Materials Literature
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In order to obtain the diffusion coefficient of hydrogen in iron free from trapping by dislocations and impurities, electrochemical permeation measurements have been done using high purity iron (99.99 mass% Fe), pure iron (99.99 mass% Fe, high substitutional and low interstitial impurity contents), pure iron (99.94 ma…
The sol-gel process opens the possibility of combining inorganic and organic units on a molecular or nanosized level. The flexible chemical approach of tailoring inorganic structures as well as organic polymeric structures in combination with the new concept of incorporation of nanoscaled metal oxide particles opens t…
The mechanical alloying (MA) process was developed in the mid-1960s and has evolved to commercial status with the production of oxide dispersion strengthened INCONEL® and INCOLOY® 1 MA alloys. These Ni- and Fe-based alloys possess exceptional high temperature strength, high temperature stability, and hot corrosion res…
The number and strength of the acid centres of tungstic heteropolyacids have been determined by absorption calorimetry of ammonia. The initial heats are in the order H3PW12O40>H4SiW12O40>H6P2W21O71(H2O)3>H6P2W18O62, varying from 200 to 155kJ mol–1. An increase in the number of protons in Keggin heteropolyanions decrea…
In-reactor and long-term autoclave corrosion data have been obtained on ZIRLO and three variants of Zircaloy-4: conventional (1.5% tin), low-tin, and beta-treated. In-reactor data from demonstration assemblies irradiated in the Virginia Power Company's North Anna Unit 1 reactor demonstrate the superiority of ZIRLO and…
Open lamellar systems such as layered double hydroxides (LDHs) can be used to generate new intercalation compounds. We report the synthesis of nanocomposite materials consisting of organopolymer molecules encapsulated between ultra-thin mixed-metal hydroxide sheets which are propped apart by spacers [terephthalate or…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of hard-segment flexibility on phase separation of segmented polyurethanesYingjie Li, Wanxuan Kang, James O. Stoffer, and Benjamin ChuCite this: Macromolecules 1994, 27, 2, 612–614Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Pu…
We have measured simultaneously both the normal forces F⊥(D) and the shear forces F∥(D) that act between compressed polymer-bearing mica surfaces, a distance D apart, as they slide past each other. We find that for surface-attached polystyrene (PS) brushes in the good solvent toluene the shear forces are extremely wea…
We have determined the segregation of diblock copolymers of deuterated polystyrene (dPS) and poly(2-vinylpyridine) (PVP) to a planar interface between the homopolymers using forward recoil spectrometry. The segregation isotherms, namely the interfacial excess versus its volume fraction in the homopolymer phase far fro…
Raman spectra have been obtained from a series of Pt/Al2O3 catalysts containing from 0 to 20% CeO2, and a Pt/CeO2 catalyst, prepared by sol–gel processing. Spectra were recorded following calcination of the catalyst precursors at various temperatures up to 600 °C and compared with thermogravimetric data. The results c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGrafted polymer brushes: a constant surface pressure molecular dynamics simulationGary S. GrestCite this: Macromolecules 1994, 27, 2, 418–426Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue 1 January 1994https://pubs.acs…
The chemical sol-gel route is used to prepare undoped and substituted barium and strontium ferrites. Beside standard crystallographic and magnetic measurements, ferromagnetic resonance experiments are used to analyze the formation of the hexaferrite phase and to determine the anisotropy field strength. Specific satura…
Although vibronic Jahn-Teller interactions almost always cause both 4- and 6-coordinate copper(II) complexes to distort significantly away from regular tetrahedral and octahedral geometries, rather different factors influence the size and nature of the distortions. In the former case, the active mode is a bending vibr…
The synthesis of layered lithium aluminium hydrotalcite-like materials is described along with different anion exchange procedures for the preparation of materials intercalated with chloride, nitrate and vanadate. The products have been characterised using elemental chemical analysis, powder X-ray diffraction, Fourier…
Three spiro[indoline-naphthoxazines] and a spiro[indoline-phenanthroxazine], which exhibit photochromic and thermochromic properties, have been investigated. Solvent and structure effects on the absorption spectra of the merocyanines produced under UV irradiation and kinetic parameters for the ring-closure and ring-op…
Metallic materials are used extensively as orthopedic implants, dental materials, sensing elements of bioelectrodes, and other applications. The electrochemical behavior of these biomaterials is of interest for a variety of reasons. The corrosion resistance of an implant material influences its functional performance…
B-site disordered Pb(Sc½Ta½)O3 and Pb(Sc½Nb½)O3 can be prepared in a controlled manner to show (a) relaxor behavior and (b) relaxor that undergoes a first order ferroelectric phase transition at zero-bias field. The latter case is a first demonstration of a spontaneous transformation from relaxor to ferroelectric stat…
▪ Abstract The phase-field method has recently emerged as a powerful computational approach to modeling and predicting mesoscale morphological and microstructure evolution in materials. It describes a microstructure using a set of conserved and ...Read More
Thethermoelectric properties of mixed oxides In2O3·MOx(MOx= Cr2O3, Mn2O3, NiO, ZnO, Y2O3, Nb2O5 SnO2) are investigated in terms of the thermoelectric materials at high temperature. The Seebeck coefficients,S, of all the samples have negative values, and those of In2O3·SnO2 and In2O3·ZnO increase linearly with temperat…
The syntheses and characterization of a series of (15-crown-5)methyl 3,4,5-tris(p-alkyloxybenzyloxy)benzoatest with alkyl tails of four 25, six 26, and twelve 27 carbon atoms and of (15-crown-5)methyl 3,4,5-tris(p-dodecyloxybenzoate)28 are described. Complexation of the crown ether endo-receptor with NaCF3SO3 destabil…