Materials Literature
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Abstract The results of thermal annealing at 800 and 900 °C of porous silicon samples in N 2 ambient conditions are discussed as a function of annealing time, annealing procedure, and sample preparation. The results show that N 2 annealing plays an important role in surface passivation and nanostructure feature size s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChain Cluster Polymerization and Alkali Metal Intercalation into Niobium DitellurideR. Guzman, J. Morales, and J. L. TiradoCite this: Inorg. Chem. 1994, 33, 14, 3164–3168Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Published inissue 1 Ju…
The flow behaviour of single-crystal L12 Al6 7Cr8Ti25 was measured as a function of orientation and temperature between 77 and 1250 K. These results were then correlated with an analysis of the operating slip systems using the two-surface slip trace technique, stabilities and energies of various stacking faults based…
Abstract The combined use of temperature programmed desorption (TPD) of nitrogened bases (ammonia, pyridine) and x‐ray photoelectron spectroscopy (XPS) was applied to the study of acidity of HY zeolites with different molar Si/Al ratios (∼ 2.7, 5.8, 24). N 1s binding energies of probe molecules showed two types of sit…
The increase of pretilt angle of liquid crystal in an active matrix (AM) liquid crystal display (LCD) is one of the most important issues to achieve high-contrast and defect-free AM LCDs. We have developed a new generation method of the pretilt angle by using newly synthesized organic-solvent-soluble polyimides contai…
Pentaglycerine (PG) and tris‐hydroxy‐aminomethane (Tris) are potential thermal energy storage materials which undergo energetic solid‐state phase transformations. The low temperature α‐phase structure of PG is body‐centered tetragonal and that of Tris is orthorhombic. The high‐temperature phase structure of both compo…
Dynamic compressive damage evolution in solids, associated with brittle microcracking and ductile plastic flow, is modeled through plastic flow and tensile microcracking, which are induced by the deformation of preexisting microflaws at grain boundaries, slip bands, and microcavities. The micromechanical aspect of thi…
The tetragonal-orthorhombic improper ferroelastic phase transition and domain formation of the order-disorder KSCN model is studied by molecular-dynamics simulation. A two-dimensional model of either 105\ifmmode\times\else\texttimes\fi{}105 or 49\ifmmode\times\else\texttimes\fi{}49 unit cells represents a layer of thi…
Many potential anticaries agents other than fluoride have been identified in a range of laboratory models. This review covers only those agents which have demonstrated significant activity in either animal caries models, in situ models, or human clinical trials, including those measuring plaque acid formation. The age…
Hydrogenated amorphous carbon or diamondlike carbon (DLC) films were formed by 400 eV methane (CH4) ion bombardment of various smooth and rough ceramics, as well as ceramics coated with a layer of Si or Ti. Adhesion was measured by a bonded-pin method. Excellent adhesion was measured for smooth SiC and Si3N4, but adhe…
Polyurethane (PU) elastomers based on p-phenylene diisocyanate (PPDI), poly(oxytetramethylene) glycol or poly(1,6 hexamethylene adipate) gly col and 1,4-butanediol were prepared at different NCO/OH ratios, and the mechanical property changes of these elastomers after heat aging at 150 °C were examined in the presence…
Abstract UHMPE fibers can display several morphological features, including skin‐core, microfibrillar and shish‐kebab structures. In this work, an attempt was made to eliminate these morphologies by treating the UHMPE in a two‐roll mill, at temperatures ranging from ambient to 145°C. Up to 130°C the tensile strength a…
Aromatic phosphites drive two kinds of condensation reactions: amidation and esterification. The amideforming reactions are far more efficient, lending themselves to polymerization as well as chain extension. The ester-forming reactions are significantly more sluggish, limiting their usefulness to the extension, graft…
Uniform submicrometer particles of calcium titanium peroxo‐hydroxide were prepared by adding calcium salts to the solution of peroxotitaniun. species chelated with nitrilotriacetic acid (NTA). Similarly, corresponding leadniobium compodnd of [Pb]/[Nb] = 0.75 was obtained by introducing lead salts into the solution of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpreading of a Drop between a Solid and a Viscous PolymerF. Brochard-Wyart and P. G. de GennesCite this: Langmuir 1994, 10, 7, 2440–2443Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Published inissue 1 July 1994https://pubs.acs.org/doi/10…
"Plain" and a "fancy" yarns were produced using a range of spinning speeds on a hollow spindle machine. The yarns were assessed for different characteristics using both subjective and objective tests, and the results obtained with the different techniques show good agreement. Clearly, there is a progressive change in…
Abstract Electrochemical investigations (polarization curves, polarization resistance measurements), together with weight loss measurements and quantitative chemical analysis of the solutions after immersion of samples were used to evaluate the corrosion behaviour of type 304L and 316L sintered austenitic stainless st…
Vector impedance measurements of radial modes of thin disks (diameter 13 mm and thickness 1 mm) of Pb(Zr0.515Ti0.485)O3 doped with Cr2O3 have been carried out using an impedance analyzer. Piezoelectric equivalent circuit parameters R, L, Ca in series, and Cb in parallel have been measured by simulating ‖Z‖ and θ plots…
Two populations of aggregates are generally indentified in supersaturated solutions of biological macromolecules: small aggregates of a size which is less than 5 nm and large aggregates, the largest of which are at least one order of magnitude bigger. In order to understand the role played by the microporous network o…
The fatigue behavior of a silicon carbide fiber reinforced glass ceramic matrix composite, SiC/CAS subjected to tension-compression cycling was investigated. Two laminate layups were studied: cross-ply, [0/90] 25 and unidirectional, [0] 16 . At first, the fatigue limit based on one million cycles was established for a…