Materials Literature
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Abstract Nano-ball allophane is a hydrous Al silicate with a hollow-sphere morphology that contains some defects or pores along the spherule walls. Enlargement of the pore openings by dilute alkali treatment was confirmed by cation exchange capacity determinations using various alkylammonium cations as replacement cat…
This paper reports the texture analysis as well as the identification of two crystalline phases between a thin film of monoclinic Ca3Co4O9 and a cubic (100) Si substrate, using a diffractometer equipped with a two-dimensional area detector. No reflections other than 00ℓ were observed in the symmetric configuration usi…
The effects of fine metal oxide particles, particularly those of high-density elements (7.7 to 9.7 x 10(3) kg/m3), on the acoustic properties of silicone rubber have been investigated in order to develop an acoustic lens with a low acoustic attenuation. Silicone rubber doped with Yb2O3 powder having nanoparticle size…
Charge traps at the surface of oxide materials play a fundamental role in various chemical processes, such as the activation of supported metal clusters. In this study, combining electron paramagnetic resonance with cluster model DFT calculations, we show that excess electrons at the surface of MgO, CaO, and SrO polyc…
Bacillaria paxillifera – perhaps better known by its synonym B. paradoxa – is epi-typified with material from close to the type locality. Its morphology – from the living cell and intact colony to the fine structure of the valve and girdle bands – is established using light microscopy, transmission electron microscopy…
Diaryl azo pigments play an important role as yellow pigments for printing inks, with an annual pigment production of more than 50,000 t. The crystal structures of Pigment Yellow 12 (PY12), Pigment Yellow 13 (PY13), Pigment Yellow 14 (PY14), and Pigment Yellow 83 (PY83) were determined from X-ray powder data using lat…
The non‐isothermal crystallization kinetics of iPP with 0.3 wt.% of nucleating agent potassium dehydroabietate (DHAA‐K) or sodium dehydroabietate (DHAA‐Na) at different cooling rates was investigated using a differential scanning calorimetry technique together with Jeziorny's, Mo's, and Cazé‐Chuah's methods. The resul…
Steric control of the extent of reaction has been developed to rapidly synthesize ligated metal-containing dendrons that have been employed in arylalkynyl complex dendrimer synthesis. Reaction of 1,3,5-triethynylbenzene with excess cis -[RuCl 2 (dppe) 2 ] affords 1,3-{ trans -[(dppe) 2 ClRuC⋮C]} 2 -5-HC⋮CC 6 H 3 ( 1 )…
A triode-type field emission device based on carbon nanotubes (CNTs) synthesized on an anodic aluminum oxide (AAO) template was fabricated. For the improvement of device performance, in addition to the basic advantages of using AAO to obtain uniform CNTs with strong adhesion, several considerations were taken into acc…
We have measured the spin-wave dispersion in the ferromagnetic metallic phase of five manganite compounds: ${\mathrm{La}}_{0.7}{({\mathrm{Ca}}_{1\ensuremath{-}y}{\mathrm{Sr}}_{y})}_{0.3}\mathrm{Mn}{\mathrm{O}}_{3}$ with $y=0$, 0.2, 0.4, and 1 and ${\mathrm{La}}_{0.8}{\mathrm{Sr}}_{0.2}\mathrm{Mn}{\mathrm{O}}_{3}$. An…
The structure and mechanical properties of nanocrystalline aluminum alloy 1570 obtained by means of severe plastic deformation have been studied. Being tested in a temperature range from 300 to 400°C, the alloy exhibits high-strain-rate superplasticity. At 400°C, the superplasticity is manifested in a very broad range…
The elastic behavior and the pressure-induced structural evolution of a natural nepheline (K 0.54 Na 3.24 Ca 0.03 Al 4 Si 4 O 16 ) were investigated by in-situ single-crystal X-ray diffraction up to 7.5 GPa with a diamond anvil cell under hydrostatic conditions. As observed in previous studies, at room conditions the…
The thermodynamic quantities associated to the transformation from graphite to multiwalled carbon nanotubes (MWCNTs) were determined by electromotive force (emf) and differential scanning calorimetry (DSC) measurements. From the emf versus T data of galvanic cell Mo|Cr(3)C(2), CrF2, MWCNTs|CaF2 s.c.|Cr(3)C(2), CrF2, g…
Metamaterials (MTMs) are artificial structures made of periodic elements and are designed to obtain specific electromagnetic properties. As long as the periodicity and the size of the elements are much smaller than the wavelength of interest, an artificial structure can be assigned a permittivity and permeability, jus…
Rapid continuous thermal control of chemical reactions such as those for chemical vapor deposition (CVD) growth of nanotubes and nanowires cannot be studied using traditional reactors such as tube furnaces, which have large thermal masses. We present the design, modeling, and verification of a simple, low-cost reactor…
Fluorescent quantum dots (QDs, semiconductor nanocrystals) have gained increasing attention in the past decade due to their unique optical properties. In this work, we synthesized highly luminescent lipophilic CdSe/ZnS core-shell QDs under mild conditions, and encapsulated the QDs into solid lipid nanoparticles (SLNs)…
This paper reports the first total dose tests on a nanocrystalline diamond lateral vacuum field emission microelectronics (VFEM) technology. This technology operates efficiently at both low and high temperatures (200degC) and is inherently ldquohardrdquo to radiation. No measurable change in device response is observe…
Abstract 50 : 50 natural rubber (NR) and ethylene–propylene–diene monomer rubber (EPDM) blends were prepared with different contents of cashew nut shell liquid (CNSL), a natural product obtained from the shells of the cashew nut, as a plasticizer. For comparison, a commercial paraffin oil plasticizer was also used. Th…
A novel superlubric system of fullerene intercalated graphite composite is reported. First, it is clarified that fullerene intercalated graphite films exhibit an ultralow average friction force and an excellent friction coefficient µ<0.001 smaller than µ<0.002 for MoS 2 and µ\cong0.001 for graphite. Next, it is demons…
The formation dynamics of nanosized ceria in cerium nitrate(III) and hexamethylenetetramine (HMTA) solutions has been studied for the first time using UV-visible spectroscopy. The bandgap width and particle size of CeO 2 are controlled by the synthesis duration, reaction temperature, and the concentrations and molar r…