Materials Literature
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Pressureless‐sintered lanthanum gallate (LaGaO 3 ) ceramics have been analyzed using X‐ray diffractometry (XRD) and scanning electron and transmission electron microscopy (SEM and TEM). Twins are induced by solid‐state phase transformation upon cooling from rhombohedral to orthorhombic ( o , Pnma ) symmetry at ∼145°C.…
Stimulated emission was studied using time-integrated and time-resolved photoluminescence in ZnO comb, tetrapod, and rod nanostructures. All the measurements were performed on ensembles of the nanostructures. The nanostructures were fabricated by vapor deposition (combs, tetrapods) and hydrothermal methods (rods). Whi…
A series of boron nitride fibers were prepared by varying the tension applied on a same lot of poly(methylamino)borazine fibers during their pyrolytic conversion at 1800°C. Their microstructure/microtexture was studied by X‐ray diffraction, scanning electron microscopy, and transmission electron microscopy investigati…
A Mn(III) salen complex was immobilized onto the Laponite surface using three different methodologies: method A, direct immobilization of the complex on the parent Laponite; method B, covalent anchoring through cyanuric chloride (CC); and method C, covalent anchoring through CC into a 3-aminopropyl)triethoxysilane (AP…
Study of a diverse set of chiral smectic materials, each of which has twist grain boundary (TGB) phases over a broad temperature range and exhibits grid patterns in the Grandjean textures of the TGB helix, shows that these features arise from a common structure: "giant" smectic blocks of planar layers of thickness l(b…
The ring-opening dynamics of the photochromic switch 1',3'-dihydro-1',3',3'-trimethyl-6-nitrospiro[2H-1-benzopyran-2,2'-(2H)-indole] in tetrachloroethene is studied with both femtosecond time-resolved ultraviolet (UV)/visible and UV/mid-infrared (IR) pump-probe spectroscopy. During the first picosecond we identify two…
Surfactant-templated materials are created through self-assembly in solutions containing both surfactant micelles and an inorganic species. The resulting materials are composites containing an organized surfactant micelle array encapsulated in the inorganic material. Removal of the surfactants generates nanoscale pore…
Crystalline ZnO nanowires were grown by the pulsed laser deposition (PLD) approach using a femtosecond laser as the ablation source. As determined by electron microscopy, the femtosecond PLD grown ZnO nanowires showed good crystalline characteristics and reasonably uniform diameters, which can be attributed to the hom…
The diffuse‐phase transition in BaTiO 3 ‐based dielectrics for capacitor applications has been studied with respect to its dependence on oxygen partial pressure during sintering. Understanding the mobility of this transition is critical in developing next generation dielectrics for ultra thin (≤1 μm) applications whil…
Photochromic host−guest inclusion compounds were obtained by growing crystals of γ-cyclodextrin in the presence of substituted photochromic spiropyrans. The relative stabilities of the photogenerated photomerocyanine guests inside the host structure were determined. Interactions in the solid state selectively enhanced…
A mutant in which S-adenosylmethionine synthetase is underexpressed makes filaments with no visible septa. Examination with GFP fusions to various septal proteins shows that FtsZ, ZipA and FtsA localize to the septal ring, but FtsQ, FtsW, FtsI or FtsN do not. The requirement for S-adenosylmethionine suggests that some…
The dynamic compressive responses of a damaged but interlocked hot‐pressed silicon carbide were determined as a function of loading rates, damage, and confinement. A novel experimental technique based on a split Hopkinson pressure bar was used to conduct the high strain‐rate experiments. The ceramic specimen was loade…
Oxidatively stable, magnetic cobalt nanoparticles have been prepared by heating cobalt nanoparticles encapsulated in poly(styrene- b -4-vinylphenoxyphthalonitrile) block copolymers at elevated temperatures. The block copolymers were synthesized through the sequential anionic polymerization of styrene and tert -butyldi…
LaEr ( MoO 4 ) 3 thin films have been grown by pulsed laser deposition. The films were characterized by x-ray diffraction, Rutherford backscattering, and fluorescence measurements. The results show that the deposited films were epitaxial with their c axis oriented along the surface normal. Films illuminated with 980 n…
Reversible self-propelled movements of droplets of long chain alkanes are presented and analyzed. Slightly above the bulk melting temperature, solid alkane multilayers melt into droplets which move in a self-avoiding, random path. While moving, the droplets consume the solid alkane and leave behind a widening groove.…
A series of TiO2-TUD-1 samples was synthesized with a variable Ti loading in the range Si/Ti = 100, 20, 2.5, and 1.6, by using a one-pot surfactant-free procedure. The materials obtained were characterized by elemental analysis; X-ray diffraction (XRD); N2 sorption measurements; high-resolution TEM (HR-TEM); 29Si NMR,…
A fast decay emission peaking at 645 nm with a decay lifetime within the experimental resolution of 0.14 micros is observed in ZnS:Mn2+ nanoparticles. This short-lived signal is also observed in pure ZnS and MgS: Eu3+ nanoparticles, which has nothing to do with Mn(2+)-doped ions but is from the deep trap states of the…
The interaction of the trivalent lanthanides Ce(III), Eu(III), and Tb(III) with sodium deoxyribonucleic acid (DNA) in aqueous solution has been studied using their luminescence spectra and decays. Complexation with DNA is indicated by changes in luminescence intensity. In the system terbium(III)-DNA, changes in lumine…
Abstract The corrosion and hydriding behavior of M5 and low tin Zircaloy-4 in PWR have been compared at high burn-ups (>70 GWd/t). Whereas low tin Zircaloy-4 reached about 90 μm in oxide thickness and is subjected to significant precipitation of hydride rims at the metal/oxide interface, the oxide layer on M5 r…
Ab initio calculations on ${\mathrm{Rh}}_{n}\phantom{\rule{0.3em}{0ex}}(n=8--64)$ clusters surprisingly show simple cubic structures to be most favorable up to $n\ensuremath{\sim}27$. These are stabilized by eight center bonding and lie significantly lower in energy than the icosahedral isomers found in previous studi…