Materials Literature
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Abstract The thermal properties of poly(ethylene terephthalate) (PET) conventional fibers and microfibers are measured and compared to bulk samples. It is shown that the glass transition temperature ( T g ) of the fibers can be monitored with modulated differential scanning calorimetry (MDSC). The T g region is about…
A metal–carbon nanotube (CNT) composite has been synthesized by the authors simply by dispersing CNT's in a suitable electrolyte solution and depositing the metal in an electroless manner. The thus‐obtained CNT/Ni‐P coatings exhibit superior mechanical properties such as high hardness and excellent wear resistance. Th…
The local structure of the ${\mathrm{MnO}}_{6}$ octahedron in ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ was investigated by Mn K-edge x-ray absorption fine structure at $T\ensuremath{\approx}10\mathrm{K}$ and room temperature as a function of x $(0<~x<~0.475).$ For both temperatures,…
In the differential scanning calorimetry (DSC) scans of the annealed states of vapor-deposited, hyperquenched, and crystal-amorphized solids, the glass-softening or T g endotherm is interrupted by the crystallization exotherm, thus making the T g endotherm appear like a rounded peak. This apparent peak is occasionally…
The mechanism of energy transport in branching structures is suggestively related to the geometry of the multichromophore architecture. In organic conjugated dendrimers, both incoherent (hopping) and coherent energy transfer processes have been observed from different dendritic architectures with different building bl…
In this work, the results of a new method for the preparation of porous silicon (PS) layers with in situ simultaneous functionalization with organic molecules are reported. The molecules of interest are dissolved in the HF ethanoic solution used to prepare the PS layers by partial anodic dissolution of a Si electrode.…
The design of an advanced solid breeding blanket in a DEMO reactor requires a tritium breeder and a neutron multiplier that can withstand high temperatures and high neutron fluences, and the development of such advanced blanket materials has been carried out by collaboration between JAERI, universities and industries…
Abstract Microporous cellulose acetate membranes were prepared by a thermally induced phase separation (TIPS) process. Two kinds of cellulose acetate with acetyl content of 51 and 55 mol % and two kinds of diluents, such as 2‐methyl‐2,4‐pentandiol and 2‐ethyl‐1,3‐hexanediol, were used. In all polymer‐diluent systems,…
Second-harmonic generation has been studied for fundamental wavelengths from 720 to 1100 nm on high-quality ZnO thin films deposited on sapphire substrates by laser molecular beam epitaxy. The second-order nonlinear susceptibility components increase dramatically as the second-harmonic frequency approaches the ZnO ban…
The magnetization and Faraday effect in the wavelength range of 350–850 nm have been measured for zinc ferrite thin film prepared by the sputtering method. X-ray diffraction analysis indicates that the thin film is single-phase ZnFe 2 O 4 , whose crystallite size evaluated from Scherrer’s equation is 10 nm or so. The…
Abstract A new polyimide composite was developed relying on the concept of in situ polymerization of monomer reactants polyimide. High thermal conductive, low dielectric constant and dielectric loss, and thermal‐stable composites were successfully demonstrated by incorporating aluminum nitride powder into the polyimid…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTElectrodeposition of Porous Silicate Films from Ludox Colloidal SilicaMaryanne M. Collinson, Nathan Moore, P. N. Deepa, and Mandakini KanungoView Author Information Department of Chemistry, Kansas State University, Manhattan, Kansas 66506-3701 Cite this: Langmuir 2003, 19, 18,…
Abstract The structures of the intumescent charred layers formed from expandable graphite (EG)‐based intumescent halogen‐free flame retardant (HFFR) linear low‐density polyethylene (LLDPE) blends and their flame‐retardant mechanism in the condensed phase have been studied by dynamic Fourier transform infrared (FTIR),…
Crystallographic and magnetic structures of the cubic NaZn 13 -type intermetallic compound LaFe 11.4 Si 1.6 have been studied by means of powder neutron diffraction. Rietveld analysis indicates that Si atoms substitute for Fe atoms randomly on two different Fe sites. All spins in the unit cell are aligned ferromagneti…
Generally, the entropy of the supercooled liquid decreases more rapidly than that of the crystal. Thus, the former, if we extrapolate it smoothly below the glass-transition temperature T(g), becomes equal to the latter at the so-called Kauzmann temperature T(K). Further extrapolation below T(K) leads to the unphysical…
We report on the growth of single cubic-phase MgZnO thin films by reactive electron beam evaporation on sapphire substrates. A detailed theoretical procedure has been employed to analyse the transmission profile for information on composition non-uniformity, in addition to the exact determination of the band gap energ…
Higher density of ZrB 2 ceramics than with the pure material is achieved when 4.6 % of aluminum nitride are added before hot‐pressing as a sintering aid. AlN supports densification and prevents grain coarsening, mainly by virtue of its ability to remove the boron oxide layer that otherwise covers ZrB 2 particles. The…
Abstract Nitrile rubber (NBR)–clay nanocomposites were prepared by co‐coagulating the NBR latex and clay aqueous suspension. Transmission electron microscopy showed that the silicate layers of clay were dispersed in the NBR matrix at the nano level and had a planar orientation. X‐ray diffraction indicated that there w…
Abstract Our previous work showed that drawing polyamide 66 (PA 66) fibers at room temperature does not change the degree of crystallinity, but only increases the molecular orientation. We therefore have used a series PA 66 fibers with different draw ratios to establish a direct correlation between (noncrystalline) mo…
A many-body theory of paramagnetic Kondo insulators is described, focusing specifically on single-particle dynamics, scattering rates, d.c. transport and optical conductivities. This is achieved by development of a non-perturbative local moment approach to the symmetric periodic Anderson model within the framework of…