Materials Literature
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ZnS quantum dots are synthesized by a high-temperature chemical route with narrow size distribution at diameters of 1.4 and 1.8 nm. Significantly small size dispersion of 1.4-nm-sized ZnS quantum dots is vivid from the transmission electron microscopic measurements. The nonlinear absorption is measured at wavelengths…
The mechanical integrity of single-walled carbon nanotubes for bending and torsional deformations is evaluated using molecular dynamics simulations. A cantilever type nanotube loaded by a follower lateral force at the free end of the tube exhibits an unstable local buckling near the fixed end. A hysteresis loop is obs…
Using time resolved optical depolarization, we have studied the rotational behavior of molecular probes in supercooled liquids near the glass transition temperature T(g). Simultaneously, the dynamics of the liquid immediately surrounding these rigid probes is measured by triplet state solvation experiments. This direc…
Differences in mosaicity between lysozyme crystals grown inside and outside a homogeneous magnetic field of 2.4 T and with and without agarose gel were investigated by X-ray diffraction rocking-curve measurements. High angular resolution was achieved using an Si(113) four-reflection Bartels monochromator. The results…
The relative weight, delta(Beta), of the yield of secondary electrons, SE(2), induced by the backscattered electrons, BSE, with respect to that, delta(P), of secondary electrons, SE(1), induced by the primary electrons, PE, is deduced from simple theoretical considerations. At primary energies E(0) larger than E(M) (w…
Ag sol prepared by the citrate-reduction method is a promising surface-enhanced Raman scattering (SERS) substrate that can be activated not only by 514.5 nm radiation but also by 568 nm and 632.8 nm radiation. Using these facts, the SERS of benzyl phenyl sulfide (BPS) in silver sol is revisited to assess the excitatio…
The refractive index and density of silica glass were measured for various fictive temperatures. They both increase without any local maxima, as the fictive temperature increases up to 1550°C. From the relationship between the refractive index and the density, polarizability was estimated using the Lorentz-Lorenz form…
Au:CdS nanocomposite film was investigated using femtosecond pump–probe measurement at 800 nm. Time dependence of transmittance shows a two-photon absorption followed by a saturable absorption and recovery process, which clearly demonstrates that resonant energy transfer between CdS and Au nanocomposite systems occur…
An amyloid fibril is a highly ordered, insoluble form of protein that results when a normally soluble protein aggregates via a self-association process to form a structured nanotube. Such fibrils can now be routinely generated from purified proteins in the laboratory, and have attracted burgeoning interest due to thei…
The measurement of the bulk purity of single-walled carbon nanotubes (SWNTs) is an important outstanding problem. We report a solution-phase near-IR (NIR) spectroscopic study of a range of carbon materials with an emphasis on SWNTs, and we show that NIR spectroscopy is an extremely powerful tool in the assessment of t…
Dynamic properties of dilute solutions of neutral and charged dendrimers with explicit excluded-volume, electrostatic, and hydrodynamic interactions have been investigated by Brownian dynamics simulation. Three different types of motions in dendrimers up to g = 5 generations have been considered: the motion of a dendr…
Enzyme-catalyzed synthesis of a phenolic polymer within layer-by-layer (LbL) constructed polyelectrolyte microcapsules has been introduced. This approach is based on selective permeability of capsule walls for monomer molecules, while biocatalyst and forming polymeric chains cannot leave capsules interior because of h…
The role of S mixing in the quantum tunneling of the magnetization in nanomagnets has been investigated. We show that the effect on the tunneling frequency is huge and that the discrepancy (more than 3 orders of magnitude in the tunneling frequency) between spectroscopic and relaxation measurements in Fe(8) can be res…
We have studied the surface morphology of symmetric poly(styrene)-block-poly(methyl methacrylate) diblock copolymer thin films after solvent vapor treatment selective for poly(methyl methacrylate). Highly ordered nanoscale depressions or striped morphologies are obtained by varying the solvent annealing time. The resu…
Heteroepitaxial growth of cubic boron nitride (cBN) on diamond using fluorine-assisted chemical vapor deposition is reported. Since cBN grown on diamond shows extraordinary film adhesion and stability, diamond serves as a universal intermediate layer for growing cBN films on a host of materials. The Figure illustrates…
Contrary to popular belief, the slipperiness of graphite is not an intrinsic property. The presence of vapors, such as water, is required for graphite to lubricate; in vacuum or dry environments, the friction and wear rate of graphite are high. A widely accepted explanation involves weakening of the binding force betw…
In the present paper, we successfully prepared PbS microcrystals with a flower-shaped structure in a simple aqueous system using microwave irradiation and systematically researched various factors affecting the growth of the flower-shaped PbS crystals. Experimental results indicated that the change of the molar ratio…
Thermosensitive poly(organophosphazenes) bearing α-amino-ω-methyl-poly(ethylene glycol) (AMPEG), some hydrophobic amino acid esters, and a depsipeptide ethyl ester (ethyl-2-( O -glycyl)glycolate) as a hydrolysis-sensitive moiety have been synthesized. Most of the poly(organophosphazenes) synthesized showed sol−gel tra…
A crystal structure is proposed for reduced barium titanate, BaTiO3−δ, δ≈0.33, formed during the degradation of Ni–BaTiO3 X7R multilayer ceramic capacitors. High-resolution transmission electron microscopy and selected-area electron diffraction have been used in combination with computer simulations to show that oxyge…
Microscale helical coils consisting of a composite of one conducting and one nonconducting polymer were produced using electrospinning. The nonconducting polymer was poly(ethylene oxide) and the conducting polymer was poly(aniline sulfonic acid). The coil structures were studied over a range of processing conditions a…