Materials Literature
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Mullite is promising as a protective coating for silicon‐based ceramics in aggressive high‐temperature environments. Conventionally plasma‐sprayed mullite on SiC tends to crack and debond on thermal cycling. It is shown that this behavior is due to the presence of amorphous mullite in the conventionally sprayed mullit…
General methods are described for the preparation of discrete polyhedral oligomeric silsesquioxane (POSS) macromers and for their incorporation into linear polymeric systems. Depending on the type of functionality contained on the POSS macromer, macromolecular systems can be constructed with POSS units as either main…
Now in its second printing (first was Aug. DEGREES89), this book provides a starting point from which more detailed analysis of the literature may be initiated to fully evaluate the performance of metals in corrosive environments. It is an aid in eliminating alloys that are obviously inappropriate.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilica Gel Nanotubes Obtained by the Sol-Gel MethodHidenori Nakamura and Yasushi MatsuiCite this: J. Am. Chem. Soc. 1995, 117, 9, 2651–2652Publication Date (Print):March 1, 1995Publication History Published online1 May 2002Published inissue 1 March 1995https://pubs.acs.org/d…
Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and…
The influence of sulfate‐reducing bacteria on corrosion of mild steel is reviewed, with special emphasis on the effects of biofilm structure and function, medium composition (dissolved oxygen and ferrous ion concentrations) and the physical and chemical properties of iron sulfides. A summary of different corrosion mec…
We present a new formulation of Maker fringes in parallel-surface films, using self-consistent boundary conditions for reflections and allowing for any degree of refractive-index dispersion. This treatment of the second-harmonic reflections and dispersion, unlike a number of previous derivations, leads correctly to th…
Abstract Microllular plastics are cellular polymers characterized by cell densities greater than 10 9 cells/cm 3 and cells smaller than 10 μm. One of the critical steps in the continuous production of microcellular plastics is the promotion of high cell nucleation rates in a flowing polymer matrix. These high nucleati…
We have studied resistivity, magnetization, and magnetoresistance in polycrystalline ${\mathrm{La}}_{0.67}$${\mathrm{Ba}}_{0.33}$${\mathrm{MnO}}_{\mathit{z}}$ by reducing the oxygen stoichiometry from z=2.99 to 2.80. As the oxygen content decreases, the resistivity of ${\mathrm{La}}_{0.67}$${\mathrm{Ba}}_{0.33}$ ${\ma…
Gram‐quantities of pure carbon nanotubes (see Figure) can be produced using a new method reported here. The nanotubes, which can be thought of as cylindrical graphitic microcrystals, are opened and purified by treating them with a mixtue of sulfuric acid and potassium permanganate. The opening of the nanotubes on a la…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCamphorsulfonic Acid Fully Doped Polyaniline Emeraldine Salt: Conformations in Different Solvents Studied by an Ultraviolet/Visible/Near-Infrared Spectroscopic MethodYounan Xia, Joanna M. Wiesinger, Alan G. MacDiarmid, and Arthur J. EpsteinCite this: Chem. Mater. 1995, 7, 3,…
Phenomenologically, a primary dopant for a conducting polymer is a substance, a relatively small quantity of which drastically changes the electronic, optical, magnetic, and/or structural properties of the polymer and it is accompanied by a large increase in conductivity. De-doping results in a reversal of the newly-i…
Most previous theoretical investigations of gas bubble dynamics have assumed an uncontaminated gas–liquid interface. Recently, however, the potential importance of layers of surface active agents on bubble dynamics has been increasingly recognized. In this work it is assumed that a continuous layer of incompressible,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign and Synthesis of Macrocyclic Ligands and Their Complexes of Lanthanides and ActinidesV. AlexanderCite this: Chem. Rev. 1995, 95, 2, 273–342Publication Date (Print):March 1, 1995Publication History Published online1 May 2002Published inissue 1 March 1995https://pubs.ac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotofunctions of Intercalation CompoundsMakoto Ogawa and Kazuyuki KurodaCite this: Chem. Rev. 1995, 95, 2, 399–438Publication Date (Print):March 1, 1995Publication History Published online1 May 2002Published inissue 1 March 1995https://pubs.acs.org/doi/10.1021/cr00034a005ht…
Abstract The double cubic lattice method (DCLM) is an accurate and rapid approach for computing numerically molecular surface areas (such as the solvent accessible or van der Waals surface) and the volume and compactness of molecular assemblies and for generating dot surfaces. The algorithm has no special memory requi…
Abstract The molecular weight of polyester polyol plays an important role in controlling mechanical and dynamic mechanical properties of polyurethanes. Two systems are studied for evaluation of these properties. Since the properties of polyurethanes are derived from the properties of various constituents involved in t…
Abstract In‐line monitoring of monomer conversion is studied using a low‐frequency dielectric sensor during solution polymerization of methyl methacrylate in a laboratory‐scale batch reactor. It has been found that the induction period due to the presence of an inhibitor can be determined by the dielectric sensor to d…
Abstract Fracture behavior of polypropylene (PP)/ethylene–propylene–rubber (EPR) blends containing small crystal in elastomeric phase was investigated. Various ethylene‐α‐olefin co‐polymers (ECP) were used as crystal components and put into the elastomer phase of the blends. The crystallite size was controlled by chan…
Abstract A calorimetric study for estimating crosslinking densities of polydimethylsiloxane (PDMS) networks is presented. It involves the experimental determination of the heat capacities of the polymer with ( C ) and without ( C ) crosslinking. The theoretical basis of the method is described as well as the procedure…