Materials Literature
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Single-wall boron nitride nanotubes samples synthesized by laser vaporization of a hexagonal BN target under a nitrogen atmosphere are studied by UV and visible Raman spectroscopy. We show that resonant conditions are necessary for investigating phonon modes of BNNTs. Raman excitation in the UV (229 nm) provides prere…
Rigid p-octiphenyl rods were used to create helical tetrameric pi-stacks of blue, red-fluorescent naphthalene diimides that can span lipid bilayer membranes. In lipid vesicles containing quinone as electron acceptors and surrounded by ethylenediaminetetraacetic acid as hole acceptors, transmembrane proton gradients ar…
Solid state materials capable of storing hydrogen with high gravimetric (9 wt %) and volumetric density (70 g/L) are critical for the success of a new hydrogen economy. In addition, an ideal storage system should be able to operate under ambient thermodynamic conditions and exhibit fast hydrogen sorption kinetics. No…
Mixing it up: A ground spin state of S=83/2 is found in the mixed-valent manganese aggregate [MnIII12MnII7(μ4-O)8(μ3,η1-N3)8(HL)12(MeCN)6]2+ (H3L=2,6-bis(hydroxymethyl)-4-methylphenol; see polyhedral representation of the core) and arises through ferromagnetic coupling of all the metal centers.
Hierarchical self-assembly offers a powerful strategy for producing molecular nanostructures. Although widely used, the mechanistic details of self-assembly processes are poorly understood. We spectroscopically monitored a nucleation process in the self-assembly of p-conjugated molecules into helical supramolecular fi…
Four different types of chitosan-based nanocomposite films were prepared using a solvent-casting method by incorporation with four types of nanoparticles, that is, an unmodified montmorillonite (Na-MMT), an organically modified montmorillonite (Cloisite 30B), a Nano-silver, and a Ag-zeolite (Ag-Ion). X-ray diffraction…
This chapter contains sections titled: Introduction Primary Species in the Radiolysis of Sulfoxides The Final Products in the Radiolysis of Sulfoxides The Primary Species in the Radiolysis of Sulfones The Final Products in the Radiolysis of Sulfones The Radiolysis of Solutions of Poly(Olefin Sulfone)s References
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Recently, the breakup of spiral and concentric ringed spherulites has been observed experimentally in isothermal crystallization of poly(vinylidene fluoride) in its blends with ethylene vinyl acetate copolymer. To elucidate the phenomenon of spiral breakup in polymer spherulites, a theoretical simulation has been unde…
A ``minimal model'' of the Kondo-lattice type is used to describe a competition between the localization and metallicity in doped manganites and related magnetic oxides with Jahn-Teller ions. It is shown that the number of itinerant charge carriers can be significantly lower than that implied by the doping level $x$.…
A density functional theory of two-dimensional freezing is presented for a soft interaction potential that scales as inverse cube of particle distance. This repulsive potential between parallel, induced dipoles is realized for paramagnetic colloids on an interface, which are additionally exposed to an external magneti…
We report on a combined experimental and theoretical carbon and nitrogen K-edge near-edge x-ray absorption fine structure investigation on condensed metal-free phthalocyanine (H2Pc). Based on the results from improved virtual orbital calculations, all resonances in the experimental high-resolution data can be assigned…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Fatigue damage in face-centred cubic crystals by dislocation substructuring and crack growth was computationally simulated at the atomic scale. Single-crystal copper specimens with approximately 200 000 atoms and an initial crack were subjected to fatigue loading with a constant strain amplitude of ϵ max =0.01 and a l…
The magnetization of single crystal ${\mathrm{Gd}}_{5}{\mathrm{Ge}}_{4}$, which in a zero magnetic field orders antiferromagnetically at $128\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, indicates a reversible spin-flop transition when the magnetic field is along the $c$ axis and the absence of similar transformations when…
Electrochemical polymerization of N-vinyl carbazole (VC) on carbon nanotube (CNT) films was studied by cyclic voltammetry (CV) in LiClO4/acetonitrile solutions. Comparing the cyclic voltammograms recorded on a blank Pt electrode with those obtained when single- or multi-walled carbon nanotube (SWNT or MWNT) films were…
We found that the CutA1 protein, from Pyrococcus horikoshii (PhCutA1), has an extremely high denaturation temperature (T(d)) of nearly 150 degrees C, which exceeds the highest record determined by DSC by about 30 degrees C. To elucidate the mechanism of the ultra-high stability of PhCutA1, we analyzed the crystal stru…
We report the kinetics of photoinduced changes in absorption coefficient, optical band gap, and refractive index of $\mathrm{a}\text{\ensuremath{-}}{\mathrm{As}}_{2}{\mathrm{S}}_{3}$ films by measuring the time evolution of complete transmission spectrum between 400 and $800\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ at e…
Abstract A series of nonlinear optical chromophores 6 containing a substituted benzothiazole ring have been synthesized and characterized. 1,3‐Benzothiazoles 6 were prepared by treating various formyl derivatives of thienyl compounds with ortho ‐aminobenzenethiol in fair to excellent yields. These in turn were prepare…
We show, using the antiferromagnetic ferroelectric ${\mathrm{BaNiF}}_{4}$ as a model system, that the ``weak'' magnetic order arising from a polar structural distortion in a ferroelectric magnet due to the Dzyaloshinskii-Moriya interaction can be switched by an electric field. We calculate the magnitude of the resulti…