Materials Literature
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The effects of Ni substitution on the magnetic properties and magnetocaloric effect (MCE) of (Mn1−xNix)3Sn2 compounds (x=0–0.5) have been investigated by x-ray diffraction and magnetization measurements. It was found that Ni substitution decreases the crystal cell volume and the magnetic transition temperatures compar…
Abstract Dielectric relaxation of chlorinated polyvinyl chloride stabilized with di‐ n ‐octyltin maleate has been studied in the frequency range 1 kHz–1 MHz at various temperatures between 300 and 450 K. A clear dielectric relaxation band (α‐type) associated with dipolar polarization has been observed in the studied r…
We have investigated the magnetic hyperfine structure of iron sulfide Fe0.92S by Mössbauer spectroscopy and studied its magnetic properties. From the x-ray diffraction pattern, Fe0.92S is found to be a 3c-type superstructure of the NiAs hexagonal structure. Magnetization curve at room temperature for Fe0.92S showed a…
Magnetic properties and microstructure of directly quenched Nd9.5Fe72.5Ti3−xMxB15 (M=Nb and Zr; x=0–3) bulk magnets in rod form with a diameter of 0.9 mm have been studied. Proper Nb or Zr substitution for Ti has been found to well modify phase constitution and to refine the grain size from 200 to 50–100 nm effectivel…
We study the transmission of diffuse light through thick slits. For perfectly conducting slits and in-plane s-polarized illumination, the transmittance curves present a staircaselike behavior as a function of the aperture width, where the steps mark the appearance of new propagation modes. In contrast, with p-polarize…
An effective way to obtain hollow hybrid silica-silicone nanocapsules of controlled diameter is presented. For that purpose a new precursor of silica-silicone material, tetra(triethoxysilylethyl) tetramethylcyclotetrasiloxane, was synthesized by hydrosilylation of vinyltriethoxysilane with tetramethylcyclotetrasiloxan…
In this study, the poly-12-hydroxy stearic acid (PTHSA) was synthesized and then modified by esterification with pentaerythritol to obtain a polyol polymeric hyperdispersant (polyol-PTHSA). Under suitable reaction conditions (molar ratio pentaerythritol/PTHSA, 1.2:1; reaction temperature, 453 K; and reaction time, 4−8…
Sea-urchin-like Ni nanoparticles based on radial cones with the diameters of 30-50 nm and the lengths of 150-300 nm were synthesized by a wet chemical reduction method. The microwave properties of the Ni nanoparticle-paraffin wax composites with 11.5 vol%, 18.2 vol%, and 23.3 vol% of the sea-urchin-like Ni nanoparticl…
Cadmium telluride (CdTe) and iron oxide nanoparticles doped silica nanospheres were prepared by a multistep method. Iron oxide nanoparticles were first coated with silica and then modified with amino group. Thereafter, CdTe nanoparticles were assembled on the particle surfaces by their strong interaction with amino gr…
This paper describes a study of the leakage current activity on glass-type insulators of high-voltage transmission lines over a three-month period. Three pairs of sensor systems were installed, one on a 500-kV field tower and the other two on 230-kV and 500-kV substation towers, all in the northeast region of Brazil.…
This paper presents an online hydrophobicity measurement technique for silicone rubber (SIR) insulators on transmission lines and its field test results. Based on the hydrophobicity classification (HC) method, an online hydro-phobicity measurement device was developed, which consists of a controllable sprayer, a video…
Influence of rubbery state large uniaxial deformation followed by relaxation and retraction stages on the mechano-optical behavior of cast amorphous poly(ether ether ketone) films was investigated. At early stage of stretching the birefringence remains linearly proportional to stress. In this linear optical regime, th…
Abstract Salt‐like hydrated complexes of formulae Na[Py 8 TPyzPzCo] and [Py 8 TPyzPzCo](SbCl 6 ) containing Co I and Co III , respectively, and the neutral Co II –bis(dimethyl sulfoxide) (DMSO) adduct [Py 8 TPyzPzCo(DMSO) 2 ], bearing additional clathrated DMSO molecules, have been prepared and characterized {Py 8 TPy…
Poly(methyl methacrylate) (PMMA) based nanocomposites were synthesized by melt intercalation technique using organoclays (Cloisite 30B and Cloisite 20A) as fillers. X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used to determine the dispersion and the morphology of the nanocomposites obtained…
Implementation of the roll-to-roll (R2R) process and printable organic electronics realizes the cost reduction potential of liquid crystal displays (LCDs) on plastic substrates. These innovative technologies put a strong limitation on the chemistry and temperature treatment of the LC alignment material applied at the…
Azide moiety-functionalized gold nanoparticles were conjugated with acetylene functionalized single-walled carbon nanotubes by employing copper-catalyzed Huisgen's [3+2] dipolar cycloaddition 'click chemistry' reaction. Evidences of conjunction were observed by TEM, EDX and Raman images.
BACKGROUND: In medicine, there is limited knowledge on the toxicity of nanoparticles. In medicine, there has been limited knowledge on the effect of nanoparticles on the white blood cell. OBJECTIVE: To evaluate the effect of gold nanoparticle on the microscopic morphology of white blood cell. SETTING: Chulalongkorn Un…
Abstract Layered‐silicate‐based polymer–clay nanocomposite materials were prepared depending on the surface modification of montmorillonite (MMT). Nanocomposites consisting of poly(butylene terephthalate) (PBT) as a matrix and dispersed inorganic clay modified with cetyl pyridinium chloride (CPC), benzyl dimethyl N ‐h…
Palladium nanotube and nanowire arrays were fabricated by electrodeposition into anodic alumina oxide (AAO) templates. By using alumina templates with different pore sizes and hole mouth morphologies, nanotubes with various diameters and lengths were obtained. The mechanism of nano-structure formation was studied by a…
The electrochemical behavior of copper in 0.05 M HCl and 0.05 M NaCl carried out at open-circuit potential and at constant anodic potential after one hour has been investigated using electrochemical impedance spectroscopy (EIS) at 20 °C, 40 °C and 60 °C. The formation of copper chloride (CuCl) film does not protect co…