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

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorVerho, Tuukkaen_US
dc.contributor.authorKarppinen, Pasien_US
dc.contributor.authorGröschel, André H.en_US
dc.contributor.authorIkkala, Ollien_US
dc.contributor.departmentDepartment of Applied Physicsen
dc.contributor.groupauthorMolecular Materialsen
dc.date.accessioned2018-02-09T10:04:47Z
dc.date.available2018-02-09T10:04:47Z
dc.date.issued2018en_US
dc.description| openaire: EC/FP7/291364/EU//MIMEFUN
dc.description.abstractMollusk 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.description.versionPeer revieweden
dc.format.extent7
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationVerho, 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.201700635en
dc.identifier.doi10.1002/advs.201700635en_US
dc.identifier.issn2198-3844
dc.identifier.otherPURE UUID: b8f507b9-eb6d-4871-8f26-ddd3dfc51b86en_US
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/b8f507b9-eb6d-4871-8f26-ddd3dfc51b86en_US
dc.identifier.otherPURE LINK: http://www.scopus.com/inward/record.url?scp=85038254523&partnerID=8YFLogxKen_US
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/18027069/Verho_et_al_2018_Advanced_Science.pdfen_US
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/29959
dc.identifier.urnURN:NBN:fi:aalto-201802091456
dc.language.isoenen
dc.relationinfo:eu-repo/grantAgreement/EC/FP7/291364/EU//MIMEFUNen_US
dc.relation.ispartofseriesAdvanced Scienceen
dc.rightsopenAccessen
dc.subject.keywordBiomimeticsen_US
dc.subject.keywordMechanical propertiesen_US
dc.subject.keywordNanocompositesen_US
dc.subject.keywordProcess zoneen_US
dc.subject.keywordToughnessen_US
dc.titleImaging Inelastic Fracture Processes in Biomimetic Nanocomposites and Nacre by Laser Speckle for Better Toughnessen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
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