Materials Literature
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Abstract The photo and thermal oxidation of various epoxide–amine tridimensional polycondensates is studied by IR spectrophotometry and DSC. The network degradation results in a decrease of the glass transition temperature ( T g ), which is correlated with the quantity of amide groups formed. For each system, the rela…
Abstract Plasma polymerization of tetra fluoroethylene (TFE), perfluoro‐2‐butyl‐tetrahydrofuran (PFBTHF), ethylene, and styrene were investigated in various combinations of monomer flow rates and discharge wattages for the substrate temperature range of −50 to 80°C. The polymer deposition rates can be generally expres…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymerized-depolymerized vesicles. Reversible thiol-disulfide-based phosphatidylcholine membranesN. K. P. Samuel, Maninder Singh, Kazuo Yamaguchi, and Steven L. RegenCite this: J. Am. Chem. Soc. 1985, 107, 1, 42–47Publication Date (Print):January 1, 1985Publication History…
It is shown that the multi-peaked cyclic voltammograms for silicon phthalocyanine monomer-oligomer sets may be predicted from initial state molecular orbital energy levels if field shifts are used to allow for the charges of the anions and cations. The theory should have broad application for the understanding of the…
The paper first reviews briefly the various kinds of information that can be obtained from x-ray diffraction studies. Next, specific examples are given from the literature of determinations of each of the different kinds of data.
When related to a phase-change problem, an implicit finite-difference discretization of the enthalpy formulation results in a system of non-linear equations at each time step. In this paper, various numerical enthalpy methods based on such discretizations are outlined and examined. An alternative discretization for an…
The Metropolis algorithm has been generalized to allow for the variation of shape and size of the MC cell. A calculation using different potentials illustrates how the generalized method can be used for the study of crystal structure transformations. A restricted MC integration in the nine dimensional space of the cel…
Although benzotriazole and tolyltriazole are well known as extremely effective inhibitors of copper corrosion, very little has been reported in the literature regarding their chemistry, particularly in near neutral, low conductivity aqueous media. The behavior of these inhibitors was studied under typical cooling wate…
Progress of Theoretical Physics Vol. 76 No. 4 (1986) pp. 865-878 ΛN Exchange-Force Effects on the Binding Energies of 5ΛHe, 9ΛBe, 6ΛΛHe and 10ΛΛBe Hypernuclei Wang Xi-cang, Hideo Takaki and Hiroharu Bandō Progress of Theoretical Physics Vol. 78 No. 6 (1987) pp. 1317-1329 Structure of 20ΛNe Hypernucleus Toshimi Sakuda…
A series of polytungstate anions [XW12O40]n–(X = P, Si, Fe, Co, or H2; n= 3,4,5,6, and 6 respectively), spanning a range of reduction potentials, have been studied as sensitizers for the photoreduction of water and O2. [SiW12O40]4– was the most efficient sensitizer for H2 evolution in the presence of colloidal platinu…
Water sorption values for direct filling resins and an unfilled resin were much more similar at 30 days when expressed as mg/g organic matrix than as mg/cm2 or weight percent. This interpretation is indicative of the water sorption characteristics of resin matrices. The values are even more indicative when solubility…
DTA-TG study on several aragonites was carried out to clarify the transformation of aragonite to calcite through heating process. Aragonite formed in biological system started and completed the transformation at temperatures lower than did aragonite formed in inorganic systems. The DTA-TG study showed that weight loss…
Ti–Ni specimens of the equiatomic composition have been processed by conventional powder metallurgy techniques. The effects of compaction pressure, sintering temperature, and powder particle size on dimensional changes of sintered compacts are reported. During sintering, anisotropy of dimensional change occurs, with e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotocatalytic generation of hydrogen by 1:12 heteropolytungstates with concomitant oxidation of organic compoundsA. Ioannidis and E. PapaconstantinouCite this: Inorg. Chem. 1985, 24, 3, 439–441Publication Date (Print):January 1, 1985Publication History Published online1 May…
Abstract
The crystal structures of cellulose polymorphs IV I and IV II have been determined by X-ray fiber diffraction analysis combined with stereochemical model refinement. Both structures crystallize in a two-chain unit cell of essentially identical parameters. The most probable space group in both cases is P1. The chain co…
The low resistivity of copper salts of TCNQ and the associated broad e.s.r. signals suggest that the characteristic narrow-band structure of the TCNQ columns may be modified by electronic coupling to metal d bands. Crystalline AgTCNQ and CuTCNQ have been synthesised electrochemically. The crystal structure of AgTCNQ r…
The use of indentation testing as a method for investigating the deformation and fracture properties of intrinsically brittle materials, glasses, and ceramics is examined. It is argued that the traditional plasticity models of hardness phenomena can be deficient in some important respects, notably in the underlying as…
The general problem of targeted drug transport is critically reviewed and three principle components of targeted systems are discussed: the target, the vector molecule, and the carrier. Different systems of drug targeting are briefly described: local drug application, chemical modification of the drug molecule, physic…
Crystals, free from twinning, of the monoclinic phase of tricalcium silicate exhibiting superstructure reflections have been obtained. Crystal data are: a = 33.083(8), b = 7.027(2), c = 18.499(4) Å, β = 94.12(2)°, Z = 36 × Ca 2.89 Mg 0.11 OSiO 4 , V = 4289 Å 3 . The structure analysis was carried out using 3886 indepe…