Materials Literature
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The hydrothermal method to deposit lead zirconate titanate (PZT) thin film is a new method reported by Tsurumi et al. . in 1991. This method consists of two linked processes. We have found that the film deposited by the first process is not PZT but separated lead zirconate (PZ) and lead titanate (PT). In this paper, w…
Abstract The termination rate coefficient k t of the free radical bulk polymerization of styrene is determined between 30 and 90°C up to a maximum pressure of 2800 bar. The majority of polymerization experiments has been carried out at monomer conversions up to 20 per cent. In this range a single value of k t is suffi…
The similar diastereoselectivities as for peracids implicate a pentacoordinated metal peroxy species in the epoxidation of chiral allylic alcohols by the titanium-containing zeolites TS-1 and Ti-β. In the loaded complex, the allylic alcohol substrate is fixed through hydrogen bonding to the metal center, with A 1,3 st…
Void-size distributions have been calculated for the shifted-force Lennard-Jones fluid over substantial temperature and density ranges, both for the liquid-state configurations themselves, as well as for their inherent structures (local potential energy minima). The latter distribution is far more structured than the…
Au clusters supported on the TiO2(001)/Mo(100) surface and Pd clusters supported on the MgO(100)/Mo(100) surface have been studied using temperature programmed desorption, ion scattering spectroscopy, scanning tunneling microscopy, and scanning tunneling spectroscopy. Three dimensional growth has been observed at 300…
This paper describes chemical strategies, used in conjunction with the template method, for preparing composite micro- and nanostructures. An example is shown here. Each pore in the template membrane (A) is first filled with a tubule of Au (B). An electropolymerization method is then used to deposit a tubule of an ins…
Experimental measurements are presented of the concentration dependence of the low-shear limit viscosity of nearly monodisperse polymethylmethacrylate spheres dispersed in cis-decalin, a system that models a suspension of hard spheres. The suspension volume fractions are calibrated with reference to the volume fractio…
Synthetic methods for making an all-silica MCM-41 mesoporous silicate of high long-range order are reported. The product shows up to seven orders of X-ray diffraction and good stability under calcination conditions. The greatest improvement in structure occurs when the pH is held between 9 and 10 during synthesis and…
Abstract Several synthetic strategies have been explored to prepare dendrimers having the [Ru(bpy) 3 ] 2+ complex as their core (bpy = 2,2′‐bipyridine). Dendritic ligands have been synthesized by attaching branches in the 4,4′‐positions of bpy. The largest dendritic bipyridine ligand contains 54 peripherical methylest…
A reverse micelle based approach is reported for the synthesis of BaCO 3 nanowires with lengths up to 100 μm and diameters as small as 10−30 nm, each of which is a continuous single crystal with the c -axis along the wire length axis. The synthesis is achieved by the reaction of barium and carbonate ions solubilized i…
Abstract Polymerization of MMA is achieved by using a novel initiator, most probably the lanthanum enolate growing species formed in the polymeritation of ketene with La(O i Pr) 3 . The design of this simple initiator is based on the stimulation of the reactivity of La(O i Pr) 3 , which by itself is inactive, upon the…
Abstract Accelerated thermal degradation of nitrile‐butadiene rubber, ethylene‐propylene rubber, low density polyethylene and glass reinforced epoxy resin was studied (a) in air, at atmospheric pressure, and various temperatures and (b) in air or oxygen at various pressures ( P > 1 atm) and temperatures. On the bas…
Abstract Mono‐ and polyestolides, made from oleic acid, meadowfoam oil fatty acids and erucic acid, were subjected to biodegradation with mixed cultures of Penicillium verucosum, Mucor racemosus , and Enterobacter aerogenes . Fermentations were continued for 3, 5, 10, 15, 20, or 30 d. Meadowfoam oil and its fatty acid…
Abstract Composite samples consisting of ferromagnetic asymmetric particles incorporated into a polyolefin binder were injection molded using custom designed molds which produced preferential fiber orientations. The relative magnetic permeability values of the composites were measured as a function of the filler volum…
Thick‐film conductors, made from mixed and alloyed powders of Ag‐15Pd and Ag‐30Pd, have been explored in distilled water at a bias of 5 V to assess their resistance to electrolytic silver migration It was found that the resistance increases with the Pd concentration in the thick films ( i.e. , Ag < Ag‐15Pd < Ag‐30Pd)…
Fabric-evoked prickle is studied in a range of jersey knitted wool fabrics made from worsted spun yarn. The existing predictive model of relative prickliness based on earlier studies of wools with diameter characteristics is extended and can quantitatively account for changes in mean fiber length, yarn count, and fabr…
The reaction of hydrochloric acid with dry alkaline sorbents such as hydrated lime in the incineration units leads to the formation of not only calcium chloride but calcium hydroxichloride as well. A thermodynamic study of the chemical reactions involved in the dechlorination process is required in order to show if su…
Diatoms were examined from the skin of a male sperm whale (Physeter macrocephalus L.) stranded on the Belgian shore in 1994 on its return from the northern Atlantic to more southern latitudes. The morphology (LM and SEM) and taxonomy of the three ceticolous taxa present are discussed. Epiphalaina aleutica Holmes, Naga…
The thermal degradation behavior of E−CO alternating copolymers submitted to a variety of thermal conditions, both in a vacuum and in an inert atmosphere, has been investigated. The products obtained in the different thermal treatments were analyzed by GC/MS, and the structural changes occurring in the polymer chains…
The effects of oblique sputtering on microstructural modification of ZnO films were investigated. Surface morphologies of the films were profoundly modified with an incidence angle. By using pure Ar gas, etch pits, pyramids, ridge, and ledgelike structures were developed on the film surface. By using Ar/O2 mixture gas…