Materials Literature
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Silicon nitride with anisotropic microstructure was fabricated by tape-casting of raw powder slurries with 0-10vol% seed particles of morphologically regulated β-Si3N4 single crystal, followed by gas pressure sintering of stacked sheets. The effect of orientation degree and area fraction of large elongated grains on m…
Two hydrocyclic compounds namely Qj-1 and Qj-2 have been synthesized in the laboratory from indigeneous chemicals and their corrosion inhibiting action has been evaluated by weightloss method electrochemical technique in 15% hydrochloric acid under boiling condition. The performance of synthesized compounds were compa…
A Fourier-integral-based model for the computation of magnetic field distributions due to an arbitrary excitation loop above a conducting half-space is formulated. Evaluation of the Fourier transform of the excitation current components, as usually required in the conventional approaches, is not needed in this model.…
This paper presents a thorough study on the prediction of the elastic-material constants ratios of blended short-fiber yarns, based on the theory developed by the author for yarns of a single fiber type by considering the structures as transversely isotropic and combined with the techniques used in dealing with hybrid…
Abstract. The progress of thermoelastic martensitic transformation/MT / in Cu-Al-Zn-Mn shape memory alloy/SMA / polycrystals subjected to nonproportional thermornechanical loadings was investigated by combined tension and torsion of tubular specimens (T>> Af). The strain response of SMA polycrystal to va…
This article reports on a study of cratering effects in thin anti-icing films designed to protect aircraft surfaces from snow and ice accumulation while the aircraft is on the ground awaiting takeoff. These fluids primarily consist of a glycol used as a freezing point depressant, water, and to a small extent thickenin…
The initiation of the cationic ring-opening polymerization of lactones and tetrahydrofuran by electron-deficient organosilicon species has been investigated. The formation of the long-lived silylcarboxonium ion 1a from γ-butyrolactone and the silyloxonium ion 2a from THF has been evidenced by 1 H, 13 C, and 29 Si NMR.…
Heteropolyacid H4PMo11VO40 has been deposited in different amounts on the surface of SiO2(Aerosil) and SiC supports. The samples were characterized by surface potential, ion scattering spectroscopy (ISS) and X-ray photoelectron spectroscopy (XPS) techniques. The thermal stability of the acid increases at a low acid co…
This volume contains the proceedings of the IXth annual meeting of the European Colloid and Interface Society (ECIS) which took place in Barcelona, Spain, in September 1995. The contributions cover a
Liquid sulfur was studied by Brillouin scattering from the melting point up to 200 °C. Polarized spectra show no evidence of the λ transition. The velocity of sound extracted from the Brillouin spectra agrees with previous ultrasonic measurements. The width of the central line in the depolarized spectra exhibits a max…
Abstract Indium tin oxide (ITO) whiskers were grown by VLS (vapour‐liquid‐solid) mechanism, using the electron shower method. The whiskers were grown above 200 °C, and the deposition rate was above 0.6 nm/s. The electron shower controlled the size of the whiskers, and the size was 30 nm in diameter and 600 nm in lengt…
Electrodeposition of Y on Ni and their alloying by molten salt electrolysis was attempted in an equimolar NaCl–KCl melt containing up to 4 mol% YCl3 at 1073 K. The electrolysis was carried out using the potentiostatic polarization method at constant potentials of −1.8, −2.0 and −2.2 V vs. Ag/AgCl(0.1) for 1.8 ks. In t…
Effects of CaO and Al2O3 on the reaction between MgO and C have been investigated and corresponding mechanisms have been proposed. A small amount (within the solubility limit) of Al2O3 slightly inhibited the MgO-C reaction, but a small amount (within the solubility limit) of CaO had little effect on the MgO-C reaction…
Oxidation behavior of titanium boride (TiB2) powder was investigated by thermal analyses (DTA and TG) and X-ray diffraction. From the DTA and TG analyses, a broad exothermic peak with a continuous weight gain was observed between 450 and 750°C. The exothermic peak was bimodal with a minimum around 550°C. High-temperat…
A series of bis(axially ligated) complexes [FeIIIL1(L′)2]+(H2L1= 3,7,12,17-tetramethyl-8,13-divinylporphyrin-2,18-dipropanoic acid; L′= ethyl-, n-propyl-, n-butyl-, n-octyl-, n-decyl-, n-dodecyl-, n-octadecyl-amine, 1,2-diaminoethane, morpholine or piperidine) have been prepared in solution and their electronic absorp…
Abstract The thermal decomposition of polyhalite (K 2 SO 4 · MgSO 4 · 2 CaSO 4 · 2H 2 O) was investigated by DSC/TG and X‐ray powder diffraction. The decomposition of the polyhalite starts at 285 °C in releasing the crystal water within one step. Simultaneously the decomposition of the polyhalite into anhydrite and tw…
Fourier transform infrared (4000-200 cm1) and Raman (3500-50 cm−1) spectra are reported for metal(II) halide 3,5-lutidine (3,5-dimethylpyridine) complexes of the following stoichiometries: M(3,5L)4X2 M=Co or Ni, X=C1 or Br; M=Mn or Cu, X=Br; M=Cd, X=I; M(3,5L)3X2 M=Fe, X=C1; M=Cu, X=Br; Hg(3,5L) X2 X=C1 or Br. Vibrati…
In the carbothermal reduction-nitridation method of producing silicon nitride powder, the effects of addition of silicon nitride seeds on the particle size and α-content in the resulting silicon nitride powder were investigated. The ratio of carbon to silica was determined to be 2.2, which is somewhat higher than the…
The short-range order of a series of sodium−iron phosphate glasses has been studied through X-ray diffraction with the purpose of investigating the structural role of iron ions in these glasses. Fe−O bond lengths and coordination numbers were obtained by simulating the difference radial curves calculated by subtractin…
Abstract Various metallocenes were tested for syndiotactic polymerization of propylene. Reduction in the amount of costly methylalumoxane (MAO) or replacement with the other components was accomplished. Small modifications in the metallocene ligands brought about remarkable differences in the resulting catalysts conce…