Materials Literature
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Abstract The preparation of a new unsymmetrical kink non‐coplanar heterocyclic diamine, 1,2‐dihydro‐2‐(4‐aminophenyl)‐4‐[4‐(3‐phenyl‐4‐aminophenoxy)phenyl]‐(2 H )phthalazin‐1‐one (3), from a readily available unsymmetrical phthalazinone bisphenol‐like (1) was described. The diamine can be directly polymerized with var…
UV-curable polymer films were prepared containing a commercially available, organically modified montmorillonite (MMT). It is believed that nanoclay-containing UV-curable polymers can find wide ranging applications in future microelectronic materials. Polymer films containing the commercially available MMT clay (Nanom…
The formation of colloidal metallic copper and of nanometer films on quartz and silicon substrates by irradiation of bis(2,4-pentanedionato)copper(II) ethanol solutions with UV light was investigated. The 254-nm-light absorption in the bulk of the solution causes formation of stable colloidal copper through two consec…
By using a combination of atomic force and confocal microscopy, we explore the effect of pH and salt on the stiffness of polyelectrolyte microcapsules with shells composed of strong polyanions and weak polycations. The stiffness of the capsules was found to be largest in water. It decreases slightly with added salt an…
We have experimentally verified that carbon nanotube field-effect transistors do not show any signal degradation when operated at frequencies up to 580 MHz, the limit of our current measurement setup. In order to characterize the high-frequency response of individual single wall carbon nanotubes in a three-terminal tr…
Abstract The miscibility of blends of a polyarylate (PAr) with poly(trimethylene terephthalate) (PTT) was investigated in the whole composition range by DSC measurements. With the exception of the 90/10 composition, which was fully miscible, the blends showed partial miscibility, and contained a nearly pure PTT phase…
Structural and electronic properties of ${\mathrm{Si}}_{3}{\mathrm{P}}_{4}$ were investigated using first-principles total-energy method based on density-functional theory and the local-density approximation (LDA). It was found that pseudocubic-${\mathrm{Si}}_{3}{\mathrm{P}}_{4}$ is energetically favored relative to o…
The melting of zircon and the amorphous state produced by quenching from the melt were simulated by molecular dynamics using a partial charge model combined with the Ziegler-Biersack-Littmark potential. The model has been established for the description of the crystalline and aperiodic structures of zircon in order to…
A new molten salt synthesis route to the mixed-valence sodium titanate NaTi 2 O 4 has been discovered. Reduction of Na 8 Ti 5 O 14 by Ti metal powder in a 3:1 molar mixture of NaCl:KCl at 770 °C produced crystals of NaTi 2 O 4 . Use of the molten salt flux lowered the synthesis temperature of this compound by over 400…
Abstract The mechanical properties of hybrid reinforced rigid polyurethane (PU) foams were investigated with the reinforcing agent SiO 2 and fibers. The effect of content of SiO 2 and fibers and the effect of length of fibers on the properties of the PU composite foam were emphatically analyzed. The experiment results…
We report x-ray reflectivity measurements on polystyrene thin films supported on silicon wafer. In annealing experiments, we found fast and slow contraction processes in the thin films above the glass transition temperature. The former is the normal relaxation (annealing) process observed in bulk, and the latter is un…
Self-interaction corrected local spin-density approximation calculations were performed for ${\mathrm{La}}_{(1\ensuremath{-}x)}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ (LSMO) $(0.0<x<0.5).$ The influence and inter-relationship of Sr doping, magnetic structure, O displacements, and phase segregation on the Mn charge…
The polarization switching process is certainly the most important feature of ferroelectric materials from fundamental as well as practical points of view. In this paper, a one-dimensional lattice model is presented in order to describe the polarization switching process in ferroelectric materials, incorporating the c…
Strong effects of surface depletion have been observed in metallic La-doped SrTiO3 thin films grown on SrTiO3 substrates by pulsed-laser deposition. The depletion layer grows with decreasing temperature due to the large temperature-dependent dielectric response of SrTiO3. When the depletion layer becomes comparable to…
Abstract Some discovery work was done on the synthesis of clay nanocomposites based on renewable plant oils. Functionalized triglycerides, such as acrylated epoxidized soybean oil, maleinized acrylated epoxidized soybean oil, and soybean oil pentaerythritol maleates, combined with styrene were used as the polymer matr…
We describe a theory of Mn local-moment magnetization relaxation due to $p\ensuremath{-}d$ kinetic-exchange coupling with the itinerant-spin subsystem in the ferromagnetic semiconductor (Ga,Mn)As alloy. The theoretical Gilbert damping coefficient implied by this mechanism is calculated as a function of Mn-moment densi…
The formation energy, geometry, and electronic structure of isolated oxygen and aluminum vacancies in bulk and on the (0001) surface of corundum $(\ensuremath{\alpha}\ensuremath{-}{\mathrm{Al}}_{2}{\mathrm{O}}_{3})$ have been investigated by means of periodic calculations in the framework of density functional theory…
Molecular dynamics simulations at 300 K in vacuum were used to study nanoparticle motion and structural changes during aggregation and coarsening of 3 nm sphalerite (ZnS) particles and atomic diffusion during the subsequent phase transformation. Interaction forces between atoms in different nanoparticles can induce tr…
Premature termination of growth, presumably because of catalyst deactivation, is an undesirable side effect of chemical vapor deposition of vertically aligned carbon nanotubes on predeposited metal catalyst films. The addition of ferrocene, an effective precursor for in situ Fe formation, was found to enhance carbon n…
Individual single-walled carbon nanotubes (SWNTs) produce highly bright images of the insulator surface around them when observed by scanning electron microscopy at low primary-electron voltage. We found that the insulator surface near SWNTs emits more secondary electrons due to electrons supplied through SWNTs connec…