Materials Literature
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A method is presented which allows the study of diameter selective reactions in single-wall carbon nanotubes with an unprecedented accuracy. It is based on the transformation of fullerene peapods into double-wall carbon nanotubes and the study of the resulting diameter distribution of the inner nanotubes with Raman sp…
The precursor powders of Ca 3 Co 4 O 9 were synthesized by a sol–gel method. The results of X‐ray diffraction and thermogravimetric and differential thermal analyses patterns indicate that pure Ca 3 Co 4 O 9 powders could be obtained by calcining the precursor at 800°C for 2 h. High dense Ca 3 Co 4 O 9 ceramic samples…
In this review we describe the development of photoemission spectroscopy (PES) from the first historic observations of the photoelectric effect by Hertz and Hallwachs to state-of-the-art experiments. We present several examples for the application of PES for chemical analysis of solids (ESCA), the determination of the…
We report a detailed theoretical study of the bonding and conduction properties of an hydrogen molecule joining either platinum or palladium electrodes. We show that an atomic arrangement where the molecule is placed perpendicular to the electrodes is unstable for all distances between electrodes. In contrast, the con…
Re(x)W(1-x)O3.H2O and Re(x)W(1-x)O3 phases are prepared by a new organometallic chimie douce concept employing the organometallic precursor methyltrioxorhenium.
A photoresponsive dithienylethene derivative bearing chiral pinene-based arms underwent a stereoselective photoinduced cyclization reaction to produce greater than 98% of a single diastereomer. The magnitude of the optical rotation changed as much as Delta[alpha]373 = 8698 degrees upon alternate irradiation with 400 n…
Materials presenting a stable and reversible switch of physical properties in the solid state are of major interest either for fundamental interests or potential industrial applications. In this context, the design of metal complexes showing a light-induced crossover from one spin state to another, leading to a major…
The present research describes a simple low‐temperature synthesis route of preparing bismuth ferrite nanopowders through soft chemical route using nitrates of Bismuth and Iron. Tartaric acid is used as a template material and nitric acid as an oxidizing agent. The synthesized powders are characterized by X‐ray diffrac…
The preparations of (K 0.5 Na 0.5 )NbO 3 (KNN)‐based ceramics were studied as lead‐free piezoelectric materials. The authors found that the addition of CuO greatly enhanced the sinterability of the KNN‐based ceramics. The sinterability and piezoelectric properties of these ceramics were dependent upon the A/B ratio, C…
Tubular structure of nanoparticles is highly attractive due to their structural attributes, such as the distinctive inner and outer surfaces, over conventional spherical nanoparticles. Inner voids can be used for capturing, concentrating, and releasing species ranging in size from large proteins to small molecules. Di…
We report on the preparation and structural characterization of CdSe nanocrystals, which are covered by a multishell structure from CdS and ZnS. By using the newly developed successive ion layer adhesion and reaction (SILAR) technique, we could gradually change the shell composition from CdS to ZnS in the radial direc…
The present paper introduces to the problems related with the application of silica shells to luminescent semiconductor nanocrystals, especially for bioanalytical applications. Two examples for the preparation of silica shells are presented: First, preparation of a very thin silica layer with simultaneous functionalis…
Abstract A structural and electrochemical investigation of dimerization and Baker–Figgis (rotational) isomerization in the tri‐ferric‐substituted silicotungstates has been undertaken because these phenomena are important in a large number of polyoxometalates. A single‐crystal X‐ray diffraction analysis of K 4 Na 7 [(β…
High-pressure x-ray powder diffraction has been measured on the half doped rare earth manganite ${\mathrm{Nd}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3}$ up to a pressure of 15 GPa. We report the presence of a quantifiable amount of shear distortion of the ${\mathrm{MnO}}_{6}$ octahedra in ${\mathrm{Nd}}_{0.5}{\mathr…
Fuel reprocessing plant is one of the most important sources of anthropogenic (14)C in the environment. A method was developed to determine the amount and chemical composition of airborne (14)C release from the Tokai reprocessing plant, Japan. Effluent monitoring using this method showed most of the (14)C is released…
Single crystals of pure and doped bis(thiourea) cadmium chloride (BTCC) belonging to semiorganic nonlinear optical materials are grown by slow evaporation technique. The lattice parameters of the grown crystals are determined by single-crystal XRD. Single crystal XRD studies reveal that the incorporation of metallic d…
Critical behavior, scaling, and nonlinear properties of the susceptibility ${\ensuremath{\chi}}^{*}={\ensuremath{\chi}}^{\ensuremath{'}}\ensuremath{-}i{\ensuremath{\chi}}^{\ensuremath{''}}$ in $^{18}\mathrm{O}$ isotope exchanged $\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}_{3}$ are revisited in a crystal that was perfectly sin…
The phonon density of states in equilibrium and nonequilibrium solid argon was analyzed with the molecular-dynamics method and using the Lennard-Jones interaction. The computational method was validated by comparing the thermal conductivity and its finite-size effect to reference data. A small, but statistically signi…
Abstract In this article, a Haake torque rheometer equipped with an internal mixer is used to study the influence of the amount of sodium montmorillonite (Na + ‐MMT) and organically modified MMT (O‐MMT) on the characteristics of rigid poly (vinyl chloride) (PVC)/Na + ‐MMT and PVC/O‐MMT nanocomposites, respectively. It…
Poly(bromooctaphenylsilsesquioxane)s (Br x OPS) are easily synthesized from octaphenylsilsesquioxane (OPS) via bromination with Br 2 /Fe in dichloromethane. For Br:OPS ratios less than 8:1, singly brominated products are obtained with 65−70% para substitution, 25−20% meta substitution and the remainder ortho. Higher r…