Quantitative analysis of orientation distribution of graphene platelets in nanocomposites using TEM

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dc.authorid0000-0003-4660-0020
dc.authorid0000-0003-3338-3311
dc.authorid0000-0002-6313-7157
dc.contributor.authorBayrak, Osman
dc.contributor.authorTashkinov, Mikhail
dc.contributor.authorSilberschmidt, Vadim V.
dc.contributor.authorDemirci, Emrah
dc.date.accessioned2026-02-08T15:15:09Z
dc.date.available2026-02-08T15:15:09Z
dc.date.issued2025
dc.departmentBursa Teknik Üniversitesi
dc.description.abstractMechanical properties of nanocomposites are directly affected by their microstructures. Orientation distribution of nano-reinforcements, one of the critical microstructural parameters, is, therefore, of great importance. However, methods to quantify their orientation are limited. Many studies employ transmission electron microscopy (TEM) for qualitative characterisation of orientation distribution of graphene nanoplatelets (GNPs) in nanocomposites. However, there is no report in the literature that does it quantitatively based on TEM micrographs. In this study, a method for the use of TEM in quantitative characterisation of the orientation distribution of GNPs in nanocomposites is suggested. Materials used for this purpose were sodium alginate nanocomposites reinforced with GNPs. In order to assess the effectiveness of the suggested method, finite-element (FE) models of representative volume elements (RVEs) of the nanocomposites were developed based on the GNPs' orientation distribution data. Elastic-range tensile tests of these composites were simulated with the RVEs. The simulation results were compared with the data from experiments reported in our previous study. A strong correlation between the obtained results of numerical simulations and the experimental data was observed. Young's moduli of the nanocomposites, calculated with the simulations, were slightly higher than those from the experiments. A discrepancy of less than 4 % in the Young's moduli can be attributed to other microstructural parameters such as spatial distribution nonuniformity, wrinkling and dimensional variation of the GNPs, which were not taken into account in the FE models. Some micromechanical models were also implemented in order to assess their capability to predict the effect of GNP orientation distributions on stiffness of the nanocomposites. The Krenchel orientation factors were incorporated into the models for this purpose. This study shows that the quantitative characterisation of orientation distribution of graphene in nanocomposites is achievable through TEM analyses with the suggested methodology and can be used to underpin analysis of their properties and performance.
dc.identifier.doi10.1016/j.compscitech.2025.111084
dc.identifier.issn0266-3538
dc.identifier.issn1879-1050
dc.identifier.scopus2-s2.0-85216303636
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1016/j.compscitech.2025.111084
dc.identifier.urihttps://hdl.handle.net/20.500.12885/5641
dc.identifier.volume262
dc.identifier.wosWOS:001420759600001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier Sci Ltd
dc.relation.ispartofComposites Science and Technology
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzWOS_KA_20260207
dc.subjectGraphene
dc.subjectNanocomposites
dc.subjectMechanical behavior
dc.subjectTransmission electron microscopy
dc.subjectSpatial orientation
dc.subjectFinite-element modelling
dc.titleQuantitative analysis of orientation distribution of graphene platelets in nanocomposites using TEM
dc.typeArticle

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