Materials Literature
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Electrical properties and crystallization behaviour of Si–Sb–Te films were studied and compared with those of a Ge 2 Sb 2 Te 5 film. The resistivity ratio of Si–Sb–Te films can reach 10 6 during the amorphous–crystalline transition, accompanied with a small thickness change (less than 3%). The melting temperature of S…
Dispersion of carbon nanotubes in a polymer matrix is one of the most critical issues in carbon nanotube/polymer composites. In this paper we discuss the considerable improvement in the dispersion of multiwalled carbon nanotubes (MWNTs) in poly(vinyl alcohol) (PVA) matrix that was attained through gum arabic treatment…
Samples of a nematic mixture of ZLI1132 and of a twisted nematic mixture composed of ZLI1132 and chiral inductor S811, including 1%-10% (w/w) 4-N,N-dimethylaminoazobenzene (DAB), (4'-nitro)-4-N,N-dimethylaminoazobenzene (NDAB), spiropyran (SP), or spirooxazine (SO) were irradiated to produce the photochromic transform…
The mechanical properties of polycarbonate film embedded with carbon nanofibers were studied based on plasma surface modification of carbon nanofibers by the use of polystyrene. The nanofiber surfaces were modified by various processing conditions including plasma polymerization power, nanofiber concentration, and ult…
Abstract Polyhedral oligosilsequioxane (POSS) tethered aromatic polyamide nanocomposites with various POSS fractions were prepared through Michael addition between maleimide‐containing polyamides and amino‐functionalized POSS. The chemical structures of the polyamide–POSS nanocomposites were characterized with Fourier…
Lanathum (La)‐doped Fe3O4 magnetic nanoparticles were prepared in aqueous solution at room temperature, then La‐doped Fe3O4‐polyaniline (PANI) nanocomposites containing a dispersion of La‐doped Fe3O4 nanoparticles were synthesized via in‐situ polymerization of aniline monomer. The structure and properties of the synth…
Abstract Diblock copolymer poly(1,1,3, N,N ′‐pentamethyl‐3‐vinylcyclodisilazane)‐ block‐ polystyrene (polyVSA‐ b ‐polySt) and triblock copolymer poly(1,1,3, N,N ′‐pentamethyl‐3‐vinylcyclodisilazane)‐ block‐ polystyrene‐ block ‐poly(1,1,3, N,N ′‐pentamethyl‐3‐vinylcyclodisilazane) (polyVSA‐ b ‐polySt‐ b ‐polyVSA), cons…
The power factor measurement is widely used in the evaluation of bushing insulation conditions in the field. Some measurement issues occur in the field tests which give abnormal readings of bushing C/sub 1/ and/or C/sub 2/ power factors. This paper provides an engineering analysis of the possible measurement issues in…
This paper introduces a novel technique for modeling, in the time domain, a power transformer with nonlinear and hysteretic behavior. The model is particularly suitable for harmonic or protection studies where the transformer is driven into the nonlinear regime. The technique uses a single-phase two-winding transforme…
PdZn (1:1) alloy is assumed to be the active component of a promising catalyst for methanol steam reforming. Using density functional calculations on periodic supercell slab models, followed by atomistic thermodynamics modeling, we study the chemical composition of the surfaces PdZn(111) and, as a reference, Cu(111) i…
The thermo-chemical expansion of Solid Oxide Fuel Cell (SOFC) component materials exposed to different partial pressures of oxygen (PO2) was studied and a model developed that fits the resulting data. Thermo-chemical expansion is made up of two parts, the expansion due to temperature and the expansion due to changes o…
The goal of this research is to increase the metal-organic concentration in Kapton-like polyimides (PIs) to achieve increased atomic oxygen (AO) resistance while retaining desirable film properties. Co-polyamic acid (PAA) precursors were prepared using a novel polymer building block, mellitic acid dianhydride (MADA),…
Abstract A series of Al(III) and Sn(II) diiminophosphinate complexes have been synthesized. Reaction of Ph(ArCH 2 )P(NBu t )NHBu t (Ar = Ph, 3 ; Ar = 8‐quinolyl, 4 ) with AlR 3 (R = Me, Et) gave aluminum complexes [R 2 Al{(NBu t ) 2 P(Ph)(CH 2 Ar)}] (R = Me, Ar = Ph, 5 ; R = Me, Ar = 8‐quinolyl, 6 ; R = Et, Ar = Ph,…
Recent molecular dynamics simulations of nanocrystals have illustrated the importance of stacking fault width for mechanical behavior and microstructure. Stacking fault (SF) width is a balance between elastic strain energy and the SF energy. While the latter is a material constant, the former strain energy may vary du…
A low‐fire Ni–Cu–Zn ferrite+dielectric ceramic composite and its multilayer integrated laminate, which can be densified at temperatures below 900°C, is prepared. To densify Ni–Cu–Zn ferrite at low temperatures, the dielectric needs to contain an effective sintering flux of Bi 2 O 3 or PbO to the Ni–Cu–Zn ferrite. This…
We combine a density functional theory (DFT) treatment of capillary evaporation in a cylindrical pore with the morphometric approach in order to study the formation and breaking of bubbles in a hydrophobically lined part of a cone. The morphometric approach, in which the grand potential of a system is described in fou…
We present first-principles density-functional calculations using the local density approximation to investigate the structural instability of cubic perovskite ${\mathrm{BaBiO}}_{3}$. This material might exhibit charge disproportionation and some evidence thereof has been linked to the appearance of an additional four…
Extensive studies in the past have focused on precise calculations of the nonlinear-optical susceptibility of thousands of molecules. In this work, we use the broader approach of considering how geometry and symmetry alone play a role, irrespective of molecular constraints. We investigate the nonlinear optical respons…
Abstract The conformational changes occurring in isotactic polypropylene during the melting and crystallization processes have been carefully investigated using FT‐Raman spectroscopy at temperatures below, at, and above the polymer melting point. Results confirmed the retention of some crystallinity up to +210 °C, whi…
We report diffusion in the tunneling spectra of isolated, ligand-stabilized undecagold (Au11) clusters immobilized by attachment to alpha,omega-alkanedithiolate tethers inserted into alkanethiolate self-assembled monolayers. We use scanning tunneling microscopy and spectroscopy at cryogenic (UHV, 4 K) conditions to me…