Materials Literature
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In this study, a novel application of radical addition-coupling polymerization (RACP) for synthesis of hyperbranched polymers is reported. By Cu/PMDETA-mediated RACP of 2-methyl-2-nitrosopropane with trimethylolpropane tris(2-bromopropionate) or a bromo-ended 3-arm PS macromonomer, two types of hyperbranched polymers…
Lead zirconate-titanate (PZT) thick films of perovskite structure Pb(Zr x Ti 1-x )O 3 were fabricated on the curved surface of IN738 nickel-based supper alloy substrate up to 15 µm thickness using sol–gel deposition technique without polyvinylpyrrolidone. The films were heated at 200℃ with 10 wt% excess PbO, pyrolyzed…
We analyze the electronic properties of bilayer graphene with Bernal stacking and a low concentration of adatoms. Assuming that the host bilayer lies on top of a substrate, we consider the case where impurities are adsorbed only on the upper layer. We describe nonmagnetic impurities as a single orbital hybridized with…
Three Zn(II) tetraphenylporphyrins (ZnTPP) were synthesized to study the influence of a molecular dipole on the energy level alignment of a chromophore bound to a metal oxide semiconductor: ZnTPP-PE(DA)-IpaOMe (1), ZnTPP-PE-IpaOMe (2), and ZnTPP-PE(AD)-IpaOMe (3). Each contained a rigid-rod linker made of a p-phenylen…
Laser Assisted Etching (LAE) technique with short laser wavelength was used to provide a gradient-porosity porous silicon (GPSi) layer. Morphological aspects, reflectivity and photoelectric properties of (GPSi) layer were studied based on a bare solar cell substrate (p-n). The results show that the (GPSi) layer has a…
The valence- and conduction-band O 2p partial densities of states (DOSs) in a typical oxide glass, SiO2, and the corresponding α-quartz crystal were investigated by soft X-ray emission spectroscopy and soft X-ray absorption spectroscopy, respectively. Both of the obtained spectra for glassy and crystal SiO2 surprising…
RATIONALE: Ge(x)As(y)Te(z) glasses have a broad window of optical transparency and high refractive index which make them promising for applications in the infrared region. The aim of this work is to reveal structural motifs which could be present during the fabrication of Ge-As-Te thin films by plasma deposition techn…
The impact of the macrodipole of peptide helices on catalysis was examined using density functional theory calculations. Transition state structures for histidine-containing polyalanine nucleophilic catalysts adding to carbonyls were computed, and the impact of both global and local noncovalent interactions was assess…
The present work seeks to investigate microstructure, mechanical properties, and flame retardancy of polyurethane/nanoclay flexible foam composites. In this regard, we prepared various nanocomposites with and without nanoclay and observed the resulting morphologies to correlate them with the other corresponding charac…
Smart susceptors are being developed for use as tooling surfaces in molding machines that use apply electro-magnetic induction heating to mold and form plastics or metal powders into structural parts, e.g., on aerospace and automotive manufacturing lines. The optimal magnetic materials for the induction heating proces…
Despite poly(vinyl chloride) (PVC) being one of the most useful materials available to the fabricator, its inadequate disposal has contributed to strong noneconomic issues based on the allegedly evil effects of chlorine. In this study, we examined the influence of adding starch, a biodegradable bioplastics, to mixture…
Two new amide chloride phases, with approximate stoichiometries Li7(NH2)6Cl and Li6Mg0.5(NH2)6Cl, have been identified by powder X-ray diffraction, and their hydrogen storage properties studied. Both phases released hydrogen on reaction with LiH at a lower temperature than observed for lithium amide, and ammonia relea…
Abstract Abstract. In the crystal structure of the clathrate‐I K8LixGe44–x/4□2–3x/4, the K atoms fill the polyhedral cages of a host framework formed by Li and Ge atoms. The phase has been obtained in two forms, at elevated temperatures with space group Pm$\bar{3}$ n, and at low temperatures with a 2a0 × 2a0 × 2a0 sup…
The effects of addition of synthesized organic-suspension silver nanoparticles on the crystallization and thermal stability of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) were studied by transmission electron microscopy (TEM), differential scanning calorimetry (DSC), wide-angle X-ray diffraction (XRD), UV-Vis…
The present work is aimed at studying the fracture behavior of a hydroxyl-terminated polybutadiene solid rocket propellant. A fracture mechanics method based on the integral was adopted to evaluate the material’s resistance against crack initiation and propagation with the auxiliary of a high-speed microscopic camera…
In this research, we studied the preparation of nanochitosan from the addition of potassium persulfate as an initiator for monomer polymerization and monocarboxylic acid—namely acetic acid, lactic acid, and formic acid—to a chitosan solution. To obtain the dried form of chitosan nanoparticles, we investigated the effe…
Inspired by a Newton's cradle device and interested in the development of redox-controllable bimetallic molecular switches, a mixed-valence thallium(III)/thallium(I) bis-strap porphyrin complex, with Tl(III) bound out of the plane of the N core and Tl(I) hung to a strap on the opposite side, was formed by the addition…
We study the linear and nonlinear acoustic response of SrTiO3 across its ferroelastic transition at Ta=105 K by time domain Brillouin scattering. Above Ta we observe that for a strain amplitude of ∼0.18% the sound velocity for compressive strain exceeds the tensile strain velocity by 3%. Below Ta we find a giant slowi…
Rice husk is a potential source for renewable energy and silica. To extract the maximum amount of silica, usually the rice husk is treated with strong acids that burn the organic part leaving behind a black residue. In this research, sulfuric acid is used as an oxidizing agent. Efforts are focused to find out more abo…
Nitrogen doping in carbon nanotube (CNT) fibers using pyrolyzed ionic liquid induced interfacial hydrogen bonding between individual CNTs, enhancing mechanical properties and electrical conductivity simultaneously. In particular, the nitrogen doped CNT fiber using the ionic liquid BMI-I exhibited about 104%, 714%, and…