Mechanical Properties of Two-dimensional Nano-composites and Oxides

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dc.contributor.advisorLou, Junen_US
dc.contributor.advisorHan, Yimoen_US
dc.creatorShin, Bongkien_US
dc.date.accessioned2025-05-30T21:10:50Zen_US
dc.date.created2025-05en_US
dc.date.issued2025-04-25en_US
dc.date.submittedMay 2025en_US
dc.date.updated2025-05-30T21:10:50Zen_US
dc.description.abstractTwo-dimensional (2D) materials have attracted enormous interests owing to their extraordinary properties due to their atomic-level thickness and robust in- plane atomic bonding, positioning them as promising materials for advanced technological applications across electronics, photonics, sensing, energy storage, and structural composites. However, their practical applications have been hindered by intrinsic brittleness, susceptibility to defects, and relatively low fracture toughness. This thesis systematically investigates intrinsic and extrinsic toughening mechanisms, along with anisotropic fracture properties, in selected novel 2D materials and composites to enhance their mechanical robustness and reliability. The intrinsic toughening mechanisms are explored through detailed studies on monolayer amorphous carbon (MAC) nanocomposites, investigating how structural heterogeneities (crystalline and amorphous domain) influence fracture resistance. In-situ scanning electron microscopy (SEM) tensile testing with molecular dynamics (MD) simulations provides comprehensive insights into fracture processes and toughening behaviors. Extrinsic toughening strategies are investigated through two-dimensional covalent organic framework sandwich structures, demonstrating significant improvements in fracture toughness. Additionally, anisotropic fracture behavior is studied in monolayer titania nanosheets, emphasizing the role of crystallographic orientation and defect distributions in determining mechanical performance. Overall, this thesis provides fundamental insights into fracture mechanics and toughening mechanisms in 2D materials, offering practical strategies for designing mechanically robust and reliable nanocomposite systems. The findings not only advance the fundamental understanding of 2D material behavior but also expand their potential applications in next-generation engineering technologies.en_US
dc.embargo.lift2027-05-01en_US
dc.embargo.terms2027-05-01en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.urihttps://hdl.handle.net/1911/118533en_US
dc.language.isoenen_US
dc.subject2D nanomechanicsen_US
dc.subject2D nanocompositesen_US
dc.subject2D oxidesen_US
dc.subjectfracture toughnessen_US
dc.subjectintrinsic tougheningen_US
dc.subjectextrinsic tougheningen_US
dc.subjectanisotropic mechanical behavioren_US
dc.titleMechanical Properties of Two-dimensional Nano-composites and Oxidesen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentMaterials Science and NanoEngineeringen_US
thesis.degree.disciplineMaterials Science & NanoEngen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US
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