Materials Literature
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Fine structure in the principal OH-stretching bands of amphiboles of the tremolite-ferro-actinolite series have been examined. In samples with partly filled A sites, a broad (composite) band is observed at 3725~3680 cm -1 and is assigned to two types of configurations: (M1M1M3)-OH- A ( Na,K): T1 Si T1 Al in which Al o…
A new family of manganites, LnBaMn2O6 − γ(Ln = Nd, Sm, and Gd), is obtained by the method of topotactic reactions. In these compounds, rare-earth and barium ions are ordered, which results in a dramatic increase in the temperature of transition to the paramagnetic state. Thus, a SmBaMn2O6 compound with a disordered ar…
Potentiodynamic polarisation and impedance measurements are used to examine the corrosion behaviour of some magnesium alloys, which were previously stressed in order to establish the effects of mechanical deformation on the electrochemical reactions at the interface alloy/electrolyte. Due to the increasing demand for…
The untwisting of the helical structure of a chiral liquid crystal (CLC) in a thin plane layer exposed to an external action (temperature or field) and its dependence on the molecular adhesive forces at the layer boundaries are studied theoretically. It is shown that the critical electric (magnetic) field for complete…
The grafting of 2-vinyl-4,4-dimethylazlactone (VDM) onto electron-beam activated poly(propylene) (PP) films and fabrics and subsequent reaction of the anchored azlactone groups with various nucleophiles was investigated. Surface graft polymerization was demonstrated by FTIR and X-ray photoelectron spectroscopy (XPS) a…
This article applies ab initio calculations at the (i) Hartree–Fock self-consistent field single determinant and (ii) configuration interaction multideterminant expansion levels to study the diagonal components of the dynamic dipoles, Δμi/Δqj with i=j, or equivalently infrared effective charges, ei*, associated with a…
The pilling behavior of polyester/viscose, polyester/viscose/Lycra®, and %100 cotton fabrics, is investigated in both normal and wet conditions. The experimental results show that the pilling tendency of fabrics in the wet state is directly related to the constituent fiber tenacity in the wet state. We also test three…
Single‐phase β′‐SiAlON (Si 6− z Al z O z N 8− z , z = 0–4.2) ceramics with porous structure have been prepared by pressureless sintering of powder mixtures of á‐Si 3 N 4 , AlN, and Al 2 O 3 of the SiAlON compositions. A solution of AlN and Al 2 O 3 into Si 3 N 4 resulted in the β′‐SiAlON, and full densification was pr…
The thermoluminescence (TL) glow curves of quartz of various origins were measured under two different conditions, (1) unannealed samples and (2) samples annealed at 500 degrees C and 900 degrees C. The different glow curves obtained were analysed using first order kinetics and glow curve deconvolution (GCD) analysis.…
Mn 0.5 Zn 0.5 Fe 2 O 4 ferrite nanoparticles (<100 nm) in SiO2 matrix have been prepared by the sol-gel method. The particle size was varied by changing the duration of heat treatment above crystallization temperature. An x-ray diffraction study indicates the presence of single-phase spinel ferrite in the sampl…
The crystal structure and magnetic properties of the La1−xBixMnO3+λ system (0⩽x⩽1;λ⩽0.08) are studied as functions of the oxygen and bismuth contents. In oxidized samples La1−xBixMnO3+λ a phase transition from a ferromagnetic state (rhombohedric phase) to a state of the spin glass type (quasitetragonal phase) is obser…
The biodegradation of PVA blends with natural polymers, such as gelatin, lignocellulosic by-products (sugar cane bagasse), as well as poly(vinyl acetate), was investigated in respirometric tests aimed at reproducing soil burial conditions. The observed behavior is discussed in terms of the influence of each blend comp…
The time and temperature evolution of intracrystalline Mg-Al exchange in synthetic MgAl 2 O 4 spinel was studied by single-crystal X-ray diffraction of quenched samples, with the aim of contributing to rock cooling-rate estimation. Flux-grown, homogeneous crystals (0.1 mm in size) were annealed at 1000°C and then were…
Abstract The unperturbed chain dimensions (〈 R 2 〉 o / M ) of cis / trans ‐1,4‐polyisoprene, a near‐atactic poly(methyl methacrylate), and atactic polyolefins were measured as a function of temperature in the melt state via small‐angle neutron scattering (SANS). The polyolefinic materials were derived from polydienes…
This paper describes the development of an active robot hand, which allows smooth and lifelike motions for anthropomorphic grasping and fine manipulations. An active robot finger 10mm in outer diameter with a shape memory alloy (SMA) wire actuator embedded in the finger with a constant distance from the geometric cent…
The effect of sodium n,n-diethyl dithiocarbamate (SDEDTC) on the corrosion of mild steel in 0·5 mol L-1 HCl solution was studied using weight loss and potentiodynamic polarisation methods. Experimental data revealed that SDEDTC acted as an inhibitor in the acid environment and, furthermore, that the compound was a mix…
In situ monitoring of the electrical resistivity of ZnO and W thin films during atomic layer deposition (ALD) was performed using a four-point probe. Large oscillations were observed during the ZnO ALD resistivity measurements. The resistivity dramatically increased during each diethyl zinc exposure and decreased duri…
The 57 Fe NMR spectra of the 57 Fe-enriched (95.43%) ceramics of a ferroelectric antiferromagnet BiFeO 3 with a spatially modulated magnetic structure have been studied. It is established that a cycloidal spin modulation in BiFeO 3 causes a spatial modulation of the spin-spin relaxation rate along the magnetic cycloid…
An investigation was carried out on the effect of heat treatments on the stress corrosion cracking (SCC) resistance of X-80 pipeline steel in 0.01 M and 0.05 M sodium bicarbonate (NaHCO3) solutions using the slow strain rate testing (SSRT) technique. The heat treatments were either water-quenched, water-quenched and t…
Three organic inhibitors containing heteroatoms, namely: undecenoic acid hydrazide (UAH); 2-mercaptobenzothiazole (MBT); and 2-hydrazinobenzothiazole (HBT) have been synthesised in the lab and their inhibiting action on the corrosion of carbon steel in 1N HCl was investigated by means of two different techniques, name…