Materials Literature
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ABSTRACT Like most metazoan biomineralisations, the brachiopod shell is the end product of a biologically controlled calcification process. The main agent of the control is the extracellular matrix, which is secreted by the outer mantle epithelium. This matrix mediates the calcification process by allowing crystal nuc…
Carbon nanocage, a three dimensional cage type mesoporous carbon with very high surface area and pore volume, has been functionalized with carboxyl groups for the first time via a simple oxidation using ammonium persulfate solution (APS). The carboxyl groups functionalized carbon nanocage materials have been unambiguo…
Basic issues involving movement of conductive constituents and microstructural evolution from high current density in single phase materials are well documented. Recently, electromigration of conductive constituents in multiphase materials has gained attention due to the necessity of employing such alloys for intercon…
Examination of the complexing citric acid/EDTA synthesis of (Ba 0.5 Sr 0.5 )(Co 0.8 Fe 0.2 )O 3−δ is presented by in situ X‐ray diffraction and transmission electron microscopy, which elucidate all intermediate phases and the formation of the perovskite structure for the first time.
It is shown that in a two-dimensional system with linear dispersion a resonance is present in the vicinity of the Dirac point, when the impurity perturbation magnitude exceeds the bandwidth. The corresponding spectrum rearrangement, which follows at a certain critical impurity concentration, results in a square-root d…
Ferroelectric BaTiO3 phase of a Pnma orthorhombic crystal structure is synthesized from a chemical method using a polymer complex of Ba2+ and Ti4+ with polyvinyl alcohol (PVA). After burning out the polymer at temperature as high as 550 °C in air for 2 h results in an average 15 nm crystallite BaTiO3 size, with lattic…
A series of intercalated and exfoliated nanocomposites montmorillonite-ulvan was prepared. Ulvan, extracted from the green algae, is a water-soluble polysaccharide biopolymer. Depending on the drying process, air or freeze drying, ulvan were inserted in the interlayer space or adsorbed on the both sides of inorganic l…
A synergetic effect and catalytic activity in allylbenzene isomerization have been found for the Au–Ni/SiO2 system prepared by metal-vapour synthesis.
A microwave/conventional hybrid furnace has been used to anneal virtually fully dense zinc oxide ceramics under pure conventional and a microwave/conventional hybrid heating regime with a view to obtaining evidence for the “microwave effect” during the resulting grain growth. In each case it was ensured that each samp…
Conducting polymers are materials which combine the electronic characteristics of metals with the engineering properties of polymers. Poly(pyrrole) (PPy), poly(thiophene) (PTh) and poly(aniline) (PAn) are common examples of conducting polymers and can be produced either chemically or electrochemically from their respe…
Carbon nanotubes (CNTs) have extraordinary properties that make them promising candidates for a wide variety of potential biomedical applications, including new therapeutics, drug delivery systems and diagnostics. Because of their enormous commercial potential across industries, a classic patent landgrab is underway a…
The present work compares three different methodologies reported in the literature for the iron loss prediction in magnetic lamination supplied with PWM waveform. The target is the comparison of these methods from an engineering point of view. In particular, the authors analyze the practical use of the methods, such a…
downturn hit other parts of Asia, pressuring Japanese banks to tighten the credit they had been giving local distributors to purchase large quantities of South Sea and black pearls. As a result, large pearl farms throughout the Pacific region broke out of their role as "contract" producers for the Japanese firms and b…
A novel liquid crystal oligomer, 4‐(4‐cyanophenyl)phenyl 4‐octyloxy‐2‐{7‐{4‐[4‐(4‐hexylphenyl)‐2,3‐difluorophenyl]phenyloxy}heptanoyloxy}benzoate, was prepared and found to exhibit a wide temperature range of a nematic phase in spite of being far from a rod‐like structure. Furthermore, the compound induced blue phases…
A new class of cholesterol‐based non‐symmetric dimers have been synthesized and characterized. They comprise O‐alkylated cinnamic acid and pro‐mesogenic cholesterol segments interlinked covalently through a methylene spacer varying in its length and parity. All the dimers and some of the key precursors have been studi…
A nanofibrous sensor for ammonia gas is fabricated by electrospinning the composite of poly(diphenylamine) (PDPA) with poly(methyl methacrylate) (PMMA) onto the patterned interdigit electrode. The composite electrospun membrane shows interconnected fibrous morphology. Functional groups in PDPA and the high active surf…
An unsymmetric, peripherally octasubstituted phthalocyanine (Pc) 1, which contains a combination of dipyrido[3,2-f:2',3'-h] quinoxaline and 3,5-di-tert-butylphenoxy substituents, has been obtained via a statistical condensation reaction of two corresponding phthalonitriles. Synthetic procedures for the selective metal…
We investigated the structure and field-emission property of tungsten oxide nanowires synthesized under different oxidation degrees. We annealed a sputtered tungsten film at 800 °C, controlling the ratio of hydrogen to oxygen (RHO) using Ar/H 2 (97/3%) gas in a vacuum furnace. The resulting differences in shape, numbe…
Mycobacterium tuberculosis is the etiological agent for tuberculosis in humans. The studies related to survival of this pathogen in the human host and development of drugs against reveal that the organism uses a complex physiology to adapt to the host environment. Many studies were targeted to key enzymes that allow t…
Abstract Different phenomenological approximations for the analysis of the primary X-ray extinction due to homogeneously and randomly distributed dislocations have been discussed. It has been shown that the primary extinction coefficient calculated according to the models proposed by Ivanov et al. and Olekhnovich is i…