Materials Literature
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Abstract Gadolinium Chloride (GdCl 3 ) has been employed as dopant to synthesize conductive polyaniline (PANI) using chemical method. The resulting products were characterized using infrared spectroscopy, UV–vis spectra, scanning electron microscope, differential thermal analyzer, and X‐ray diffraction. It was found t…
Abstract Copper‐embedded low‐density polyethylene (LDPE) composites were fabricated using different copper concentrations in the polymer matrix. The copper particles were spherical with a mean particle size between 200 and 300 nm. All the samples were compacted under pressure and melted. The LDPE matrix was analyzed u…
Abstract Effect of fiber compression on flexural modulus of the natural fiber composites was examined. The kenaf, bagasse, and polypropylene were mixed into pellets, and composites were fabricated by injection molding. To predict flexural modulus of the composites, the Young's modulus of kenaf and bagasse fiber were m…
Syntheses of CdTe/CdSe type-II quantum dots (QDs) using CdO and CdCl2 as precursors for core and shell, respectively, are reported. Characterization was made via near-IR interband emission, transmission electron microscopy (TEM), energy dispersive spectroscopy (EDX), and X-ray diffraction (XRD). Femtosecond fluorescen…
The structure of calcium molybdate was studied by means of synchrotron based high-resolution powder diffraction methods in the temperature range $12--300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The scheelite structure type was confirmed for $\mathrm{Ca}\mathrm{Mo}{\mathrm{O}}_{4}$ in the temperature region investigated…
Abstract An analysis is given of various aspects of the design of crystallization‐based separation processes. A literature review is included for each of the different themes treated in the study. Special emphasis is placed on the usefulness of the relative composition diagram as a tool for identification of possible…
A general strategy for the preparation of well-defined diblock copolymers combining a random cascade-branched dendritic (i.e., hyperbranched) and a linear block has been developed. The strategy is based on a linear poly(styrene- b -butadiene) (PS- b -PB) diblock copolymer with high molecular weight PS block and short,…
Dielectrophoresis has received considerable attention for separating nanotubes according to electronic types. Here we examine the effects of surface conductivity of semiconducting single walled carbon nanotubes (SWNT), induced by ionic surfactants, on the sign of dielectrophoretic force. The crossover frequency of sem…
Abstract This article studies the quiescent annealing of three different cocontinuous polystyrene/high‐density polyethylene blends modified with two types of interfacial agents of widely different efficacies. Quantitative analysis of phase growth was obtained using mercury porosimetry. In a previous work, it was shown…
Water-dispersible and uniform tubular nanocarbons with a diameter of about 10 nm were synthesized by the template method without any additional treatment after the synthesis. Since one end of each tubular nanocarbon is always open but another end is closed, the nanocarbons look like a “test tube”. It was found that th…
Abstract A negative‐type photosensitive polyimide (PSPI) based on poly(amic acid) (PAA) and a photo‐base generator (PBG) has been developed. PAA‐2, the polyimide precursor, was prepared from oxydianiline (ODA) and 4,4′‐biphthalic dianhydride (BPDA) in N,N‐dimethylacetamide (DMAc), and used directly for lithographic ev…
The novel manganese(III) complexes PPh4[Mn(mal)2(H2O)2] (1) and AsPh4[Mn(mal)2(H2O)2] (2) (PPh4+ = tetraphenylphosphonium cation, AsPh4+ = tetraphenylarsonium cation, and H2mal = malonic acid) have been prepared, and the structure of 2 was determined by X-ray diffraction analysis. 2 is a mononuclear complex whose stru…
The hydrogenation reactions of ethene, propene, and toluene were used as probes of the catalytic properties of small clusters of rhodium (Rh6) and of iridium (Ir4 and Ir6) (as well as of larger aggregates of these metals) on oxide supports (gamma-Al2O3, MgO, and La2O3). The catalysts were characterized in the working…
Highly chiral liquid crystals: Blue phases (see picture), which are stable in the temperature range: 40–50 °C, are highlighted in this contribution. These liquid-crystal mesophases show a great potential for exciting electro-optical applications.
We demonstrate a simple route to making hierarchically porous MnO. Macropores in Mn3O4 are induced through a process of powder sintering. The loss of volume associated with the reduction of Mn3O4 to MnO results in the formation of mesopores in the walls of a macroporous monolith of MnO. The mesopores are regenerative,…
The handling, dispersion, manipulation, and functionalization of carbon nanotubes and nanopipes often require the use of solvents. Therefore, a good understanding of the wetting properties of the carbon nanotubes is needed. Such knowledge is also essential for the design of nanotube-based nanofluidic devices, which ho…
An effective method was proposed to remove obstinate boron nitride phase impurities in boron nitride nanotubes (BNNTs). The method is based on strong interactions between BNNTs and a conjugated polymer wrapping them and significant weight and size difference between BNNTs and impurities. The as-grown samples and purif…
We study the liquid-crystalline phase behavior of a concentrated suspension of helical flagella isolated from Salmonella typhimurium. Flagella are prepared with different polymorphic states, some of which have a pronounced helical character while others assume a rodlike shape. We show that the static phase behavior an…
The restored strain energy in $\mathrm{Pb}{\mathrm{Zn}}_{1∕3}{\mathrm{Nb}}_{2∕3}{\mathrm{O}}_{3}$ (PZN) and $9%\mathrm{Pb}\mathrm{Ti}{\mathrm{O}}_{3}$-doped PZN (PZN-9%PT) relaxor crystals has been studied by means of acoustic emission (AE). Two types of AE activity signals have been recorded: (i) related to temperatu…
Composition, crystal structures, polymorphic transformations, and stability of the thermoelectric material known in the literature as “Zn 4 Sb 3 ” have been studied on a polycrystalline sample and Bi-flux-grown single crystals using X-ray diffraction techniques, resistance, and Seebeck coefficient measurements at vari…