Materials Literature
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Work on the synthesis and characterization of well-ordered mesostructured SiO x N y thin films (MSONTFs) on silicon wafers is described in this paper. The MSONTFs, characterized by high surface area, good order and uniform mesopores, were prepared by thermally treating the calcined mesoporous silica thin films (MSTFs)…
The phenomenon of holographic light scattering in centrosymmetric crystals of sodiumnitroprusside is investigated by analyzing (1) the effect of light polarization and wavelength of pump- and readout beams, (2) the angular intensity distribution, and (3) the kinetics of scattered light. It is shown that the scattering…
The viscometric coefficient, kAB, characterizing the interaction of chemically dissimilar polymer segments was estimated from changes of the intrinsic viscosity of chitosan in “pseudosolvents,” i.e., dilute solutions of poly(ethylene glycol) (PEG) in a solution of 0.1 M acetic acid/0.2 M sodium acetate (1:1). The blen…
The morphology of polyaniline (PANI), granular or tubular, depends on the acidity conditions during the reaction rather than on the chemical nature of the acid. In reference to acetic acid in which media nanotubes had been observed, dichloroacetic acid (DCA) and trichloroacetic acid (TCA) were used to synthesize polya…
Abstract Summary: A simple quantitative model for the analysis of EFM images of three‐ or more‐component polymer blends is applied to determine the dielectric constants of the blend constituents. The value of the dielectric constant of PIPA calculated from the EFM images of POMA‐PIPA‐APP blend is determined in good ag…
Abstract— The development of materials for vertically aligned (VA) active‐matrix display technology is briefly reviewed and the newest generation of liquid crystals for this application is disclosed. These new materials possess a unique combination of high dielectric anisotropy Δε and low rotational viscosity γ 1 with…
Electronic structures of boron-nitride (BN) nanotubes and a BN cone-structure material were studied by using a high energy-resolution electron energy-loss spectroscopy (EELS) microscope. A trial of the whole electronic structure study of hexagonal BN (h-BN), which consists of flat BN honeycomb layers, was conducted by…
The current-voltage relationship dominated by space-charge-limited conduction for high dielectric constant and ferroelectric thin films, including (Ba,Sr)TiO3 and Pb(Zr,Ti)O3, is derived taking into account the electric field dependence of permittivity. Typical current-voltage characteristics are given by the derived…
Changes in the structural and electrical properties of a Ge2Sb2Te5 alloy thin film induced by phase transition were investigated using various analytical techniques. X-ray diffraction and scanning photoelectron microscopy showed that the phase separation occurred in a local area of the film during a phase transition w…
Site-specific dopant profiling across a silicon p-n junction has been performed in the scanning electron microscope (SEM) on samples prepared using focused ion beam (FIB) milling. The results are compared with the dopant contrast obtained after using non-site-specific cleaving and tripod polishing of specimens. FIB mi…
Dislocation nucleation at a surface step is analyzed based on a general variational boundary integral formulation of the Peierls–Nabarro dislocation model. By modelling the surface step as part of the surface of a three-dimensional crack, the free surface effect is taken into account by transferring the half space pro…
Abstract 1,2‐Bis(2‐ n ‐alkyl‐1‐benzofuran‐3‐yl)perfluorocyclopentenederivatives have been synthesized and their photochromic performance has been studied in solution as well as in the single‐crystalline phase. All derivatives undergo photochromism in hexane solution. The introduction of long alkyl chains at the 2‐posi…
The quantum conductance modulations induced by an axial magnetic field for deformed single-walled carbon nanotube (SWNT) interferometers under two types of deformation i.e., uniaxial tensile and torsional strains, have been studied in the tight-binding approximation. We have analytically derived the expression for the…
The reduction of dose onboard spacecraft and aircraft by appropriate shielding measures plays an essential role in the future development of space exploration and air travel. The design of novel shielding strategies and materials may involve hydrogenous composites, as it is well known that liquid hydrogen is most effe…
Abstract— The electro‐optical properties of optically isotropic liquid‐crystalline composites prepared by in‐situ photo‐polymerization of cross‐linking monomers in the isotropic phase of chiral liquid crystals were investigated. The magnitude of the electric birefringence of the composites decreased as the chirality o…
Using Brenner’s second generation reactive empirical bond order potential, we show by molecular dynamics that the single-walled carbon nanotube with a diameter of about 5nm under axial strain possesses excellent reversible mechanical bistability. This feature provides a high potential of using only one single-walled c…
Intense and broad visible photoluminescent (PL) band in structurally disordered SrWO4 compounds was observed at room temperature. The polycrystalline scheelite strontium tungstate (SrWO4) samples prepared by the polymeric precursor method at different temperatures of annealing were structurally characterized by x-ray…
ABSTRACT Partial monoacyl esters of glycerol and fatty acids (monoacylglycerols) exhibit amphiphatic properties and are widely used as potent surfactants, antistatics, antibacterial compounds and lubricants. Pure 1‐monoacylglycerols may be prepared by the addition of individual fatty acids to glycidol. This work deals…
ABSTRACT The interaction between polylactic acid (PLA) and wheat gluten (gluten) has been studied using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, X‐ray diffraction and phase contrast microscope. The primary DSC thermogram of gluten showed…
After annealing at 900°C, the ferromagnetic properties of (Zn0.93Mn0.07)O thin films were dramatically improved. The resultant remanent magnetization (Mr) and Curie temperature (TC) were 1.17μB∕Mn and 83K. The improvement of ferromagnetism was confirmed to as resulting from the enhancement of magnetic anisotropy. This…