Materials Literature
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Abstract Four kinds of magnesium hydroxide (Mg(OH) 2 ) with different particle sizes are chosen and mixed with ethylene vinyl acetate copolymer (EVA) to investigate the effect of particle size on the flame retardancy of composites, which is evaluated by limiting oxygen index (LOI) testing, horizontal fire testing, and…
Abstract The effects of chitosan coating and vacuum packaging on the quality and shelf‐life of retail packaged grilled pork in a PVDC/nylon pouch during refrigerated storage at 2 ± 1°C were investigated. Grilled pork without chitosan coating and packaged in 100% air was used as the control sample. Firmness, pH, colour…
Two new magnetic chain compounds, where the anionic [M(N3)2(HCOO)-]n chains with a 3-fold bridge of two end-on azido and one syn-syn formato ligands are isolated by the cations of [(CH3)2NH2]+, exhibit metamagnetism because of the strong intrachain ferromagnetic coupling versus the weak interchain antiferromagnetic co…
We have used lattice Monte Carlo simulations to investigate the molecular assembly of symmetric diblock copolymer melts within cylindrical nanochannels. We studied the effect that the surface field has on the copolymer morphology in three cylinders having different diameters. Upon varying the strength of the surface f…
The urea method is explored for a high-yield preparation of CuO−CeO 2 catalysts precursors. Solutions containing urea, Ce(NO 3 ) 3, and Cu(NO 3 ) 2 were aged at 363 K for 5 h, achieving a quantitative coprecipitation in the form of amorphous Cu(II)−Ce(III) basic carbonates, with Cu(II) contents up to 40%. The mixed pr…
Two conformations of isolated single TBrPP-Co molecules on a Cu(111) surface are switched by applying +2.2 V voltage pulses from a scanning tunneling microscope tip at 4.6 K. The TBrPP-Co has a spin-active cobalt atom caged at its center and the interaction between the spin of this cobalt atom and free electrons from…
We use the density functional perturbation theory to determine for the first time the pressure evolution of the Raman intensities for a mineral, the two high-pressure structures of MgSiO3 perovskite and post-perovskite. At high pressures, the Raman powder spectra reveals three main peaks for the perovskite structure a…
We present the study of magnetic and transport properties of Pb(1-x-y-z)Mn(x)Sn(y)Eu(z)Te. AC magnetic susceptibility measurements as well as transport characterization were performed. The obtained results indicate that the presence of two types of magnetic ions influences magnetic properties of investigated IV-VI sem…
In magnetic nanostructures one usually uses a magnetic field to commute between two resistance (R) states. A less common but technologically more interesting alternative to achieve R-switching is to use an electrical current, preferably of low intensity. Such Current Induced Switching (CIS) was recently observed in th…
We observe a thermally induced spontaneous magnetization reversal of epitaxial ferromagnet/antiferromagnet heterostructures under a constant applied magnetic field. Unlike any other magnetic system, the magnetization spontaneously reverses, aligning anti-parallel to an applied field with decreasing temperature. We sho…
Magnetic and electronic properties of the recently-discovered material Sr8CaRe3Cu4O24 were investigated by means of a quantum Monte Carlo simulation, the Green function method and the LSDA+U (local spin-density approximation plus the Hubbard-U term) method. The LSDA+U calculation shows that the ground state is an insu…
High pressure Raman experiments on Boron Nitride multi-walled nanotubes show that the intensity of the vibrational mode at ~ 1367 cm-1 vanishes at ~ 12 GPa and it does not recover under decompression. In comparison, the high pressure Raman experiments on hexagonal Boron Nitride show a clear signature of a phase transi…
The availability of neutron spallation-source instruments that provide total scattering powder diffraction has led to an increased application of real-space structure analysis using the pair distribution function. Currently, the analytical treatment of finite size effects within pair distribution refinement procedures…
The relaxation behavior of poly(3-methylbenzyl methacrylate), poly(3-fluorobenzyl methacrylate), and poly(3-chlorobenzyl methacrylate) was thoroughly studied by broadband dielectric spectroscopy with the aim of investigating the influence of slight differences in chemical structure on the response of polymers to elect…
We report the observation of current-induced abrupt transition from a metallic to an insulating state in a bilayered manganite ${\mathrm{La}}_{1.2}{\mathrm{Sr}}_{1.8}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ single crystal. A colossal electroresistance effect $[\ensuremath{\rho}(50\phantom{\rule{0.3em}{0ex}}\mathrm{mA})\ensu…
The structural characterization of several novel complexes of gallium(iii) and indium(iii) nitrates, crystallized with 2,2'-bipyridyl (bpy) and 1,10-phenanthroline (phen) from nitromethane solution, is presented. The adduct In(NO3)3:bpy (1:2) is of the form [(ONO2)(O2NO)2In(bpy)2], rather than [(ONO2)3ML2] as found fo…
This paper describes enumeration of a class of topologically distinct periodic divisions of a stripe. Optimization of the geometry of these periodic tilings--optimization that yields minimum total perimeter of the tiles--gives a set of physically plausible periodic structures of monodisperse, two-dimensional foams bou…
Acousticlike vibrations were observed in spontaneous Raman measurements on $\mathrm{Cd}{\mathrm{Te}}_{0.68}{\mathrm{Se}}_{0.32}$ quantum dots embedded in a borosilicate matrix and ascribed to the $l=0$, $l=2$, and $l=1$ modes of a spherical particle. Pump-probe stimulated Raman measurements on the same sample reveal o…
Abstract Blends of modified polypropylene (PP) with poly( R , S )‐β‐hydroxybutyrate (PHB) were prepared by casting polymer solutions, followed by compression molding into thin films. The modified polypropylene was obtained by oxidation with hydrogen peroxide. Oxidation of polypropylene produced new functional groups s…
Abstract Mixtures of liquid‐crystalline di‐oxetanes and mono‐oxetanes are made for the purpose of making birefringent films by photopolymerization. The composition of a di‐oxetane mixture that forms spin‐coated films of planarly aligned nematic monomers is reported. These films are photopolymerized in air. The molecul…