Materials Literature
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With the ultimate goal of developing thermal storage materials by means of computer simulation, we attempt to predict a material's melting point and latent heat of fusion, both of which are important properties for evaluating a thermal storage material. Molecular dynamics calculations using the NPT ensemble were perfo…
New carbohydrate-functional siloxanes (CHFS) have successfully been synthesized by acid-catalyzed transacetalation between unprotected methyl gluconyl glycinate (MGG) as a hydrophilic component and an acetal-functional siloxane in DMF/dioxane mixed solvents. MGG, which can be regarded as a hybrid material composed of…
Abstract For Abstract see ChemInform Abstract in Full Text.
We have investigated the role of N 2 in the synthesis of carbon nanotubes (CNTs) by dc hot-filament plasma-enhanced chemical vapor deposition. An NH 3 and C 2 H 2 gas mixture with a ratio of 4:1 was used as a precursor for the synthesis of CNTs on nickel-coated TiN/Si (100) substrates. N 2 gas was introduced at a flow…
The Rayleigh scatterings of fluorine-doped silica glasses as a function of fictive temperature were examined. The scattered intensity of pure silica glass increases proportionally to fictive temperature, implying that density fluctuation increases proportionally to fictive temperature. While the Rayleigh scattering ca…
Germanium (Ge) nanostructures embedded in Al 2 O 3 dielectric are synthesized by the vacuum electron-beam co-evaporation method. A clear blue-shift of the absorption edge and a large third-order nonlinear optical susceptibility are observed due to the quantum confinement effects. Current–voltage and capacitance–voltag…
Abstract A new concept for the calculation of the mobile dislocation density in constitutive models is presented. In contrast to earlier approaches this concept does not use rate equations to calculate the evolution of the mobile dislocation density but is based on the minimization of the flow stress in each increment…
Double-wall carbon nanotubes are the molecular analogues to coaxial cables. Narrow diameter double-walled carbon nanotubes (DWNTs) have been obtained by catalytic chemical vapour deposition process with high yield and characterized by scanning and transmission electron microscopy. We examine the inelastic light scatte…
Abstract Poly(anhydride‐ester)s and poly(anhydride‐amide)s derived from both 4‐ and 5‐aminosalicylate acids (4‐ and 5‐ASA) were synthesized and characterized by physicochemical methods. Thermal and solubility characteristics directly correlated to the polymer backbone composition; polymers based on 5‐ASA had greater s…
We consider the relative stability of parallel and perpendicular lamellar layers on corrugated surfaces. The model can be applied to smectic phases of liquid crystals, to lamellar phases of short-chain amphiphiles, and to lamellar phases of long-chain block copolymers. The corrugated surface is modeled by having a sin…
In the present study poly(isoprene-block-ethylene oxide), PI-b-PEO, block copolymers are used to structure iron oxide and silica precursors into reverse mesophases, which upon dissolution of the organic matrix lead to well-defined nanoparticles of spheres, cylinders, and plates based on the original structure of the m…
Abstract The interaction of lattice dislocations with symmetric and asymmetric tilt grain boundaries has been simulated for different grain boundary misorientation angles by means of the molecular dynamics method using embedded atom method (EAM) potentials. An edge dislocation is equidistantly placed between a grain b…
Abstract Morphologies of polyethylene–ethylene/propylene/diene monomer (PE/EPDM) particles in 93/7 polypropylene (PP)/PE blends were investigated. SEM micrographs of KMnO 4 ‐etched cut surfaces and fracture surfaces of the blends revealed the existence of the “flake” structure. In the particles, crystalline PE formati…
Abstract Poly ( DL ‐lactic acid‐ co ‐glycolic acid)‐ co ‐poly(ethylene glycol) was synthesized by bulk ring‐opening polymerization of DL ‐lactide/glycolide/poly(ethylene glycol) using stannous chloride as an initiator. The molecular structure of the copolymer was analyzed by IR, 1 H NMR, and DSC. The degradation behav…
A two-LC, insulator-layer liquid crystal lens (LCL) is reported. The LCL can focus light waves of arbitrary polarizations and its power changes with applied voltage. The LCL exhibits good optical property. Its use as an image formation lens of variable magnifying power is demonstrated.
Abstract For Abstract see ChemInform Abstract in Full Text.
Abstract Statistical experimental design, that is, response surface methodology, was used to predict and explain the effects of rubber ratio, carbon black, and accelerator level on the cure characteristics and physical properties of natural rubber/bromobutyl rubber (NR/BIIR) blends. With these three independent variab…
We present a synthetic approach toward alloyed Cu/Zn nanoparticles using [Cu(OCH(Me)CH 2 NMe 2 ) 2 ] and Et 2 Zn as precursors. The thermolysis in the hot coordinating solvent hexadecylamine, HDA, leads to the formation of nanoscale, colloidal Cu/Zn systems with zinc contents (by EDX) of 5, 30, and 65%, respectively.…
Four groups of Si nanostructures with and without beta-SiC nanocrystals were fabricated for clarifying the origin of a blue emission with a double-peak structure at 417 and 436 nm. Spectral analyses and microstructural observations show that the blue emission is related to the existence of excess Si atoms in these Si…
Uniformly distributed Prussian blue nanoclusters with a thickness less than 50 nm were electrodeposited from an acidic solution containing only ferricyanide ions. The distinctive morphology of the deposited ultrathin layers of Prussian Blue ensures excellent performance in potassium ion-selective chemical sensors and…