Materials Literature
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This paper presents a simulation study of the packing of uniform fine-spherical particles where the van der Waals force is dominant. It is shown that porosity increases with the decreases of particle size from about 100 to 1 &mgr;m and the simulated relationship can match the literature data well. The packing structur…
We observed photon antibunching in the fluorescent light emitted from a single nitrogen-vacancy center in diamond at room temperature. The possibility of generating triggerable single photons with such a solid-state system is discussed.
A systematic study has been performed in order to find an appropriate medium for solubilization/dispersion of pristine single-walled carbon nanotubes (SWCNTs). Five solvents, all featuring high electron pair donicity (β) and low hydrogen bond parameter (α) have demonstrated the ability to readily form stable dispersio…
Nanostructured materials have many forms. One that has been somewhat neglected until recently is organogels, especially those whose three-dimensional structural networks are based on the self-assembly of low molecular-mass organic gelators (LMOGs). These thermoreversible materials consist of a small amount of LMOG and…
A broad review of the unusual one-dimensional properties of phonons in carbon nanotubes is presented, including phonons in isolated nanotubes and in crystalline arrays of nanotubes in nanotube bundles. The main technique for probing the phonon spectra has been Raman spectroscopy and the many unique and unusual feature…
We examine whether single molecule sensitivity in surface-enhanced Raman scattering (SERS) can be explained in the framework of classical electromagnetic theory. The influence of colloid particle shape and size, composition (Ag or Au) and interparticle separation distance on the wavelength-dependent SERS enhancement f…
Inorganic Research Laboratory, Chemistry Department, Dr H. S. Gour University, Sagar-470 003, India <em>Manuscript eeceived 26 October 1999, revised 21 February, 2000, accepted 25 March 2000</em> Complexes of Co<sup>II</sup>, Ni<sup>II</sup> and Cu<sup>ll</sup> have been synthesized with the Schiff bases prepared by c…
Molecular-based magnet nickel−iron cyanide, K 0.8 Ni 1.1 [Fe(CN) 6 ]·4.5H 2 O, was prepared by coprecipitation. The powder X-ray diffraction indicates an fcc crystal structure with a unit cell constant of 10.4 Å. Its Curie temperature was determined to be 28 K from the Curie−Weiss law. The effects of heat treatment on…
Tris(9,10-phenanthrenedioxy)cyclotriphosphazene forms inclusion adducts with a wide range of organic small molecules. This novel host molecule crystallized with p -xylene to form a triclinic 1:1 inclusion adduct, space group P 1̄ (No. 2), having unit cell of dimensions a = 12.724(3) Å, b = 19.347(5) Å, c = 9.124(5) Å…
The local structures of electrochemically deposited Cu on p-GaAs(100) of various coverages in 0.1 M H 2 SO 4 solution containing 0.1 mM CuSO 4 have been investigated by in situ surface-sensitive X-ray absorption fine structure (XAFS). The Cu K-edge extended X-ray absorption fine structure (EXAFS) and X-ray absorption…
ADVERTISEMENT RETURN TO ISSUEPREVResearch ArticleNEXTPreparation of Platinum Nanoparticles in Ethyl Acetate in the Presence of Poly(amidoamine) dendrimers with a Methyl Ester Terminal GroupKunio Esumi, Ryuhei Nakamura, Akihiro Suzuki, and Kanjiro TorigoeView Author Information Department of Applied Chemistry and Insti…
The surface properties of a polydisperse poly(vinycaprolactam) (48 kDa) have been studied at the air/water and hexane/water interfaces. Adsorption of the polymer at both interfaces shows substantial time-dependent surface tension lowering at remarkably low concentrations in the aqueous phase. This adsorption is increa…
A thin film of copper(I) oxide (thickness ∼9 Å), grown on a Cu(111) crystal, was used as a model photocatalyst for decomposition of D 2 O using ultraviolet light ( h ν = 1.55−6.21 eV). No evidence for water photosplitting was observed. The experimental uncertainties establish an upper limit of 2 × 10 -21 cm 2 for the…
The critical points of condensation in Coulomb systems are described here by a modified van der Waals equation of state taking into account a many-particle exchange interaction between virtual atoms with overlapping classically accessible spheres of valence electrons. A characteristic feature of the Coulomb critical p…
The deposition of a dye-doped mesostructured silica/block copolymer thin film on a mesoporous thin film, itself deposited on an optical fiber, represents a new way to laser materials. The microring laser implemented exhibits a low threshold (∼1.5 kW cm-2) and can be operated under ambient conditions for several tens o…
Solid solutions Ce 1 - x RE x O 2 - δ (RE = Eu, Tb) were prepared by a high-temperature and -pressure method. The products were characterized by X-ray diffraction (XRD), TG, electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS), and Mössbauer spectroscopy. XRD data analysis showed that all soli…
Self-complexation of triblock copolymers based on undeca- and heptadecathiophene cores attached to generation three Fréchet-type poly(benzyl ether) dendrons in solution at low temperature leads to the formation of relatively small but well-defined supramolecular assemblies. The formation of these aggregates is associa…
Metalladendrimers of generation 3 with either 24 terminal palladium or ruthenium diphosphine complexes or one ruthenium diphosphine complex located at the core have been found to be efficient, recoverable catalysts in three general organic reactions: Stille couplings, Knoevenagel condensations, and Michael additions.
Ultrathin, passivating films are attractive for protecting metal surfaces without completely masking substrate properties. Alternating polyelectrolyte deposition of layered poly(acrylic acid)/poly(allylamine hydrochloride) (PAA/PAH) films on Al produces ultrathin coatings that protect Al from Cl - -induced corrosion.…
We report the uniform planar anchoring of thermotropic liquid crystals on films of bovine serum albumin (BSA) covalently immobilized on the surface of glass microscope slides and mechanically rubbed using a cloth. The azimuthal orientations of the liquid crystals were measured to be parallel to the direction of rubbin…