Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Atomic force microscope images show that self-assembled monolayers of octadecyltrichlorosilane form on mica by nucleating isolated, self-similar domains. With increasing coverage, the fractal dimension of the growing domains evolves from 1.6 to 1.8. At higher coverage, continued growth is limited by adsorption from so…
Dynamics of faradaic processes in polypyrrole(PPy)fims depending on the thickness of the films and on applied dc potentials have been investigated by ac electromodulation spectroscopy techniques The comparison of the capacitance plots derived from the impedance plots with the modulated transmittance (color admittanceT…
Abstract The transmittance, flexure strength, Young's modulus, and Vickers hardness of poly(methyl methacrylate) (PMMA), filled with fumed silica, was measured. Transmittance decreased with increasing content of filler. At 2 vol % filler content, composites had a higher transmittance with a lower surface area of fumed…
Abstract The effect of the solvent 1‐methyl‐2‐pyrrolidinone (NMP) on the curing of polyimide resins synthesized from pyromellitic dianhydride (PMDA) and 4,4′‐oxydianiline (ODA) has been investigated. Three polyimide precursors, i.e., the polyamic acid (PAA), with controlled amount of NMP were prepared. The study was a…
One hypothesis for the origin of the nanometer-size diamonds found at the Cretaceous-Tertiary (K-T) boundary is that they are relict interstellar diamond grains carried by a postulated asteroid. The (13)C/(12)C and (15)N/(14)N ratios of the diamonds from two sites in North America, however, show that the diamonds are…
High performance lignocellulosic composites with uniform densities, durability in adverse environments, and high strength can be produced by using fiber technology, bonding agents, and fiber modification to overcome dimensional instability, biodegradability, flammability, and degradation caused by ultraviolet light, a…
Article The crystal structure of a rare earth bearing leucophanite: (Ca,RE)CaNa2Be2Si4O12(F,O)2 was published on December 1, 1992 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 202, issue 1-4).
XPS measurements are presented for poly (methyl methacrylate). The data include the valence band region and the principal core levels.
XPS measurements for poly (ethyl methacrylate). The data include the valence band region and the principal core levels.
Abstract Coaquandite, a new antimony oxy-sulphate hydrate, occurs as spheroidal knobs of silky fibres or, rarely, as tiny transparent colourless lamellar crystals on stibnite at the Pereta mine, Tuscany, Italy; it is associated with klebelsbergite, peretaite, valentinite, sulfur, gypsum, stibiconite, and senarmontite.…
The lead zirconate rich lead zirconate titanate based ceramics present high pyroelectric coefficient as well as low dielectric constant in their rhombohedral ferroelectric phase transitions, and therefore possess many desirable properties for potential applications in pyroelectric devices. The dielectric, pyroelectric…
Pseudomonas oleovorans is an adaptable, aerobic bacterium that can produce a wide range of storage polyesters (poly-β-hydroxyalkanoates, PHAs). With few exceptions, the PHAs obtained when this bacterium is grown with single organic substrates capable of polymer production are generally copolymers. With two different p…
The computer tomography(CT image of wood was analyzed to estimate the moisture content from CT number. Comparing moisture contents, densities and CT numbers, moisture distributions were nondestructively determined by CT numbers detected with the scanner. By periodically measuring CT images of the same cross section of…
Chemical vapor deposition of Cu film on SiO 2 has been studied using cyclopentadienylcoppertriethylphosphine (C 5 H 5 CuP(C 2 H 5 ) 3 ), which contains no oxygen atom itself. The deposited Cu films had complete (111) preferred orientation for deposition temperatures below 450°C. From Auger electron spectroscopy measur…
Abstract The utilization of rubber mixtures is to achieve a desired combination of properties and performance spectrum of elastomers is nowadays of a considerable technological and economical importance. The successful implementation of this concept requires the knowledge of the factors governing both the phase behavi…
Pressure-shear plate impact experiments on an elastohydrodynamio lubricant (5P4E) are interpreted by means of a full finite deformation analysis of stress wave propagation in an elastic/viscoplastic material. The elastic response is modeled as that of a neo-Hookean solid, modified to include compressibility in such a…
Model exact static and frequency-dependent polarizabilities, static second hyperpolarizabilities and THG coefficents of cumulenes and polyenynes, calculated within the correlated Pariser-Parr-Pople (PPP) model defined over the pi-framework are reported and compared with the results for the polyenes. It is found that f…
Sm2Fe17Nx(x=3), of purity 95 vol%, was obtained by nitrogenation of Sm2Fe17alloy using a mixture of NH3(0.35 atm) and H2(0,65 atm) gases. The saturation magnetization 4πI, was 15.5 kG, and the anisotropy field Hawas found to be 220 kOe. Aligned Sm2Fe17N3powders with an average grain size of 3 μm showed a (BH)maxvalue…
Abstract Photo‐oxidative degradation reactions are mainly responsible for reduced lifetime in polymers. These reactions are responsible for the decay in useful physical and chemical properties of polymers. In addition to high ultraviolet radiation doses, hostile environments have increased temperature, high humidity,…
The kinetics and mechanism of the synthesis and degradation of polyhydroxyalkanoates (PHA) in Alcaligenes eutrophus have been studied. PHA polymers were accumulated in the cells in nitrogen-free mineral media containing various carbon substrates, and the accumulated PHA polymers were subsequently degraded after the ca…