Materials Literature
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To understand the role of electron-phonon interaction in superconducting ${\mathrm{MgCNi}}_{3}$ we have performed density-functional based linear response calculations of its lattice dynamical properties. A large coupling constant $\ensuremath{\lambda}=1.51$ is predicted and contributing phonons are identified as disp…
Exposure of heavily B-doped $(2\ifmmode\times\else\texttimes\fi{}{10}^{19}--4\ifmmode\times\else\texttimes\fi{}{10}^{20}{\mathrm{cm}}^{\ensuremath{-}3})$ diamond to a deuterium plasma results in the formation of passive B-D complexes which are bound with a dissociation barrier of 2.5 eV. In heavily doped material ther…
Two soft chemical processes enabling the low-temperature synthesis of γIII-CoOOH are reported. Both processes consist of an oxidation reaction of αII-Co(OH) 2 performed either in dry conditions (ozonation) or in solution. The γIII-CoOOH phase is usually prepared using a ceramic step process, which hinders its synthesi…
Hexagonal nanocrystalline Fe2P has been synthesized via a solvothermal route at a relatively low temperature of 180 °C. X-Ray diffraction (XRD), X-ray photoelectron spectra (XPS) and transmission electron microscopy (TEM) were used to investigate the phase, composition, and morphology of the final crystallized product…
A combination of transmission electron microscopy (TEM) and atomic force microscopy (AFM) revealed that a secondary ammonium hydrochloride of a peptidic lipid, in which an l -prolyl- l -prolyl- l -proline fragment is coupled with an l -glutamate derivative carrying two long alkyl chains, self-assembles in water to for…
Four kinds of 1:1 and 1:3 salts of 3-[4-(trimethylammonio)phenyl]-1,5-diphenyl-6-oxoverdazyl radical cation ([1](+)) and its mono- and dimethyl derivatives ([2](+) and [3](+)) with Ni(dmit)(2) anions (dmit = 1,3-dithiol-2-thione-4,5-dithiolate) ([1](+)[Ni(dmit)(2)](-) (4), [2](+)[Ni(dmit)(2)](-) (5), [3](+)[Ni(dmit)(2…
Enzymatic ring-opening polymerization of epsilon-caprolactone by various lipases was investigated in toluene at various temperatures. The determination of molecular weight and structural identification was carried out with gel permeation chromatography and proton NMR, respectively. Among the various lipases employed,…
The NMR and EPR spectra for three complexes, iron(III) octamethyltetraphenylporphyrin bis(4-cyanopyridine) perchlorate, [FeOMTPP(4-CNPy)(2)]ClO(4), and its octaethyl- and tetra-beta,beta'-tetramethylenetetraphenylporphyrin analogues, [FeOETPP(4-CNPy)(2)]ClO(4) and [FeTC(6)TPP(4-CNPy)(2)]ClO(4), are presented. The crys…
We have determined the first wide-range conductivity spectra of a mixed alkali glass system, extending from 10(-3) Hz to 1.3 THz. We report on a new mixed alkali effect in the ac conductivity that is evident even if the low-frequency contributions (linked to hopping motions of the mobile cations) are removed from the…
A novel sol−gel-assisted solid-state synthetic method has been developed to prepare pure and transition-metal-substituted cryptomelane 1D nanomaterials with controlled particle sizes. Different cross-linking reagents (PVA, glycerol, or glucose) have been used to prepare precursor powder materials and to produce nanoro…
The magnetic state of hexagonal close-packed iron has been the subject of debate for more than three decades. Although Mössbauer measurements find no evidence of the hyperfine splitting that can signal the presence of magnetic moments, density functional theory predicts an antiferromagnetic (afm) ground state. This di…
A series of graphite nanofibers (GNFs) that were subjected to various pretreatments were used to determine how modifications in the carbon structure formed during either synthesis or pretreatment steps results in active or inactive materials for hydrogen storage. The nanofibers possessing a herringbone structure and a…
Lactose is the only soluble carbon source which can be used economically for the production of cellulases or heterologous proteins under cellulase expression signals by Hypocrea jecorina (=Trichoderma reesei). Towards an understanding of lactose metabolism and its role in cellulase formation, we have cloned and charac…
Advanced modelling techniques have been used to investigate the defect properties of the LaGaO3 ionic conductor on the atomic-scale. The present study addresses a variety of topics, but focuses on the site-selectivity of a wide range of dopants, the influence of A-site deficiency, the nature of dopant–vacancy associat…
We report the first determination of the slip coefficient for tubular carbon structures that have been produced by chemical vapor deposition on a porous alumina substrate with nominal pore diameters of 200 nm. A uniform 20−30 nm thick carbonaceous coating was formed over the pores. The permeability of the porous alumi…
Organic second-order nonlinear optical (NLO) materi-als have received increasing interests due to their potential applications in high-speed electrooptic (E-O) devices with very broad bandwidth (up to 150 GHz) and low driving voltages (<1 V).1 In the pursuit of a new generation of highly efficient NLO polymers…
A new synthetic strategy was developed to prepare polyphosphazenes with second-order nonlinear optical chromophore in which sulfonyl groups are the acceptors. Thus, polyphosphazenes P1 and P2 that contain aniline or indole groups as side chains were obtained from a highly reactive macromolecular intermediate, poly(dic…
Polymeric films with surface energies as low as 10 mN/m were prepared from a mixture of a hydroxyl-end-capped solventless liquid oligoester (SLO), a blocked polyisocyanate, and a novel fluorinated blocked isocyanate (F n B-NCO; the ratio of the fluorinated tail and the caprolactam blocking group: 1:1), with less than…
Pt nanowires are synthesized in organic−inorganic mesoporous silica HMM-1 (channel diameter 3 nm) by photoreduction, and the formation mechanism and isolation of the wires have been studied. UV-irradiation of HMM-1 impregnated with H 2 PtCl 6 for 48 h in the presence of adsorbed water and methanol leads to the formati…
Shear-induced coalescence was studied in immiscible blends of polydimethylsiloxane ~PDMS! and polyisoprene ~PI! with a droplet-matrix morphology, using both rheology and scanning electron microscopy. Dynamic moduli of the blends compatibilized with different amounts of a PDMS–PI diblock were measured. The experimental…