Materials Literature
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Slab lenses formed from nonmagnetic anisotropic media are described. In the case of a uniaxial medium, the requirement is ${ϵ}_{xx}>0,{ϵ}_{zz}<0,z$ being the uniaxis direction, normal to the front and back optical surfaces of the lens. The properties of the lenses are similar to those of lenses made from a negat…
The evolution of antiferromagnetic and ferroelectric transitions for the series of multiferroic $R{\mathrm{Mn}}_{2}{\mathrm{O}}_{5}$ ($R=\mathrm{Sm}$, Eu, Gd, Tb, Dy, and Y) has been investigated by heat capacity measurements on single crystals. Both transition temperatures increase monotonically with the decreasing s…
Abstract Attapulgite (AT)‐reinforced poly(vinyl alcohol) (PVA) nanocomposite films were prepared by solution‐casting technique. The nonisothermal crystallization behaviors of PVA bulk and PVA/AT nanocomposites have been investigated by differential scanning calorimetry (DSC). It has been found that the uniformly dispe…
We derive a new model of structural relaxation in glass based on nonequilibrium statistical mechanics and the Stillinger model of inherent structures. Our model follows the evolution of a system from its equilibrium liquid state through an arbitrary cooling path and allows for the computation of macroscopic properties…
Two new tri(ethyleneglycol)-derivatized Mn(III) porphyrins were synthesized with the aim of increasing their bioavailability, and blood-circulating half-life. These are Mn(III) tetrakis(N-(1-(2-(2-(2-methoxyethoxy)ethoxy)ethyl)pyridinium-2-yl)porphyrin, MnTTEG-2-PyP5+ and Mn(III) tetrakis(N,N'-di(1-(2-(2-(2-methoxyeth…
Abstract Nanocomposites of poly(lactide) (PLA) and the PLA plasticized with diglycerine tetraacetate (PL‐710) and ethylene glycol oligomer containing organo‐modified montmorillonites (ODA‐M and PGS‐M) by the protonated ammonium cations of octadecylamine and poly(ethylene glycol) stearylamine were prepared by melt inte…
Stable free-standing liquid filaments formed by some layered mesophases of bent-core mesogens are unique structures. Some of their physical properties have been analyzed in recent studies, but their microscopic structure and conditions for stability have still been unclear. We explore details of filament shapes and su…
Abstract The nonisothermal crystallization kinetics for ultra–high molecular weight polyethylene (UHMWPE) in liquid paraffin (LP) systems was investigated through differential scanning calorimetry (DSC) measurement. The influence of UHMWPE concentration and cooling rate on crystallization mechanism and spherulitc stru…
Ganciclovir (GCV)-loaded poly(lactide-co-glycolide) (PLGA) microspheres, 125 +/- 11 mum in diameter, are produced using the emulsification/solvent evaporation technique. The release rate of the drug is studied for 20 weeks in a phosphate-buffered solution of pH 7 at 37 degrees C. The release of the drug shows a tripha…
This work reports on the synthesis of mullite powders by a suspension combustion process. Aluminum nitrate, as a source of Al, and a colloidal silica suspension, as a source of Si, are used as reagents, and urea serves as the fuel. This colloidal suspension allows a complete mixing of the reactants, thus promoting a c…
Two cubic pyrochlore phases exist in the system ZnO–Bi 2 O 3 –Sb 2 O 5 . Neither has the supposed “ideal” stoichiometry, Zn 2 Bi 3 Sb 3 O 14 . One, P 1 , is a solid solution phase, Zn 2+ x Bi 2.96−( x − y ) Sb 3.04− y O 14.04+δ where 0< x <0.13(1), 0< y <0.017(2) and a =10.4285(9)−10.451(1) Å. The other, P…
Abstract Summary: We report a simple method for tuning catalytic property of a metallocene‐based catalyst, Cp 2 ZrCl 2 , for ethylene polymerization by the direct adsorption of Cp 2 ZrCl 2 onto multi‐walled carbon nanotubes (MWCNTs). The direct interactions between MWCNTs and the Cp rings of Cp 2 ZrCl 2 controlled the…
Abstract The effect of ring strain on the photochemical and thermal isomerization of azobenzene dimers was investigated by comparison of macrocyclic ( 1 ) and noncyclic ( 2 ) azobenzene dimers. The macrocycle 1 comprises two azobenzene moieties connected at their meta positions through two methylene linkers, whereas t…
Abstract Summary: Tetraaniline‐ block ‐poly( L ‐lactide) diblock oligomers are synthesized via ring‐opening polymerization. The diblock oligomers cast from an L ‐lactide selective solvent (chloroform) show spherical aggregates for the leucoemeraldine state, and ring‐like structures that are composed of much smaller sp…
A sol-gel template technique has been put forward to synthesize single-crystalline semiconductor oxide nanowires, such as n-type SnO2 and p-type NiO. Scanning electron microscopy and transmission electron microscopy observations show that the oxide nanowires are single-crystal with average diameters in the range of 10…
Abstract Summary: We show in this communication that large‐scale necklace‐like single‐crystalline tetragonal perovskite PbTiO 3 nanowires can be obtained via a simple electrospinning method. The morphology and the crystal structure are investigated by SEM, XRD, and HRTEM. The length of the necklace‐like PbTiO 3 nanowi…
Abstract Polyethylene‐octene elastomer (POE)/organoclay nanocomposite was prepared by melt mixing of the POE with an organoclay (Cloisite 20A) in an internal mixer, using poly[ethylene‐ co ‐(methyl acrylate)‐ co ‐(glycidyl methacrylate)] copolymer (E‐MG‐GMA) as a compatibilizer. X‐ray diffraction and transmission elec…
Abstract Summary: Well‐defined multi‐arm star block copolymers, polyglycerol‐ block ‐poly( tert ‐butyl acrylate) (PG‐ b ‐P t BA), with average arm‐numbers of 17, 27, 36, 66 and 90 arms, respectively, have been prepared by atom transfer radical polymerization (ATRP) of t BA in acetone, using a core‐first strategy. Afte…
High‐temperature neutron diffraction and Raman spectra have been obtained on M 2 O–2B 2 O 3 (M=Li, Na, K) glasses and melts. Both techniques indicate a coordination change of boron atoms: the tetrahedral boron sites present in the glasses are converted into triangular boron sites. These changes of the borate network y…
An effective method for the removal of polymeric template, which combines extraction and temperature-controlled calcination, is proposed to obtain high pore volume and large pore size ordered mesoporous silicas, SBA-16 (Im3m symmetry group), synthesized in the presence of sodium chloride at low acid concentrations usi…