Materials Literature
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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…
We report the fabrication of novel metal oxide-coated polymeric nanofibers using the electrospinning technique. Polyacrylonitrile fibers were electrospun into a nonwoven fiber membrane. The membranes were subsequently immersed in an aqueous solution of metal halide salts and halogen scavengers at room temperature to a…
Octaaminophenylsilsesquioxane (OAPS) can serve as a nanosized building block for the construction of materials with nanometer control of the periodicity of the organic and inorganic components and bonding between components. We describe here the synthesis of a prototypical three-dimensional polyimide by reaction of OA…
Abstract Experimental data are reported on moisture diffusion and the elastoplastic response of an intercalated nanocomposite with vinyl ester resin matrix and montmorillonite clay filler at room temperature. Observations in diffusion tests showed that water transport in the neat resin is Fickian, whereas it becomes a…
We demonstrate the phase transfer of dodecylamine (DDA)-capped colloidal gold particles dispersed in an organic solvent into water containing the cationic surfactant, cetyltrimethylammonium bromide (CTAB). Vigorous shaking of the biphasic mixture results in the rapid phase transfer of DDA-capped gold nanoparticles fro…
Porphyrin architectures bearing a hydrogen-bonding scaffold have been synthesized. The H-bond pendant allows proton-coupled electron transfer (PCET) to be utilized as a vehicle for effecting catalytic O-O bond activation chemistry. Suzuki cross-coupling reactions provide a modular synthetic strategy for the attachment…