Materials Literature
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Poly(ethylene glycol) (PEG)-grafted polyaniline (PANi) copolymers were prepared by incorporating a chlorine end-capped methoxy PEG (mPEGCl) of molecular weight of about 2000 onto the leucoemeraldine form of PANi via N-alkylation. The microstructures and compositions of the mPEG-grafted PANi (mPEG- g -PANi) copolymers…
The series of alloys (GdxTb5−x)Si4 (x=0,2.5,3,3.5,4,4.5,5) and (GdxPr5−x)Si4 (x=4,4.25,4.5) have been prepared. Their room temperature crystal structure has been established, and dc magnetization and ac magnetic susceptibility have been measured in the temperature range from 4.2 to 550 K and in dc magnetic fields up t…
Iron-dependent regulators are primary transcriptional regulators of virulence factors and iron scavenging systems that are important for infection by several bacterial pathogens. Here we present the 2.0-A crystal structure of the wild type iron-dependent regulator from Mycobacterium tuberculosis in its fully active ho…
Macroporous materials with void sizes above 200 nm have interesting optical properties in the visible part of the spectrum. Here, a strategy is presented for producing large-area thin films of macroporous titania containing interconnected and close-packed pores (see Figure). Since the pores are highly ordered they pos…
Throughout its history, the study of ferroelectricity has been closely linked with device applications. The discovery of the first ferroelectric was made during studies of Rochelle salt which had excited a great deal of interest since it showed the largest piezoelectric effect known at the time. During the ups and dow…
The grain phase has a significant influence on the extent and mechanism of attack of low‐cement castables with similar bond systems in a crucible corrosion test. The general corrosion mechanism, as determined by post mortem scanning electron microscopic examination of corroded samples and thermodynamic calculations fo…
The optical properties of lead sulfide semiconducting nanoparticulate thin films with pancake-like structures are controlled by the lowest dimension of the particles, which is a consequence of 1D quantum confinement. Optical absorption and photoluminescence spectra of the nanoparticles (see Figure) reveal that their b…
The crystal structure of glucose dehydrogenase (GlcDH) from Bacillus megaterium IWG3 has been determined to an R-factor of 17.9% at 1.7 A resolution. The enzyme consists of four identical subunits, which are similar to those of other short-chain reductases/dehydrogenases (SDRs) in their overall folding and subunit arc…
Related Titles. Series Editora s Foreword. Chapter 1. Introduction. Chapter 2. Industrial Wear Problems. Chapter 3. Wear Tests to Simulate Practical Conditions. Chapter 4. A Guide to Wear Test Selection. Chapter 5. A Guide to the Examinination of the Worn Surfaces. Chapter 6. A Summary of the Approach to Wear Testing.…
Several DNA regions containing genes involved in poly-beta-hydroxybutyrate (PHB) biosynthesis and degradation and also in fatty acid degradation were identified from genomic sequence data and have been characterized in the serine cycle facultative methylotroph Methylobacterium extorquens AM1. Genes involved in PHB bio…
Abstract This work is concerned with the preparation and characterization of composite materials prepared by compression molding of a mixture of aluminum flakes and nylon 6 powder. The electrical conductivity, density, hardness and morphology of composites were investigated. The electrical conductivity of the composit…
Abstract Adsorption of the +4 charged cationic porphyrins onto an artificially synthesized smectite was studied. Porphyrin molecules adsorb on the clay sheet with high density to neutralize all the minus charges of the clay surface without aggregation by a novel method of a size-matching of distances between the charg…
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…