Materials Literature
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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…
The chemical effects induced by acoustic cavitation (popularly known as sonochemical effects) in aqueous medium are well-known and are attributed to the production of various radicals during bubble collapse. Under the influence of pressure variation due to acoustic wave, the bubble expands with the evaporation of wate…
An environmentally benign, entirely aqueous process is described to produce solid, crystallized silk fibers with diameters that are much smaller than natural silk fibers. The process entails three steps. First, submicron diameter fibers with a coaxial internal structure consisting of a silk core and poly(ethylene oxid…
Submicrometer fluorescent polystyrene (PS) particles have been synthesized via miniemulsion polymerization using CdSe/ZnS core-shell quantum dots (QDs). The influence of QD concentration, QD coating (either trioctylphosphine oxide (TOPO)-coated or vinyl-functionalized), and surfactant concentration on the polymerizati…
On the basis of ab initio calculations employing density functional theory (DFT) we investigate half metallic ferromagnetism in zinc-blende and wurtzite compounds composed of group I/II metals as cations and group V elements as anions. We find that the formation of ferromagentic order requires large cell volumes, high…
A new way of magnetization switching employing both the spin-transfer torque and the torque by a magnetic field is proposed. The solution of the Landau-Lifshitz-Gilbert equation shows that the dynamics of the magnetization in the initial stage of the switching is similar to that in the precessional switching, while th…
Electronic states of PrCoO 3 are studied using x-ray photoemission spectroscopy. The Pr 3d 5/2 core level and valence band (VB) were recorded using an Mg K α source. The core level spectrum shows that the 3d 5/2 level is split into two components of multiplicity four and two, respectively, due to coupling of the spin…
Transport properties of the good thermoelectric misfit oxide ${\mathrm{Ca}}_{3}{\mathrm{Co}}_{4}{\mathrm{O}}_{9}$ are examined. In-plane resistivity and Hall resistance measurements were made on epitaxial thin films which were grown on $c$-cut sapphire substrates using the pulsed laser deposition technique. Interpreta…
Near-infrared magneto-optical spectroscopy of single-walled carbon nanotubes reveals two absorption peaks with an equal strength at high magnetic fields (>55 T). We show that the peak separation is determined by the Aharonov-Bohm phase due to the tube-threading magnetic flux, which breaks the time-reversal symmetry an…