Materials Literature
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Abstract The fabrication of a conducting polyaniline (PANi) matrix based on a template of polystyrene (PS) latex is of interest from an academic and application viewpoint. In this Full Paper, we propose a distinctly novel strategy, which involves swelling followed by diffusion and polymerization at the interface, to f…
Mn 2+ -doped x BaO·6Al 2 O 3 and BaMgAl 10 O 17 phosphors were prepared by solid-state reaction. The investigation of vacuum ultraviolet (VUV) excitation spectra of these phosphors exhibits that 0.82BaO·6Al 2 O 3:Mn 2+ and BaMgAl 10 O 17:Mn 2+ have a stronger absorption than BaO·6Al 2 O 3:Mn 2+ at about 147 nm. The em…
Abstract Transparent dielectric thin films of MgO has been deposited on quartz substrates at different temperatures between 400 and 600°C by a pneumatic spray pyrolysis technique using Mg(CH 3 COO) 2 ·4H 2 O as a single molecular precursor. The thermal behavior of the precursor magnesium acetate is described in the re…
An uneven split: Cooperative CuII and BIII metalation of meso-heptakis(pentafluorophenyl)[32]heptaphyrin (1) triggers an extrusion reaction to produce BIII meso-tris(pentafluorophenyl)[14]subporphyrin (2) along with a CuII porphyrin (3-Cu). Subporphyrin 2 exhibits unique optical properties that reflect the rotational…
In this work we present the characterization of PAMAM dendrimers from generation two (G2) up to ten (G10) with a focus on the G5−G10 dendrimers with matrix-assisted laser desorption/ionization linear mass spectrometry (MALDI−MS) and nanoelectrospray gas-phase electrophoretic mobility molecular analysis (nES−GEMMA). Fo…
This work demonstrates a simple process to form insoluble poly(3,4-propylenedioxythiophene) ( Poly[ProDOT] ) films by defunctionalization of a soluble form, which is useful in the fabrication of multilayer polymer devices. Three new ester disubstituted Poly[ProDOTs], soluble in common organic solvents, including chlor…
With a progress of an aging society with fewer children, an introduction of robots for family use is expected. Focusing on laundry cleanup by robots, we are studying clothing classification for folding by a dual manipulator. Fabrics vary greatly in handling, making it difficult for robots to recognize and handle them…
Caged neurotransmitters are useful photochemical tools for selective stimulation of synapses and other transmitter receptors. Before illumination, the caged compound is biologically inert. Photolysis breaks a covalent bond, liberating the caged neurotransmitter. Release can be rapid, so the
In the simple perovskite oxide $\mathrm{Pb}{\mathrm{Zr}}_{1\ensuremath{-}x}{\mathrm{Ti}}_{x}{\mathrm{O}}_{3}$ (PZT), an excellent piezoelectric response was obtained in the vicinity of a morphotropic phase boundary (MPB) between the ferroelectric monoclinic $({F}_{M})$ and rhombohedral $({F}_{R})$ phases. In order to…
Supramolecular gels exhibit potential applications in the areas of sensors, nanodevices, drug and catalyst carriers, and so on. To develop a novel organogel with a multiresponse, we designed a component molecule bearing a pyridyl group for metal coordination and an amide group for the formation of intermolecular hydro…
Recombinant spider-silk proteins are used to produce responsive microcapsules with good mechanical and chemical stability (see figure). Emulsion interfaces are harnessed to induce the controlled self-assembly of these proteins into predominantly β-sheet configurations, resulting in a mechanically stable thin polymer s…
Abstract The effect of dispersant structures for dispersing single‐walled carbon nanotubes (SWCNTs) is investigated. The monomer 3‐hexylthiophene is used as the starting material for the development of a series of oligomers that are used to disperse SWCNTs in an organic solvent. The series is obtained by varying the n…
Monoclinic hydromagnesite (Mg 5 (CO 3 ) 4 ·(OH) 2 ·4H 2 O) flower-like structures of 2−3 μm diameter have been synthesized at room temperature by a simple precipitation method without using any template, catalyst, or surfactant. The as-synthesized flowers were further calcined at various temperatures to prepare monodi…
We report the remarkable surface behavior of class II hydrophobin proteins HFBI and HFBII from Trichoderma reesei and the resulting effect that these proteins have on the stability of air bubbles to the process of disproportionation. The surface properties were studied using surface tensiometry and surface shear rheol…
We present a thorough theoretical assessment of the stability of non-collinear spin arrangements in small palladium clusters. We generally find that ferromagnetic order is always preferred, but that antiferromagnetic and non-collinear configurations of different sorts exist and compete for the first excited isomers. W…
A scaling relation of the anomalous Hall effect recently found in a ferromagnetic semiconductor (Ti,Co)O_2_ is compared with those of various ferromagnetic semiconductors and metals. Many of these compounds with relatively low conductivity sigma_xx_ < 10^4 ohm^-1 cm^-1 are also found to exhibit similar relation: anoma…
In analogy with optical near-field scanning methods, we use tapered dielectric waveguides as probes for a millimeter wave vector network analyzer. By scanning thin samples between two such probes we are able to map the spatially varying dielectric properties of materials with sub-wavelength resolution; using a 150 GHz…
Raman spectra of thin solid electrolyte films obtained by sputtering a lithium sulfate target in nitrogen plasma are measured and compared to ab initio electronic structure calculations for clusters composed of 28 atoms. Agreement between measured and calculated spectra is obtained when oxygen atoms are replaced by ni…
The finite basis optimized effective potential (OEP) method within density functional theory is examined as an ill-posed problem. It is shown that the generation of nonphysical potentials is a controllable manifestation of the use of unbalanced, and thus unsuitable, basis sets. A modified functional incorporating a re…
We uncover a new pathway towards multiferroicity, showing how magnetism can drive ferroelectricity without relying on inversion symmetry breaking of the magnetic ordering. Our free-energy analysis demonstrates that any commensurate spin-density-wave ordering with a phase dislocation, even if it is collinear, gives ris…