2247, Vol. 76, artikel-id 103814Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

β-Cyclodextrin (β-CD) and its derivatives are cyclic oligosaccharides which present the ability to form inclusion complexes with hydrophobic molecules and can bring new functionalities to a wide range of materials. As of today, the most used prophylactic drugs for wound dressing applications are sulfadiazine (SD) and its derivatives silver sulfadiazine (SSD). These drugs are used to prevent infections of the wounds; however, their low intrinsic water-solubility is a hindrance to their use. In this study, the inclusion complex formation between SD/SSD and the various β-CDs were assessed with various protocols. Isothermal Titration Calorimetry (ITC) experiments led to the conclusion that the formation constants measured for SD and SSD are sufficiently similar meaning that SD can be considered as a satisfactory model molecule. Phase Solubility Diagram (PSD) were built for SD and the various β-CDs, highlighting a 1:1 stoichiometry of inclusion and a linear increase in solubility of SD with increasing concentration of β-CDs- The formation constant ranged from 197 M−1 to 245 M−1 for the different β-CDs. X-Ray diffraction (XRD) and Differential Scanning Calorimetry (DSC) experiments revealed the different physico-chemical properties affected by the formation of an inclusion complex. Finally, Nuclear Magnetic Resonance (NMR) experiments confirmed the depth of penetration of SD inside the β-CDs cavity as well as the orientation of SD, highlighting the fact that CM-β-CDs induce a deeper penetration than other β-CDs.

Ort, förlag, år, upplaga, sidor
Editions de Sante, 2022
Nationell ämneskategori
Fysikalisk kemi
Identifikatorer
urn:nbn:se:ri:diva-63089 (URN)10.1016/j.jddst.2022.103814 (DOI)2-s2.0-85142698857 (Scopus ID)
Anmärkning

 Funding details: Norges Teknisk-Naturvitenskapelige Universitet, NTNU; Funding details: Agence Nationale de la Recherche, ANR, ANR-15-IDEX-02; Funding details: Labex, ANR-11-LABX-0030; Funding details: Department of Chemical Engineering, Universiti Teknologi Petronas; Funding details: European Regional Development Fund, ERDF; Funding details: Région Auvergne-Rhône-Alpes; Funding details: Institut Carnot PolyNat, ANR-16-CARN-0025-01; Funding text 1: This work is supported by the French National Research Agency in the framework of the “Investissements d'avenir” program Glyco@Alps (ANR-15-IDEX-02) and NTNU through its Department of Chemical Engineering. LGP2 is part of the LabEx Tec 21 (Investissements d'Avenir—Grant Agreement No. ANR-11-LABX-0030) and of the PolyNat Carnot Institute (Investissements d'Avenir—Grant Agreement No. ANR-16-CARN-0025-01).This research was made possible thanks to the facilities of the TekLiCell platform funded by the Région Rhône-Alpes (ERDF: European regional development fund). E. Gillon and A. Imberty (Cermav) for lab support with ITC, I. Jeacommine (Cermav) for NMR measurements and T. Encinas (CMTC) for XRD measurements.; Funding text 2: This work is supported by the French National Research Agency in the framework of the “Investissements d'avenir” program Glyco@Alps ( ANR-15-IDEX-02 ) and NTNU through its Department of Chemical Engineering. LGP2 is part of the LabEx Tec 21 (Investissements d’Avenir—Grant Agreement No. ANR-11-LABX-0030 ) and of the PolyNat Carnot Institute (Investissements d’Avenir—Grant Agreement No. ANR-16-CARN-0025-01 ).This research was made possible thanks to the facilities of the TekLiCell platform funded by the Région Rhône-Alpes (ERDF: European regional development fund) . E. Gillon and A. Imberty (Cermav) for lab support with ITC, I. Jeacommine (Cermav) for NMR measurements and T. Encinas (CMTC) for XRD measurements.

Tillgänglig från: 2023-01-25 Skapad: 2023-01-25 Senast uppdaterad: 2023-05-25Bibliografiskt granskad
Fall, A., Henriksson, M., Karppinen, A., Opstad, A., Heggset, E. B. & Syverud, K. (2022). The effect of ionic strength and pH on the dewatering rate of cellulose nanofibril dispersions. Cellulose, 29(14), 7649-7662
Öppna denna publikation i ny flik eller fönster >>The effect of ionic strength and pH on the dewatering rate of cellulose nanofibril dispersions
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2022 (Engelska)Ingår i: Cellulose, ISSN 0969-0239, E-ISSN 1572-882X, Vol. 29, nr 14, s. 7649-7662Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Cellulose nanofibrils, CNFs, show great potential in many application areas. One main aspect limiting the industrial use is the slow and energy demanding dewatering of CNF suspensions. Here we investigate the dewatering with a piston press process. Three different CNF grades were dewatered to solid contents between approx. 20 and 30%. The CNF grades varied in charge density (30, 106 and 604 µmol/g) and fibrillation degree. The chemical conditions were varied by changing salt concentration (NaCl) and pH and the dewatering rates were compared before and after these changes. For the original suspensions, a higher charge provides slower dewatering with the substantially slowest dewatering for the highest charged CNFs. However, by changing the conditions it dewatered as fast as the two lower charged CNFs, even though the salt/acid additions also improved the dewatering rate for these two CNFs. Finally, by tuning the conditions, fast dewatering could be obtained with only minor effect on film properties (strength and oxygen barrier) produced from redispersed dispersion. However, dewatering gives some reduction in viscosity of the redispersed dispersions. This may be a disadvantage if the CNF application is as e.g. rheology modifier or emulsion stabilizer. Graphical abstract: [Figure not available: see fulltext.].

