Materials Literature
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The electric field emission behavior of vertically aligned few-layer graphene was studied in a parallel plate–type setup. Few-layer graphene was synthesized in the absence of any metallic catalyst by microwave plasma enhanced chemical vapor deposition with gas mixtures of methane and hydrogen. The deposit consists of…
A model is developed for a parallel-plate waveguide formed by graphene. The graphene is represented by an infinitesimally thin, local two-sided surface characterized by a surface conductivity obtained from the Kubo formula. Maxwell’s equations are solved for the model fields guided by the graphene layers. It is shown…
An extensive review is given of the results from literature on electron beam induced deposition. Electron beam induced deposition is a complex process, where many and often mutually dependent factors are involved. The process has been studied by many over many years in many different experimental setups, so it is not…
Porous ZnO nanoplates are synthesized using a simple microwave method. Interestingly, a gas sensor fabricated using these nanoplates responds strongly to both chlorobenzene and ethanol at differing operating temperatures. This novel gas sensor is a multifunctional and promising sensor for practical applications.
Aggregation of isolated graphene sheets during drying graphene dispersions leads to a loss of its ultrahigh surface area advantage as a two-dimensional nanomaterial. We report a metal nanoparticle-graphene composite with a partially exfoliated graphene morphology derived from drying aqueous dispersions of platinum nan…
Diatoms, a type of microscopic marine and freshwater alga, dominate the oceans and are responsible for about a fifth of the primary productivity on Earth. The complete genome sequence of Phaeodactylum tricornutum is reported in this issue, the second diatom to be sequenced. Comparisons with Thalassiosira pseudonana, t…
The diffraction of Gaussian beams by periodic and aperiodic rulings is considered. The theory of diffraction is based on the Rayleigh-Sommerfeld integral equation with Dirichlet conditions. The transmitted power and the normally diffracted energy are analyzed as a function of the beam radius. Two methods to determine…
Cerium(III) ultraphosphate, CeP(5)O(14), was synthesized by a high-temperature solution reaction between CeO(2) and NH(4)H(2)PO(4) in a Ce-P molar ratio of 1:12. Colourless crystals of the ortho-rhom-bic polymorph were obtained by cooling the melt of the mixture. The structure contains (P(5)O(14))(3-) anionic ribbons…
Abstract Cubic ZrWMoO 8 powders with rod‐like aggregate and thin fasciculus‐like and flower‐like rod cluster morphologies have been successfully fabricated with different amounts of (NH 4 ) 2 HPO 4 as surfactant using a hydrothermal method. X‐ray powder diffraction, scanning electron microscopy, transmission electron…
The Gd(III) complexes of three new octadentate chelators, prepared by substitution of four, two, and one carboxylate groups of EGTA with phosphonate groups, have been investigated by 1H and 17O NMR relaxometric techniques in aqueous solutions. The analysis of the solvent proton relaxivity data as a function of pH, tem…
In this paper we report the temperature dependent electron spin resonance (ESR) and electrical resistivity studies on Bi (1− x ) Ca x MnO 3 ( x = 0.4, 0.45, 0.5, 0.6). The values of charge-ordering temperature T CO and Neel temperature T N estimated from ESR data are comparable to values obtained by other techniques a…
We consider the electromagnetic field due to the reflection and transmission of a plane wave by a bounded periodic structure containing chiral layers. The problem is solved using the 2x2-block-representation transfer-matrix formulation. The frequency and angular dependences of the reflection and transmission coefficie…
Gold nanoparticles were prepared by ethylene glycol (EG) reducing gold chloride under microwave irradiation. The EG-stabilized gold colloids varied from red to blue with increasing amounts of EG, due to particle aggregation. Addition of the macrocyclic polyamine 2,8,14,20-tetranonyl-4,6,10,12,16,18,22,24-octa(1-aminoe…
The spindle pole body (SPB) is a multiprotein complex that organizes microtubules in yeast. Due to its large size and association with the nuclear membrane, little is known about its detailed structure. In particular, although many SPB components and some of the interactions between them have been identified, the mole…
We present a patient with progressive dural calcifications, thickening, and enhancement presumably related to the development of nephrogenic systemic fibrosis (NSF). Head CT demonstrated progressive dural calcifications, whereas MR imaging demonstrated progressive dural thickening and enhancement during a 3-year perio…
The control of simple parameters involved in the process of classic bridging flocculation allow the preparation and fine-tuning a new class of hybrid nanomaterials with respect to size, composition, and morphology. The resulting nanoparticle-filled "nano-bags" are obtained in aqueous suspension by mixing three basic c…
Abstract Nanostructured materials have been establishing themselves as modern generation of high performance materials in many areas ranging from automotive engineering to bioengineering owing to a vast array of their unique properties. Improvements in environmental impact can also be achieved utilizing nanostructure…
Supramolecular assembly formation resulting from molecular recognition between complementary nucleolipids has been visualized in real time at the micrometer scale.
Fracture surfaces created during the interfacial failure of weak interfaces between glassy polymers were investigated with high-resolution scanning electron microscopy (HR-SEM). As reported in an earlier communication ( Macromol. Rapid Commun. 2007, 28, 915−921), we found that interfacial failures between immiscible p…
We present a systematic study of dynamical heterogeneity in a model for permanent gels upon approaching the gelation threshold. We find that the fluctuations of the self-intermediate scattering function are increasing functions of time, reaching a plateau whose value, at large length scales, coincides with the mean cl…