Materials Literature
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We use a rigorous formalism for lossy lamellar gratings to establish the validity of the quasistatic approximation for this structure in the limit as its period d becomes much finer than the wavelength u of incident light. In the quasistatic limit, the grating behaves like a uniaxial film in its interaction light, its…
Abstract The chemistry and energetics of the Criegee intermediate, a primary product of the ozonolysis of alkenes, are discussed in terms of recent ab ‐ initio calculations and laboratory studies. The experimental observations in O 3 –alkene systems can be rationalized on the basis of a general mechanism: magnified im…
The magnetic properties of amorphous ${\mathrm{Mg}}_{1\ensuremath{-}x}{\mathrm{Fe}}_{x}$ alloys were studied by means of magnetization measurements and the $^{57}\mathrm{Fe}$ M\"ossbauer effect. It was found that the apparent decrease with $x$ of the Fe moment derived from magnetization measurements is due to deviatio…
The setting reaction of six dental materials has been studied by using a water dilatometer at 25 degrees and 37 degrees C. Where there is no water absorption during the test, the method gives reproducible values of the setting shrinkage and at the same time shows a clear physical picture of the entire setting process.…
It is shown that copies of seven elementary cells suffice to fill any region of Euclidean three-dimensional space. The seven elementary cells have four basic convex polyhedral shapes and three of them appear in two different sizes. The space filling is non-periodic, has a central point, and preserves the full icosahed…
The formation of water from atomic oxygen and atomic hydrogen coadsorbed on the Pt(111) surface has been characterized by x-ray photoemission (XPS) and temperature programmed reaction (TPR). These studies were performed between 100 and 155 K, which is below the desorption temperature for adsorbed water on the Pt(111)…
Abstract In the grafting of acrylic acid onto polyethylene by preirradiation method, the irradiation in air gave a higher rate of grafting than in N 2 , since the diffusion rate of monomer is larger for less crosslinked polyethylene. The rate of grafting decreased with increasing time of storaging polyethylene because…
The use of liposomes has recently been the subject of considerable attention as a promising and versatile approach to drug delivery. Particularly intriguing is the possibility of targeting liposomes to specific areas of the body such as tumors or sites of inflammation or parasitic invasion for either local accumulatio…
Abstract The mineralogy, petrology and trace element geochemistry of volcanogenic glauconites and smectite-rich clays are described and related to clay assemblages in Lower and Upper Cretaceous sediments of southern England and Northern Ireland. Volcanogenic glauconite grains represent argillized lava particles of pre…
The following questions are considered: How do itinerant d electrons of the Heusler alloys produce magnetic moments that are completely localized on the Mn atoms? What is the microscopic origin of Invar anomalies? Why is elemental antiferromagnetism confined to Cr, Mn, and Fe? Why do the Fe atoms in Fe3Si carry two di…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluorescence of the diastereoisomers of 2,4-di(N-carbazolyl)pentane and the two excimers observed in poly(N-vinylcarbazole)F. C. De Schryver, J. Vandendriessche, S. Toppet, K. Demeyer, and N. BoensCite this: Macromolecules 1982, 15, 2, 406–408Publication Date (Print):March 1…
The anisotropy in the static magnetic susceptibility of bis-tetramethyltetraselenafulvalene hexafluoroarsenate [${(\mathrm{TMTSF})}_{2}$As${\mathrm{F}}_{6}$] has been investigated above and below the metal-to-insulator transition for a range of fields between 0.5 and 30 kG. The results are consistent with the expectat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic spectrum of [FeCl5(H2O)]2-Ursula Kambli and Hans U. GuedelCite this: Inorg. Chem. 1982, 21, 3, 1270–1272Publication Date (Print):March 1, 1982Publication History Published online1 May 2002Published inissue 1 March 1982https://pubs.acs.org/doi/10.1021/ic00133a081ht…
Flux-loss characteristics during long-term air aging of four rare-earth-cobalt matrix magnet types were measured. Irreversible losses and reversible temperature coefficients on heating above room temperature are reported. Purely magnetic and permanent microstructure-related changes during aging were differentiated by…
The mechanism of the low = high quartz phase transformation is discussed in terms of tilting of [SiO4] tetrahedra and formation of Dauphiné twin domains below the transformation temperature. The low-quartz domain boundaries have a finite thickness. Within the domain wall the tilt angle changes gradually from + ϕ to -ϕ…
Abstract Hardness, modulus, and tear strength of PTMEG-based polyurethanes are mainly affected by the hard-segment (MDI/BDO) concentration. On the other hand, PTMEG molecular weight mainly influences low-temperature and dynamic properties. Resilience and hydrolytic stability are affected by both soft-segment concentra…
Nylon 66, nylon 6, antistatic nylon 66, and polyester yarns of various lusters were made into commercial warp-knitted fabrics using some dyes that retarded and others that promoted photodegradation. These fabrics, together with undyed ones, were exposed under glass and by direct weather in Florida to determine the rel…
The CaO formed by complete isothermal decomposition of calcite single crystals in vacuum has surface areas that range from 127.10 m 2 g at 650°C to 60 ± 20 m 2 /g at 900°C. Surface areas are not significantly reduced by annealing at 900°C in vacuum. SEM observations and other available data show that CaO particles, wh…
The effect of the front of impulse voltages on the breakdown of nonuniform gaps in SF6 has long been reported to be unsystematic. The present study provides an explanation to this phenomenon by examining the breakdown probability distributions of rod- plane gaps in SF6 over a wide range of gas pressure and under diffe…
The influence of redox couples on the measured flatband potentials of n-CdSe was investigated. It is concluded that flatband shifts are due to interface surface state-redox electrolyte carrier exchange that leads to variable interface state charge. Interface state densities ∼2×1012 cm−2, were determined with thin anod…