Materials Literature
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Electronic structures and magnetic properties of CaN and CaC in the zinc-blende (ZB) phase are systematically explored by using an accurate density-functional method. From the analysis of the spin-dependent density of states, band structure and magnetic moments, we predict that ZB-structure CaN and CaC at their respec…
Lead fluoroborate glasses were prepared by the melt-quenching technique and characterized in terms of (micro)structural and electrical properties. The study was conducted on as prepared as well as temperature- and/or electric field–treated glass samples. The results show that, in the as-prepared glassy-state materials…
Polyhedral oligomeric silsesquioxanes (POSS), functionalized with a single hexyl substituent, have been studied using molecular dynamics (MD) simulations based on a reactive interaction potential. This potential is designed for mixed covalent−ionic interactions and facilitates the charge transfer that is associated wi…
Abstract A series of addition cure poly(imide siloxane) resins were synthesized, incorporating various concentrations of α, ω‐bis(3‐aminopropyl) poly(dimethyl‐diphenylsiloxanes), and α, ω‐bis( p ‐aminophenyl) poly(dimethylsiloxane) into the formulated imide oligomer. Both carbon and glass fiber textile laminates were…
We studied the influence of post-treatment rinsing after the formation of self-assembled polyelectrolyte films made with the weak base poly(allylamine hydrochloride) (PAH) and the strong acid poly(styrene sulfonate) (PSS). The stability of the film was studied using optical fixed-angle laser reflectometry to measure t…
Highly oriented crystalline Zn(OH) 2 / p -aminobenzoic acid nanolaminates are fabricated on solid supports by cathodic electrodeposition. The growth condition is very mild, involving no organic solvent. The nanolaminates have superhydrophobic surface and are transparent in the range of the visible light. The nanolamin…
The structural and magnetic properties of three kinds of Fe oxide films—Fe3O4, a berthollide type of Fe oxide, and a composite of Fe3O4 and FeO—grown on MgO(001) substrates epitaxially at 423K by pulsed laser deposition were investigated by magnetoresistance measurement and grazing incidence x-ray diffraction. The Fe3…
We show that metallic secondary phase formation inside ZnO(0001) single crystals implant-doped with Ni at an atomic concentration of 5% can be suppressed. All the Ni ions are in the 2+ valence state after mild postannealing. The suppression is achieved by means of annealing of the crystals in high vacuum prior to impl…
Molecular mechanics calculations for in-plane stiffness, shear modulus, and the bending rigidity of single-walled carbon nanotubes are reported in this work through the calculations of the strain energy for carbon nanotubes and graphite sheets subjected to various types of loading. Elastic rod and plate theories are e…
Nickel doping has been found to produce weak room-temperature ferromagnetism (FM) in CeO2. The saturation magnetization (Ms) of the chemically synthesized Ce1−xNixO2 samples showed a maximum for x=0.04, above which the magnetization decreased gradually. For Ce1−xNixO2 samples with x⩾0.04, an activation process involvi…
Photoemission microspectroscopy on the layered misfit compound (PbS)1.13TaS2 provides direct evidence for Ta substitution into PbS layers as well as for Pb substitution into TaS2 layers. This metal cross substitution alters the charge balance between alternating layers and can explain the remarkable stability of (PbS)…
In this study, we investigate magnetic field annealing of Fe82.5Ga17.5 single crystal disks with two easy axes ([100] and [010]) in the plane of the disk. Magnetic annealing was conducted with a high magnetic field (H>12kOe) applied along the [100] or [010] easy axes of the demagnetized, as-grown, slow-cooled s…
Co-doped ZnO is a good dilute ferromagnetic semiconductor candidate with high Curie temperature. In this work, Zn 0.93 Co 0.07 O nanoparticles of about 5 nm in size were synthesized by the coprecipitation method. X-ray absorption fine structure spectra at both Co and Zn K-edges were acquired at an in situ and quick-sc…
Poly(L-lactide) (PLLA) with various alkyl ester chain end groups were synthesized by ring-opening polymerization of L-lactide in the presence of zinc alkoxide as a catalyst. The structural effect of chain end groups on the rate of enzymatic and nonenzymatic degradations for amorphous films of PLLA were investigated at…
This study investigated the influence of antiferromagnetic exchange interaction on magnetic properties of ZnMnO thin films grown on ZnO (0001¯) single-crystal substrates. Using pulsed laser deposition, ZnMnO films with Mn concentrations as high as 14.1at.% were prepared. Investigations revealed that the lattice consta…
Abstract Polymer blend nanocomposites have been developed by solution method using ethylene propylene diene terpolymer (EPDM), ethylene vinyl acetate (EVA‐45) copolymer, and organically modified layered silicate. Morphological investigation made by wide‐angle X‐ray diffraction and transmission electron microscopic ana…
Abstract Polyimide/multi‐walled carbon nanotube (PI‐MWNT) nanocomposites were fabricated by an in situ polymerization process. Chemical compatibility between the PI matrix and MWNTs is achieved by pretreatment of the carbon nanotubes in a mixture of sulfuric acid and nitric acid. The dispersion of MWNTs in the PI matr…
The influence of chirality on the interfacial bonding characteristics of single-walled nanotubes (SWNTs) reinforced polymer composites was investigated using molecular mechanics and molecular dynamics simulations. The simulations indicate that the interfacial bonding and shear stress between the SWNT and the poly(meth…
Solubilities of sebacic acid in binary ethanol + water solvent mixtures were measured by the dynamic method using a laser monitoring observation technique at a temperature range from (288 to 352) K. The mole fraction of ethanol in the solvent mixtures ranges from 0 to 1. The melting temperature and enthalpy of fusion…
We present a study of the electrochemical properties of a set of oligothiophenes including 2,5-bis(methylthio)thiophene (BMTT), its derivatives, and 5,5‘-bis(methylthio)-2,2‘-bithiophene (BMTbT). BMTbT, which possesses an α-coupled bithiophene capped with methylthio groups, exhibited two one-electron reversible proces…