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dc.contributor.authorBroderick, Kurt A.
dc.contributor.authorBuehler, Markus J.
dc.contributor.authorBuyukozturk, Oral
dc.contributor.authorLau, Denvid
dc.date.accessioned2015-03-03T19:37:06Z
dc.date.available2015-03-03T19:37:06Z
dc.date.issued2014-08
dc.date.submitted2014-02
dc.identifier.issn0027-8424
dc.identifier.issn1091-6490
dc.identifier.urihttp://hdl.handle.net/1721.1/95767
dc.description.abstractAccurate measurement of interfacial properties is critical any time two materials are bonded—in composites, tooth crowns, or when biomaterials are attached to the human body. Yet, in spite of this importance, reliable methods to measure interfacial properties between dissimilar materials remain elusive. Here we present an experimental approach to quantify the interfacial fracture energy Γ[subscript i] that also provides unique mechanistic insight into the interfacial debonding mechanism at the nanoscale. This approach involves deposition of an additional chromium layer (superlayer) onto a bonded system, where interface debonding is initiated by the residual tensile stress in the superlayer, and where the interface can be separated in a controlled manner and captured in situ. Contrary to earlier methods, our approach allows the entire bonded system to remain in an elastic range during the debonding process, such that Γ[subscript i] can be measured accurately. We validate the method by showing that moisture has a degrading effect on the bonding between epoxy and silica, a technologically important interface. Combining in situ through scanning electron microscope images with molecular simulation, we find that the interfacial debonding mechanism is hierarchical in nature, which is initiated by the detachment of polymer chains, and that the three-dimensional covalent network of the epoxy-based polymer may directly influence water accumulation, leading to the reduction of Γ[subscript i] under presence of moisture. The results may enable us to design more durable concrete composites that could be used to innovate transportation systems, create more durable buildings and bridges, and build resilient infrastructure.en_US
dc.description.sponsorshipNational Science Foundation (U.S.) (Grant CMS-0856325)en_US
dc.language.isoen_US
dc.publisherNational Academy of Sciences (U.S.)en_US
dc.relation.isversionofhttp://dx.doi.org/10.1073/pnas.1402893111en_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.sourceNational Academy of Sciences (U.S.)en_US
dc.titleA robust nanoscale experimental quantification of fracture energy in a bilayer material systemen_US
dc.typeArticleen_US
dc.identifier.citationLau, D., K. Broderick, M. J. Buehler, and O. Buyukozturk. “A Robust Nanoscale Experimental Quantification of Fracture Energy in a Bilayer Material System.” Proceedings of the National Academy of Sciences 111, no. 33 (August 5, 2014): 11990–11995.en_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Civil and Environmental Engineeringen_US
dc.contributor.departmentMassachusetts Institute of Technology. Microsystems Technology Laboratoriesen_US
dc.contributor.mitauthorBroderick, Kurt A.en_US
dc.contributor.mitauthorBuehler, Markus J.en_US
dc.contributor.mitauthorBuyukozturk, Oralen_US
dc.contributor.mitauthorLau, Denviden_US
dc.relation.journalProceedings of the National Academy of Sciences of the United States of Americaen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dspace.orderedauthorsLau, Denvid; Broderick, Kurt; Buehler, Markus J.; Buyukozturk, Oralen_US
dc.identifier.orcidhttps://orcid.org/0000-0002-4173-9659
dc.identifier.orcidhttps://orcid.org/0000-0002-7712-7478
mit.licensePUBLISHER_POLICYen_US


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