Materials Literature
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▪ 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…
Transparent high lead and tin‐opacified lead‐alkali glazes have been extensively used throughout Europe and the Near East from their first appearance in the Roman era and the tenth‐ to eleventh‐century Islamic world, respectively, up until the present day. Using, to a large extent, information which is widely scattere…
Catalysis and heterogeneous catalysts are essential to our present technology for the production and consumption of fuels, the manufacture and processing of chemical feedstocks and plastics [1,2]. It had been estimated that the introduction of this technology has permitted savings of more than 400 million barrels of o…
Abstract Polymorphism of calcium carbonate was investigated using a constant‐composition method, and three polymorphs—calcite, aragonite, and vaterite—are produced. Factors that affect the formation of polymorphs are studied over a wide range, including solution pH, temperature, concentration ratio of components, supe…
The new spin-crossover compound Fe(PM-BiA)(2)(NCS)(2) with PM-BiA = N-(2-pyridylmethylene)aminobiphenyl has been synthesized. The temperature dependence of chi(M)T (chi(M) = molar magnetic susceptibility and T = temperature) has revealed an exceptionally abrupt transition between low-spin (LS) (S = 0) and high-spin (H…
Share Icon Share Twitter Facebook Reddit LinkedIn Reprints and Permissions Cite Icon Cite Search Site Citation Philip Coppens, Kersti Hermansson; X‐Ray Charge Densities and Chemical Bonding. Physics Today 1 August 1998; 51 (8): 66–68. https://doi.org/10.1063/1.882350 Download citation file: Ris (Zotero) Reference Mana…
Polyhedral octahydridosilsesquioxanes, [HSiO 1.5 ] 8 ( 1 ) and [(HSiMe 2 O)SiO 1.5 ] 8 ( 3 ) were hydrosilylatively copolymerized with stoichiometric amounts of the octavinylsilsesquioxanes, [vinylSiO 1.5 ] 8 ( 2 ) and [(vinylSiMe 2 O)SiO 1.5 ] 8 ( 4 ) in toluene using platinum divinyltetramethyldisiloxane, “Pt(dvs)”,…
Abstract This report embodies recommendations on zeolite nomenclature approved by the International Mineralogical Association Commission on New Minerals and Mineral Names. In a working definition of a zeolite mineral used for this review, interrupted tetrahedral framework structures are accepted where other zeolitic p…
We report on the physical characterization of a dioctyl-substituted polyfluorene, both in solution and in the solid state. We focus on studies of chain geometry both by molecular modeling and by gel permeation chromatography coupled with light scattering. We determine experimentally a Kuhn segment length, lk = 17.1 ±…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTElectrostatic Self-Assembly of Silica Nanoparticle−Polyelectrolyte Multilayers on Polystyrene Latex ParticlesFrank Caruso, Heinz Lichtenfeld, Michael Giersig, and Helmuth MöhwaldView Author Information Max-Planck-Institute of Colloids and Interfaces Rudower Chaussee 5,…
A fracture mechanics technique to quantitatively measure the adhesion or interfacial fracture resistance of interfaces in thin film structures is described. Adhesion values obtained for the technologically important SiO2/TiN interface in microelectronic interconnect structures are related to a range of material, mecha…
It has been about 10 years since the first intentional preparation of hyperbranched polymer was disclosed. Hyperbranched polymers, as well as dendrimers, may find utilities in the areas where the structural uniqueness of these polymers gives merit. There has been much progress in the structural understanding and the m…
An explanation is proposed of the unusual magnetoresistance, linear in magnetic field and positive, observed recently in nonstoichiometric silver chalcogenides. The idea is based on the assumption that these substances are basically gapless semiconductors with a linear energy spectrum. Most of the excess silver atoms…
The available literature on the crystal structure of the metastable alumina polymorphs and their associated transitions is critically reviewed and summarized. All the metastable alumina structures have been identified as ordered or partially ordered cation arrays on the interstitial sites of an approximately close‐pac…
▪ Abstract The term bone refers to a family of materials, all of which are built up of mineralized collagen fibrils. They have highly complex structures, described in terms of up to 7 hierarchical levels of organization. These materials have evolved to fulfill a variety of mechanical functions, for which the structure…
The program POTATO, which was developed to model distorted perovskite structures, has been used to assess the stability of hypothetical compositions and guide the synthesis of new materials at high pressures and high temperatures. The initial result of this effort is the synthesis of two new perovskites, Ca 2 NdAgTi 4…