Ort, förlag, år, upplaga, sidor
Springer Science and Business Media B.V., 2022
Nyckelord
Cellulose nanofibrils, Dewatering, Nanocelluloses, Redispersion, Rheology, Dispersions, Elasticity, Emulsification, Ionic strength, Nanofibers, Sodium chloride, Application area, Condition, Effect of ionic strength, Energy, Industrial use, Nano-cellulose, Press process, Redispersions, Solids content, Nanocellulose
Nationell ämneskategori
Materialteknik
Identifikatorer
urn:nbn:se:ri:diva-59856 (URN)10.1007/s10570-022-04719-y (DOI)2-s2.0-85134482558 (Scopus ID)
Anmärkning

Correspondence Address: Syverud, K.; RISE PFI, Høgskoleringen 6b, Norway; email: kristin.syverud@rise-pfi.no; Funding details: Norges Forskningsråd, 245300, 274975; Funding text 1: Open access funding provided by RISE Research Institutes of Sweden. This work was a part of the project NanoVisc: “Development of high-performance viscosifiers and texture ingredients for industrial applications based on Cellulose Nanofibrils (CNF)” financed by the Research Council of Norway through the Nano2021 programme (Grant No. 245300), and the companies Borregaard, Mercer, and Stora Enso. Part of the work has also been funded through the project NanoPlasma: Nanofibril production using plasma (Grant No. 274975) and from RISE.

Tillgänglig från: 2022-08-02 Skapad: 2022-08-02 Senast uppdaterad: 2023-12-06Bibliografiskt granskad
Torstensen, J., Ottesen, V., Rodriguez Fabia, S., Syverud, K., Johansson, L. & Lervik, A. (2022). The influence of temperature on cellulose swelling at constant water density. Scientific Reports, 12(1), Article ID 20736.
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2022 (Engelska)Ingår i: Scientific Reports, E-ISSN 2045-2322, Vol. 12, nr 1, artikel-id 20736Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We have in this paper investigated how water sorbs to cellulose. We found that both cellulose nanofibril (CNF) and cellulose nanocrystal (CNC) films swell similarly, as they are both mainly composed of cellulose. CNF/CNC films subjected to water at 0.018 kg/m3 at 25 °C and 39 °C, showed a decrease in swelling from ~ 8 to 2%. This deswelling increased the tensile index of CNF-films by ~ 13%. By molecular modeling of fibril swelling, we found that water sorbed to cellulose exhibits a decreased diffusion constant compared to bulk water. We quantified this change and showed that diffusion of sorbed water displays less dependency on swelling temperature compared to bulk water diffusion. To our knowledge, this has not previously been demonstrated by molecular modeling. The difference between bulk water diffusion (DWW) and diffusion of water sorbed to cellulose (DCC) increased from DWW − DCC ~ 3 × 10–5 cm/s2 at 25 °C to DWW − DCC ~ 8.3 × 10–5 cm/s2 at 100 °C. Moreover, water molecules spent less successive time sorbed to a fibril at higher temperatures. © 2022, The Author(s).

Ort, förlag, år, upplaga, sidor
Nature Research, 2022
Nyckelord
cellulose, water, diffusion, edema, human, temperature, Humans
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:ri:diva-61540 (URN)10.1038/s41598-022-22092-5 (DOI)2-s2.0-85143183851 (Scopus ID)
Anmärkning

 Funding details: 274975; Funding details: NN9718k; Funding details: Norges Forskningsråd, 245963/F50; Funding text 1: The molecular dynamics simulations were performed on resources provided by UNINETT Sigma2—the National Infrastructure for High-Performance Computing and Data Storage in Norway, project number NN9718k. Johnny K. Melbø and Kenneth Aasarød (RISE PFI) are acknowledged for being extremely helpful with the lab work. The Research Council of Norway is acknowledged for supporting the Norwegian Micro- and Nano-Fabrication Facility, NorFab, project number 245963/F50. We greatly acknowledge the Research Counsel of Norway and their funding of the NanoPlasma project (274975). The cotton linters used in the experiments were provided by Celsur, Spain. Mechanical fibrillation of cotton linter was performed at RISE-PFI.; Funding text 2: The molecular dynamics simulations were performed on resources provided by UNINETT Sigma2—the National Infrastructure for High-Performance Computing and Data Storage in Norway, project number NN9718k. Johnny K. Melbø and Kenneth Aasarød (RISE PFI) are acknowledged for being extremely helpful with the lab work. The Research Council of Norway is acknowledged for supporting the Norwegian Micro- and Nano-Fabrication Facility, NorFab, project number 245963/F50. We greatly acknowledge the Research Counsel of Norway and their funding of the NanoPlasma project (274975). The cotton linters used in the experiments were provided by Celsur, Spain. Mechanical fibrillation of cotton linter was performed at RISE-PFI.

Tillgänglig från: 2022-12-19 Skapad: 2022-12-19 Senast uppdaterad: 2023-05-25Bibliografiskt granskad
Organisationer
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0003-2271-3637

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