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Chapter and Conference Paper
Study of the Effect of Interface Enthalpy on Nanocomposite Viscoelasticity
Polymer Nanocomposites (PNC) are a fascinating category of material systems, in which nanoscopic fillers are found to induce remarkable improvements in the properties of the polymeric matrix.[1] This improveme...
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Chapter
Non-linear Field Grading Materials and Carbon Nanotube Nanocomposites with Controlled Conductivity
Coincident with many applications requiring dielectric materials is the need for filled polymers with tailored conductivity and non-linear resistivity as a function of electric field. For example, in cable ter...
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Article
Candidate mechanisms controlling the electrical characteristics of silica/XLPE nanodielectrics
The incorporation of silica nanoparticles into polyethylene has been shown to increase the breakdown strength significantly compared to composites with micron scale fillers. Additionally, the voltage endurance...
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Article
Polymer nanocomposites: A small part of the story
Polymer nanocomposites are polymer matrix composites in which the fillers are less than 100 nm in at least one dimension. These composites have exhibited extraordinarily interesting properties. A defining feat...
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Article
Equivalence between polymer nanocomposites and thin polymer films: Effect of processing conditions and molecular origins of observed behavior
Recently we established a quantitative equivalence in thermomechanical properties between polystyrene-silica nanocomposites and planar freestanding polystyrene thin films. This equivalence was quantified by dr...
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Article
Tunable friction behavior of oriented carbon nanotube films
Measured friction coefficients of carbon nanotubes vary widely from μ < 0.1–μ > 1.0 [1–6], while theoretical studies suggest intrinsically high friction coefficients, approaching unity [7]. Here we report that me...
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Article
Electrical behavior of low density polyethylene containing an inhomogeneous distribution of ZnO nanoparticles
ZnO nanoparticles were mixed with low density polyethylene (LDPE) to form nanocomposites. The distribution of ZnO filler particles was controlled by changing the mixing method, and the effects of controlled in...
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Article
Frictional anisotropy of oriented carbon nanotube surfaces
This report examines highly anisotropic tribological behavior of multi-walled nanotube films oriented in mutually orthogonal directions. The average values of coefficient of friction varied from extremely high...
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Article
Identification of the Dispersion Behavior of Surface Treated Nanoscale Powders
The stability of highly acidic metal oxide surface treatments on rutile titanium dioxide nanopowders (40 nm nominal particle size) is examined. Dispersions are characterized in terms of their sedimentation beh...
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Article
Time-dependent micromechanical behavior in graphite/epoxy composites under constant load at elevated temperatures
Time dependent deformation at the individual fiber level was investigated in graphite fiber/epoxy composites at elevated temperatures using micro Raman spectroscopy (MRS) and a time dependent shear-lag based s...
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Article
Phase stability of thermal barrier coatings made from 8 wt.% yttria stabilized zirconia: A technical note
In summary, the phase stability in plasma sprayed 8 wt.% PSZ coatings with a porous and cracked microstructure were studied for times of up to 10 000 h at temperatures of 982 °C, 1204 °C, and 1315 °C. The two ...
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Article
Retarded Cross-linking in ZnO-low-density Polyethylene Nanocomposites
ZnO nanoparticles were mixed with branched low-density polyethylene and were found to increase the resistance of the polymer to thermal degradation without changing other thermal properties. Submicron-size ZnO...
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Article
Residual Compression Stress Profile in High-Modulus Carbon Fiber Embedded in Isotactic Polypropylene by Micro-Raman Spectroscopy
Raman spectroscopy was used to investigate the compressive fragmentation process and the interface behavior in ultra high modulus (UHM) (750 GPa Modulus) pitch-based graphite/polypropylene composites upon cool...
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Article
Microstructure and Mechanical Properties of Thermally sprayed silica/nylon nanocomposites
High-velocity oxyfuel thermal spray processing was used to produce ceramic/polymer (silica/nylon) nanocomposite coatings. By optimizing spray parameters such as nozzle design, spray distance, oxygen-to-fuel ra...
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Article
Fibre interactions in two-dimensional composites by micro-Raman spectroscopy
In the study of fracture processes in composite materials, the interactions between broken and intact fibres are of critical importance. Indeed, the redistribution of stress from a failed fibre to its unfailed...
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Article
Characterization of inhomogeneous elastic deformation with x- ray diffraction
In standard engineering practice, the stress/strain responses of polycrystalline specimens are analyzed using models based on the equations of continuum mechanics. In general, these equa-tions implicitly assum...
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Article
Interphase behaviour in graphite-thermoplastic monofilament composites
The fatigue properties of continuous filament composites are dependent on the fibre-matrix interphase behaviour, specifically the ability of the interphase to transfer load durably from the matrix to the fibre...
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Article
Interphase behaviour in graphite-thermoplastic monofilament composites
The role of the fibre-matrix interphase in transferring load from the matrix to the fibre in graphite-thermoplastic composites is not well understood. The goal of this work was to alter the interphase of graph...
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Article
Interfacial studies on carbon/thermoplastic model composites using laser Raman spectroscopy
Interfacial studies were carried out on a model composite system consisting of a short carbon fibre embedded in a polycarbonate matrix. While the composite was being strained, the local strain along the fibre ...
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Article
Experimental determination of the strain transfer across a flexible intermediate layer in thin-film structures
