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Research on internal three-dimensional (3D) strain evolution of a failure process was conducted on a short carbon fiber-reinforced composite through high-resolution (0.33 μm/pixel) in situ synchrotron radiation X-ray computed tomography. Material microstructure and strain value were analyzed simultaneously in 3D for the first time. The distribution of strain fields is nonuniform under load sequences...
Graphene quantum dots (GQDs) with unique and tunable physical properties have been the focus of considerable attention because of their potential for electronic and photonic applications. In this work, the electronic polarizability and second hyperpolarizability of hexagonal GQDs were investigated using density functional theory. The effects of size, substituent, and incident frequency of hexagonal...
Carbon materials show promising application on energy storage due to high specific area, hierarchical porous structure and high electrical conductivity. Here mesoporous few-layer carbon (1–4 layer) with high specific surface area, unique nanoporous structure and good electron conductivity is synthesized via facile magnesium xerogels combined with chemical vapor deposition. This carbon material shows...
Free-standing, intergrown and covalently-bonded structures of three-dimensional (3D) graphene may have great advantages in electric and thermal transport properties for energy applications, but the desired symmetry and periodicity are rather hard to design and produce. Here we use an organic-inorganic template to grow an inverse.opal graphene structure by chemical vapor deposition. The symmetry-controlling...
Plasmonic gold nanoparticles (AuNP) with controllable dimensions have been fabricated in situ on graphene at moderately elevated temperature for high sensitivity surface enhanced Raman spectroscopy (SERS) of Rhodamine 6G (R6G) dye molecules. Significantly enhanced Raman signature of R6G dyes were observed on AuNP/graphene substrates as compared to the case without graphene with an improvement factor...
In contrast with traditional methods of observation, synchrotron radiation X-ray computed tomography (SR-CT) is an advanced technique that allows direct three-dimensional (3D) and non-destructive observation of microstructures in materials. High-resolution in situ observations (0.7μm/pixel) of fractures in short carbon fiber/epoxy composites are achieved using the SR-CT technique, and the mechanical...
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