Materials Literature
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The progress of the interfacial reaction of polystyrene chains end-capped by a primary amine (PS-NH 2 ) and PMMA chains end-capped by an anhydride (PMMA-anh) has been monitored by SEC-UV, by using anthracene-labeled polystyrene chains (anth-PS-NH 2 ) as a probe. Assemblies of an anth-PS-NH 2 layer and a PMMA-anh layer…
The adsorption and decomposition reactions of dimethyl methylphosphonate (DMMP) on cerium and iron oxides supported on aluminum oxide have been examined at 25 °C. The capacities of these solids for the decomposition of DMMP have been measured, and the identities and amounts of the decomposition products determined. Th…
An analysis of the edge effect in high-frequency transformers is performed by modeling the winding as either all-foil or wire-foil. The effects of the winding positions in the core and the winding widths on the AC resistance and leakage inductance of the transformer are investigated by using the two-dimensional finite…
A very clean route to porous materials , utilizing the combination of conventional solution and supercritical fluid processing, is exploited to prepare porous tissue engineering scaffolds that contain biologically active material for controlled release. This allows accurate dosing of the biological agent, whilst retai…
Abstract The electrochemical deposition of Au/Co multilayers into 20 μm‐thick ion track etched polycarbonate membranes with pore diameters of 110–150 nm was studied in a single electrolyte containing cobalt sulfate, gold cyanide, and citric acid. Cyclic voltammetry, chronoamperometry, and pulse‐potential experiments w…
Proteins that distinguish the crystallographic planes of zeolites have been identified. On EMT zeolite the proteins obscure only the (001) face and are able to immobilize an enzyme with negligible loss of activity (see dye‐exclusion assay, Figure). A general method for isolating proteins able to distinguish spatial or…
A study several of available technologies used to construct low-profile, planar transformers is presented. Finite element analysis is used to determine an appropriate winding configuration with low AC resistance and leakage inductance. The advantages and disadvantages of printed circuit board (PCB), flex-circuit and s…
A full procedure to model high frequency magnetic components has been developed. A finite element analysis (FEA) tool is used to compute the frequency behavior of the windings, taking into account geometry and frequency effects, like skin, proximity, interleaving, gap and end effects. The capacitive effects among the…
Some recent theory in the area of rubberlike elasticity is illustrated by the analysis of strain-induced crystallization, chain entanglements in networks through constraint models, junction fluctuations and neutron scattering, and phase separations in oriented gels. Experimental techniques for characterizing elastomer…
A new polyoxometalate derivative {PW9V3O40[Ag(2,2′-bipy)]2[Ag2(2,2′-bipy)3]2} 1 has been hydrothermally synthesized and structurally characterized by the single crystal X-ray diffraction. X-Ray analysis showed that both [Ag(2,2′-bipy)]+ and [Ag2(2,2′-bipy)3]2+ units are supported on the α-Keggin polyoxoanion [PW9V3O40…
The effect of zeolite composition and structure on XPS core level binding energies has been studied for a large class of zeolites (FAU, MFI, MOR, LTA) differing in their counterions (Na, K, Rb, Ca, Mg, Ba) and Si:Al ratio (1 to 160). Whereas absolute binding energies cannot be determined to any reasonable degree of ac…
A new transformer model for a multiple-winding transformer, which describes the leakage phenomenon, is presented. The unique feature of the model is that each parameter in the model corresponds to a physical magnetic flux. The model parameters can be determined by using the finite element tool. The model can also be c…
Growth of and hydrogen production by wild-type (WT) Rhodovulum sulfidophilum were compared with those by one of its mutants lacking the poly(3-hydroxybutyrate) (PHB) biosynthesis ability (PNM2). During phototrophic growth under aerobic conditions with fixed illumination, changes in the extinction coefficient and PHB c…
Abstract New cholesterol-based gelators bearing a 4-, 3-, or 2-pyridyl group (1, 2, or 3, respectively) have been designed. Compound 1 gelled 16 of the 19 solvents tested, indicating that 1 acts as a very versatile gelator. The gelation ability of compound 2 was significantly improved by added AgOTf, owing to an Ag(I)…
Spectroscopic studies involving dielectric, submillimeter, infrared, and Raman measurements were performed on a ${\mathrm{CaTiO}}_{3}$ single crystal, covering a broad spectral range (static to 10 THz) at temperatures from 6 to 300 K. The results show mode softening characteristic of an incipient ferroelectric with ${…
A family of polymers based on alternating bi‐EDOT and pyridine units is reported. Poly(BEDOT‐PyrPyr‐Ph 2 ), with a bandgap of 1.2 eV, has four electrochemically accessible colors (dark gray, burgundy, lime green, and light gray) each corresponding to a distinct redox state. In‐situ conductance measurements illustrate…
We describe recent developments in the synthesis of semiconductor nanoparticles, which lead to a substantial improvement of the luminescence quantum efficiency. Concerning a theoretical model for the growth of an ensemble of nanoparticles, the highest quantum efficiencies are achieved in particles that grow under cond…
Single wall carbon nanotubes (SWCNTs) synthesized by the recently developed HiPco® method differ from those obtained by other techniques because their diameter distribution is broader and is centered at a smaller value. Therefore, HiPco® samples contain an unusual wide selection of different nanotubes. Combining this…
Iron containing nanoparticles are found to spontaneously form on hydroxylated SiO 2 substrates when immersed in a freshly mixed aqueous solution of FeCl 3 and hydroxylamine. Upon calcination, a submonolayer of uniformly distributed iron oxide nanoparticles can be derived and used to catalyze the growth of single-walle…
The size-selective photoetching technique was used to control the size of a CdS nanoparticle inside a silica shell. With monochromatic light irradiation, the diffuse reflectance spectra of silica-coated CdS nanoparticles were blue-shifted, and the size of the resulting CdS nanoparticles incorporated in the silica shel…