Materials Literature
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Abstract Through the neutralization of magnesium oxide (MgO) and methacrylic acid (MAA), magnesium methacrylate [Mg(MAA) 2 ] was in situ prepared in styrene–butadiene rubber (SBR) and used to reinforce the SBR vulcanizates cured by dicumyl peroxide (DCP). The experimental results show that the mechanical properties, d…
An investigation of M(3)O(13) unit ("M(3) cap") isomerization in the classical polytungstodiphosphates alpha- and beta-P(2)W(18)O(62)(6)(-) has been undertaken because cap isomerism is an important and structurally well-studied phenomenon in many polyoxometalate families. The relative thermodynamic stabilities of the…
A novel nanoporous composite containing micrographitic carbon layers is synthesized by preliminarily expanding the interlayer of an oxidized product of graphite using surfactant, followed by Si bridging/pillaring, and carbonization.
Traditional conducting polymer actuators such as polypyrrole offer tremendous active stress at low actuation voltages but with moderate strain, strain-rate and efficiency. We report the synthesis of novel thiophene based conducting polymer molecular actuators, exhibiting electrically triggered molecular conformational…
A novel regioselectively substituted cellulose ether with poly(ethylene oxide) (PEO) side chains, 6-O-trityl-2,3-O-PEOcellulose (TPEOCELL), was synthesized and characterized. The polymer is a thermotropic liquid crystalline material and forms a right-handed chiral nematic phase which reflects visible light at room tem…
We have cloned and functionally characterized a novel protein, BmVMP30, which is synthesized by the cells of the follicular epithelium of the ovarian follicles of the domesticated silkworm Bombyx mori, secreted from them and associated with the vitelline membrane. BmVMP30 is a 30 kDa protein that bears limited structu…
The cubic-to-rhombohedral (C–R) phase transition of the ferroelectric relaxor Pb(Zn 1/3 Nb 2/3 O 3 ) is investigated by means of a high-resolution x-ray diffraction study on single crystals. The phase transition is diffuse and spreads over the temperature range T CR = 385 ± 5 K to T R = 325 ± 5 K. Below T CR , the cub…
Advances in active materials and smart structures, especially in applications of Shape Memory Alloys (SMA) as vibration isolation devices requires modeling of the pseudoelastic hysteresis found in SMAs. In general SMA hysteresis has been modeled either through constitutive models based on mechanics and material parame…
Conducting polymer actuators were first proposed more than ten years ago. Reported performance has improved dramatically, particularly in the past few years, due to changes in synthesis methods, better characterization and an understanding of the underlying mechanisms. These actuators are able to displace large loads…
Ab initio theoretical results are reported to determine the role of interatomic screening of the metal core hole in Mn $3s$ x-ray photoelectron spectra (XPS) of MnO. We present information that finally resolves the controversy about the relative importance of intra-atomic and interatomic effects to the XPS spectra of…
Abstract This article presents a series of nanocomposites of a polyester [poly (ethylene terephathalate), PET] with different contents of layered silicates of montmorillonite (MMt) by a controlled process, that is, controlling the way to pretreat MMt, the content of MMt, the kind of reagents used, and the way for MMt…
Abstract Maleic anhydride grafting onto polypropylene was conducted in a twin‐screw extruder according to an experimental design in which the maleic anhydride and peroxide concentrations were varied. The modified polypropylene was characterized by FTIR spectroscopy, melt‐flow index measurements, size‐exclusion chromat…
The first gas-phase ion chemistry studies of the transuranium actinides Np and Pu by Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FTICR-MS) have been performed. Reactions of An + and AnO + (An = Th, U, Np, and Pu) with N 2 O, C 2 H 4 O (ethylene oxide), H 2 O, O 2, CO 2, NO, and CH 2 O have been studie…
The simple asymmetric tetradentate ligand 2,2':6',2' '-terpyridine-6-carboxylic acid leads to the self-assembly of the first europium nanowheel containing europium ions in two different coordination environments. Moreover the self-assembly of bis(terpyridinecarboxylate) europium species to form a hexameric wheel capab…
The adsorption of rare gases in a disordered mesoporous silica glass has been studied by means of grand canonical Monte Carlo (GCMC) simulation. A series of porous samples has been obtained by using an off-lattice 3D reconstruction method recently introduced to reproduce topological and morphological properties of cor…
The neutral oxygen vacancy in ${\mathrm{SiO}}_{2}$ is important both through its role in controlled refractive index changes and as an archetypal intrinsic defect. We have studied the very significant effects of lattice relaxation on the structure and properties of this defect in both pure and Ge-doped \ensuremath{\al…
To investigate whether diblock copolymers with substantial distributions of molecular weight and composition can self-assemble into highly regular microdomain structures, we examine the morphologies of polystyrene- b -poly(acrylic acid), diblock copolymers (PS−PAA) synthesized by controlled radical polymerization in e…
We have studied the effect of ageing within the miscibility gap on the electric, magnetic and thermodynamic properties of a non-stoichiometric Heusler Cu-Al-Mn shape-memory alloy, which undergoes a martensitic transition from a $bcc$-based ($β$-phase) towards a close-packed structure ($M$-phase). Negative magnetoresis…
Single-wall carbon nanotubes can be doped, or intercalated, with electron donors or acceptors, similar to graphite and some conjugated polymers. The resulting materials show many of the same features: enhanced electrical conductivity, conduction electron paramagnetism, partial or complete reversibility, and cyclabilit…
We discuss the important aspects of synthesis and crystal growth of MgB2 under high pressure (P) and temperature (T) in Mg-B-N system, including the optimisation of P-T conditions for reproducible crystal growth, the role of liquid phases in this process, the temperature dependence of crystal size and the effect of gr…