Materials Literature
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The synthesis of spherical BaTiO 3 particles was attempted by a new technique, the “gel–sol method,” at 45°C. The (Ba–Ti) gel used as a starting material was prepared by aging mixtures of titanyl acylate with a barium acetate aqueous solution ([glacial acetic acid (AcOH)]/[titanium isopropoxide (TIP)] = 4, [barium ace…
Abstract Polyethylene–clay nanocomposites were synthesized by in situ polymerization with 2,6‐bis[1‐(2,6‐diisopropylphenylimino)ethyl] pyridine iron(II) dichloride supported on a modified montmorillonite clay pretreated with methylaluminoxane (MAO). The catalysts and the obtained nanocomposites were examined with wide…
Solid-state thermolysis of a hexa-peri-hexabenzocoronene–cobalt complex (see diagram) yielded multiwalled carbon nanotubes (CNTs) in near-quantitative carbon-conversion yield. Ordered “bamboo-like” and straight CNTs were obtained under controlled heating procedures. Such a novel solid-state synthesis of CNTs has promi…
Biomaterals are often in contact with the body or body fluids, so interfacial phenomena, especially protein adsorption, control essential parameters, such as biocompatability and bioreactivity. In addition, optimization of biotechnology tools such as DNA/protein microarrays and microfluidic systems will also require a…
The physical mechanisms involved in electron irradiation of insulating specimens are investigated by combining some simple considerations of solid-state physics (trapping mechanisms of electrons and secondary electron emission) with basic equations of electrostatics. To facilitate the understanding of the involved mec…
Poly(3-hydroxybutyrate-co-3-hydroxyvalerate), poly(3HB-co-3HV), copolyesters with a variety of 3HV contents (ranging from 17 to 60 mol%) were produced by Alcaligenes sp. MT-16 grown on a medium containing glucose and levulinic acid in various ratios, and the effects of hydrophilicity and crystallinity on the degradabi…
Abstract Numerous applications, from molecular electronics to super‐strong composites, have been suggested for carbon nanotubes. Despite this promise, difficulty in assembling raw carbon nanotubes into functional structures is a deterrent for applications. In contrast, biological materials have evolved to self‐assembl…
Abstract This paper presents an overview of developments that have taken place in recent years in the genetic algorithm technique for structure solution from powder diffraction data. After a brief resumé, of the essential features of the genetic algorithm technique for structure solution, the paper highlights recent d…
Abstract Integration of biomaterials within the body is a longstanding problem in medicine. The lack of proper biomaterial integration within the body sacrifices artificial implant longevity and function. Materials such as hydrogels may be able to integrate with soft tissue; however, a challenge remains to improve tis…
A series of metal complexes of tetrakis-2,3-[5,6-di(2-pyridyl)pyrazino]porphyrazine, [Py(8)TPyzPzH(2)], having the general formula [Py(8)TPyzPzM].xH(2)O (M = Mg(II)(H(2)O), Mn(II), Co(II), Cu(II), Zn(II); x = 3-8) were synthesized by reaction of the free-base macrocycle with the appropriate metal acetate in pyridine o…
In this note, a single state integral friction model is first proposed, defining separately the Dahl, Stribeck, and microviscous effects. The model is based on an integral closed form solution of the Dahl model. A multistate integral friction model, accounting for the hysteresis behavior with non local memory, has bee…
Abstract A sono‐ and photochemical approach has been developed to incorporate highly dispersed gold nanoclusters into mesoporous TiO 2 films. The first step involves the sonication of a TiO 2 film immersed in a gold chloride solution. This effectively removes the air trapped in the porous film matrix and drives the go…
Porous polycarbonate (PC) membranes with pore diameters of either 400 or 100 nm were used as supports for the layer-by-layer deposition of peroxidase−poly(sodium 4-styrenesulfonate) complexes [(POD−PSS) c ] and oppositely charged poly(allylamine hydrochloride) (PAH) to prepare high-surface-area thin films for biocatal…
A tecnologia dos chamados Compósitos Termoplásticos com Madeira envolve conceitos de compatibilidade e processabilidade e apresenta grandes desafios tecnológicos para a formulação e estabilização da mistura. Devido à baixa estabilidade térmica da celulose, a grande maioria das resinas termoplásticas utilizadas na prep…
Nanocrystalline lanthanum oxyfluoride thin films were synthesized by chemical vapor deposition (CVD) using La(hfa)3⋅diglyme (hfa=1,1,1,5,5,5-hexafluoro-2,4-pentanedionate; diglyme=bis(2-metoxyethyl)ether) as precursor compound. The coatings were deposited on Si(100) and commercial silica slides in nitrogen+wet oxygen…
[reaction: see text] The macrocyclic cyclen conjugates 1-4 were synthesized with the aim of forming lanthanide ion-based macrocyclic conjugates possessing deep cavities, formed upon complexation to various lanthanide ions. These complexes all possess metal-bound water molecules, where the pKa of the water molecules de…
An overview is given of improvements in the reliability of X-ray photoelectron spectroscopy (XPS) measurements over the past three decades. Early inter-laboratory comparisons showed wide variations in measurements of peak energies and relative peak intensities for the same material. Procedures now exist for calibratio…
The one-pot, high temperature, catalytic synthesis of polyetherimides (PEIs) in molten benzoic acid was investigated. The synthesis was conducted using the AB monomers, 4-aminophenoxy phthalic acid (IIa) and 3-aminophenoxy phthalic acid (IIb). Both Homo and co-PEIs with different ratios of substituted AB IIa and IIb w…
The Abraham solvation parameter model is used to calculate the numerical values of the solute descriptors for 4-aminobenzoic acid from experimental solubilities in organic solvents. The mathematical correlations take the form of where C S and C W refer to the solute solubility in the organic solvent and water, respect…
A nanoscaled Ba 0.5 Sr 0.5 TiO 3 (BST) powder was successfully synthesized using a modified hydrothermal process at a low temperature ( ). By dissolving Ba(OH) 2 ·8H 2 O and Sr(OH) 2 ·8H 2 O in deionized water as a base solution, nanocrystalline BST powder can be obtained by mixing an ethanol solution of tetrabutyl ti…