Materials Literature
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Poly(vinyl alcohol)-graft-poly(ε-caprolactone) (PVA-g-PCL) was synthesized by ring-opening polymerization of ε-caprolactone with poly(vinyl alcohol) in the presence of tin(II) 2-ethylhexanoate as a catalyst in dimethyl sulfoxide. The relationship between the reaction conditions of the solution polymerization and the c…
A time-resolved infrared spectroscopic investigation was made into the thermal imidization behavior of poly(3,4′-oxydiphenylene pyromellitamic acid) precursor in a microscaled film. The CNH bend–stretch (amide-II band) was found to be the most useful tool for examining the imidization mechanism in the precursor film.…
A spent clay from the oil refining industry was recycled through an extraction process using organic solvents for removal of residual oil, followed by reactivation through heat treatment. The solvents used showed the following order in the efficiency of oil extraction: methylethylketone > acetone > petroleum ether ≅ h…
An ethylene-air laminar diffusion flame successfully provided silicon substrates of anodic aluminum oxide (AAO) template with vertically oriented well-aligned carbon nanotubes. Field emission scanning electron microscopy (SEM) showed that open-tipped carbon nanotubes consisting of tube elements with the same length an…
The phase field microelasticity theory is used to formulate a three-dimensional phase field model of proper cubic → tetragonal martensitic transformation in a polycrystalline material under an external load. The model is based on the exact solution of the elasticity problem for the material with an arbitrary phase pat…
The effect of grain size on void swelling has its origin in the intrinsic property of grain boundaries as neutral and unsaturable sinks for both vacancies and self-interstitial atoms. The phenomenon had already been investigated in the 1970s and it was demonstrated that the grain-size-dependent void swelling measured…
The efficiency of Pd-doped porous silicon (PS) as a catalytic material for hydrogen sensing is studied. Pd is deposited by an electroless process on the internal surface of porous silicon. The catalytic behavior of Pd-doped PS samples is estimated and the parameters that influence the kinetics of the chemical reaction…
Tischendorfite, ideally Pd8Hg3Se9, is a new mineral species from the Eskaborner Stollen (Eskeborn Adit) at Tilkerode, Harz Mountains, Germany. It occurs as aggregates in a carbonate matrix, together with the associated metallic minerals clausthalite, tiemannite, chrisstanleyite, stibiopalladinite and gold. It is opaqu…
Black Africans are characterized by an increased prevalence of essential hypertension (EH). Several studies have shown that extractives from many plants are useful for the management and/or control of high blood pressure (hypertension). The aim of this study was to evaluate the antihypertensive efficacy of leaf extrac…
This paper presents a theoretical analysis of the dynamics of motion of spherical metallic particles under non-uniform fields for direct-current gas-insulated switchgear (dc GIS) and for electrostatic separators/sizers (ESS). The particle equations of motion between a pair of diverging conducting plates are numericall…
Changes of crystal structures and microstructures of SiO 2 and graphite powder mixtures induced by high‐energy milling, the effect of these changes on the reactivity of reactants, and the mechanism of enhanced SiC formation have been studied using a variety of analytical instruments, including X‐ray diffractometry, sc…
An improvement was proposed for the pore-size analysis of active carbons based on low-temperature (77 K) nitrogen adsorption isotherms measured over a wide range of relative pressures (5 × 10 −7 –0.995). It was shown that the applicability of the Barrett, Joyner and Halenda (BJH) computational method based on the Kelv…
A bstract : Single‐walled carbon nanotubes (SWNTs) are ideal systems for investigating fundamental properties in one‐dimensional electronic systems and have the potential to revolutionize many aspects of nano/molecular electronics. Scanning tunneling microscopy (STM) has been used to characterize the atomic structure…
The dependence of flexural strength on crystalline phase content, residual porosity, and sintering temperature has been investigated for ceramic cores based on a mixture of fused silica and zircon. The rule of binary particle mixture, adopted for three particle sizes of fused silica, predicts a critical weight fractio…
Three new organic inhibitors, namely, dicinnamylidene acetone (DCA), disalicylidene acetone (DSA), and divanillidene acetone (DVA), were synthesized in the laboratory and their inhibiting action was studied on corrosion of N-80 alloy in boiling hydrochloric acid (HCl) by the weight loss method. DSA exhibited the best…
Abstract Purified soil kaolins from Indonesia and Western Australia were characterized using analytical TEM, XRD, TGA and chemical analysis. The Indonesian kaolins, formed from tuff, consist of a mixture of tubular kaolin crystals with relatively low Fe concentrations and platy kaolin crystals with higher Fe concentra…
Yeast peptide:N-glycanase (Png1p; PNGase), a deglycosylation enzyme involved in the proteasome dependent degradation of proteins, has been reported to be a member of the transglutaminase superfamily based on sequence alignment. In this study we have investigated the structure-function relationship of Png1p by site-dir…
This paper describes the purification of diatomaceous earth mined in the Ankara region of Turkey. The diatomaceous earth was found to be essentially amorphous, but a small amount of crystalline illite, K 0.7 Al 2 (Si,Al) 4 O 10 (OH) 2 , was present in it. The complete chemical composition of the material was 74.4% SiO…
The effect of grain size on void swelling has its origin in the intrinsic property of grain boundaries as neutral and unsaturable sinks for both vacancies and self-interstitial atoms. The phenomenon had already been investigated in the 1970s and it was demonstrated that the grain-size-dependent void swelling measured…
Apart from the scientific interest, texture development in copper thin films is of crucial importance to their applications as interconnects or corrosion resistant coating. We report here a dominant 〈110〉 texture of copper thin films—preferred for oxidation-resistant applications—deposited by direct current magnetron…