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Jain, K., Wang, Z., Garma, L. D., Engel, E., Ciftci, G. C., Fager, C., . . . Wågberg, L. (2023). 3D printable composites of modified cellulose fibers and conductive polymers and their use in wearable electronics. APPLIED MATERIALS TODAY, 30, Article ID 101703.
Open this publication in new window or tab >>3D printable composites of modified cellulose fibers and conductive polymers and their use in wearable electronics
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2023 (English)In: APPLIED MATERIALS TODAY, ISSN 2352-9407, Vol. 30, article id 101703Article in journal (Refereed) Published
Abstract [en]

There are many bioelectronic applications where the additive manufacturing of conductive polymers may be of use. This method is cheap, versatile and allows fine control over the design of wearable electronic devices. Nanocellulose has been widely used as a rheology modifier in bio-based inks that are used to print electrical components and devices. However, the preparation of nanocellulose is energy and time consuming. In this work an easy-to-prepare, 3D-printable, conductive bio-ink; based on modified cellulose fibers and poly(3,4-ethylene dioxythiophene) poly(styrene sulfonate) (PEDOT:PSS), is presented. The ink shows excellent printability, the printed samples are wet stable and show excellent electrical and electrochemical performance. The printed structures have a conductivity of 30 S/cm, high tensile strains (>40%), and specific capacitances of 211 F/g; even though the PEDOT:PSS only accounts for 40 wt% of the total ink composition. Scanning electron microscopy (SEM), wide-angle X-ray scattering (WAXS), and Raman spectroscopy data show that the modified cellulose fibers induce conformational changes and phase separation in PEDOT:PSS. It is also demonstrated that wearable supercapacitors and biopotential-monitoring devices can be prepared using this ink.

Place, publisher, year, edition, pages
Elsevier BV, 2023
Keywords
Dialcohol-modified cellulose fibers, 3D printing, Conducting polymer, PEDOT:PSS, Bioelectronics
National Category
Textile, Rubber and Polymeric Materials Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-323583 (URN)10.1016/j.apmt.2022.101703 (DOI)000912019800001 ()2-s2.0-85143488124 (Scopus ID)
Note

QC 20230208

Available from: 2023-02-08 Created: 2023-02-08 Last updated: 2023-02-08Bibliographically approved
Lo Re, G., Engel, E. R., Bjorn, L., Sicairos, M. G., Liebi, M., Wahlberg, J., . . . Larsson, P. A. (2023). Melt processable cellulose fibres engineered for replacing oil-based thermoplastics. Chemical Engineering Journal, 458, 141372, Article ID 141372.
Open this publication in new window or tab >>Melt processable cellulose fibres engineered for replacing oil-based thermoplastics
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2023 (English)In: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 458, p. 141372-, article id 141372Article in journal (Refereed) Published
Abstract [en]

If cellulosic materials are to replace materials derived from non-renewable resources, it is necessary to overcome intrinsic limitations such as fragility, permeability to gases, susceptibility to water vapour and poor three-dimensional shaping. Novel properties or the enhancement of existing properties are required to expand the applications of cellulosic materials and will create new market opportunities. Here we have overcome the well-known restrictions that impede melt-processing of high cellulose content composites. Cellulose fibres, partially derivatised to dialcohol cellulose, have been used to manufacture three-dimensional high-density materials by conventional melt processing techniques, with or without the addition of a thermoplastic polymer. This work demonstrates the use of melt processable chemically modified cellulose fibres in the preparation of a new generation of highly sustainable materials with tuneable properties that can be tailored for specific applications requiring complex three-dimensional parts.

Place, publisher, year, edition, pages
Elsevier BV, 2023
Keywords
Dialcohol cellulose, Melt processing, Cellulose composite, Ethylene acrylic acid copolymer
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-324327 (URN)10.1016/j.cej.2023.141372 (DOI)000923645900001 ()2-s2.0-85146173480 (Scopus ID)
Note

QC 20230227

Available from: 2023-02-27 Created: 2023-02-27 Last updated: 2023-02-27Bibliographically approved
Mehandzhiyski, A. Y., Engel, E., Larsson, P. A., Re, G. L. & Zozoulenko, I. V. (2022). Microscopic Insight into the Structure-Processing-Property Relationships of Core-Shell Structured Dialcohol Cellulose Nanoparticles. ACS Applied Bio Materials, 5(10), 4793-4802
Open this publication in new window or tab >>Microscopic Insight into the Structure-Processing-Property Relationships of Core-Shell Structured Dialcohol Cellulose Nanoparticles
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2022 (English)In: ACS Applied Bio Materials, E-ISSN 2576-6422, Vol. 5, no 10, p. 4793-4802Article in journal (Refereed) Published
Abstract [en]

