Materials Literature
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The emission spectra and the lifetimes of the lasing transition ${}^{4}{I}_{13/2}{\ensuremath{-}}^{4}{I}_{15/2}$ in ${\mathrm{Er}}^{3+}$-doped ${\mathrm{TeO}}_{2}{\ensuremath{-}\mathrm{Z}\mathrm{n}\mathrm{O}\ensuremath{-}\mathrm{N}\mathrm{a}}_{2}\mathrm{O}$ ternary glasses have been studied. The investigation includes…
Experimental results show that a nanolayered composite structure made of two kinds of metals strengthens dramatically as the layer thickness is reduced. In epitaxial systems, this strengthening has been attributed to the modulus, lattice parameter, gamma surface and slip-plane mismatches between adjacent layers. The m…
To probe the one-dimensional nature of single-wall carbon nanotubes (SWNTs) in bulk samples, we have devised a simple method for generating fibers of aligned SWNTs. We measured polarization-dependent Raman spectra on the oriented fibers. Contrary to what is expected from their theoretically assigned vibration-mode sym…
Targeted three-dimensional networks with unprecedented porosity (nanoporosity) can be designed from first principles. The diversity of nodes and ligands available allows fine tuning of the molecular recognition features of these porous solids. The materials so far prepared, for example [{Cu(4,4′-bipy)2}n](SiF6)n (see…
A new approach to the characterization of the mechanical and electrical properties of individual nanowires and nanotubes is demonstrated by in-situ transmission electron microscopy (TEM). The technique allows a one-to-one correlation between the structure and properties of the nanowires. Recent developments include th…
ABSTRACT: Effects of formulation (lipid presence, type of starch, and plasticizer) on microstructure, water vapor (WVP) and gas (GP) permeabilities of films and coatings were analyzed. Plasticizer was necessary to maintain film and coating integrity and to avoid pores and cracks. Films made from high amylose starch sh…
A new electrodeposition method for making porous ZnO layers with highly oriented and columnar morphology is reported here. A monolayer of dye is adsorbed onto the ZnO followed by electrodeposition of p-type CuSCN to create a complete inner-surface electrical contact, resulting in a bicontinuous-network heterojunction…
Relaxor ferroelectric single crystals Pb((Mg 1/3 Nb 2/3 ) 1- x Ti x )O 3 (PMNT 100(1- x )/100 x ) were grown directly from melt by a modified Bridgman technique. The segregation during the growth of PMNT single crystals was studied by means of differential thermal analysis (TGA), thermogravimetric analysis (DTA), X-ra…
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…