Materials Literature
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Rietveld refinements using neutron powder diffraction data were used to locate H atom positions and obtain a more precise crystal structure refinement for akaganéite [Fe 3+ 7.6 Ni 2+ 0.4 O 6.35 (OH) 9.65 Cl 1.25 ·nH 2 O]. Difference Fourier maps clearly showed H atoms positions near those O atoms at the midpoints of t…
Cellular material (emulsions, foams) made out of two different phases, one dispersed in another, may coarsen with time through coalescence, which is the rupture of the thin liquid film that separates two adjacent droplets or bubbles. In this Letter, we study destruction through coalescence of a model cellular material…
The synthesis and characterization of a group of new dendrimers-namely, nanoparticle-cored dendrimers (NCDs)-are described. These materials were obtained by the reduction of hydrogen tetrachloroaurate phase-transferred into toluene in the presence of Fréchet-type polyaryl ether dendritic disulfide wedges of generation…
A porous burner in which a premixed flame is stabilized within the solid matrix is a promising technology for various applications due to its low emissions. In this article, experimental measurements of flame stabilization, operating range, and emissions are reported for several porous burners. The burner consisted of…
Ultrathin films of chiral polyelectrolyte complex, prepared by the multilayering process, exhibit selectivity in the membrane separations of optically active compounds, such as l- and d-ascorbic acid. The flux through these polyelectrolyte multilayers, PEMUs, is exceptionally high and may be controlled by the concentr…
Abstract The dispersion of carbon black ( CB ) in an immiscible polymer blend of poly‐(methyl methacrylate) (PMMA) and polypropylene (PP) was studied as the viscosity of PMMA increased. It was found that the dispersion of carbon black was strongly influenced by the viscosity of PMMA. The CB was dispersed in the PMMA p…
Many attempts have been made to achieve good selectivity to targeted tumor cells by preparing specialized carrier agents that are therapeutically profitable for anticancer therapy. Among these, liposomes are the most studied colloidal particles thus far applied in medicine and in particular in antitumor therapy. Altho…
Nucleation of one polymorph by another has been observed directly in the melt crystallization of d-mannitol and d-sorbitol. The new polymorph nucleated on an existing one and grew to dominate the end product. This effect is relevant to controlling polymorphism in the manufacture of specialty chemicals and to developin…
In this paper, we demonstrate that a protein from Bacillus subtilis (YqjM) shares many characteristic biochemical properties with the homologous yeast Old Yellow Enzyme (OYE); the enzyme binds FMN tightly but noncovalently, preferentially uses NADPH as a source of reducing equivalents, and forms charge transfer comple…
The effect of low-temperature annealing on (Ga,Mn)As/GaAs/(Ga,Mn)As trilayer structures is studied. Low-temperature annealing significantly increases the ferromagnetic transition temperature TC of top (Ga,Mn)As layers, reaching as high as 160 K, whereas no apparent effect is observed on bottom (Ga,Mn)As layers. The an…
Abstract Crystals of three Pb oxide phosphates, Pb 4 O(PO 4 ) 2 , Pb 8 O 5 (PO 4 ) 2 and Pb 10 (PO 4 ) 6 O, were synthesized from mixtures of PbO and NH 4 H 2 PO 4 heated to 950 °C. The crystal structure of Pb 4 O(PO 4 ) 2 (monoclinic, P 2 1 / c , a = 9.4894(8), b = 7.1402(6), c = 14.4077(13) Å, β = 104.549(2)°, V = 9…
The gene encoding a poly(DL-lactic acid) (PLA) depolymerase from Paenibacillus amylolyticus strain TB-13 was cloned and overexpressed in Escherichia coli. The purified recombinant PLA depolymerase, PlaA, exhibited degradation activities toward various biodegradable polyesters, such as poly(butylene succinate), poly(bu…
Bulk MgB2 samples were prepared under different synthesis conditions and analyzed by scanning and transmission electron microscopy. The critical current densities were determined from the magnetization versus magnetic field curves of bulk and powder-dispersed-in-epoxy samples. Results show that through a slow cooling…
Abstract This paper deals with the development of a cellulose acetate biopolymer. Plasticization of this biopolymer under varying processing conditions to make it a suitable matrix polymer for bio‐composite applications was studied. In particular, cellulose acetate was plasticized with varying concentrations of an eco…
Due to its indirect bandstructure, bulk crystalline silicon is generally regarded as a poor light emitter. In contrast to this common perception, we report here on surprisingly large external photoluminescence quantum efficiencies of textured bulk crystalline silicon wafers of up to 10.2% at T=130 K and of 6.1% at roo…
Abstract Conversion of oils into gels generally involves altering the chemical characteristics of the liquid. We describe here the gelling of vegetable oils, essential oils, and hydrocarbons at ambient temperature, without changing the chemical characteristics of the liquids, using saturated FA having carbon chain len…
We present a lattice-dynamics study of the vibrations of a linear chain of Xe adsorbates in groove positions in a bundle of carbon nanotubes. The characteristic phonon frequencies are calculated and the adsorbate polarization vectors are discussed. A comparison of the present results with the ones previously published…
The theoretical study of spin diffusion in double-exchange magnets by means of dynamical mean-field theory is presented. We demonstrate that the spin-diffusion coefficient becomes independent of the Hund's coupling JH in the range of parameters JH*S >> W >> T, W being the bandwidth, relevant to colossal magnetoresisti…
A single, zoned, Sri Lankan zircon exhibits a range of microstructures from crystalline to nearly amorphous that are the result of radiation damage over a dose range of 2.1-10.1·10 15 α-decay events/ mg (0.16-0.47 dpa). The zones in the crystal were examined at a variety of length scales using optical microscopy, micr…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTTwo-Phase Electrospinning from a Single Electrified Jet: Microencapsulation of Aqueous Reservoirs in Poly(ethylene-co-vinyl acetate) FibersElliot H. Sanders, Reneé Kloefkorn, Gary L. Bowlin, David G. Simpson, and Gary E. WnekView Au…