Materials Literature
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Superparamagnetic particles offer a new way to probe the kinetics of adhesive processes. Two different scenarios of physical adhesion are studied. The thermal activation of van der Waals adhesion is well described by an Arrhenius model. In contrast, it is necessary to go beyond the Arrhenius description to understand…
The stability of the gyroid phase of diblock copolymers has been studied using combined oscillatory shear and small-angle neutron scattering (SANS) techniques. It is shown that the gyroid phase of polystyrene−polyisoprene (PS−PI) is unstable when exposed to combined large-amplitude and high-frequency shear deformation…
The gene phaPAh, encoding the protein phasin that is associated with poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) granule of Aeromonas hydrophila 4AK4, was cloned and characterized. Recombinant strains harboring additional copies of the phasin gene (phaPAh) and the polyhydroxyalkanoate (PHA) synthase gene (p…
A recent high pressure experiment on ${\mathrm{L}\mathrm{a}\mathrm{A}\mathrm{l}\mathrm{O}}_{3}$ has revealed that the compound is an exception for the ``general rule'' of displacive phase transition associated with zone-boundary phonons. In the present study, the experimental result is successfully confirmed by first…
Focused ion beam (FIB) lithography can be used to selectively close nanochannels in an ordered array on an anodic-alumina film, producing templates with the nanochannels arranged in custom-designed geometries (see Figure). Nanochannel closing can be monitored by in-situ FIB imaging. Nanodevices such as photonic-crysta…
The synthesis of a zinc porphyrin linked conjugated homopolymer is presented. The synthetic strategy employed a directional polymerization of 1-iodo-2,5-dioctyl-4‘-ethynyltolane in the presence of [10,20-bis(3,5-bis- tert -butylphenyl]-5,15-diethynylporphinato]zinc(II) ( 12 ) or [10,20-bis(3,5-bis- tert -butylphenyl]-…
Fixing of the anisotropic orientation of DAST nanocrystals , trans ‐4‐[4‐(dimethylamino)]stilbazolium p ‐toluenesulfonate, a well‐known organic second‐order nonlinear optical material, is described. The DAST nanocrystals were oriented in an acrylate monomer by an applied magnetic field and then immobilized by UV‐curin…
The way in which reagents are mixed can have a large influence on the product distribution of chemical reactions and the size distribution of particles of the solid product. To model effects of mixing on various scales on the course of chemical reactions and precipitation processes, a nonequilibrium multiple-time-scal…
Optically active polybithiophene is successfully prepared by electrochemical polymerization in a chiral nematic liquid crystal field. Polarizing and phase-contrast optical micrographs of the polymer reveal a well-resolved spiral morphology similar to the optical texture of the chiral nematic phase. Circular dichroism…
Various (linear, triarms, ABA or ABCBA type) amphiphilic multiblock copolymers containing acetal-protected sugars have been prepared by the coupling of an end-functionalized ROMP copolymer with poly(ethylene glycol) (PEG). The synthesis involves three key steps: (i) termination of the block ROMP copolymer prepared by…
The linear optical properties of semiconducting carbon nanotubes are dominated by quasi-one-dimensional excitons formed by single electron-hole pairs. Hence, the nonlinear response at high pump levels most likely leads to the formation of exciton complexes involving several electron-hole pairs. Such complexes would th…
Phosphoglycerate dehydrogenases exist in at least three different structural motifs. The first D-3-phosphoglycerate dehydrogenase structure to be determined was from Escherichia coli and is a tetramer composed of identical subunits that contain three discernable structural domains. The crystal structure of D-3-phospho…
Triflate salts of three (Pt(pip2NCN))2(mu-L)2+ (pip2NCNH = 1,3-bis(piperidylmethyl)benzene) dimers bridged by a series of nitrogen-donor ligands (L = pyrazine (pyz), 1,2-bis(4-pyridyl)ethane (bpa), trans-1,2-bis(4-pyridyl)ethylene (bpe)) are reported. These complexes have been fully characterized by 1H NMR spectroscop…
A detailed magnetic study has been carried out for the air-synthesized $R\mathrm{Ba}{\mathrm{Co}}_{2}{\mathrm{O}}_{5+\ensuremath{\delta}}$ $(R=\mathrm{La}\mathrm{Ho})$ cobaltites. $R\mathrm{Ba}{\mathrm{Co}}_{2}{\mathrm{O}}_{5+\ensuremath{\delta}}$ compounds exhibit complex magnetic behavior depending on the rare eart…
Metal nanowires coated with multilayer films of (TiO2/W12O41)3(PAN/SWNT)3PAN (12 nm thick; PAN: Polyaniline; SWNT: single-walled carbon nanotube) are synthesized using different, templated, layer-by-layer assembly techniques. Their I–V characteristics indicate a built-in p–n junction at the TiO2/PAN interface (rectifi…
The interplay between different types of disorder and electron-electron interactions in graphene planes is studied by means of renormalization group techniques. The low-temperature properties of the system are determined by fixed points where the strength of the interactions remains finite, as in one-dimensional Lutti…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTEnvironmentally Benign Polyester Synthesis by Room Temperature Direct Polycondensation of Dicarboxylic Acid and DiolAkinori Takasu, Yoshitaka Iio, Yoshika Oishi, Yuuki Narukawa, and Tadamichi HirabayashiView Author Information Deapa…
Abstract Polyamide‐6 (PA6)/montmorillonite (MMT) nanocomposites toughened with maleated styrene/ethylene butylene/styrene (SEBS‐ g ‐MA) were prepared via melt compounding. Before melt intercalation, MMT was treated with an organic surfactant agent. Tensile and impact tests revealed that the PA6/4% MMT nanocomposite fr…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTPolymer Blend Compatibilization by Gradient Copolymer Addition during Melt Processing: Stabilization of Dispersed Phase to Static CoarseningJungki Kim, Maisha K. Gray, Hongying Zhou, SonBinh T. Nguyen, and John M. TorkelsonView Author I…
Wurtzite-type single-crystalline AlN nanotubes with carbon coatings on the outer and inner surfaces (see Figure) were synthesized in bulk quantities through a substitution carbonitridation chemical process using multiwalled carbon nanotubes as templates. The AlN nanotubes are approximately several micrometers in lengt…