In the quest to develop sustainable and environmentally friendly materials, cellulose is a promising alternative to synthetic polymers. However, native cellulose, in contrast to many synthetic polymers, cannot be melt-processed with traditional techniques because, upon heating, it degrades before it melts. One way to improve the thermoplasticity of cellulose, in the form of cellulose fibers, is through chemical modification, for example, to dialcohol cellulose fibers. To better understand the importance of molecular interactions during melt processing of such modified fibers, we undertook a molecular dynamics study of dialcohol cellulose nanocrystals with different degrees of modification. We investigated the structure of the nanocrystals as well as their interactions with a neighboring nanocrystal during mechanical shearing, Our simulations showed that the stress, interfacial stiffness, hydrogen-bond network, and cellulose conformations during shearing are highly dependent on the degree of modification, water layers between the crystals, and temperature. The melt processing of dialcohol cellulose with different degrees of modification and/or water content in the samples was investigated experimentally by fiber extrusion with water used as a plasticizer. The melt processing was easier when increasing the degree of modification and/or water content in the samples, which was in agreement with the conclusions derived from the molecular modeling. The measured friction between the two crystals after the modification of native cellulose to dialcohol cellulose, in some cases, halved (compared to native cellulose) and is also reduced with increasing temperature. Our results demonstrate that molecular modeling of modified nanocellulose fibers can provide fundamental information on the structure-property relationships of these materials and thus is valuable for the development of new cellulose-based biomaterials.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2022
Keywords
core-shell structure, dialcohol cellulose, mechanical shearing, melt processing, molecular dynamics, Biomaterials, Cellulose derivatives, Chemical modification, Crystal structure, Hydrogen bonds, Nanocrystals, Natural fibers, Shells (structures), Synthetic polymers, Textile fibers, Cellulose fiber, Core shell, Core shell structure, Degree of modification, Native cellulose, Processing properties, Cellulose
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-328344 (URN)10.1021/acsabm.2c00505 (DOI)000870068600001 ()36194435 (PubMedID)2-s2.0-85139729184 (Scopus ID)
Note

QC 20230607

Available from: 2023-06-07 Created: 2023-06-07 Last updated: 2023-06-07Bibliographically approved
Engel, E. & Scott, J. L. (2020). Advances in the green chemistry of coordination polymer materials. Green Chemistry, 22(12), 3693-3715
Open this publication in new window or tab >>Advances in the green chemistry of coordination polymer materials
2020 (English)In: Green Chemistry, ISSN 1463-9262, E-ISSN 1463-9270, Vol. 22, no 12, p. 3693-3715Article, review/survey (Refereed) Published
Abstract [en]

Coordination polymers, including metal-organic frameworks, are a diverse class of materials with myriad properties and potential applications. However, a number of drawbacks have hindered the scaling up of such materials towards commercial applications. These include health and safety risks, environmental hazards, poor cost efficiency and sustainability shortfalls. In contrast to the systematic progress of organic green chemistry, which has contributed to improvements in the sustainability of chemical processing, the development of green chemistry in the context of coordination polymers has been fragmented and sporadic. This review describes advances in the use of green components: benign sustainable ligands and non-hazardous earth abundant metals. Additionally, solvent considerations, synthesis strategies for improved sustainability and the performance of coordination polymers relative to alternative competing materials are discussed.

Place, publisher, year, edition, pages
Royal Society of Chemistry (RSC), 2020
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-278624 (URN)10.1039/d0gc01074j (DOI)000544314300002 ()2-s2.0-85087439918 (Scopus ID)
Note

QC 20200727

Available from: 2020-07-27 Created: 2020-07-27 Last updated: 2022-06-26Bibliographically approved
Engel, E., Calabrese, V., Hossain, K. M. Z., Edler, K. J. & Scott, J. L. (2020). Composite Hydrogel Spheroids Based on Cellulose Nanofibrils and Nanofibrous Chiral Coordination Polymer by Green Synthesis. Advanced Sustainable Systems
Open this publication in new window or tab >>Composite Hydrogel Spheroids Based on Cellulose Nanofibrils and Nanofibrous Chiral Coordination Polymer by Green Synthesis
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2020 (English)In: Advanced Sustainable Systems, ISSN 2366-7486Article in journal (Refereed) Published
Abstract [en]

Cellulose-based hydrogels are promising sustainable materials for a variety of applications, including tissue engineering, water treatment, and drug delivery. However, the tailoring of diverse properties by efficient green chemistry methods is an ongoing challenge. Here, composite hydrogels of consistent spheroidal structure, incorporating TEMPO-oxidized cellulose nanofibrils and nanofibrous chiral Cu(II) aspartate coordination polymer, are presented. The hydrogels are prepared by a single-step procedure in aqueous media at ambient temperature and pressure, adhering to the principles of green chemistry. With a view to adapting this method for a variety of alternative coordination polymers (to tailor functional properties), the following critical factors for formation of robust composite hydrogel spheroids are identified: rheological properties of the primary matrix used for spheroidal hydrogel formation and coordination polymer self-assembly rate.

Place, publisher, year, edition, pages
Wiley-VCH Verlag, 2020
Keywords
cellulose nanofibrils, coordination polymers, hydrogels, ion-induced gelation, TEMPO-oxidized cellulose, Cellulose, Cellulose nanocrystals, Coordination reactions, Copper compounds, Drug delivery, Green Synthesis, Nanofibers, Stereochemistry, Tissue engineering, Water treatment, Composite hydrogels, Diverse properties, Functional properties, Rheological property, Sustainable materials, Temperature and pressures, Polymer matrix composites
National Category
Polymer Chemistry Bio Materials
Identifiers
urn:nbn:se:kth:diva-285322 (URN)10.1002/adsu.202000069 (DOI)000573845000001 ()2-s2.0-85091730061 (Scopus ID)
Note

QC 20201202

Available from: 2020-12-02 Created: 2020-12-02 Last updated: 2024-01-10Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-6167-6432

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