Materials Literature
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Some recent results concerning the synthesis of carbon nanostructures in a thermal plasma generating by a plasma torch are presented. Several tests were carried out in different operational conditions. The plasma was formed with argon and different gas mixtures of argon-acetylene or argon-methane to which some catalys…
In this study, we attempt to determine the knittability of a yarn before knitting. Thirty different yarns are knitted into 1 × 1 rib structures with three different loop length values. The knitting process is observed and the number of machine stops, yarn breaks, and holes are recorded. The results of experiments are…
The reactivity of phthalonitrile, tetrafluorophthalonitrile and 4,5-dibutoxyphthalonitrile with unmodified surfaces of ZnO and SiO 2 and with the modified systems SiO 2 / Cp 2 Co , ZnO / Cp 2 Co , SiO 2 / Zn ( AcAc ) 2 prepared by deposition of cobaltocene ( Cp 2 Co ) and zinc acetylacetonate Zn ( AcAc ) 2 , was studi…
A homologous series of chiral swallow-tailed materials, I(p,q,m,n), derived from (L)-lactic acid was synthesized for investigation of the effects of variation of the molecular core structure and the terminal swallow-tailed group on the formation of mesophases. The mesophases and their corresponding transition temperat…
Most of the materials expand upon heating. There are a few families of materials which exhibit negative thermal expansion (NTE). ZrW2O8 is an example which gained a lot of interest in international literature recently. This cubic material has an exceptionally large and isotropic negative thermal expansion over its ent…
The first preparation of transparent conducting Cd 2 SnO 4 thin films by a simple MOCVD process is described. As‐deposited films using Cd(hfa) 2 (TMEDA) (Figure), at 365 °C are found to be highly crystalline with a relatively wide range of grain size of 100–300 nm. XRD indicates a cubic spinel Cd 2 SnO 4 crystal struc…
Abstract. The behaviour of potassium (K) in a range of arable soils was examined by plotting the change in exchangeable K of the topsoil (Δ K ex ) at the end of a 3–5 year period against the K balance over the same period (fertilizer K applied minus offtake in crops, estimated from farmers' records of yield and straw…
Spallation neutron and high-energy X-ray diffraction experiments have been performed to investigate the local structural changes in triphenyl phosphite (TPP) in the crystalline, glacial, glassy, and supercooled liquid phases. The hydrogen/deuterium first-order difference method shows a large increase in intensity due…
Abstract This study was aimed at finding a correlation between the experienced off‐flavor in packed foods and the presence of specific degradation products in LDPE packaging films. The possibility to trap degradation products by chemical reactions with scavengers, i.e., a zeolite additive or antioxidants, was investig…
Abstract Non-metamict betafite, a pyrochlore-group mineral with general formula A 2− m B 2 X O 6 Y (O,OH,F) 1− n · p H 2 O and 2 Ti > Nb+Ta and U > 20% at the A site, has been found at Le Carcarelle, (Latium, Italy). It occurs within miarolitic cavities of a foid-bearing syenitic ejectum enclosed within the pyro…
A robust constitutive model is desirable in order to guide the processing and development of ferromagnetism and for use in the design of ferromagnetic devices. In this paper, a non-linear constitutive model of soft ferromagnets is developed for general magnetomechanical loading histories. The experimental set-up and m…
Crack propagation in bcc iron at different strain rates and temperatures has been studied by atomistic simulation and continuum mechanics. The results show that stacking-fault creation, or twin formation and movement, are accompanied by crack extension in brittle fracture. Moreover, it is found, from the analysis of s…
Solids containing Co(II) and Fe(III) with molar ratios of 2/1, 3/2, 1/1, 2/3 and 1/2 have been synthetised by coprecipitation at constant pH. All they displayed a hydrotalcite-like structure with interlayer carbonate, which crystallinity decreases as the iron content was increased. No other crystalline phase was ident…
Samples with the chemical formula MnGaxFe2-xO4 (x = 0.0, 0.1, 0.3, 0.5and 0.7) were prepared by the usual ceramic method. X-ray analysis revealedthe presence of single spinel phase. The lattice parameters as well as theporosity were found to decrease while the density and grain size were increasedwith increasing Ga co…
The influence of clay preparation methods on the sorption and hydrolysis of carbaryl (1-naphthyl, N-methyl carbamate) by K+-saturated reference smectite SWy-2 was studied. Four methods were utilized: (1) The reference (or specimen) clay used as received was K+-saturated (hereafter referred to as whole clay). (2) High-…
Electroless plating of nickel (or copper) was carried out on glass (or silicon) substrates that were previously surface modified by using plasma-polymerization and grafting processes, and then activated by immersion in a simple acidic PdCl2 solution. Three pretreatments based on the deposition of plasma-polymerized th…
High performance polymeric foams have experienced a growing demand in aerospace applications such as cryogenic insulation, flame-retardant panels and structural sub-components. The Next Generation Launch Technology (NGLT) program requires foams capable of retaining their structural integrity while providing insulating…
${\mathrm{Pr}}_{2}{\mathrm{Fe}}_{17}{\mathrm{H}}_{5}$ is an interesting compound where isolated hexagons formed by the tetrahedral sites of the host metal lattice are filled with hydrogen atoms. A localized jump diffusion of hydrogen atoms in ${\mathrm{Pr}}_{2}{\mathrm{Fe}}_{17}{\mathrm{H}}_{5}$ over the vertices of t…
Using molecular dynamics simulations we investigated the effect of aging on static and dynamic properties of supercooled Al2 O3 models at the temperatures of 2100 K and 5600 K . Simulations were done in the basic cube under periodic boundary conditions containing 3000 ions with Born-Mayer type pair potentials. We obta…
Effective complex piezoelectric and dielectric constants of disordered heterogeneous systems, such as statistical mixtures consisting of spheroidal particles of the same orientation but with random distribution in space, are studied. It is found for the first time that, in such systems, there exists giant piezoelectri…