Biologically Inspired High Performance Material - Coacervation of genetically engineered silk-like fusion proteins as an intermediate step toward fabrication of next generation fiber, adhesive and composite

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Linder, Markus, Prof., Aalto University, Department of Bioproducts and Biosystems, Finland
dc.contributor.author Mohammadi, Pezhman
dc.date.accessioned 2018-11-21T10:03:25Z
dc.date.available 2018-11-21T10:03:25Z
dc.date.issued 2018
dc.identifier.isbn 978-952-60-8289-9 (electronic)
dc.identifier.isbn 978-952-60-8288-2 (printed)
dc.identifier.issn 1799-4942 (electronic)
dc.identifier.issn 1799-4934 (printed)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/34803
dc.description.abstract Nature can serve as a source of inspiration for the design of the next generation high performance materials. Proteins can play a major role in structuring the novel sustainable and advanced functional materials. Given the precise design of proteins at molecular level together with expanding knowledge of new protein sequences, the ease of gene synthesis, cloning strategies and optimized biological production, various potential designs and applications can be anticipated. However, one of the main challenge toward this goal is the lack of understanding of the processes in which such materials could be assembled and form their functional molecular interactions. Inspired by the natural structural material, this thesis highlights solutions to some of the fundamental challenges related to the design strategies and processing routes with the extends the scopes toward potential applications. In publication 1, the general problem of how to directly assemble genetically engineered and recombinantly produced fusion proteins toward functional states was touched from a biological structural materials perspective. This was approached by exploring how the overall protein architecture and modularity affect liquid-liquid demixing and coacervate formation as the functioning intermediate entities toward assemblies of protein based fiber and also adhesive fiber. In publication 2, the nature of phase separated liquid-like coacervate assemblies was characterized in detail using various state-of-the-art techniques. Overall, the assemblies showed a range of properties including low surface tension, low viscosity, fast molecular diffusion, coalescence, cohesiveness and difformability under shear flow. It was further demonstrated how these could be used as an intermediate state for strong water based assemblies between various cellulosic surfaces. In publication 3, cellulose nanofibril (CNF) was used to fabricate high performance fibers with exceptional mechanical properties. This was carried out by exploring how CNF could be aligned under shear forces while being extruded through rela-tively long and thin capillaries.In publication 4, the central challenge of biocomposite mimicry as to how to minimize stress singularity at interfaces of dissimilar components for achieving high toughness was approached. This was carried out by effective infiltration and crosslinking of oriented CNF network (publication 3) through the use of low surface energy, adhesive and energy dissipating phase separated coacervates (publication 1 and 2). The resulting material showed exceptional strength, stiffness and overall toughness. en
dc.format.extent 52 + app. 50
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS en
dc.relation.ispartofseries 222/2018
dc.relation.haspart [Publication 1]: Mohammadi, Pezhman, A. Sesilja Aranko, Laura Lemetti, Zoran Cenev, Quan Zhou, Salla Virtanen, Christopher P. Landowski, Merja Penttilä, Wolfgang J. Fischer, Wolfgang Wagermaier & Markus B. Linder "Phase transitions as intermediate steps in the formation of molecularly engineered protein fibers." Communications Biology 1.1 (2018): 86. Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-201809215148 . DOI: 10.1038/s42003-018-0090-y
dc.relation.haspart [Publication 2]: Mohammadi, Pezhman, Grégory Beaune, Bjørn Torger Stokke, Jaakko Timonen & Markus B. Linder. “Self-coacervation of a silk-like protein and its use as an adhesive for cellulosic materials." Submitted manuscript the journal of American chemical society ACS Macro Letters in the year 2018. Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-201812106254. DOI: 10.1021/acsmacrolett.8b00527
dc.relation.haspart [Publication 3]: Mohammadi, Pezhman, Matti S. Toivonen, Olli Ikkala, Wolfgang Wagermaier & Markus B. Linder "Aligning cellulose nanofibril dispersions for tougher fibers." Scientific Reports 7.1 (2017): 11860. Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-201710157214 . DOI: 10.1038/s41598-017-12107-x
dc.relation.haspart [Publication 4]: Mohammadi, Pezhman, A Sesilja Aranko, Christopher Paul Landowski, Olli Ikkala, Wolfgang Wagermaier and Markus B Linder “Design and assembly principles for silk-inspired proteins in high-toughness biomimetic nanocellulose composites." Submitted manuscript to the journal of Wiley-VCH Angewandte Chemie International Edition in the year 2018.
dc.subject.other Biotechnology en
dc.subject.other Materials science en
dc.title Biologically Inspired High Performance Material - Coacervation of genetically engineered silk-like fusion proteins as an intermediate step toward fabrication of next generation fiber, adhesive and composite en
dc.type G5 Artikkeliväitöskirja fi
dc.contributor.school Kemian tekniikan korkeakoulu fi
dc.contributor.school School of Chemical Technology en
dc.contributor.department Biotuotteiden ja biotekniikan laitos fi
dc.contributor.department Department of Bioproducts and Biosystems en
dc.subject.keyword genetic engineering en
dc.subject.keyword recombinant DNA technology en
dc.subject.keyword protein engineering en
dc.subject.keyword coacervate en
dc.subject.keyword spider silk en
dc.subject.keyword fiber en
dc.subject.keyword adhesive en
dc.subject.keyword nanocomposite en
dc.subject.keyword toughness en
dc.subject.keyword biomaterial en
dc.subject.keyword cellulose en
dc.identifier.urn URN:ISBN:978-952-60-8289-9
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (article-based) en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.contributor.supervisor Linder, Markus, Prof., Aalto University, Department of Bioproducts and Biosystems, Finland
dc.opn Birkedal, Henrik, Prof., Aarhus University, Denmark
dc.contributor.lab Group of Biomolecular Materials en
dc.rev Harrington, Matthew, Prof., McGill University, Canada
dc.rev Kamperman, Marleen, Prof., University of Groningen, Nederlands
dc.date.defence 2018-12-07
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