Materials Literature
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Abstract Double bonds reactive with active radical species were introduced onto the surface of carbon yarn by the plasma‐graft polymerization of adipic acid divinyl ester and ethylene glycol dimethacrylate monomers to increase the adhesive strength in the interface between the carbon yarn and a vinyl ester resin. The…
We calculate the excitonic transition energies and exciton binding energies in ZnO/Mg x Zn 1- x O quantum-well heterostructures with Mg composition x varied from 0.08 to 0.36. The effect of the exciton-phonon interaction on the exciton binding energies is taken into account in the model. For the ZnO/Mg 0.12 Zn 0.88 O…
Magnetic, transport, and electron magnetic resonance properties of ${\mathrm{Pr}}_{0.8}{\mathrm{Ca}}_{0.2}{\mathrm{MnO}}_{3}$ single crystals have been investigated. Two ferromagnetic transitions observed at ${T}_{C1}\ensuremath{\approx}130\mathrm{K}$ and ${T}_{C2}\ensuremath{\approx}60\mathrm{K},$ denote a long range…
Abstract Series of gel electrolytes based on thermoplastic polyurethane (PU) with different organic additives were prepared and studied. Structural characterization was carried out by differential scanning calorimetry (DSC), dynamic mechanical analyzer (DMA), scanning electron microscopy (SEM), and atomic force micros…
The present work deals with the comparative application of the CPSM (corrugated pore structure model), the α s plot and the pore connectivity methods for pore structure analysis and especially the detection of microporosity of a category of montmorillonite clays pillared with LaNiO x binary oxide. A quite good agreeme…
Abstract The compatibilizing effect of mercapto‐modified ethylene–vinyl acetate (EVALSH) was investigated in vulcanized nitrile rubber (NBR)/ethylene–vinyl acetate (EVA) copolymer blends. EVALSH increased the ultimate tensile strength, mainly in blends containing larger amounts of NBR. In addition, an accelerating eff…
Periodic spindle-unit boron nitride (BN) nanotubes with buglelike open-end tips have been found in the product by nitriding Fe-B nanoparticles at 1100 °C with a mixture of nitrogen and ammonia gas. The microstructure was well-characterized by high-resolution transmission electron microscopy (HRTEM) and energy-dispersi…
Field emission of electrons from narrow-band-gap and wide-band-gap one-dimensional nanostructures were studied. N-type silicon substrates enhanced the emission from the low-band-gap silicon nanowires and carbon nanotubes, whereas p-type substrates were a better choice for field emission from wide-band-gap silicon carb…
A new type of highly conductive self-doping polyaniline, MPS−Pan, containing a sulfonic acid moiety covalently bonded to the polymer backbone through an electron-donating propylthio linkage has been successfully prepared via a novel concurrent reduction and substitution route. At a similar self-doping level, the resul…
Abstract Phenolic resin–layered silicate nanocomposites (PLSNs) were synthesized by melt intercalation with linear novolac resin (P1) and organosilicates such as montmorillonite modified by benzyldimethyloctadecylammonium (C18BM) and by bis(2‐hydroxy‐ethyl)methyl tallow ammonium (THEM). The PLSNs were prepared by a se…
Cyclodextrin inclusion for self-aggregative sensitizers was found to improve quantum yields for photoinduced energy/electron transfer by the isolation of sensitizers in an aqueous solution. In water, cyclodextrin derivatives can prevent self-aggregation of sensitizers, which decreases the total quantum yields for phot…
The local dynamics of the low-T(g) component in a polymer blend, dynamically asymmetric poly(styrene)-poly(vinyl methyl ether) (PS-PVME), is studied below the glass transition, via dielectric relaxation spectroscopy. A particular attention has been paid to blends with a high PS content (PS weight fraction higher than…
Novel meso-substituted cationic porphyrins have been synthesized as potential photodynamic agents. 5,10-bis(4-Acetamidophenyl)-15,20-bis(4-methylphenyl)porphyrin 1 was prepared using a modification of the Alder-Longo procedure. However, two different approaches were compared in the synthesis of 5-(4-trifluorophenyl)-1…
Excess intercalation of cationic surfactants into Na + -montmorillonites (MMTs) was investigated in organically modified silicates (OMSs), synthesized with MMTs and octadecylammonium chloride (OAC) by systematically varying the surfactant loading level from 0.625 to 1, 1.25, 1.56, 2, and 2.5 with respect to the cation…
Magnetization $M(H,T)$ measurements have been performed on microporous carbon (MC) with a three-dimensional nanoarray structure corresponding to that of a zeolite Y supercage. The obtained results unambiguously demonstrate the occurrence of high-temperature ferromagnetism in MC, probably originating from a topological…
Phase-pure FeP nanoparticles have been synthesized by the reaction of iron(III) acetylacetonate with tris(trimethylsilyl)phosphine at temperatures of 240−320 °C using trioctylphosphine oxide as a solvent and dodecylamine (DA), myristic acid (MA), or hexylphosphonic acid (HPA) as additional capping groups (ligands). Th…
Density functional calculations have been performed of the energies, structures, and vibration frequencies of carbon chains, rings, graphitic sheets, bowls, cages, and tubes inside single-walled carbon nanotubes (CNT's) with different diameters. The calculated energies show that carbon chains can be inserted coaxially…
The syntheses of silver nanoparticles stabilized by poly(allylamine) (PAA) and by polyethyleneiminated poly(allylamine) (PAA(EI) n ( n = 2, 5.8)) are reported. The architectural effects in particle on the nanoparticle size, size distribution, and agglomeration behavior are determined from the UV−vis plasmon absorption…
We report a Raman scattering study of low-temperature, pressure-induced melting of the charge-density-wave (CDW) phase of $1\mathrm{T}\mathrm{\text{\ensuremath{-}}}{\mathrm{T}\mathrm{i}\mathrm{S}\mathrm{e}}_{2}$. Our measurements reveal that the collapse of the CDW state occurs in three stages: (i) For $P<5\text{ }…
Abstract The crosslinking reaction of poly(vinyl alcohol) (PVA) by esterification using poly(acrylic acid) (PAA) as a crosslinking reagent was investigated to obtain highly insoluble PVA materials. Blend films of PVA and PAA (PVA/PAA = 8/2) were prepared to examine the effect of degree of neutralization (DN) in PAA an…