Materials Literature
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Article The Standard Enthalpy and Entropy of Formation of Rh2O3 - A Third-Law Optimization was published on January 1, 2000 in the journal High Temperature Materials and Processes (volume 19, issue 1).
A 9 mol% Y2O3stabilized ZrO2 specimen was annealed in boiling water for 1200 h, and the phase structure was examined by XRD and the chemical states of zirconium, yttrium and oxygen were examined by XPS. After annealing, the phase of the specimen remains entirely cubic, and the chemical states of the elements are not r…
The infrared emission spectra of CaF2–CaO–SiO2 melt were investigated by a method combining infrared emission spectroscopy and the hot-filament technique. Emission for spectra related to Si–O bond can be observed by this in situ technique. The influence of SiO2 and fluoride content on the spectrum was investigated, an…
Eddy-current loss in laminated steel cores is computed with unusual planar eddy finite elements over the wide frequency range produced in AC motor drives. The loss computed by the finite element method at low frequencies is shown to agree within 1% with a common simple formula. A formula used by radio-frequency engine…
ABSTRACT: Doxorubicin-loaded poly(butylcyanoacrylate) (PBCA) nanoparticles (NPs) were prepared by an emulsifier-free emulsion polymerization technique. The pH values of the polymerization medium and the weight ratios of doxorubicin to butylcyanoacrylate had a significant effect on the mean particle size. The particle…
YMnO3 single crystals were grown by flux method and plate-like single crystals with the c-axis perpendicular to the surfaces were obtained. The maximum size of these crystals was about 2 × 2 × 0.07 mm3. Ferroelectric properties were measured at various frequencies and abnormal behavior at the low frequencies were obse…
To improve the mechanical properties of blends of polypropylene (PP) and terpolymer of ethylene–propylene–diene (EPDM), a triblock copolymer, (PP-g-MAH)-co-[PA-6,6]-co-(EPDM-g-MAH), was synthesized by coupling reaction of maleic anhydride (MAH)-grafted PP (PP-g-MAH), EPDM-g-MAH, and PA-6,6. The newly prepared block co…
Edible films from wheat gluten were prepared with various amounts of glycerol as a plasticizer. Water vapor permeability, oxygen permeability, tensile strength and percentage elongation at break at different water activities ( aw ) were measured. Films with low amounts of glycerol had lower water vapor and oxygen perm…
Zircaloy-4, which is used widely as a core structural material in pressurized water reactors (PWRs), picks up hydrogen during service. Hydrogen solubility in Zircaloy-4 is low and zirconium hydride phases precipitate after the Zircaloy-4 lattice becomes supersaturated with hydrogen. These hydrides embrittle the Zircal…
The reactions of the tertiary phosphine oxides Ph3PO, Ph2MePO or Me3PO with hydrated yttrium(III) nitrate in ethanol gave the complexes [Y(R3PO)2(EtOH)(NO3)3] (R3PO = Ph3PO or Ph2MePO), [Y(Me3PO)2(H2O)(NO3)3], [Y(R3PO)3(NO3)3] (R3PO = Ph3PO, Ph2MePO or Me3PO), and [Y(Ph3PO)4(NO3)2]NO3. The species [Y(R3PO)4(NO3)2]NO3…
The thermal degradation of poly(ether imide) (PEI) was studied through a combination of thermogravimetric analysis and stepwise pyrolysis–gas chromatography/mass spectrometry (Py–GC/MS) techniques with consecutive heating of the samples at fixed temperature intervals to achieve narrow temperature pyrolysis conditions.…
In order to evaluate the influence of partial discharges on the lifetime of power electronic circuits models of different defects are developed. These defects cause PD within the silicon gel used to embed the circuit because of electrical and mechanical reasons. The first model is a spherical void in the middle betwee…
Adsorption and reaction of N2H4 and NH3 on powdered TiO2 have been studied by Fourier-transformed infrared spectroscopy. N2H4 decomposes on the surface to form NH3 and surface hydroxy groups at temperatures higher than ∽150°C. Based on these findings, a N2H4 reaction pathway on TiO2 is established to be N2H4→2NH2→NH+N…
The aim of the present work was to investigate the initial stages of NH3 interaction with nickel oxide layers formed on well-defined Ni(111) surfaces. The selected technique was x-ray photoelectron spectroscopy. Ammonia adsorption was performed at 10−7 mbar and room temperature in a preparation chamber attached to the…
After polyhydroxyalkanoate (PHA) fermentation for 42 - 48 h by the Azotobacter chroococcum G-3, the PHA content reached more than 75% of the dry weight. Biomass was isolated from culture by centrifugation and pretreated with freezing to release PHA pellet, then was treated with 10 g/L sodium dodecyl sulfate (SDS) for…
The behaviour of a model glass forming liquid is analyzed for a range of densities, with a focus on the temperature interval where the liquid begins to display non-Arrhenius temperature dependence on relaxation γ. Through analyzing the dynamics along with the properties of local potential energy minima sampled by the…
The use of a C3 complex bearing three imidazolate groups as a ‘building block’ allowed us to synthesize an infinite corrugated two-dimensional (2D) low-spin Fe(III)–high-spin Mn(II) polymer exhibiting weak ferromagnetic intralayer interaction through imidazolate bridge.
The microstructure, crystal structure, and morphology of oxide films growing on zirconium alloys have been studied to better understand the effect of tin on the corrosion of Zircaloy. Zr-Sn-Fe-Cr sheets whose tin content varied from 0.09 to 1.41% were prepared and corroded in 400°C static steam for 300 days. The weigh…
This thesis concerns the development of a systematic design procedure and predictive models for solution crystallisation processes, with a focus on both product and process performance.The introductory chapter starts with a discussion of the application, advantages and problems of crystallisation in the chemical proce…
The effects of biaxial stress on the magnetic properties of pure iron discs are reported. Isostress changes in the coercivity are well described by an effective stress /spl sigma//sub EFF/=/spl sigma//sub x/-/spl sigma//sub y/. Irreversible, stress-induced magnetization changes are presented in the form of contours in…