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Ultrastrong and Bioactive Nanostructured Bio-Based Composites
KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
KTH, School of Biotechnology (BIO), Protein Technology.
KTH, School of Biotechnology (BIO), Protein Technology.
KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center. KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
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2017 (English)In: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086XArticle in journal (Refereed) Published
Abstract [en]

Nature’s design of functional materials relies on smart combinations of simple components to achieve desired properties. Silk and cellulose are two clever examples from nature–spider silk being tough due to high extensibility, whereas cellulose possesses unparalleled strength and stiffness among natural materials. Unfortunately, silk proteins cannot be obtained in large quantities from spiders, and recombinant production processes are so far rather expensive. We have therefore combined small amounts of functionalized recombinant spider silk proteins with the most abundant structural component on Earth (cellulose nanofibrils (CNFs)) to fabricate isotropic as well as anisotropic hierarchical structures. Our approach for the fabrication of bio-based anisotropic fibers results in previously unreached but highly desirable mechanical performance with a stiffness of ∼55 GPa, strength at break of ∼1015 MPa, and toughness of ∼55 MJ m–3. We also show that addition of small amounts of silk fusion proteins to CNF results in materials with advanced biofunctionalities, which cannot be anticipated for the wood-based CNF alone. These findings suggest that bio-based materials provide abundant opportunities to design composites with high strength and functionalities and bring down our dependence on fossil-based resources.

Place, publisher, year, edition, pages
2017.
National Category
Materials Chemistry Polymer Chemistry Biochemistry and Molecular Biology
Research subject
Chemistry; Biotechnology
Identifiers
URN: urn:nbn:se:kth:diva-206974DOI: 10.1021/acsnano.7b02305OAI: oai:DiVA.org:kth-206974DiVA: diva2:1094803
Funder
Knut and Alice Wallenberg Foundation
Note

QC 2170517

Available from: 2017-05-11 Created: 2017-05-11 Last updated: 2017-05-17Bibliographically approved

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Publisher's full texthttp://pubs.acs.org/doi/abs/10.1021/acsnano.7b02305

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Mittal, NiteshWidhe, MonaBenselfelt, TobiasLundell, FredrikHedhammar, MySöderberg, Daniel
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Wallenberg Wood Science CenterLinné Flow Center, FLOWProtein TechnologyFibre and Polymer Technology
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ACS Nano
Materials ChemistryPolymer ChemistryBiochemistry and Molecular Biology

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