New Technique for Ultra-thin Serial Brain Section Imaging Using Scanning Electron Microscopy
Extended abstract of a paper presented at Microscopy and Microanalysis 2007 in Ft. Lauderdale, Florida, USA, August 5 – August 9, 2007
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Synthesis, Characterization of Copper‐Loaded Carboxymethyl‐Chitosan Nanoparticles with Effective Antibacterial Activity
Abstract Summary: Copper‐loaded carboxymethyl‐chitosan (CMCS‐Cu) nanoparticles were successfully prepared by chelation under aqueous conditions. The effect of degree of deacetylation and substitution, the molecular weight of CMCS, CMCS concentration, Cu(II) ions concentration, pH value of the solution, as well as temp…
Formation of superhydrophobic surfaces by the deposition of coatings from supercritical carbon dioxide
The deposition of uniform coatings of fluorinated polymers from solutions in supercritical carbon dioxide on a number of rough substrates allowed superhydrophobic (ultrahydrophobic) properties to be imparted to their surfaces, and, namely, to increase the value of the contact angle for water droplet to 150° and greate…
Nanobiotechnology: quantum dots in bioimaging
Many biological systems, including protein complexes, are natural nanostructures. To better understand these structures and to monitor them in real time, it is becoming increasingly important to develop nanometer-scale signaling markers. Single-molecule methods will play a major role in elucidating the role of all pro…
Effect of Te doping on superconductivity and charge-density wave in dichalcogenides 2H-NbSe2-xTex(x= 0, 0.1, 0.2)
Single crystals of Te-doped dichalcogenides 2H-NbSe2-xTex (x = 0,0.10,0.20) were grown by vapour transport method. The effect of Te doping on the superconducting and charge-density wave (CDW) transitions has been investigated. The sharp decrease of residual resistance ratio, RRR = R(300K)/R(8K), with increasing Te con…
Nanometer-scale chemical modification of nano-ball allophane
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…
Texture and phase analysis of a Ca3Co4O9∕Si (100) thermoelectric film
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…
Effects of Fine Metal Oxide Particle Dopant on the Acoustic Properties of Silicone Rubber Lens for Medical Array Probe
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…
Partially Hydroxylated Polycrystalline Ionic Oxides: A New Route toward Electron-Rich Surfaces
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…
Revision of the brackish-freshwater diatom genusBacillariaGmelin (Bacillariophyta) with the description of a new variety and two new species
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…
Crystal Engineering on Industrial Diaryl Pigments Using Lattice Energy Minimizations and X-ray Powder Diffraction
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…
Non‐isothermal Crystallization Kinetics and Morphology of Isotactic Polypropylene (iPP) Nucleated with Rosin‐based Nucleating Agents
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…
Organometallic Complexes for Nonlinear Optics. 39.1 Syntheses and Third-Order Nonlinear Optical Properties of First-Generation Peripherally Metalated Arylalkynyl Dendrimers
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 high-performance triode-type carbon nanotube field emitter for mass production
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…
Spin waves in the ferromagnetic metallic manganitesLa1−x(Ca1−ySry)xMnO3
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…
High-strain-rate superplasticity of nanocrystalline aluminum alloy 1570
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…
Elastic behavior and pressure-induced structural evolution of nepheline: Implications for the nature of the modulated superstructure
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 Thermodynamics of the Transformation of Graphite to Multiwalled Carbon Nanotubes
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…
Wakefield generation in metamaterial-loaded waveguides
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…
Suspended heated silicon platform for rapid thermal control of surface reactions with application to carbon nanotube synthesis
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…