Materials Literature
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Using the Lagrangian formalism, coupled equations are derived that describe radial and translational motions of an arbitrary bubble in a three-dimensional cluster subject to an ultrasound field. The obtained equations incorporate the nonlinear coupling of the volume and the translational modes of bubbles as well as in…
This paper reports on an experimental investigation of the effects of garment fit on clothing thermal insulation and moisture vapor resistance, both of which increase with the thickness of the air gap between the garment and the body when the air gap is small. The rate of increase gradually decreases as the air gap be…
Abstract Dioctahedral smectite samples of a wide range of compositions (beidellites, montmorillonites, nontronites, Fe-rich montmorillonites and Al-rich nontronites) were studied by infrared (IR) spectroscopy. A special sample-preparation technique was used to eliminate the contribution of molecular water. The OH-stre…
A new, versatile methodology for functionalization of single-walled carbon nanotubes (SWNTs), using 1,3-dipolar cycloaddition of nitrile imines to the sidewalls of SWNTs has been used to synthesize two soluble, photoactive single walled carbon nanotubes containing n -pentyl esters at the tips and 2,5-diarylpyrazoline…
Nanostructured β‐SiC, with crystallite size in the range of 5–20 nm in agglomerates of 50–150 nm, was formed by reactive high‐energy ball milling and consolidated to a relative density of 98% by sintering at 1700°C without the use of additives. X‐ray line broadening analysis gave a crystallite size of 25 nm, while tra…
Novel devices for converting a linear polarization state to radial or azimuthal polarization states are realized by use of space-variant inhomogeneous media on a subwavelength scale. The two designs presented use form birefringence to locally transform the polarization state. The devices are fabricated in a GaAs subst…
Biocomposites were produced using polycaprolactone (PCL) and starch as the matrix, and washed and treated sisal fibres as reinforcement. The matrix consists of a biodegradable product commercially known as MaterBi-Z®, which is based on a PCL, starch and additive. Alkaline and acetylation treatments were performed on t…
Abstract Polymer blends, such as those resulting from recycling postconsumer plastics, often have poor mechanical properties. Microcellular foams have been shown to have the potential to improve properties, and permit higher‐value uses of mixed polymer streams. In this study, the effects of microcellular batch process…
Silicone rubber samples having various concentrations and mean particle sizes of either alumina tri-hydrate or silica filters, prepared by room temperature and heat cured under pressure (hot pressed), are tested for erosion resistance in the ASTM D2303 inclined plane tracking and erosion test. Their corresponding ther…
We report a physical mechanism responsible for initiating a vacuum breakdown process of a single carbon nanotube (CNT) during field emission. A quasidynamic method has been developed to simulate the breakdown process and calculate the critical field, critical emission current density and critical temperature beyond wh…
Abstract The green emission of poly(9,9′′‐dioctylfluorenyl‐2,7′′‐diyl), end‐capped by polyhedral oligomeric silsequioxanes, (PFO‐POSS) has been investigated by photoluminescence (PL) and photoexcitation (PE), gel permeation chromatography (GPC), and transmission Fourier transform infrared (FTIR) spectroscopy. The gree…
We investigated the optical properties of epitaxial n-type ZnO films grown on lattice-matched ScAlMgO4 substrates. As the Ga doping concentration increased up to 6x10(20) cm(-3), the absorption edge showed a systematic blueshift, consistent with the Burstein-Moss effect. A bright near-band-edge photoluminescence (PL)…
The continued evolution of targeted liposomal therapeutics has resulted in new agents with remarkable antitumour efficacy and relatively mild toxicity profiles. A careful selection of the ligand is necessary to reduce immunogenicity, retain extended circulation lifetimes, target tumour-specific cell surface epitopes,…
We spatially resolve the infrared light emission from ambipolar carbon-nanotube field-effect transistors with long-channel lengths. Electrons and holes are injected from opposite contacts into a single nanotube molecule. The ambipolar domain, where electron and hole currents overlap, forms a microscopic light emitter…
Rheological properties of xerographic liquid inks of different concentrations of solid particles have been tested. Generally we have found that viscosity decreases with increasing shear rate, i.e. the system is pseudoplastic as corresponds to the break down of aggregated particles by the applied shear. The viscosity o…
The performance of tests with elastic liquids at high shear rates is cumbersome due to viscous dissipation heating, high normal forces, and - above all - edge fracture. This paper shows how such measurements can be improved and simplified over the conventional cone-plate technique by using a partitioned plate. For a p…
Abstract Frequency sweep experiments were performed on poly(vinyl chloride) (PVC) and acrylonitrile butadiene rubber (NBR) as well as their miscible blends PVC/NBR (70/30), PVC/NBR (50/50), and PVC/NBR (30/70) in oscillatory shear. The samples were prepared by mechanical blending at 160˚C. In order to investigate the…