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Imaging Inelastic Fracture Processes in Biomimetic Nanocomposites and Nacre by Laser Speckle for Better Toughness

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Verho, Tuukka
dc.contributor.author Karppinen, Pasi
dc.contributor.author Gröschel, André H.
dc.contributor.author Ikkala, Olli
dc.date.accessioned 2018-02-09T10:04:47Z
dc.date.available 2018-02-09T10:04:47Z
dc.date.issued 2018
dc.identifier.citation Verho , T , Karppinen , P , Gröschel , A H & Ikkala , O 2018 , ' Imaging Inelastic Fracture Processes in Biomimetic Nanocomposites and Nacre by Laser Speckle for Better Toughness ' , Advanced Science , vol. 5 , no. 1 , 170-174 , pp. 1-7 . https://doi.org/10.1002/advs.201700635 en
dc.identifier.issn 2198-3844
dc.identifier.other PURE UUID: b8f507b9-eb6d-4871-8f26-ddd3dfc51b86
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/b8f507b9-eb6d-4871-8f26-ddd3dfc51b86
dc.identifier.other PURE LINK: http://www.scopus.com/inward/record.url?scp=85038254523&partnerID=8YFLogxK
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/18027069/Verho_et_al_2018_Advanced_Science.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/29959
dc.description | openaire: EC/FP7/291364/EU//MIMEFUN
dc.description.abstract Mollusk nacre is a prototypical biological inorganic-organic composite that combines high toughness, stiffness, and strength by its brick-and-mortar microstructure, which has inspired several synthetic mimics. Its remarkable fracture toughness relies on inelastic deformations at the process zone at the crack tip that dissolve stress concentrations and stop cracks. The micrometer-scale structure allows resolving the size and shape of the process zone to understand the fracture processes. However, for better scalability, nacre-mimetic nanocomposites with aligned inorganic or graphene nanosheets are extensively pursued, to avoid the packing problems of mesoscale sheets like in nacre or slow in situ biomineralization. This calls for novel methods to explore the process zone of biomimetic nanocomposites. Here the fracture of nacre and nacre-inspired clay/polymer nanocomposite is explored using laser speckle imaging that reveals the process zone even in absence of changes in optical scattering. To demonstrate the diagnostic value, compared to nacre, the nacre-inspired nanocomposite develops a process zone more abruptly with macroscopic crack deflection shown by a flattened process zone. In situ scanning electron microscopy suggests similar toughening mechanisms in nanocomposite and nacre. These new insights guide the design of nacre-inspired nanocomposites toward better mechanical properties to reach the level of synergy of their biological model. en
dc.format.extent 7
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation info:eu-repo/grantAgreement/EC/FP7/291364/EU//MIMEFUN
dc.relation.ispartofseries Advanced Science en
dc.rights openAccess en
dc.title Imaging Inelastic Fracture Processes in Biomimetic Nanocomposites and Nacre by Laser Speckle for Better Toughness en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Department of Applied Physics
dc.contributor.department ProtoRhino Ltd
dc.contributor.department University of Duisburg-Essen
dc.contributor.department Molecular Materials
dc.subject.keyword Biomimetics
dc.subject.keyword Mechanical properties
dc.subject.keyword Nanocomposites
dc.subject.keyword Process zone
dc.subject.keyword Toughness
dc.identifier.urn URN:NBN:fi:aalto-201802091456
dc.identifier.doi 10.1002/advs.201700635
dc.type.version publishedVersion

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