Materials Literature
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We report transport measurements through a single-molecule magnet, the ${\mathrm{Mn}}_{12}$ derivative $[{\mathrm{Mn}}_{12}{\mathrm{O}}_{12}({\mathrm{O}}_{2}\mathrm{C}\mathrm{\text{\ensuremath{-}}}{\mathrm{C}}_{6}{\mathrm{H}}_{4}\mathrm{\text{\ensuremath{-}}}\mathrm{SAc}{)}_{16}({\mathrm{H}}_{2}\mathrm{O}{)}_{4}]$, in…
A flexible and elastic carbon coil (see figure) has been fabricated using a continuous yarn of carbon nanotube arrays. The processed yarn is both elastic and pliable and can be freely manipulated and molded to any desired shape that is retained after heat treatment. Owing to their highly ordered macroscopic structures…
Upconverting lanthanide-doped nanocrystals were synthesized via the thermal decomposition of trifluoroacetate precursors in a mixture of oleic acid and octadecene. This method provides highly luminescent nanoparticles through a simple one-pot technique with only one preparatory step. The Er3+, Yb3+ and Tm3+, Yb3+ dope…
We report that nanoscale carbon particles (carbon dots) upon simple surface passivation are strongly photoluminescent in both solution and the solid state. The luminescence emission of the carbon dots is stable against photobleaching, and there is no blinking effect. These strongly emissive carbon dots may find applic…
This paper reports the results of an investigation on radial breathing vibrations of multiwall carbon nanotubes (MWNTs) embedded in an elastic matrix, based on a rigorous van der Waals (vdW) interaction which is dependent on the change of interlayer spacing and the radii of tubes. Each of the concentric tubes of MWNTs…
Polyaniline (PAn) emeraldine salts (PAn-Cl, PAn-Br, PAn-ClO4) were synthesized by the electrochemical method using different acids (HCl, HBr, HClO4). PAn salts in pellet form were used as sensors for organic (EtOH, CHCl3, C6H6) and inorganic (HCl, NH3) solvents. Electrical conductivity responses of PAns to five solven…
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…