Materials Literature
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Optical band gaps for a set of 23 ternary and quaternary sulfide minerals have been measured by diffuse reflectance spectroscopy. Comparison of band gaps measured by diffuse reflectance with band gaps determined by single-crystal methods for 12 binary sulfides demonstrates that the diffuse reflectance measurement prod…
Electrodeposited nanocrystalline Ni foils were studied by high-resolution X-ray diffractometry. The full width at half-maximum and Fourier coefficients were found to vary rather anisotropically as a function of diffraction order. The modified Williamson–Hall plot and the modified Warren–Averbach analysis, developed re…
We consider the distinguished limits of the phase field equations and prove that the corresponding free boundary problem is attained in each case. These include the classical Stefan model, the surface tension model (with or without kinetics), the surface tension model with zero specific heat, the two phase Hele–Shaw,…
For any particular stainless steel, a critical pitting temperature (CPT) can be measured, below which stable pits do not occur at any potential up to the onset of transpassivity. The more highly alloyed the steel, particularly with molybdenum, the higher the CPT. The CPT for 904L austenitic stainless steel with a 240…
▪ Abstract High-temperature polymers have found widespread use in aerospace and electronics applications. This review deals with recent developments in the chemistry of these materials that have led to improvements in processability and high-temperature stability.
A new preparation method for a highly sinterable yttria powder has been developed, the resultant powder characterized, and its sinterability studied. As a precursor of the yttria powder, a fine and needle‐shaped yttrium carbonate was prepared by a precipitation and aging method. A fine and low‐agglomeration yttria pow…
The origin of the appearance of the morphotropic phase boundary in the perovskite-type oxide solid solution systems and the increase in the dielectric susceptibilities in the vicinity of the boundary is theoretically clarified on the basis of a Landau-type free energy function. The dielectric susceptibilities are conc…
A method to calculate the optical functions n(lambda) and k(lambda) by use of the transmission spectrum of a dielectric or semiconducting thin film measured at normal incidence is described. The spectrum should include the low-absorption region and the absorption edge to yield the relevant optical characteristics of t…
The thermal degradation of a series of polybenzoxazines based on bisphenol A and various aliphatic amines has been studied. Using the hyphenated techniques of thermogravimetric analysis-Fourier transform infrared spectroscopy (TGA-FTIR), and gas chromatography-mass spectrometry (GC-MS), the mechanisms of thermal decom…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA Thermally Switchable Molecular Lock. Guest-Templated Synthesis of a Kinetically Stable Nanosized CageFumiaki Ibukuro, Takahiro Kusukawa, and Makoto FujitaView Author Information The Graduate University for Advanced Studies Myodaiji, Okazaki 444-8585, Japan Coordinati…
Nonwoven meshes of polyglycolic acid (PGA) fibers are attractive synthetic extracellular matrices (ECMs) for tissue engineering and have been used to engineer many types of tissues. However, these synthetic ECMs lack structural stability and often cannot maintain their original structure during tissue development. Thi…
In this concise handbook leading experts give a broad overview of the latest developments in this emerging and fascinating field of nano-sized materials. Coverage includes new techniques for the synthesis of nanoparticles as well as an in-depth treatment of their characterization and chemical and physical properties.…
The study of Mn(IV)-rich manganites ${\mathrm{Ca}}_{1\ensuremath{-}x}{\mathrm{Sm}}_{x}{\mathrm{MnO}}_{3}$ with low electron content corresponding to $0<~x<~0.12$ demonstrates the large difference of their electronic and magnetic properties with that of Mn(III)-rich manganites. In particular, a metalliclike tempe…
Abstract MFI membranes were prepared as free‐standing and supported films on porous alumina disks and nonporous substrates. They were synthesized using secondary growth of precursor layers. For self‐supported films the first step was to prepare an alumina–silicalite composite film, while for supported films the substr…
The pressure-temperature phase diagram of a one-component system, with particles interacting through a spherically symmetric pair potential in two dimensions, is studied. The interaction consists of a hard core plus an additional repulsion at low energies. It is shown that at zero temperature, instead of the expected…
▪ Abstract Materials that contract on heating are unusual and have important applications. Materials showing such negative thermal expansion behavior are usually anisotropic and usually exhibit this behavior over only a small temperature range. The zirconium tungstate family is unique in showing strong negative therma…
Equilibrium structures and thermodynamic properties of dodecanethiol self-assembled monolayers on small (Au 140 ) and larger (Au 1289 ) gold nanocrystallites were investigated with the use of molecular dynamics simulations. Compact passivating monolayers are formed on the (111) and (100) facets of the nanocrystallites…
Using Monte Carlo simulations, we demonstrate that the shape of the intramolecular density profile of dendritic polyelectrolytes in solution can be tailored by varying the ionic strength of the solvent. Further, we find that a reversible transition between a “dense core” and a “dense shell” dendritic structure may be…
We report on the viscoelastic behavior of linear thermoplastic nonpolar hybrid inorganic–organic polymers. These materials have been synthesized through copolymerization of an oligomeric inorganic macromer with 4-methylstyrene where the inorganic portion of the material is a well-defined polyhedral oligosilsesquioxane…
▪ Abstract We discuss high-dielectric films, in general, oxide ferroelectrics based on simple perovskite structures and related Aurivillius-phase layered structure perovskites employed as thin-film capacitors in dynamic random access memories (DRAMs). Emphasis is on breakdown mechanisms and limits, leakage currents, e…