Materials Literature
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Liquid oil emulsion droplets can violently dewet their own solid crystals during crystallization as a result of surfactant adsorption. The crystal shape formed is a function of the relative rates of dewetting and crystallization as controlled by surfactant adsorption, cooling rate, and lipid purity. For negligible dew…
We report the existence of families of nonlinear TE-polarized surface waves propagating along the interface between different conventional and left-handed electromagnetic media as well as between two left-handed media. Both nonlinear/nonlinear and linear/nonlinear interfaces are considered. The constraints for the mod…
Two different approaches towards conjugated material (carbon nanotubes, conjugated polymers) functionalisation are presented: covalent bonding of functional groups and covalent interaction with soluble polymers. Covalent functionalisation of carbon nanotubes is made by reaction of the aromatic ring with aryl radicals,…
We have studied layer-by-layer polyelectrolyte self-assembly on pristine individual single-wall carbon nanotubes as a function of solution ionic strength. We report the existence of an ionic strength threshold for the deposition, below which the majority of nanotubes remain uncoated. Once the ionic strength reaches th…
We have applied a continuum self-consistent field (SCF) theory to flexible polyelectrolytes on flat surfaces either uncharged or carrying charges opposite to the polyelectrolytes. We examined in detail the effects of various parameters on the polyelectrolyte adsorption and surface charge compensation by the adsorbed p…
Abstract As part of an effort to investigate spent-fuel behavior during dry-cask storage, thermal creep tests are being performed with defueled Zircaloy-4 cladding segments from two pressurized water reactors — Surry at ≈36 GWd/MTU burnup and H. B. Robinson at ≈67 GWd/MTU burnup, with corresponding fast (E > 1…
Abstract The data base on the corrosion behavior of Zr alloy materials under BWR conditions was evaluated with respect to the burnup target of 70 MWd/kgU. At high burnups, corrosion rate and the rate of hydrogen pickup (HPU) may increase. This onset of increase obviously depends on the material, but also seems to be s…
Cs‐deficient pollucite, Cs 0.9 Al 0.9 Si 2.1 O 6 , a sintered body with a low thermal expansion coefficient of 1.26 × 10 −6 K −1 in the temperature range of 298 to 1273 K, has been fabricated using calcined powders with an amorphous phase. The calcined powder was prepared by heating mixtures of CsNO 3 , γ‐Al 2 O 3 , a…
The effect of addition of nano‐sized particles on densification and thermal conductivity of AlN ceramics was investigated. The commercially available AlN powder (∼0.9 μm) was mixed with 1.89 mass% nano‐sized AlN particles (<0.1 μm), 3.53 mass% Y 2 O 3 , and 2.0 mass% CaO as sintering aid. The mixture was fired at 1…
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…