Materials Literature
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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…
Continuous fiber ceramic composites (CFCCs) based on oxides are of interest for high‐temperature applications owing to their inherent oxidative stability. An enabling element is a matrix with an optimum combination of toughness and strength, which may be achieved by incorporating a controlled amount of fine, well‐dist…
Structural changes in a series of 30% hole-doped $A{\mathrm{MnO}}_{3}$ perovskites have been studied by powder neutron diffraction. Large local changes, consistent with the freezing of Jahn-Teller distortions of the ${\mathrm{MnO}}_{6}$ octahedra, occur at the metal-insulator transition at ${T}_{m}=363$ K in ${(\mathr…
Abstract Theories of fiber packing, of use in manufacturing composite materials, are developed. The maximum packing fraction of force free fibers is estimated based on a statistical analysis of the distribution of fiber‐fiber contact points. The new expressions are more general than previous ones by allowing for a dis…
The binding energies of the calibration peaks for x-ray photoelectron spectroscopy—Cu 2p3/2, Ag 3d5/2 and Au 4f7/2—have been reassessed based on the traceable data recorded in 1984 using unmonochromated x-rays and an analyser resolution of 0.3 eV. The changes in those energies, for different x-ray sources and analyser…
▪ Abstract Jahn-Teller phenomena encountered in oxides are reviewed briefly. High-spin Mn(III) in an octahedral site illustrates an ion with twofold orbitally degenerate σ-bonding orbitals having a quenched orbital angular momentum; octahedral V(III) and high-spin Co(II), as well as tetrahedral high-spin Ni(II), are e…
Abstract The concept of nanoscale reinforcement provides opportunity for synthesis of new polymer materials with unique properties. Montmorilonite (MMT) was derived from bentonite, purified, activated by sodium ions and mixed with reacting unsaturated polyester (UP). X‐ray and transmission electron microscopy data wer…
Small angle neutron scattering, SANS, was used to characterize the enhanced ordering induced by magnetic and shear alignment of chiral nematic liquid crystals of cellulose microfibrils in aqueous suspension. In a ∼2 T magnetic field the chiral nematic phase exhibits a uniform orientation over an entire 10 mL sample. S…
The self-assembly of amphiphilic dendrimers based on poly(propylene imine) dendrimers of five different generations with up to 64 end groups modified with long hydrophobic chains has been studied. At the air−water interface stable monolayers form in which the dendritic surfactants presumably adopt a cylindrical shape;…
A solvent-coordinating molecular template mechanism to synthesize one-dimensional nanostructure CdS was speculated in the equation below. The solvent molecule ethylenediamine plays an important role in controlling nucleation and growth of the CdS nanorod. As a bidentate ligand, the ethylenediamine molecule may react w…