Materials Literature
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Polytitanates in the BaO‐TiO 2 system with Ba: Ti ratios ranging from 1:2 to 1:5 were prepared employing the liquid mix technique. The samples were heated at 600° to 1300°C in oxygen, and Raman spectroscopy was used to investigate the phase relations in the system. The powders of various compounds were amorphous at te…
Abstract Size of colloidal CdS particles in aqueous medium was controlled by adding thiols in the procedure of the preparation. The change in optical absorption spectra and the quantum yield of photoinduced electron transfer were measured for these size-controlled CdS colloids.
Abstract New bismaleimides containing ether bonds were prepared. The thermal properties of the bismaleimides were investigated by differential scanning calorimetry (DSC). The effects of structure of the bismaleimides and curing conditions on the thermal and mechanical properties of the cured resins such as initial dec…
In a polycrystalline material it is usual for three grains, and therefore three grain boundaries, to meet on a line, the ‘triple line’. Since grain boundaries can be interpreted as dislocation networks, a question arises about the dislocation balance at the triple line. It is shown that, if the dislocation balance is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase separation by spinodal decomposition in polycarbonate/poly(methyl methacrylate) blendsThein Kyu and Jeanne M. SaldanhaCite this: Macromolecules 1988, 21, 4, 1021–1026Publication Date (Print):April 1, 1988Publication History Published online1 May 2002Published inissue 1…
The operative and controlling mechanisms of steady‐state creep in sintered α‐SiC have been determined both from kinetic data within the ranges of temperature and constant compressive stress of 1670 to 2073 K and 138 to 414 MPa, respectively, and from the results of extensive TEM and other analytical analyses. Dislocat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDilute solution behavior of 3-arm asymmetric and regular 3- and 12-arm polystyrene starsNitya Khasat, Robert W. Pennisi, Nikos Hadjichristidis, and Lewis J. FettersCite this: Macromolecules 1988, 21, 4, 1100–1106Publication Date (Print):April 1, 1988Publication History Publi…
Thermochromism and anomalous temperature dependence of emission spectra have been observed in poly(3-alkylthiophene) films, and are explained in terms of the transition of poly(3-alkylthiophene) conformation. The spectral change by laser irradiation and its memory have also been confirmed. The application of this phen…
Abstract Blending brittle polymer particles in a ductile polymer matrix is a new way to obtain toughened plastics. Although the nylon‐6/poly(acrylonitrile‐co‐styrene) (SAN) system is a ductile/brittle combination, the blend does not result in a toughened plastic. We have investigated the effect of adding a small amoun…
The electrical conductivity and thermoelectric power of single‐crystalline Ba 0.03 Sr 0.97 TiO 3 were measured over a wide temperature (800° to 1100°C) and oxygen partial pressure (10 5 to 10 ‐15 Pa) range. Our experimental data, like those of previous workers on nominally undoped BaTiO 3 or SrTiO 3 , support a defect…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInclusion tuning of nonlinear optical materials: switching the SHG of p-nitroaniline and 2-methyl-p-nitroaniline with molecular sieve hostsS. D. Cox, T. E. Gier, G. D. Stucky, and J. BierleinCite this: J. Am. Chem. Soc. 1988, 110, 9, 2986–2987Publication Date (Print):April 2…
Abstract Based on the Gibbs cannonical distribution, a number of physical quantities is related to crystal growing conditions such as various point defect densities (intrinsic, vacancies, antistructural, complex of some point defects), high‐temperature density of free carriers, homogeneity region width, and impurity d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTImproved synthesis of covalently strapped porphyrins. Application to highly deformed porphyrin synthesisTilak P. Wijesekera, John B. Paine III, and David DolphinCite this: J. Org. Chem. 1988, 53, 7, 1345–1352Publication Date (Print):April 1, 1988Publication History Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordination chemistry, inductive metal-metal bond transfer, and magnetic susceptibility of adducts of tetrakis(trifluoroacetato)dichromiumCarl J. Bilgrien, Russell S. Drago, Charles J. O'Connor, and Ngai WongCite this: Inorg. Chem. 1988, 27, 8, 1410–1417Publication Date (Pr…
The heat capacity of crystalline iodoform prepared by vacuum sublimination has been measured from 50 to 340 K and that of iodoform prepared by recrystallization from acetone measured from 120 to 300 K. Both samples exhibit a phase transition near 260 K. The heat capacity anomaly in the sublimed material shows several…
New measurements are reported for the ionic conductivity of well-annealed crystals of pure NaCl, NaCl doped with Sr 2+ ions, and NaCl doped with S 2− ions. Analysis of these data leads to the conclusions (i) that the Schottky defect model is entirely adequate for NaCl (in contrast to KCl); and (ii) that the activation…
1‐Phenyl‐2‐propyn‐1‐ol (1‐PPO) is a very efficient corrosion inhibitor for oilfield steel in hydrochloric acid. With a suitable surfactant, 1‐PPO can impart >99% protection to API J55 steel in 15% at 65°C for 24h. Chemical analyses of the products formed on the steel surface and in solution indicate that 1‐PPO reacts…
The purpose of this investigation was to (a) begin to evaluate the coagulation curve as a means of selecting the minimal quantity of IgG required to stabilize colloidal gold (Au); (b) determine the effect of the quantity of IgG added, the pH of adsorption, and the isoelectric point (pI) range of the IgG on the quantit…
differences between observed and calculated values was already well established in crystallography. From there it was, in retrospect, only a small step to refrain from using the integrated intensities as observed values but to use the actual measured profile intensities obtained by step scanning the powder diagram. Th…
An algorithm is described for the determination of an experimental (learned) peak shape function, which has been used succesfully in crystal structure refinements from powder data. The function gives an optimal fit to almost any peak shape since it is not based on an analytical expression. It is determined from a sing…