Materials Literature
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Absorption, luminescence, and excitation luminescence studies of dye molecules adsorbed onto ultrathin, variable-thickness silver films show strong coupling of the particle plasma resonances to the molecules. Luminescence from the dye is increased by excitation transfer from the silver particles for certain film thick…
The domain structures in BaTiO3 ceramics differ from those of single crystals. The spatial configuration of the domains in the ceramics has been derived from etch patterns. All observed etch patterns can be described by two types of domain configurations. Thin layered domains separated by 90 ° walls are piled up to fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrocarbon oxidations with oxometalloporphinates. Isolation and reactions of a (porphinato)manganese(V) complexJohn T. Groves, William J. Kruper Jr., and Robert C. HaushalterCite this: J. Am. Chem. Soc. 1980, 102, 20, 6375–6377Publication Date (Print):September 1, 1980Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDomain-Boundary Structure of Styrene-Isoprene Block Copolymer Films Cast from Solution. 4. Molecular-Weight Dependence of Lamellar MicrodomainsTakeji Hashimoto, Mitsuhiro Shibayama, and Hiromichi KawaiCite this: Macromolecules 1980, 13, 5, 1237–1247Publication Date (Print):S…
ABSTRACT Differential Scanning Calorimetry (DSC) was used to study gelatinization phenomena of corn, potato, acid‐modified corn and smooth pea, and various legume starches. Two endothermic transitions were observed for starches heated in the presence of limited amounts of water (starch/water = 46–48% w/w). The effect…
Inelastic neutron scattering measurements on a single crystal of NaNO 3 have yielded the temperature behaviour of the lattice vibrations propagating along the threefold axis. Frequency, shifts and anomalous linewidths are observed near the order-disorder transition temperature (T c =276C). In general, the observed beh…
The number of scrap tires in Japan in 1977 was estimated to be approximately 47 million with a total weight of 550 thousand tons. Although some of them are reused as reclaimed rubber, recapped tires, etc., it is difficult to recycle all of the scrap tires by the usual methods, therefore, there is a demand for new recy…
The principal driving force behind composite development is the requirement for lighter weight structural materials. New design concepts using easily fabricated, fiber-reinforced composites that combine superior stiffness with a high strength-to-weight ratio are needed to replace metal structure. Presently, epoxies an…
A study of Bragg reflections in both blue phases (BPI, BPII) of two mixtures of chiral and nonchiral biphenyls indicates both phases probably have the same translational symmetry and are either body-centered or simple cubic. The temperature dependence of several Bragg reflections indicates that the BPI-BPII transition…
The octahedral lanthanide crystal field is calculated for trivalent lanthanide ions (Ln3+) in the cubic Cs2NaLnCl6 elpasolite structure. These calculations are based on a model which includes two types of Ln3+-ligand interactions: multipole(Ln3+)-point charge(ligand) and charge(Ln3+)-induced dipole(ligand). The latter…
A calculation of the energy bands of V2O5 is presented. The method avoids the limitations and assumptions inherent in the only previous calculation of the electronic structure of this material. The valence and conduction band structure appear to provide more convincing agreement with measured photoemission and optical…
Abstract The glass transition temperature (T g ) of an amorphous polymer is the temperature at which motion occurs in the major segments of the backbone molecular chain of the polymer. However, the effect of water on the T g of a hydrophobic polymer has generally not been recognized. Almost all fibers are only partial…
Pig heart citrate synthase was subjected to limited proteolytic attack by subtilisin, chymotrypsin, and trypsin in the presence of palmitoyl-CoA. Initial proteolysis by all three proteolytic enzymes resulted in cleavage of the monomeric subunit (Mr 45 000 +/- 3000) into a large (Mr 35 000-38 500) and a small (Mr 9000…
Abstract A critical pore size is defined as the largest pore that can carry 100% non-freezing water. Pores of size larger than critical pore size will have freezing and non-freezing water. The critical pore size for pulp fibers is estimated as 40 Å. Since more than 98% of the surface area may be in pores smaller than…
High-resolution x-ray scattering studies show a new charge-density wave (CDW) structure on warming through the commensurate-incommensurate transition in $2H$-Ta${\mathrm{Se}}_{2}$ at 93 K. In contrast to the fully incommensurate CDW structure seen on cooling, hexagonal symmetry is broken in the new phase and the tripl…
Polystyrene spheres (2450 \AA{} in diameter) are trapped in a surface energy well at water/air interface. Because of asymmetry of charge distribution, electrical dipoles are associated with each interfacial particle. The dipole-dipole repulsive interactions organize the polystyrene spheres into a two-dimensional trian…
The static configurations of domain boundaries are studied in the α, β, and γ phases of ferroelastic lead orthovanadate. The domain configurations can consistently be understood on the basis of strain energy minimization considerations. The boundary orientations in the β-phase are consistent with the theoretical predi…
In zero-gap ${\mathrm{Hg}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}$ Te alloys, the existence of spin-orbit coupling in the intermediate states leads to anisotropic indirect exchange interactions between localized spins. These effects are evaluated and are shown to reduce the Curie-Weiss temperature previously calculated.
A classical theory of the static strains and lattice dynamics for solids possessing incommensurate structures is developed using a spatial Fourier representation of the static strains and a space-time Fourier representation of the dynamical modes. Although the theory is presented for one-dimensional systems, the gener…
Using a refinement of a capillary technique described earlier precise PVT data on D2O between 0.1 and 140 MPa and down to −30 °C have been obtained, and the pressure dependence of the volumetric behavior in the vicinity of the well-known density maximum has been examined. The ’’sharpness’’ of the density maximum, defi…