Materials Literature
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Here we report the synthesis of new B-rich phase, boron subnitride B 13 N 2 by crystallization from the B-BN melt at 5 GPa. The structure of B 13 N 2 has been resolved by the Rietveld analysis and represents a new structural type formed by the distorted boron icosahedra linked together by N-B-N chains and inter-icosah…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTDiffusion in Polymer Blends by Raman MicroscopyA. C. De Luca†‡, G. Rusciano*†‡, G. Pesce†§, S. Caserta⊥, S. Guido⊥, and A. Sasso†‡View Author Information Dipartimento di Scienze Fisiche, Università di Napoli Federico II, Via Cinthia…
Abstract Nickel oxide nanoparticles and nanoflowers have been synthesized by a soft reaction of nickel powder and water without organics at 100 °C. The mechanism for the formation of nanostructures is briefly described in accordance with decomposition of metal with water giving out hydrogen. The structure, morphology,…
The classical method for measuring the inherent periodicity, or “pitch”, in the order parameter in a cholesteric liquid crystal implies using a wedge cell with well‐defined boundary conditions. But the error can be large due to difficulties in controlling the wedge angle, α. A modified method is presented that signifi…
Hollow ZnSe microspheres were successfully synthesized by a simple chemistry vapor deposition method in a horizontal tube furnace. The as-obtained samples were characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, and energy-dispersive X-ray spectrometry. Th…
A mathematical model for the performance of a radial-flow moving-bed reactor for dehydrogenation of light paraffins was developed. Assuming relevant kinetic expressions for the main reaction and catalyst deactivation, the kinetic parameters were obtained through lab-scale fixed-bed reactor testing using the integral m…
The interaction strength of sodium ions (Na(+)) with cellulose is investigated from first principles for varying degrees of water content. We find that the interaction of water molecules and Na(+) can be studied independently at the various OH groups in cellulose which we categorize as two different types. In the abse…
We report on the nanofabrication of patterned silver particle arrays using electron-beam lithography and the evaluation of their optical properties using backscattering and fluorescence spectroscopy. The silver particles varied in size from 100 to 250 nm and were in the shape of circles, squares, and triangles. Three…
Si sculptured thin films consisting of spiral-, screw-, and columnlike-shaped nanostructures were grown by ion beam-induced glancing angle deposition of Si on rotating bare Si[001] substrates at different substrate rotational speeds and substrate temperatures ranging from room temperature to (360±10)°C. For rotational…
The corrosion and inhibition behaviour of aluminium in hydrochloric acid (HCl) in the absence and presence of polyvinyl pyrrolidone (PVP), Polyacrylamide (PA) and their blends was studied in the temperature range of 30 – 60 o C using weight loss, hydrogen evolution and thermometric techniques. The inhibition efficienc…
Two aryl amide ligands, N-(p-tolyl)-2-(quinolin-8-yloxy)acetamide (L1 ) and N-(4-chlorophenyl)-2-(quinolin-8-yloxy)acetamide (L2 ), were synthesized. With these ligands, two series of lanthanide(III) complexes were prepared, Ln(L n )2(NO3)3 (n = 1, 2; Ln = La, Sm, Eu, Gd, Dy), and characterized by the elemental analys…
Quaternary antimonide oxides REMnSbO (RE = La, Ce, Pr, Nd, Sm,Gd, Tb) and REZnSbO (RE = La, Ce, Pr) were synthesized from the RESb monoantimonides and MnO, respectively ZnO, in sealed tubes at 1170 K. Single crystals were obtained from NaCl/KCl salt fluxes. The ZrCuSiAs-type (space group P4/nmm) structures of LaMnSbO…
The influence of shape and dielectric property of surrounding media on surface plasmon absorption band of silver nanoparticles was studied. Spherical silver nanoparticles (d = 5.6 nm) synthesized in water using NaBH4 as a reducing agent are transferred in non-polar solvent (chloroform) with phase-transfer reagent oley…
Hydrogen-induced cracking (HIC) has been studied phenomenologically. The effect of microstructure on HIC is discussed for steels having two different levels of nonmetallic inclusions. Steels with different microstructures were produced by a thermomechanically controlled process (TMCP) from two different heats, which h…
A 1 μm long, field emitting, (5, 5) single-walled carbon nanotube (SWCNT) closed with a fullerene cap, and a similar open nanotube with hydrogen-atom termination, have been simulated using the modified neglect of diatomic overlap quantum-mechanical method. Both contain about 80 000 atoms. It is found that field penetr…
Reactive gas plasma treatments of poly(ethylene terephthalate) (PET) and polyimide (Kapton) have been performed using an atmospheric plasmas jet source. Characteristics of surface modification have been examined by changing the distance between the plasma jet source and the treated sample, and by changing the working…
Abstract The reaction behavior of species that may affect the growth of ultrananocrystalline and nanocrystalline diamond ((U)NCD) films is investigated by means of molecular dynamics simulations. Impacts of CH x (x= 0– 4), C 2 H x ( x = 0 – 6), C 3 H x ( x = 0 – 2), C 4 H x ( x = 0 – 2), H, and H 2 on clean and hydrog…
High-pressure X-ray diffraction studies on gadolinium sesquioxide (Gd2O3) have been carried out up to a pressure of ∼25 GPa in a diamond-anvil cell at room temperature. Gadolinium oxide, which has a cubic or bixbyite structure under ambient conditions, undergoes an irreversible structural phase at around 12 GPa. The h…
A novel series of chiral liquid crystalline materials based on 1,3,4‐ and 1,2,4‐oxadiazole derivatives were synthesised. These compounds contain a chiral chain derived from (R)‐2‐octanol (Ia–Ic), (S)‐ethyl lactate (IIa–IIc) or (S)‐isoleucine (IIIa–IIIc). Their liquid crystalline properties were studied by polarizing o…
Organometallic porphyrins with a metal, metalloid or phosphorus fragment directly attached to their carbon framework emerged for the first time in 1976, and these macrocycles have been intensively investigated in the past decade. The present review summarises for the first time all reported examples as well as applica…