Materials Literature
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This paper describes the design of two- and three-stage cascaded oxide thermoelectric generators (TEGs) for high-temperature heat recovery using reported data to optimize energy conversion efficiency. We used the general intermetallic compounds Bi2(Se,Te)3 and (Bi,Sb)2Te3 for the low-temperature stages and oxides of T…
We report the synthesis of a series of mixed valence Mn(II/IV) tetranuclear clusters [Mn(II)2Mn(IV)2O2(heed)2(EtOH)6Br2]Br2 (1), [Mn(II)2Mn(IV)2O2(heed)2(H2O)2Cl4].2EtOH.H2O (2.2EtOH.H2O), [Mn(II)2Mn(IV)2O2(heed)2(heedH2)2](ClO4)4 (3), [Mn(II)2Mn(IV)2O2(heed)2(MeCN)2(H2O)2(bpy)2](ClO4)4 (4) and [Mn(II)2Mn(IV)2O2(heed)…
We integrate carbon nanotube (CNT) fabrication with commercial CMOS VLSI fabrication on a single substrate suitable for emerging hybrid nanotechnology applications. This co-integration combines the inherent advantages of CMOS and CNTs. These emerging applications include CNT optical, biological, chemical, and gas sens…
We have investigated the stacking of model bowlic mesogens, and the nematic and columnar liquid crystal phases they form upon cooling-down from an isotropic liquid. Starting from an attractive–repulsive interaction obtained by generalising the Gay–Berne pair potential to bowlic shapes, we have performed extensive off-…
Copper is generally assumed to be immune to corrosion by water itself. However, this is not supported by any scientific experimental evidence. Corrosion results from 15 years of exposure are presented here. A transition from O 2-consuming to H 2-evolving copper corrosion is concluded, which implies that copper can cor…
We recently found that the chromonic mesophase structure of an azo dye can be immobilized by a silica network to form a chromonic–silica nanohybrid. This work reports the first demonstration of the macroscopic photoalignment and photopatterning of this nanohybrid via surface-mediated orientational transfer from a phot…
Effects of Eu2 + Concentration Variation and Ce3 + Codoping on Photoluminescence Properties of BaGa2S4 : Eu2 + Phosphor, Yoo, Hyoung Sun, Im, Won Bin, Vaidyanathan, Sivakumar, Park, Bong Je, Jeon, Duk Young
Partial discharge (PD) activity results in the degradation of insulation systems in a range of high and medium voltage equipment and if left unchecked will eventually lead to disruptive failure of the equipment. Operating MV equipment with active partial discharge increases the risk of failure occurring at the time of…
Gold nanorods (GNRs) were encapsulated and dispersed into organic solvents by tetrabenzylthiol resorcinarene (TBTR) and by a poly(dithiocarbamate) derived from tetra- N-methyl(aminomethyl)resorcinarene (TMAR-DTC), formed by the in situ condensation of TMAR with carbon disulfide. The latter proved to be highly effectiv…
Isotropic conductive adhesives (ICAs) filled with metal particles are commercially available as alternatives to solder joining in electronic packaging. Replacing metal fillers with multiwall carbon nanotubes (MWCNTs) offers the potential benefits of being corrosion resistant, high strength and lightweight. Traditional…
A series of novel TTF derivatives has been synthesized. Polarized optical microscopy (POM), differential scanning calorimetry (DSC) and X-ray diffraction (XRD) techniques reveal the first room temperature columnar liquid crystal based on TTF.
Nickel nanowires with a diameter of ∼200 nm were prepared using the electrodeposition technique. The length of the nanowires was varied from 0.7 to 5.6 μm, which corresponds to the change in the aspect ratio from 3.5 to 28. Field emission scanning electron microscopy and x-ray diffraction spectra confirm the formation…
An efficient and operationally simple method for catalytic allylation has been developed and its application in the microwave-assisted catalytic allylation of aldehydes in solid media was investigated.
Neste estudo, fibras de sisal foram utilizadas como reforço para a matriz constituída de amido, glúten de milho e glicerol. O teor de fibra em relação a matriz variou de 5 a 30%. O processamento da matriz e dos compósitos foi realizado em um reômetro de torque Haake à 130 °C, 50 rpm por 10 minutos. As misturas obtidas…
In this paper, grain refinement of pure magnesium using severe plastic deformation was investigated in order to enhance mechanical properties of the hard-to-deform metallic material. The microstructure and the mechanical properties of Mg processed by equal channel angular pressing (ECAP) at various processing temperat…
Single-walled carbon nanotubes (SWNTs) were chemically attached to an n-type silicon (100) substrate (n-Si) by exposing the surface to a nanotube-containing suspension for attachment times varying from 2 to 72 h. The SWNTs were imaged by atomic force microscopy (AFM) revealing a high density of vertically aligned SWNT…
A series of four Zn(II) complexes with asymmetrical porphyrinic ligands were synthesized: [5-(4-hydroxyphenyl)-10,15,20-triphenyl-21H,23H-porphinato]Zn(II) (Zn(II)TPPOHP), [5-(3-hydroxyphenyl)-10,15,20-triphenyl-21H,23H- -porphinato]Zn(II) (Zn(II)TPPOHM), [5-(2-hydroxyphenyl)-10,15,20-triphenyl- -21H,23H-Zn(II)-porphi…
The crystal phase and mechanical properties of 2.0 to 3.5 mol% Y2O3-stabilized zirconia polycrystals sintered from agitator milled powders (solid phase mixing, SPM) were investigated. Powders containing 2.5 and 2.8 mol% Y2O3 showed higher sinterability than those containing 2.0 and 3.5 mol% Y2O3. The thermal expansion…
Abstract Commercial cellulose ethers are usually prepared under heterogeneous reaction conditions. In contrast, this contribution also describes the derivatization under homogeneous conditions in N‐methylmorpholine‐N‐oxide monohydrate (NMMNO*H 2 O) and under heterogeneous conditions after converting native cellulose t…
Diffusion pack coatings via Al-Si powders with an AlCl3 chloride activator have been investigated in order to examine the surface protection effect on pure magnesium and magnesium alloys. Pure Magnesium and commercial AZ31 magnesium alloys have been subjected to diffusion coatings in an Al alloy powder for various tim…