Materials Literature
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The potential syntheses of pure nitrogen materials may involve photolysis of azide compounds. In this work, compressed solid samples of NaN 3 were photolyzed in gem anvil cells at pressures up to 5.0 GPa. Reaction rates and mechanisms for the photolytic processes were studied using single-shot time-resolved (microseco…
Continuous crack-free microporous silica membranes were fabricated on the ordered mesoporous sublayer and possessed very promising properties of high porosity and narrow pore size distribution. These membranes displayed very high permeances and selectivities well over the Knudsen diffusion limit for gas separation. Th…
The reactivity and equilibrium thermodynamic studies of tetra-p-sulfonatophenyl porphyrin rhodium hydride ([(TSPP)Rh-D]-4) with CO, aldehydes and olefins that produce formyl, alpha-hydroxyalkyl and alkyl complexes have been explored in water and compared with the related reactions in non-aqueous media.
Treatment of FeCl2 with the lithium derivative of [CH2(Ph2PNC6H2Me3-2,4,6)2] in THF and crystallisation from Et2O gave the ‘ate’ complex [{CH(Ph2PNC6H2Me3-2,4,6)2}Fe(μ-Cl)2Li(THF)(OEt2)] in which the iron is four-coordinate and the chlorides bridge to lithium. Treatment of [M{N(SiMe3)}2] (M = Mn, Fe, Co) with [CH2(Ph2…
A novel cadmium phosphate, Cd(2,2′-bipy)(H2PO4)2, has been hydrothermally synthesized in the presence of 2,2′-bipyridine (2,2′-bipy), which acts as a ligand. The structure consists of a network of CdO4N2 octahedra and H2PO4 tetrahedra, forming an infinite one-dimensional chain.
A study on the sequence and composition of copolyamides formed by activated exchange reactions occurring in the melt mixing of Ny6,10 and Ny6,6 is reported. Equimolar mixtures of Ny6,10, Ny6,6, and carboxyl-terminated Ny6,6 (Ny6,6-COOH) samples were melt mixed at different temperatures (290−310 °C) for different times…
We investigate the energy spectra of clean incommensurate double-walled carbon nanotubes, and find that the overall spectral properties are described by the critical statistics similar to that known in the Anderson metal-insulator transition. In the energy spectra, there exist three different regimes characterized by…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPreparation of Oriented Ultrathin Films via Self-Assembly Based on Charge Transfer Interaction between π-Conjugated Poly(dithiafulvene) and Acceptor PolymerXiaqin Wang, Kensuke Naka, Hideaki Itoh, Takashi Uemura, and Yoshiki ChujoVi…
Alumina-based refractory materials are extensively used in high-temperature applications, such as linings in waste incinerators. A significant problem affecting the performance of these materials is the presence of porosity and material inhomogeneity, which promote molten slag corrosion and chemical degradation. Singl…
Abstract The structure, morphology, and crystallization behavior of a random ethylene–propylene copolymer, containing 2 wt % ethylene sequences, are analyzed and compared with those of a plain polypropylene sample by means of optical and scanning microscopy, wide‐angle X‐ray scattering, and calorimetry. For the copoly…
Vapor deposition was used to synthesize surface-grafted polypeptides from a wide range of α-amino acids: γ-benzyl- l -glutamate, γ-methyl- l -glutamate, β-benzyl- l -aspartate, O -benzyl- l -serine, S -benzyl- l -cysteine, O -benzyl- l -tyrosine, l -tryptophan, l -phenylglycine, and l -phenylalanine. l -Alanine and l…
Blends of functionalized polystyrenes (3NPS) having three dimethylamino groups {N(CH 3 ) 2 } at one end, with sulfonic acid end-capped polyisoprenes (HO 3 SPI) were prepared in a ratio of N(CH 3 ) 2 /SO 3 H = 1. The morphology of these blends was studied by small-angle X-ray scattering and transmission electron micros…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTMicrophase Separation and Crystallization in an Asymmetric Diblock Copolymer: Coupling and CompetitionLiangbin Li, Yaelle Séréro, Michel H. J. Koch, and Wim H. de JeuView Author Information FOM-Institute for Atomic and Molecular Phy…
A series of novel mesogens have been prepared by a five-fold Sonogashira reaction of terminal acetylenes with a functionalized pentabromophenol derivative. The corresponding side-chain substituted polymers were prepared by an analogous polymer substitution reaction. The mesogens differ in the nature of the substituent…
Pulsed plasma-enhanced chemical vapor deposition from mixtures containing methylsilane (1MS), dimethylsilane (2MS), or trimethylsilane (3MS), systematically varied the methyl content in the resulting low dielectric constant films. The refractive index was found to depend strongly on methyl content but was relatively i…
We present a proposal for altering the electronic properties of single wall carbon nanotubes (SWNT's) through the chemical binding of atoms and molecules. This binding would be performed at Si substitutional defect sites, which would guarantee a high stability to the system. We argue that, by appropriately choosing th…
SUMMARY 1. Two experiments were performed with periphytic diatoms originating from the River Lot (France) and allowed to grow on clean substrata within indoor artificial streams. Three cadmium (Cd) levels (control, low Cd=10 μg L −1 and high Cd=100 μg L −1 ) were used to test the effects of Cd on (i) the settlement an…
The novel, functionalized heteropolymolybdates [RPMo(6)O(21)(O(2)CCH(2)NH(3))(3)](2)(-) (R = OH, CH(3), C(2)H(5), H) have been synthesized and characterized by IR, (31)P NMR spectroscopy, and elemental analysis. Single-crystal X-ray analysis was carried out on K(2)[HOPMo(6)O(21)(O(2)CCH(2)NH(3))(3)].8.5H(2)O, which cr…
Magnetoelectronic and optical properties of carbon nanotubes are, respectively, studied within the ${\mathrm{sp}}^{3}$ tight-binding model and the gradient approximation. They strongly depend on the magnitude and the direction of the magnetic field, the nanotube geometry (radius and chiral angle), and the Zeeman split…
The intrinsic ordering tendencies that limit ionic conduction in doped zirconia electrolytes are fully elucidated using first-principles calculations. A detailed analysis of nearly 300 yttria- and scandia-stabilized cubic-zirconia-ordered vacancy compounds reveals a delicate balance between competing elastic and elect…