Materials Literature
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Abstract Morphology, thermal and rheological properties of polymer‐organoclay composites prepared by melt‐blending of polystyrene (PS), poly(methyl methacrylate) (PMMA), and PS/PMMA blends with Cloisite® organoclays were examined by transmission electron microscopy, small‐angle X‐ray scattering, secondary ion mass spe…
The shear induced microstructure for electrostatic and Brownian suspensions are compared using in situ small angle neutron scattering (SANS). The dispersions consist of 75 nm Stöber silica coated with 3-(trimethoxysilyl) propyl methacrylate (TPM) and have a zeta potential of −42.6±4.7 mV. Neutralizing the surface char…
Successful synthesis of room-temperature ferromagnetic semiconductors, Zn1−xFexO, is reported. The essential ingredient in achieving room-temperature ferromagnetism in bulk Zn1−xFexO was found to be additional Cu doping. A transition temperature as high as 550 K was obtained in Zn0.94Fe0.05Cu0.01O; the saturation magn…
A calorimetric method of obtaining directly the fragility of liquids from the fictive temperatures of variably quenched glasses, is outlined. “Steepness indexes” m, have been determined for a group of molecular liquids of diverse character, and vary in the range 50–150. The values obtained mostly agree well with those…
The effects of polymer−particle and particle−particle interactions on viscoelastic properties of nanocomposite materials are investigated using narrow molecular weight distribution poly(ethylene oxide) (PEO) containing isotropic silica nanospheres. Nanocomposites are prepared using a “freeze-drying” method to guarante…
The structure of lead tartrate, Pb(2+).C(4)H(4)O(6)(2-), has been solved from X-ray powder diffraction data. The cation exhibits ninefold coordination and the tartrate groups are linked through Pb.O contacts to form a three-dimensional network.
The Bi 3.25 La 0.75 Ti 3 O 12 (BLT) thin films were prepared by metalorganic decomposition method. The effect of grain size on the ferroelectric properties during crystallization were investigated by x-ray diffraction and field emission scanning electron microscope. The grain size and the roughness of BLT films increa…
Abstract A synthesis procedure for and characterization of a tetra‐ ortho ‐methyl substituted three‐ringed cyanate ester monomer, 4,4′‐[1,3‐phenylenebis(1‐methylethylidene)]bis[2,6‐dimethyl]phenylcyanato, and the corresponding cured resin are described with comparative characterization of the resin analogue without th…
This paper addresses the key requirements for fusion materials, as these have emerged from studies of commercial fusion power plants. The objective of the international fusion programme is the creation of power stations that will have very attractive safety and environmental features and viable economics. Fusion power…
The crystallization of amorphous Sm x Fe 80−x B 20 melt spun ribbons is studied over an extended range of composition (0 < x < 8). Differential scanning calorimetry scans reveal different endo- and exothermic effects depending upon the composition. X-ray diffraction and Mössbauer studies for samples annealed at temper…
The double perovskite Ba 2 FeMoO 6 has been studied by neutron powder diffraction, Mössbauer spectrometry and x-ray absorption spectroscopy, and is compared with Sr 2 FeMoO 6 . It is shown that the size of the A-site cation has a large effect upon the nature of the low-temperature state, favouring the majority Fe 2+ /…
The structural, magnetic and transport properties of the compounds Sr 2 (Fe 1−x Mn x )MoO 6 (0 ≤ x ≤ 0.45) have been studied. The saturated magnetization, Curie temperature and low-field magnetoresistance of the compounds decrease with x , while the resistivity increases by several orders of magnitude when x exceeds a…
Through the Weak-Link Synthetic Approach, the unsymmetric hemilabile ligand, 1,4-bis(2-diphenylphosphinoethoxy)naphthalene ( 7 ), has been used to prepare binuclear Rh(I) macrocycles in a two-step fashion. The intermediate structure, [(μ 2,η 1:η 4:η 1 -(1,4-bis(2-(diphenylphosphino)ethoxy)naphthalene)) 2 Rh 2 ][BF 4 ]…
Adventitious hydrolysis of a number of different complexes with the molecular formula Ln(Tp(Me2))(2)X [Tp(Me2) = (HB(dmpz)(3)), where X is a basic anionic ligand] in various solvents, yielded crystals of highly insoluble dimers of the general formula [Ln(Tp(Me2))(mu-BOp(Me2))](2) (1) [Ln = La, Ce, Sm; BOp(Me2) = (HBO(…
The photoluminescence (PL) of ZnO nanoparticles loaded into porous anodic alumina (PAA) hosts has been investigated. These ZnO/PAA composites are synthesized by soaking the PAA films in an aqueous solution of zinc acetate and then annealing them at 500 ° C. An intense blue PL emission peaked around 450 nm was observed…
We have studied, with quantitative confocal microscopy, epitaxial colloidal crystal growth of particles interacting with an almost hard-sphere (HS) potential in a gravitational field and density matched colloids interacting with a long-range (LR) repulsive potential with a body-centred cubic (BCC) equilibrium crystal…
The terpyridine–phenylphosphine oxide ligands 2–4 and their Eu3+ complexes have been synthesized and studied. In acetonitrile solutions at room temperature, the complexes show an absorption band in the 300–350 nm region, indicating that the terpy units are coordinated to the metal. In these conditions, the complexes s…
Poly(ethylene glycol)−poly( d, l -lactide) (PEG−PLA) block copolymer micelles bearing lactose moieties on their surface were prepared, and their interaction with the lectin Ricinus Communis Agglutinin (RCA-I) was evaluated by surface plasmon resonance. The one-pot, ring-opening anionic polymerization used in the prepa…
This paper presents a novel process for the fabrication of site-selectively deposited tin oxide ultrathin films (<10 nm) by using molecular recognition between the precursors and the surface of the Si substrate. Using this simple technique, the film thickness of micropatterned tin oxide films was easily controlled. Pa…
Structural changes in the cubic spinels CdCr 2−x Ga x Se 4 have been studied by means of single-crystal x-ray diffraction at low temperature and energy-dispersive diffraction in a diamond-anvil cell at high pressure. In stoichiometric samples ( x = 0), a spontaneous magnetostriction reduces the thermal expansion coeff…