Materials Literature
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Studies of oxygen adsorption on a metal surface are reviewed. The relationship between oxygen adsorption and the initial stage of oxidation is considered. Current theories of low-temperature oxidation and experimental data obtained during recent decades are reviewed. Thermodynamic aspects of low-temperature oxidation…
Abstract Fine-controlled metal–organic hybridization is strongly desired for advanced nano-materials. Dendrimers are highly branched organic macromolecules with successive layers or “generations” of branch units surrounding a central core. Metal–organic hybrid versions have also been produced by trapping metal ions or…
Molten magnesium alloys oxidise rapidly during casting and handling if adequate prevention measures are not taken. New oxide films that form in a very short time during pouring seem to be one of the main reasons for dross-like defects. The characteristics of these new oxide films were observed. The magnesium alloy AZ9…
We present a spectrometer for inverse photoemission in the vacuum ultraviolet range with variable energy resolution between 400 and 165 meV full width at half maximum. The energy distribution of the electron beam used for excitation can be adjusted between 300 and 125 meV by the use of a toroidal 90 degrees electrosta…
Biomaterials are widely used in diverse applications as substances, materials or important elements of biomedical devices. Biodegradable polymers, both natural and synthetic, have been utilized in applications in which they act as temporary substitutes. Poly(alpha-hydroxy acids), especially lactic acids and glycolic a…
We apply systematic structural coarse–graining based on optimizing a potential against the structure obtained in atomistic simulations to the small organic glass former ortho-terphenyl (OTP). Atomistic radial distributions at various temperatures ranging from below the glass transition temperature to the equilibrium l…
It was found that noble metal nanoparticles including Ag, Au, and Pt nanoparticles in the presence of adsorbates such as iodide ion, cysteine, mercaptoacetic acid, mercaptopropionic acid, and thiourea could reduce lucigenin (bis- N -methylacridinium) to produce chemiluminescence (CL). Lucigenin−Ag−KI system was chosen…
Aligned multiwalled carbon nanotubes (MWCNTs) were grown on both sides of a metallic or metal-coated substrate by water-vapor-assisted chemical vapor deposition (CVD). Aligned CNT films with thicknesses ranging from 1 to >100 μm were obtained. By manipulating various operating factors, namely, the position of the subs…
In the present study we compared the clot inducing and dissolving properties of Calotropis gigantea R. Br. (Asclepiadaceae), Synadenium grantii Hook. f. (Euphorbiaceae) and Wrightia tinctoria R. Br. (Apocynaceae) latex extracts. All the three latex extracts hydrolyzed casein, fibrinogen and crude fibrin dose-dependent…
Abstract The relationship between the structure and the optical properties of isotactic polypropylene (PP) containing 1,3:2,4‐di‐ p ‐methylbenzylidene sorbitol (MDBS) has been studied. It is found that thinner injection‐molded plaques of PP/MDBS show higher levels of transparency than compression‐molded plaques. The e…
Spin Hamiltonian parameters for a ferromagnetically coupled dinuclear Ni(II) complex [Ni 2 (en) 4 Cl 2 ]Cl 2: J = +9.66 cm -1, g = 2.242, D A = −4.78 cm -1, D AB = −0.64 cm -1 and zj = −0.402 cm -1 were reliably determined from a powder sample by simultaneously fitting them to magnetic data and tunable-frequency high-…
A crystalline triply bridged molecular gyroscope has been prepared and analyzed by single-crystal X-ray diffraction. A convergent synthetic strategy was developed to control the direction of the three bridges, from the preferred two zonal and one meridional arrangement of a one-step cylclization process to the directe…
The effect of LiBH 4 on the hydrogen sorption performance of magnesium was investigated. It was found that the hydrogen storage properties of LiBH 4 /Mg mixtures exhibit a dramatic improvement as compared to plain magnesium powder. For example, at 250 °C, a LiBH 4 /Mg (mass ratio 1:4) composite can absorb 6.7 wt % hyd…
Taking into account the constraints imposed by the lattice symmetry, we calculate the phonon dispersion for graphene with interactions between the first and second nearest neighbors. We show that only five force constants give a very good fitting to the elastic constants and phonon frequencies observed in graphite.
The use of intelligent materials reacting to external stimuli is rapidly growing in the field of technical textiles. In this paper, the processing of conductive yarns for the development of smart textiles is discussed. Two different methods are exposed: the coating of textile yarns using conductive polymers, and the b…
Recent advances in shape memory alloys (SMAs) and shape memory polymers (SMPs) have inspired researchers to create intelligent textiles as self-regulating shape-changing structures responding to environmental variation, contributing to a new field in the scientific frontier of smart materials. This paper shows how app…
An analysis of the valence and conduction band electronic structure of TiO2 as studied by ultraviolet photoemission spectroscopy (UPS) and x-ray absorption spectroscopy (XAS) using synchrotron radiation is reported. Valence band spectra from UPS have been deconvolved using a five-peak model. The spectra are interprete…
Samples of novel nanocomposites of multiwalled carbon nanotube and poly (dimethylsiloxane), i.e., CNT-PDMS, at different filler concentrations are prepared. The mechanical/electrical and piezoresistance properties of these nanomaterials are studied in detail. The Gauge Factor (GF) of this nanocomposite, dependent on t…
Heterospin complexes [Cu(SQ)2Py].C7H8, Cu(SQ)2DABCO, and [Cu(SQ)2NIT-mPy].C6H6, where Cu(SQ)2 is bis(3,6-di-tert-butyl-o-benzosemiquinonato)copper(II), DABCO is 1,4-diazabicyclo(2,2,2)octane, and NIT-mPy is the nitronyl nitroxide 2-(pyridin-3-yl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl, have been s…
This work presents a method to measure the thermal conductivity and heat capacity of electrically conducting small-volume liquid samples using the 3omega technique. A mathematical model of heat transfer is derived to determine the thermal properties from the 3omega signal considering the device geometry. In order to v…