Materials Literature
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The electromechanical performance characteristics of 0.7Pb(Mg1/3Nb2/3)O3–0.3PbTiO3 ceramics and 〈001〉-oriented crystals have been investigated under uniaxial stress (σ). The results demonstrate that 〈001〉-oriented crystals have an electromechanical coupling coefficient of ∼0.9 for σ less than 4×107 N/m2. The results a…
Environmentally stable conjugated polymer–organo-clay nanocomposites have been used to fabricate LEDs. The organo-clay containing devices are shown to exhibit improved external quantum efficiency compared to pure polymer devices (enhanced by a factor of ca. 100). The composite materials also showed an enhanced photolu…
This paper describes the concept, design, fabrication and control of a shape memory alloy (SMA) wire actuator for tracking helicopter rotor blades while in-flight. A NACA 0012 wing section that has a 12 in chord and span was constructed with a trailing-edge tab with a 4 in span and a 2.4 in chord. A shape memory alloy…
Highly crystalline cellulose III I samples were prepared by subjecting oriented films consisting of an assembly of Cladophora cellulose microcrystals to supercritical ammonia. Diffraction data recorded on these specimens indicated that the crystals of cellulose III I could be fully described with a one-chain unit cell…
The crystal structure of monoclinic KGd(WO 4 ) 2 (KGW) has been refined at room temperature by using single-crystal X-ray diffraction data. The unit-cell parameters are a = 10.652 (4), b = 10.374 (6), c = 7.582 (2) Å, β = 130.80 (2)°, with Z = 4, in space group C 2/ c . The linear thermal expansion tensor has been det…
Data storage is an integral part of today’s society and is something that we tend to take for granted. In this article, the history of one of the most important magnetic information storage materials—maghemite—is presented from a unique perspective. As the story of this material unfolds, insight into the generally acc…
Abstract Biocomposites were produced using polycaprolactone and starch as matrix, and sisal fibers as reinforcement. The matrix is a biodegradable commercial product called MaterBi‐Z, which is based on a polycaprolactone and starch system. The relationship between processing conditions and properties is reported. An a…
Phthalocyanines (Pc) and related macrocycles in combination with organic or inorganic macromolecules are reviewed. From the structural point of view, the macrocyclic compounds in macromolecular phases are subdivided into five types. Syntheses are described in detail, and characteristic experimental procedures are give…
Two-component polymer brushes (polystyrene and poly(2-vinylpyridine)) were synthesized by grafting from the surface of Si-wafers. The brushes are sensitive to the surrounding medium, and their morphology and composition of the top of a brush can be switched upon exposure to different solvents. Thus surface energetic s…
Thirty-one proteins and viruses that we knew from our own experience could be crystallized, or had been reported to have been crystallized by others, were investigated. In this experiment, each protein or virus was subjected to a crystallization screen of 12 different salts, each titrated to pH 7.2 beforehand, at conc…
In the bivalve mollusc Mytilus edulis shell thickening occurs from the extrapallial (EP) fluid wherein secreted shell matrix macromolecules are thought to self-assemble into a framework that regulates the growth of CaCO(3) crystals, which eventually constitute approximately 95% of the mature shell. Herein is the initi…
The nanoscale mechanism of retention behavior in SrBi2Ta2O9 (SBT) thin films has been investigated by means of piezoresponse scanning force microscopy. It has been found that SBT films with Pt electrodes (SBT/Pt) exhibit a strong dependence of retention characteristics upon domain polarity: positive domains with the p…
Oxygen reduction reaction (ORR) kinetics were investigated on synthesized Al-Cu, Al-Cu-Mg, and Al-Cu-Fe-Mn intermetallic phases and compared to AA2024-T3 (UNS A92024), as well as high-purity Al, Cu, and Au. These tests were conducted in 0.1 M sodium sulfate (Na2SO4) with and without either 0.005 M sodium chloride (NaC…
A new potentially catalytic material has been developed by partial recrystallization of the porewall of MCM-41. Recrystallization is induced by impregnation of MCM-41 with tetrapropylammonium hydroxide followed by a hydrothermal treatment. This procedure resulted in the formation of small particles of approximately 3…
Silica molecular sieves with uniform pores on the borderline between micropore (diameter <2 nm) and mesopore (from 2 to 50 nm) ranges were synthesized by a novel method using judiciously chosen mixtures of short double-chain alkylammonium surfactants. These silicas were characterized using X-ray diffraction (XRD), the…
Self-interstitial atoms (SIAs) and SIA clusters are produced in displacement cascades during irradiation of a material with high-energy particles. The migration kinetics of such defects are a critical factor in controlling microstructure evolution and the ensuing changes in mechanical properties. In this study, extens…
Alumina templates are used to assist the deposition of highly ordered polycrystalline diamond nanocylinders (see Figure) and diamond-like carbon nanotubes. The growth of diamond is carried out by microwave plasma-assisted CVD, using acetone as the carbon source. The dimensions of the nanofibers are easily controllable…
We report the first results of ultra-fast enhanced light emission from gold– and silver–dendrimer nanocomposites. There is a fast (70 fs) fluorescence decay component associated with the metal nanocomposites. Anisotropy measurements show that this fast component is depolarized. The enhanced emission is suggestively du…
Biomolecular Bombyx mori silk-based multiblock copolymers of poly(ethylene oxide)(PEO) and GlyAlaGlyAla prepared by step-growth polymerization based on a modular chemical method have been found to self-assemble into nanostructures. Solid-state 13 C NMR, solid-state FTIR, and powder X-ray diffraction provided evidence…
Abstract The bulk isothermal crystallization kinetics of poly(trimethylene terephthalate) (PTT) was studied using a differential scanning calorimeter. Avrami's theory was used to analyze the data. Based on crystallinity growth rate, Avrami rate constant, K, and crystallization half‐time, PTT's crystallization rate is…