Materials Literature
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Carbon nanotubes (CNTs) were grown on 304 stainless steel using iron as a catalyst. By using the applied voltages of 4-6 kV, iron wire with 0.5 mm in diameter was sparked for 1, 2, 10 and 100 times to form catalytic dots on the steel substrate. CNTs were subsequently grown in a gas mixture of 10 ml/s Ar and 0.1 ml/s C…
The crystal structures of phase I and phase II of dimethyl sulfate, (CH3O)2SO2, have been determined using complementary high-resolution neutron powder and single-crystal X-ray diffraction techniques. Below its melting point of 241 K dimethyl sulfate crystallizes in an orthorhombic structure (I) in the space group Fdd…
Sub-micron and nano-sized β-SiC powders were sintered with AlN and Y2O3 as sintering additives by spark plasma sintering (SPS). The sintered densities reached >95% of theoretical with a different molar ratio of AlN to Y2O3 at total amount of 10vol% and temperature of 1900oC for 10min in N2 atmosphere under a pressu…
We investigated the mechanism of chemical reaction between Bi2O3 glass and water solution during milling. As a result, the frit condition affected discoloration with crystallization. After milling, there was a deposited layer on the frit surface. The layer was composed of leached ions, contaminates of metal oxides, an…
The objective of this study is to synthesize the single phase aragonite precipitated calcium carbonate by the carbonation process in the Ca(OH)2-MgCl2-CO2 system. Many researchers reported the influence of Mg2+ ion on the synthetic properties. The inhibition of calcite nucleation and crystal growth, distortion of calc…
The candidate gases for the replacement of SF6 in magnesium melt protection were reviewed from the viewpoint of environmental effects, melt protection properties, and chemical properties. The surface films formed under fluorine bearing gases were analyzed by using XPS. The XPS results revealed that the surface films c…
This paper presents an experimental finding in the Split Hopkinson Pressure Bar (SHPB) technique to obtain a better compressive stress strain data for rubber materials. An experimental technique which modifies the conventional SHPB has been developed for measuring the compressive stress strain responses of materials w…
The paper deals widi die evaluation of interfacial shear stress (ISS) between reinforcement fibre (hemp) and polypropylene matrix through single fibre pull-out method and subsequently the critical length of the composite grade hemp fibre has been determined. In the present study the average ISS value of 5.9 MPa was us…
Enzymatic scouring has been investigated for over two decades as an environmentally friendly process. Replacement of harsh alkalis by enzymes minimizes not only the COD and BOD in effluents, but also the amount of effluents, because the rinsing step may be omitted. However, advantages of enzymatic scouring on treated…
A large magnetocaloric effect (MCE) has been achieved in a rare-earth-free CoMnSb alloy at low magnetic field and intermediate temperature. It is interesting to note that a relatively large magnetic entropy change ∣ΔSM∣ of 2.06J∕kgK with ΔH=0.9T was obtained around 471K. Arrott plots at various temperatures reveal tha…
We investigate the lateral shift of the optical beams incident from an ordinary isotropic medium into an anisotropic metamaterial half space. Different from the isotropic case, the shift is closely related to the dispersion relation of the anisotropic medium and some anomalous phenomena have been discovered. The lossy…
Bypass cement dust from the Rabigh plant in Saudi Arabia was examined for use in the preparation of technical coloured glass and glass ceramic materials. The bypass cement dust made up about 57 wt-% of the batch constituents, depending on composition. The bypass composition was sometimes modified by additions of other…
Oxide glasses having lower glass transition temperature are widely used in electric devices. The oxide glasses usually contain lead oxide. Recently, lead oxide glasses have been replaced with lead-free oxide glasses because of the environmental pollution. We investigated the thermal properties and the glass formation…
Carbon nanofibres (CNF) have been formed by polyethylene pyrolysis, using a Ni catalyst and a hydrogen–argon gaseous mixture. The temperature interval of 500–700 °C was chosen, because small sized Ni catalyst particles are formed in this case. TEM and high resolution TEM studies revealed catalyst particles of spherica…
Activated carbon fibers were prepared from stabilized PAN-based fibers by chemical activation using hydroxides at different concentrations. The experimental data showed variations in specific surface area, microstructure, pore size distribution, and amounts of iodine adsorbed by the activated carbon fibers. Specific s…
The initial stage of vacuum evaporated tetracene films on hydrogen-passivated Si(100) substrates has been investigated using ex situ atomic force microscopy. Three-dimensional (3D) islands and dendrites are obtained at low deposition rates near equilibrium growth conditions. By increasing the deposition rate to a prop…
The polymorphic phase transition of 1,2,4,5-tetrachlorobenzene (TCB) has been investigated using neutron powder diffraction and single-crystal X-ray diffraction. The diffraction experiments show a reversible phase change that occurs as a function of temperature with no apparent loss of sample quality on transition bet…
Structural ordering of the flash-evaporated Ni2MnGe Heusler alloy films has been studied by magneto-optical (MO), optical, and magnetic methods. The properties of the films have been compared with the corresponding properties of the bulk Ni2MnGe samples with L21 and tetragonally distorted L21 structures, respectively.…
Amorphous iron or cobalt carbide nanoparticles with a carbon onion structure were produced using a pulsed laser ablation of metallocene powders at room temperature. While they are ferromagnetic at room temperature, they exhibit a drastic change in magnetic spin moments at 20–30 K. These magnetic properties are ascribe…
Carbon nanotubes (CNTs) are frequently torn away by the electric field during field emission, which usually results in device failure due to short circuit or discharge. An AFM cantilever is employed to measure the tensile force experienced by individual field-emitting CNTs, from which the Maxwell stress and the local…