Materials Literature
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The spin lattice relaxation of I=3/2 quadrupolar spin system due to domain walls in order-disorder ferroelectrics has been studied and a general method is proposed for the measurement of domain width in nano ferroelectrics. Based on the fact that electric polarization undergoes spiral orientation as one moves from one…
We report on the unexpected finding of nanoscale fibers with a diameter down to 25 nm that emerge from a polymer solution during a standard spin-coating process. The fiber formation relies upon the Raleigh-Taylor instability of the spin-coated liquid film that arises due to a competition of the centrifugal force and t…
Native cellulose model films containing both amorphous and crystalline cellulose I regions were prepared by spin-coating aqueous cellulose nanofibril dispersions onto silica substrates. Nanofibrils from wood pulp with low and high charge density were used to prepare the model films. Because the low charged nanofibrils…
Synthesis of mesoporous materials has become more and more important due to their wide application. Nowadays, there are two main ideas in their preparation. One is focused on the templating method. The other is based on metal-organic frameworks (MOFs) constructed from molecular building blocks. Herein, we exploit a ne…
We report a theoretical study of the influence of electron-electron interactions on the one-particle Green's function of a doped graphene sheet based on the random-phase approximation and on graphene's massless Dirac equation continuum model. We find that states near the Dirac point interact strongly with plasmons wit…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPolymer−Graphite Nanocomposites: Effective Dispersion and Major Property Enhancement via Solid-State Shear PulverizationKatsuyuki Wakabayashi, Cynthia Pierre, Dmitriy A. Dikin, Rodney S. Ruoff, Thillaiyan Ramanathan, L. Catherine Br…
In recent years the design of chemical structures of liquid-crystalline materials has developed rapidly, and in many cases changed radically. Since Reinitzer's days, liquid crystals have either been classed as rodlike or disclike, with combinations of the two leading to phasmidic liquid crystals. The discovery that ma…
Skorpionite, Ca 3 Zn 2 (PO 4 ) 2 CO 3 (OH) 2 ·H 2 O, is a new secondary mineral from the Skorpion zinc deposit in south-western Namibia. Associated minerals are tarbuttite, hydrozincite and gypsum. Skorpionite forms colourless needle-like crystals of monoclinic symmetry that are elongated parallel to [001] with domina…
The optimum conditions for the production of food grade gelatin from the tannerybovine hide wastes are established. The process involves cutting the hide wastes intosmall pieces (1-2 cm2), and washing them with water to remove the dirt. The washedpieces are placed in the liming tank containing 10% of lime in water wit…
We analyze the behavior of the longitudinal conductivity ${\ensuremath{\sigma}}_{zz}$ in a field perpendicular to the highly conducting plane of a quasi-two-dimensional multiband metal in the case of a closed system where chemical potential oscillations may be observed compared with the case of an open system for vari…
The crystal structure of Escherichia coli ribonuclease I (EcRNase I) reveals an RNase T2-type fold consisting of a conserved core of six beta-strands and three alpha-helices. The overall architecture of the catalytic residues is very similar to the plant and fungal RNase T2 family members, but the perimeter surroundin…
Local structure and magnetic properties of Ti doped A-site deficient La0.6Sr0.4−xMnTixO3+δ manganites (0.15⩾x⩾0) have been studied. The compositions belong to rhombohedral R3¯c phase. Segregation of (La0.6Sr0.4−xMny)(Mn1−y−zTix)O3+δ phase and fallout of (z∕3)Mn3O4 oxide was observed with x increase. Some amount (y) of…
We have studied the electronic structure of Co doped ZnO by theory and experiment. Photoelectron and x-ray absorption spectroscopy experiments were performed on 5% Co doped ZnO thin films. The results show that Co-3d states lie in the valence band and hybridize considerably with O-2p states. These results compare qual…
High-quality ZnO epitaxial films were grown by pulsed-laser deposition on Si (1 1 1) substrates with a thin γ-Al 2 O 3 buffer layer. The epitaxial γ-Al 2 O 3 buffer layer consists of two (1 1 1) oriented domains rotated 60° from each other against the surface normal, which yields the in-plane epitaxial relationship or…
Unidirektional ausgerichtete Hybride aus Chitin und Calcit wurden durch templatunterstützte Kristallisation von CaCO3 in einem geordneten Chitinfilm mit nematisch-flüssigkristalliner Ausrichtung erhalten. Das Bild zeigt die resultierende Chitinmatrix (schematisch und lichtmikroskopisch) und das Feinbereichsbeugungsmus…
Zeo-Licht: Silberhaltige Zeolith-3A-Kristalle bestechen durch ungewöhnliche Lumineszenzeigenschaften: Die Bestrahlung mit starkem UV-Licht führt über eine Photoaktivierung zu einer um zwei Größenordnungen intensiveren Emission (siehe Bild). Einzelne Kristalle oder kleine Bereiche davon können mithilfe eines konfokalen…
We report a state of the art density functional theory study of the intrinsic defects within the rocksalt-structured silver halides. These materials are well known to favor Frenkel defect pairs over Schottky pairs---a key factor in their use as photographic materials. We report the defect structures and formation ener…
PURPOSE: To prospectively determine, in an animal tumor model, if the block copolymer Pluronic P85 (BASF, Shreveport, La) sensitizes cancer cells to hyperthermia and if intratumorally or intravenously administered copolymer improves the therapeutic outcome of radiofrequency (RF) ablation tumor treatment. MATERIALS AND…
Uedaite-(Ce), ideally Mn 2+ CeAl 2 Fe(Si 2 O 7 )(SiO 4 )O(OH), occurs in granite at Shodoshima Island in Seto Inland sea, Kagawa Prefecture, Japan. It is monoclinic, P 2 1 / m , a = 8.939(8) A, b = 5.742(4) A, c = 10.187(8) A, β = 115.10(6)°, V = 473.5(6) A 3 , Z = 2. The four strongest lines in the powder XRD pattern…
We report the light-induced incandescence of single-walled carbon nanotubes excited by weak visible and infrared laser beams. The phenomenon does not occur on bulk graphite and amorphous carbon under the same conditions. The intensity of the incandescence is exponentially proportional to the incident laser power and t…