Materials Literature
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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…
Photoluminescence (PL) spectra of single-crystal ZnO bulk under hydrostatic pressure are studied using the diamond-anvil-cell technique at room temperature. The PL spectrum of ZnO single crystal taken at atmospheric pressure was dominated by a strong near-band-edge exciton emission. The emission line was found to shif…
We have carried out a detailed investigation on the dielectric and pyroelectric properties in ${\mathrm{Ba}}_{x}{\mathrm{Sr}}_{1\ensuremath{-}x}{\mathrm{TiO}}_{3}$ (BST) throughout the concentration range ($x$ from 0 to 1), with the emphasis on quantum effect and phase transition. The approach was realized by employin…
Armour systems require advanced solutions, relying on a combination of materials of different natures to provide adequate ballistic protection and weight saving. For the first time in the present study composite layered systems based on monolithic armour ceramic tiles joined with polymer infiltrated ceramic foams have…
Dielectric measurements are reported as a function of temperature for phase transformations in the lead magnesium niobate-lead titanate system (PMN-PT). Data are given for single crystal specimens in the morphotropic phase boundary (MPB) region. Transition temperatures were determined from dielectric loss data. The ch…
One-dimensional nanostructure growth behaves very differently on the ± (0001) polar surfaces of wurtzite ZnO, resulting in asymmetric growth in these two directions. In this report we show that by tuning the degree of supersaturation, the growth asymmetry can either be rationally utilized or broken to obtain single- o…
Using density functional theory with the generalized gradient approximation, we have studied the interaction between a single Pt atom and a carbon nanotube. The bridge adsorption site on the outer wall of nanotube is favorable. The curvature affects the binding strength. Compared to the larger nanotube, Pt could bind…
The effects of hBN content on microstructure, mechanical properties, and machinability of the pressureless-sintered Si3N4 ceramics were investigated. Flexural strength, Young’s modulus, and hardness decreased with increasing h-BN content. The mechanical properties are decreased mainly because of increased porosity of…
A single crystal of commercially available `iron(III) perchlorate hexahydrate' has been structurally characterized and shown to be hexaaquairon(III) tris(perchlorate) trihydrate, [Fe(H 2 O) 6 ](ClO 4 ) 3 ·3H 2 O. The structure contains [Fe(H 2 O) 6 ] 3+ complex ions, charge-balancing perchlorate ions and three water m…
As the result of combustion reaction in Al-Al2O3-N2 system, AlON phase can be synthesized in the range of initial nitrogen pressure, from 1 to 5 MPa. On the occasion of rm = 0.3, the unreacted Al was detected in the case of 1 MPa of PN2. Its intensity decreases with an increase of nitrogen pressure. Ultimately, no pea…
We report on the stress response of gyroidal and lamellar amphiphilic mesophases to steady shear simulated using a bottom-up lattice-Boltzmann model for amphiphilic fluids and sliding periodic (Lees-Edwards) boundary conditions. We study the gyroid per se (above the sponge-gyroid transition, of high crystallinity) and…
Foamed metal is a kind of porous material with pores in the metal matrix. One of the possible process routes is to blow gas bubbles into liquid metals. However, many metallic foams produced by this foaming method have coarse and irregular cell structures. The industrial aim is to fabricate foams with more uniform stru…
The structural, magnetic, and transport properties of Co-doped ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6}$ in a series of nominal composition ${\mathrm{Sr}}_{2}{\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}{\mathrm{MoO}}_{6}$ $(x=0$, 0.05, 0.1, 0.2, 0.4, 0.7, and 0.9) are studied. At room temperature, the crystal struc…
FRP (fiber-reinforced polymer) ships used with small boats for fishing pose numerous problems related to both the environment and recycling. From this perspective, aluminum offers an environmentally friendly substitute for FRP that is easy to recycle and imparts a high added value to fishing boats, with a reduction in…