Materials Literature
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Soluble cellulose intermediates are converted into carboxymethyl cellulose (CMC) with a high degree of substitution (DSCMC) of up to 2.2 by removing the solubilizing ester groups in an one-step synthesis in dimethylsulfoxide (DMSO) with suspended solid NaOH powder as a base and monochloroacetate within 4 hours at 70°C…
In the presence of a nonuniform distribution of spin interactions in ferromagnetic perovskite materials, thermally activated magnetic domains appear. These domains are different from ordinary static ferromagnetic domains, rather their structures depend on temperature, magnetic field, and details of the distribution of…
Abstract Copolyesters of poly(ethylene terephthalate) (PET) with a liquid crystalline polymer (LCP), SBH 1:1:2, have been synthesized by the polycondensation, carried out in the melt at temperatures up to 300°C of sebacic acid (S), 4,4′‐dihydroxybiphenyl (B), and 4‐hydroxybenzoic acid (H) in the presence of PET. The P…
Ferroelectric liquid crystals with high enough spontaneous polarization (Ps > 50nC/cm2) exibit a special periodic structure which forms after switching off a moderate electric field. One of the most important features of this new structure is the existence of inclined smectic layers with opposite signs of the inclinat…
The response of thermoluminescent dosimeters to electron irradiations depends on the radiation dose, mean electron energy at the position of the dosimeter in phantom, and the size of the dosimeter. In this paper the semi-empirical expression proposed by Holt et al. [Phys. Med. Biol. 20, 559-570 (1975)] is combined wit…
Abstract Electrochemical properties of the titled complex in dichloromethane (DCM) solutions have been investigated by cyclic and rotating-disk-electrode voltammetry. Two successive reversible one-electron reduction waves (E1/2 = −0.23 and −0.65 V vs. ferrocene/ferricinium+, respectively) and one irreversible oxidatio…
This work studies the behavior of low shrinkage PET fibers during free-ends thermal annealing. The interest in this type of sample stems from the fact that it possesses an interesting structure characterized by the presence of crystalline and amorphous domains both in a highly extended and oriented state. Furthermore,…
Because the structure and the chemical composition of the interface can have a large effect on the adhesion properties of polymeric materials to metallic surfaces, many investigations have concentrated on the study of the interphase region. However, the complexity of the materials often leads to the use of model compo…
Using a supermagnetron plasma apparatus, electrically conductive amorphous hydrogenated carbon (a-C:H) films were formed at wafer temperatures below 60 °C. CH4/N2 mixed gas was introduced into the discharge chamber and nitrogen-doped a-C:H films were formed on thermally oxidized Si wafers. A high electrical conductivi…
A unified numerical approach based on the finite-element method is described for the analysis of anisotropic dielectric grating diffraction. Both the TE and TM wave incidences are treated. The finite-element method is used for the region corresponding to one period of the grating, and analytical relations and periodic…
An integral formulation for the analysis of electromagnetic fields distribution in systems with bodies in motion is presented. This formulation is based on the subdivision of conductive and ferromagnetic regions in elementary volumes in which a uniform distribution of current density J and magnetization M is assumed.…
Mn–Zn ferrite ceramics were prepared through the ceramic method starting from metal oxides. The ceramics’ microstructural and electromagnetic properties were then evaluated. It was found that sintering density and ferrite grain size depend on both the sintering temperature and the kinds of the raw materials used. The…
The in vitro degradation characteristics of poly(anhydride-imides) containing pyromellitylimidoalanine, with either 1,6-bis(carboxyphenoxy)hexane (CPH) or sebacic acid (SA) were assessed. The copolymers contained up to 50 mol % of the imide monomer, pyromellitylimidoalanine (PMA-ala). Degradation was pH sensitive, bei…
In this article, the adsorption behavior and the surface redox reactivity among small molecules including N2O, O2, H2O and HCOOH on TiO2(110) surfaces are compared. New measurements of the interaction of HCOOH with defect-free and defective TiO2(110) surfaces and initial results from N2O adsorption on defects are comb…
The effect of low oxygen partial pressure during sintering on the power loss of high-frequency power supplies based on MnZn ferrites was studied. The investigation revealed that a lower concentration of oxygen in the sintering atmosphere modifies the ferrite microstructure and its magnetic properties. The results show…
On high performance military aircraft, small changes in both wing twist and wing camber have the potential to provide substantial payoffs in terms of additional lift and enhanced maneuverability. To achieve the required wing shape, actuators made of smart materials are currently being studied under an ARPA/WL contract…
Results from a study on the epilithic diatom communities of a polluted river (Río Grande de Tárcoles basin) and an unpolluted river (Río Savegre) in the Central and Southern part of Costa Rica are presented. In this context the taxonomy of diatoms, the most abundant group of algae found in both rivers, is discussed. A…
Abstract We report on the gas phase reactions of small Fe + n clusters ( n = 2–10) with O 2 , N 2 O and CO 2 in an FT‐ICR mass spectrometer. Under our experimental conditions, clusters of all sizes reacted readily with O 2 and all but the dimer reacted with N 2 O. Only the smallest Fe + n clusters ( n = 2–4) appeared…
The surface properties of acrylic films, obtained through UV curing of bisphenol-A-dihydroxyethyl diacrylate (BHEDA) mixed with fluorinated acrylic monomers, were investigated. Three fluorinated acrylates were selected in order to vary the film composition, namely: 2-(n-perfluorooctylsulphonamido-N-butyl)ethyl acrylat…
Extensive recent efforts to understand the intrinsic brittleness or ductility of materials have focused on crack-blunting mechanisms using the Peierls stress concept. So far, the effects due to newly created ledge surface during crack propagation have been either ignored or included within some semiempirical approxima…