Materials Literature
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Abstract Partly as a result of the high solution viscosity of bacterial cellulose, carboxymethylcellulose (CMC) derived from this material exhibits shear‐thinning and thixotropic properties. With suitable sample treatment, the CMC solution shows gel‐like rheology suggesting the presence of a three‐dimensional network.…
Methods employing continuum approximation in describing the deformation of layered materials possess a clear advantage over explicit models. However, the conventional implicit models based on the theory of anisotropic continua suffers from certain difficulties associated with interface slip and internal instabilities.…
Abstract The melting and crystallization behavior of Vectra tm B950, a random liquid crystalline copoly(ester amide), was studied by differential scanning calorimetry (DSC). Nonisothermal experiments showed the existence of some interesting and peculiar transition behavior, which may depend on the crystallization cond…
Two strong peaks were observed in the electron energy loss spectra of polycrystalline AMoO3 (A=Sr and Ba) perovskites with metallic conductivities. One, observed at 1.7 eV, was attributed to plasmon loss originating from conduction electrons. This explains the reddish color observed. The other, located at ∼5 eV, was a…
Organic matter in Urbic Anthrosols often contains chemically and biologically inert organic carbon. This material, called black carbon (BC), originates from municipal wastes, coal‐mine deposits and/or fly ash. This black carbon needs to be differentiated from the other soil organic substances because of its very diffe…
It has been demonstrated that the “polycondensation” of poly(tetrahydrofuran)-diols with dibutlytin dimethoxide in bulk yields tin-containing poly(THF) macrocycles and not linear polycondensates. These macrocycles were characterized by 1H and 119Sn NMR spectroscopy, by elemental analyses, viscosity measurements and ma…
Article Surface Tension and Surface Segregation of Liquid Cobalt-Iron and Cobalt-Copper Alloys was published on May 1, 1999 in the journal International Journal of Materials Research (volume 90, issue 5).
Biopolímeros como polissacarídeos e proteínas, têm despertado interesse recentemente, como matérias primas para embalagens comestíveis e/ou biodegradáveis. Os materiais a serem desenvolvidos devem possuir boas propriedades mecânicas e aparência, para proteger e apresentar o produto embalado. Este trabalho teve como ob…
Mechanization of glass manufacture had just begun in 1898 but was accelerating. Notable advances were soon to be made in all branches of the industry, many of them in the United States, and have continued to the present day. M. J. Owens occupies a unique position as the inventor of the first successful fully automatic…
The crystallization kinetics of a glass based on one type of mica, NaMg 3 AlSi 3 O 10 F 2 , with the addition of a nucleating agent, TiO 2 , has been studied using differential thermal analysis (DTA) under both isothermal and nonisothermal conditions. Two distinct crystallization exotherms in the DTA curve are observe…
Epitaxial growth of PbSe/BaF2/CaF2 heterostructures was carried out by molecular beam epitaxy (MBE) on Si(111) wafers. Successful transfer of 3-μm-thick PbSe epilayers was accomplished by bonding the MBE-grown samples face down to polished copper plates followed by the removal of the silicon substrate by dissolving th…
A detailed comparison of the structures of aspartate aminotransferase, alanine race-mase, the beta subunit of tryptophan synthase, D-amino acid aminotransferase and glycogen phosphorylase has revealed more extensive structural similarities among pyridoxal phosphate (PLP)-binding domains in these enzymes than was obser…
The thermal behaviour of CdS nanoparticles and especially of their surfaces has been investigated by high resolution photoelectron spectroscopy. Different annealing characteristics were observed for particles of different sizes. From the changes of surface core-level shifts in the S 2p and Cd 3d5/2 spectra we derive t…
At 1050 ?C boron combines with sodium forming a boride of formerly unknown composition and crystal structure. The investigation of the homogeneous, monophasic, and crystalline powder was performed using X-ray (23 ?C) and neutron (–271.5 ?C) diffraction methods. The structure solution led to an unusual arrangement of b…
We propose stratified volume diffractive optical elements as a new type of diffractive optical element that is capable of functioning as a high-efficiency grating in applications with requirements not suited to traditional holographic or diffractive optical techniques. In this approach, diffractive optical fabrication…
Neutron diffraction and magnetic susceptibility experiments were performed on single crystals of the doped Mott-Hubbard insulator ${\mathrm{LaTiO}}_{3+\ensuremath{\delta}}.$ The magnetic properties of the three-dimensional correlated electron system were investigated upon hole doping. The size of the ordered moment of…
Abstract Thin films including Methylene Blue (MB) have been prepared. They were dip-coated using the sol–gel reaction of tetraethyl orthosilicate (TEOS). The absorption spectra of the individual thin films have been observed as a function of time after preparation of the films. The relative contributions of the monome…
The oxidation stability of low density polyethylene to UV light has been studied in the presence of various types of antioxidants (hindered phenols, HALS and synthetic N-alkylamines). A chemiluminescence procedure has been applied. Kinetic parameters of oxidation are obtained from isothermal measurements at 180 °C. Th…
The main aim of this contribution is characterization of fabric porosity by the light transmission and comparison of this characteristic with air permeability and idealized geometrical structure of selected weaves. For characterization of air permeability the classical apparatus has been used. The transmission of ligh…
Measurements of magnetization and magnetoresistance have been made for crystals of ${\mathrm{La}}_{0.5}{\mathrm{Sr}}_{1.5}{\mathrm{MnO}}_{4}$ with use of pulsed magnetic fields up to 40 T. Application of high magnetic field causes metamagnetic transitions below 217 K and concomitantly the colossal magnetoresistance ef…