Materials Literature
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Improvements of the sensitivity of piezoelectric microphones based on charged cellular polymer films are reported. The improvements are achieved by (1) an increase of the piezoelectric d33-coefficient of the cellular polypropylene films by pressure expansion and (2) stacking of the films. Microphones consisting of a s…
ABSTRACT: The tensile properties, water vapor permeability, oxygen permeability at different relative humidities (RH), and water solubility of edible films made of high‐amylose rice starch (RS) or pea starch (PS) were measured and compared with the most commonly used edible films. Photomicrography of starch films show…
Abstract Ab initio structure determination using direct-space methods, although relying on an essentially brute-force approach, can be greatly improved through smarter algorithms. The most basic improvement involves the use of prior information to reduce the number of configurations evaluated to find the structure sol…
The magnetic study of a trinuclear Cu-Gd-Cu complex confirms that such basic units self-assemble to yield a high spin species. A nice fit of the magnetic data is obtained for an infinite chain of tetranuclear Gd(2)Cu(2) motifs linked through the Gd ions located at the opposite vertexes of the tetranuclear motifs accor…
Layer-by-Layer (LbL) stepwise self-assembly of the polyelectrolytes poly(allylamine hydrochloride) and poly(styrenesulfonate) was used to create a macromolecular nanoshell around drug nanoparticles (approximately 150 nm in diameter). Dexamethasone, a steroid often used in conjugation with chemotherapy, was chosen as a…
CuAlO 2 exhibits a unique defect structure that is dependent on the synthesis route. High-temperature solid-state and low-temperature hydrothermal techniques are compared to illustrate how cation off-stoichiometry affects the electrical properties of CuAlO 2 . A defect complex of Al on a Cu-site stabilized by two boun…
There has been a surge of interest in polymer–clay nanocomposites over the past decade. This review surveys these new materials with emphasis on the debate surrounding interaction mechanisms and the behaviour of intercalated polymer in clay galleries. Swelling properties, high cation exchange capacities, high aspect r…
Mesostructured hollow spheres of graphitic N-doped carbon (CNx) materials may be nanocast from solid core mesoporous silica SBA-15 spheres via a chemical vapor deposition (CVD) route. The hollow spheres are generated when the SBA-15 silica/carbon composite obtained after CVD is subjected to silica etching in hydrofluo…
This work includes investigation on solubility enhancement of indomethacin (IND) in the presence of poly(amidoamine) (PAMAM) dendrimers and passive targeting of the PAMAM/IND complex so formed to the inflamed regions in an animal model. The complex formation was confirmed by infrared and (1)H nuclear magnetic resonanc…
Porphyrin nanotubes represent a new class of nanostructures for which the molecular building blocks can be altered to control their structural and functional properties. Nanotubes containing tin(IV) porphyrins are photocatalytically active and can reduce metal ions from aqueous solution. The metal is deposited selecti…
Homoepitaxial diamond layers doped with boron in the ${10}^{20}--{10}^{21}\text{ }\text{ }{\mathrm{c}\mathrm{m}}^{\ensuremath{-}3}$ range are shown to be type II superconductors with sharp transitions ($\ensuremath{\sim}0.2\text{ }\text{ }\mathrm{K}$) at temperatures increasing from 0 to 2.1 K with boron contents. The…
Fluorescent nanocrystal quantum dots (QDs) have the potential to be applied to bioimaging since QDs emit higher and far longer fluorescence than conventional organic probes. Here we show that QDs conjugated with signal peptide obey the order to transport the assigned organelle in living cells. We designed the supermol…
A viscosity function for highly-shear-thinning or yield-stress liquids such as pastes and slurries is proposed. This function is continuous and presents a low shear-rate viscosity plateau, followed by a sharp viscosity drop at a threshold shear stress value (yield stress), and a subsequent power-law region. The equati…
The present work examines microstructure, tensile properties and quality (porosity level) of two thixoformed products, namely an assembly of three cylindrical rods from which tensile samples were machined out, and a cup-shaped part. The material is an A356 aluminium alloy and the microstructural conditioning was carri…
This paper describes a complementary method for determining dielectric properties of granular materials using the Transmission/Reflection Method in order to estimate their moisture content. The Newton's Complex Interactive Method is used here as a numerical tool to calculate the complex permittivity of the plaster glu…
One of the most characteristic properties of clays is their "cation exchange capacity", otherwise known as their "exchange capacity ". The research reported in this article shows that for various reasons some natural and artificial pozzolans exhibit this property. Ion exchange is only partial in the latter however bec…
This paper presents an investigation into the performance of alkali-activated slag (AAS) mortar exposed to elevated temperatures. Sodium silicate, sodium hydroxide and a mix (waterglass) with a modulus (SiO2/Na20) of 1.5 were used as activators. The specimens were heated in an electric furnace up to 1000 ºC in steps o…