Materials Literature
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Catalytic graphitisation of carbon was used to explain the synthesis of carbon nanotubes from acetylene using the catalytic chemical vapour deposition method. This was achieved by comparing the kinetics of synthesis of carbon nanotubes at varying acetylene concentrations and different operating temperature ranging fro…
The anisotropy of the structure in a die‐pressed compact was studied directly through detailed analysis by confocal scanning laser fluorescent micrographs. The use of confocal optics and an immersion liquid produced micrographs that represented the structure of a cross section at a certain depth along two directions:…
Abstract Electrical properties of UV‐curable co ‐polyacrylate/silica nanocomposite resins prepared via sol‐gel process for device encapsulation were investigated. It was found that, by appropriate UV curing process and the formation of nanoscale silica particles finely dispersed in the resin matrix, the leakage curren…
Thermodynamic calculations with first principles density functional theory are carried out to estimate the free energies of various doped metal hydride systems. We consider doped destabilized hydride reactions of the form ${X}_{1--x}{Y}_{x}{\mathrm{H}}_{2}+2\mathrm{Li}\mathrm{B}{\mathrm{H}}_{4}\ensuremath{\rightarrow}…
The photophysical and photoelectrochemical properties of first- and second-generation dendrimers with ruthenium tris-bipyridine peripheral groups and a tri-viologen like core (Ru3V3 and Ru6V3) were investigated in solution and when embedded within assembled films. The stepwise assembly of these dendrimers on quartz an…
We have prepared quinacridone (QA) colloids with various particle sizes (25−120 nm) and different crystalline phases by nanosecond laser ablation of its microcrystalline powder dispersed in water and fabricated the prepared colloidal particles into homogeneous films on an indium-tin-oxide electrode by an electrophoret…
Magnetization and x-ray powder diffraction studies have been performed on a polycrystalline sample of ${\mathrm{Dy}}_{5}{\mathrm{Si}}_{3}\mathrm{Ge}$ compound. This compound has a monoclinic crystal structure (${\mathrm{Gd}}_{5}{\mathrm{Si}}_{2}{\mathrm{Ge}}_{2}$-type, space group $P{112}_{1}∕a$) at room temperature.…
The structure and hydrogen bonding of water incorporated in a thin film of amphoteric terpolymers composed of various ratios of MA, DMAPMA, and BMA were analyzed using the band shapes of the O--H stretching in the IR spectra. At an early stage of sorption of water, the IR spectrum for the water incorporated in the fil…
Solid phosphoric acid (SPA), silicated amorphous silica−alumina (ASA) catalysts (1.5−70% SiO 2 ), and zeolites beta (BEA), mordenite (MOR), and ZSM-5 (MFI) were investigated for the alkylation of phenol with 1-octene. All catalysts were active for phenol alkylation at 200 °C in batch reactors, with olefin oligomerizat…
Silver nanodimers with a small gap of a few nanometers aligned on glass substrates were used to enhance hyper-Raman scattering of crystal violet dye molecules. When localized surface plasmon of the dimer array was resonantly excited along the interparticle axis, hyper-Raman intensity was significantly enhanced. Moreov…
In the search for hydrogen-storage materials with a high gravimetric capacity, Mg(y)Ti((1-y)) alloys, which exhibit excellent kinetic properties, form the basis for more advanced compounds. The plateau pressure of the Mg--Ti--H system is very low (approximately 10(-6) bar at room temperature). A way to increase this p…
We present a study of the growth of the p-type inorganic semiconductor CuI on n-type TiO2 anatase single crystal (101) surfaces and on nanoparticulate anatase surfaces using synchrotron radiation photoemission spectroscopy. Core level photoemission data obtained using synchrotron radiation reveal that both the substra…
A coarse-grained model has been developed for simulating the self-assembly of nonyl-tethered polyhedral oligomeric silsesquioxane (POSS) nanoparticles in solution. A mapping scheme for groups of atoms in the atomistic molecule onto beads in the coarse-grained model was established. The coarse-grained force field consi…
The melting behavior of double crystalline poly(ε-caprolactone)- block -polyethylene (PCL- b -PE) copolymers, crystallized at various temperatures T c below the melting point of both blocks, has been investigated by time-resolved small-angle X-ray scattering with synchrotron radiation (SR−SAXS), conventional wide-angl…
This paper presents a systematic approach for finding efficient boundary conditions for molecular dynamics simulations of crystalline solids. These boundary conditions effectively eliminate phonon reflection at the boundary and at the same time allow the thermal energy from the bath to be introduced to the system. Our…
Abstract N ‐(4‐nitrophenyl)‐4′,4″‐bisformyl‐diphenylamine was synthesized from N ‐(4‐nitrophenyl)‐diphenylamine by the Vilsmeier‐Haack reaction. Soluble aromatic poly(azomethine)s (PAMs) were prepared by the solution polycondensation of N ‐(4‐nitrophenyl)‐4′,4″‐bisformyl‐diphenylamine and aromatic diamine in N ‐methyl…
The gold and nickel bisdithiolene complexes based on new highly extended ligands incorporating fused tetrathiafulvalene and thiophene moieties (alpha-tdt=thiophenetetrathiafulvalenedithiolate and dtdt=dihydro- thiophenetetrathiafulvalenedithiolate), were prepared and characterised by using cyclic voltammetry, single c…
We report here a fast approach to the synthesis of cubic Cu nanocages in higher yield through a wet chemical reductive procedure. The performing reductive reactions from Cu(II) to Cu(0) in the aqueous phase can be finished in just 3 min at the low temperature of 80 °C in the presence of sodium oleate (SOA) as a stabil…
We have developed a semiempirical method to obtain interlayer binding energy of graphite in the previous work [M. Hasegawa and K. Nishidate, Phys. Rev. B 70, 205431 (2004)]. In the present paper, we revisit this approach and develop an improved method, in which ab initio calculations based on the density functional th…
Nanoparticles of nickel–zinc ferrite prepared across the solid solution compositional range by aqueous precipitation at 100°C are all found to have both a larger lattice parameter and a lower saturation magnetization than bulk forms of the same compositions. The lower saturation magnetization is attributed to a combin…