Materials Literature
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We study two-component single-file diffusion inside a narrow channel that at its ends is open and connected with particle reservoirs. Using a two-species version of the symmetric simple exclusion process as a model, we propose a hydrodynamic description of the coarse-grained dynamics with a self-diffusion coeffcient t…
The synthesis of (group I) hydrochloric acid-doped poly(aniline-co-toluidine), poly(aniline-co-thiophene), poly(aniline-co-o-phenylenediamine), and poly(aniline-co-2-aminopyridine) as well as their hydrochloric acid-doped homopolymers of polyaniline, poly-m-toluidine, poly-o-phenylene diamine, and poly-2-aminopyridine…
Abstract We report the effect of organosilica precursor isomers on the interfacial interaction between polyimide and organosilica in polyimide/organosilica hybrid composite films. Poly(4,4′‐oxydianiline biphenyltetracarboxamic acid) (BPDA‐ODA PAA) was used as the polyimide precursor, while the organosilica was made us…
The authors report on the stress-strain and strain-temperature behaviors of a Ni2MnGa alloy. Depending on the applied stress during cooling from austenite, different levels of transformation strain were observed culminating in the formation of a single variant of martensite and transformation strain of 4%. The results…
Ethylene vinyl acetate (EVA)/organoclay/compatibilizer nanocomposites were produced using a melt compounding technique in an internal mixer, Haake Rheometer, at 120°C and 50 rpm rotor speed. Effects of organoclay loading (from 2 to 10 phr—parts per hundred of resin and methyl ethyl ketone (MEK), used as a compatibiliz…
This work presents an organic thin film transistor using double polymer layers, polymer electrolyte/conjugated polymer, i.e., poly(diallyldimethylammonium chloride) (PDDA)/poly(diphenylamine) (PDPA) structure. The single mobile anions (Cl−) pending on the PDDA are stuffed into the conjugated polymer to dope the nitrog…
We present experimental evidence of the presence of isolated screw dislocations in smectic-A liquid crystals observed by polarizing microscopy. In a wedge-shaped homeotropic cell, the edge and screw dislocations interaction gives rise to a strong-enough optical contrast and makes visible their mutual intersections at…
Abstract Complexation reactions of Fe II and Fe III salts with the tridentate ligands 2‐(diphenylphosphanyl)benzaldehyde benzoylhydrazone [(H)PNO] and N ‐[2‐(diphenylphosphanyl)benzylidene]‐2‐(2‐pyridyl)ethanamine (PNN) was carried out. For (H)PNO, reaction of a stoichiometric amount of anhydrous FeCl 2 in the presenc…
Abstract The influence of various factors on the aging of poly(1‐trimethylsilyl‐1‐propyne) (PTMSP) during long‐term storage in air was investigated with Fourier transform infrared spectroscopy. Most attention was paid to the differentiation of oxidation, the reduction of the free volume, and the absorption of low‐mole…
Nanocrystals (NCs) of cuprous oxide (Cu2O), cupric oxide (CuO), and copper metal (Cu) are fabricated in silica glasses (SiO2) by implantation of 60keV Cu− ions at different annealing conditions. At room temperature, Cu2O NCs show two sharp absorption peaks at 2.58 and 2.71eV due to autoionized exciton states, and Cu N…
Detailed electrical resistivity measurements for different twin configurations and crystallographic directions on Ni49Mn29Ga22 Heusler alloy are presented. Important results of these measurements are (i) the resistivity of the crystal is not related to the number of twin boundaries present (as previously reported) but…
Abstract EPDM incorporated into blends of natural rubber/butadiene rubber (NR/BR) improves ozone resistance. In this work, the inferior mechanical properties of NR/BR/EPDM blends generally obtained by conventional straight mixing are overcome by utilizing a reactive processing technique. The entire amount of curatives…
Nano-Sb 2 O 3 /mica flame retardant composition is synthesized by colloidal and assembling techniques. The morphology and assembled behavior of nano-Sb 2 O 3 on mica are analyzed by means of X-ray powder diffraction (XRD) and transmission electron microscopy (TEM). The flame retardant properties and mechanism of nano-…
Strontium barium niobate has the tungsten-bronze structure with a tetragonal unit cell, and it exhibits negative thermal expansion along the c axis between −120°C and room temperature while having a positive thermal expansion along the a axis for the same temperature range. At higher temperatures, close to the Curie t…
Abstract The NR/BR blend compound formulations for tire sidewall applications contain a set of stabilizers added to prevent degradation mainly due to oxygen, ozone, and heat. 6PPD is the most effective and widely used antiozonant in tire compounds, but is a highly staining material causing a surface discoloration of t…
The formation of rings composed of uniformly sized triple-walled carbon nanotubes has been demonstrated and characterized by high resolution transmission electron microscopy. These rings are found in the products from acetylene decomposition on Fe∕MgO catalyst in a fluidized bed. This finding expands the libratory of…
The electro-optical modulation effect of a (10,0) boron nitride nanotube is investigated by first-principles, density functional theory calculations. The optical properties of boron nitride nanotubes can be tuned through perturbation by a transverse electric field. Large optical anisotropy in variations of the absorpt…
Monolithic titania exhibiting a hierarchical, bimodal meso‐macroporosity has been prepared through a template free sol‐gel synthesis route. The macropore diameter can be controllably varied in the range 0.4–4 µm still maintaining a narrow pore size distribution. The macropores form as a consequence of parallel gelatio…
Absorption spectra of trilayer rhombohedral graphite are studied with the tight-binding model. The interlayer interactions cause a tiny energy gap and band-edge states in electronic structures. The band-edge states exhibit logarithmic divergences and discontinuities in the density of states. The frequencies of the abs…
The structure of high-velocity screw dislocations in Cu was investigated using molecular dynamics. We observed that the dissociation width of the dislocation into its partials is velocity dependent and identified two main regimes at low and high velocities with respect to the shear wave velocity. In the first regime t…