Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDioxoporphyrins as Supramolecular Building Blocks: Oligomer Synthesis via Preassembly on a Ligand TemplateDuncan W. J. McCallien and Jeremy K. M. SandersCite this: J. Am. Chem. Soc. 1995, 117, 24, 6611–6612Publication Date (Print):June 1, 1995Publication History Published on…
Abstract The main surface treatments of materials (metals and plastics in particular) to be joined are presented. It is observed that these treatments modify the roughness, morphology, and chemical composition of the surface. As a result of these operations, the substrate surface energy is generally increased. A corre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Role of Lithium Salts in the Conductivity and Phase Morphology of a Thermoplastic PolyurethaneJ. D. Van Heumen and J. R. StevensCite this: Macromolecules 1995, 28, 12, 4268–4277Publication Date (Print):June 1, 1995Publication History Published online1 May 2002Published i…
Compacts of TiB 2 with densities approaching 100% are difficult to obtain using pressureless sintering. The addition of SiC was very effective in improving the sinterability of TiB 2 . The oxygen content of the raw TiB 2 powder used in this research was 1.5 wt%. X‐ray photoelectron spectroscopy showed that the powder…
The occurrence of anomalously high ionic-defect concentrations in solids at temperatures approaching the transition to a molten or superionic (i.e., molten cation or anion sublattice) phase is a well-known phenomenon. We show that this premelting phenomenon can be quantitatively described by a cube-root law not only f…
We report computer simulations of a three-dimensional system of semiflexible polymers consisting of hard spherocylinders connected by joints of variable flexibility. In these simulations, we have studied the influence of molecular flexibility on the location of the isotropic-nematic phase transition. A comparison of o…
A complex of polyhydroxybutyrate (PHB), Ca2+, and inorganic polyphosphate (polyP) was proposed as the membrane component responsible for competence for DNA entry in Escherichia coli (Reusch, R. N., and Sadoff, H. L. (1988) Proc. Natl. Acad. Sci. U.S.A. 85, 4176-4180). While chemical and immunological assays and 1H NMR…
In a spinal turtle, unilateral stimulation in the rostral scratch receptive field elicited rhythmic fictive rostral scratching in ipsilateral hindlimb motor neurons; contralateral hip motor activity was also rhythmic and out-of-phase with ipsilateral hip motor activity. When left and right rostral scratch receptive fi…
Sol‐gel processing of yields amorphous aerogels (ARG) and xerogels (XRG) that serve as high capacity intercalation hosts for lithium ions. The insertion process is highly reversible in both the aerogel and xerogel form, suggesting that they are attractive for rechargeable lithium batteries and other electrochemical de…
The ac impedance response of a symmetrically bathed membrane consisting of a conducting polymer is modeled. The model is an extension of a recent one proposed for a conducting polymer film contacting an electronic and an ionic conductor on its two faces (modified electrode geometry) and takes into account both diffusi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemical Properties of New Photolabile cAMP Derivatives in a Physiological Saline SolutionToshiaki Furuta, Hiromi Torigai, Masazumi Sugimoto, and Michiko IwamuraCite this: J. Org. Chem. 1995, 60, 13, 3953–3956Publication Date (Print):June 1, 1995Publication History Publ…
Abstract Methanol, in combination with a non‐ionic phosphazene base, was used to initiate the polymerization of octamethylcyclotetrasiloxane. In bulk, an instantaneous and large increase in viscosity was observed upon addition of the initiator. In toluene solution, the equilibrium state was reached in approximately 1…
A shear flexible shell theory is used to predict the drape of fabrics. The fabric is considered a continuous, orthotropic medium. Finite element formulations are used to numerically solve governing equations under specific boundary conditions. Initially, the fabric is assumed to be a flat plate, which goes through lar…
Proteins, like DNA, are subject to various forms of damage that can render them non-functional. Conformational changes and covalent chemical alterations occur spontaneously, and the rates of these reactions can be increased by environmental stresses such as heat, oxidative agents, or changes in pH or osmotic condition…
It is demonstrated that electroluminescent porous silicon (PS) diodes operate as surface-emitting cold cathodes. The PS diode is composed of a semitransparent thin Au film, PS layer, n-type Si substrate and ohmic contact. When a sufficient positive bias voltage is applied to the Au contact in vacuum, the diode uniform…
We report on the synthesis and optical characterization of hydrazone derivatives developed for second-order nonlinear optics. Electric-field-induced second harmonic generation (EFISH) as well as semiempirical quantum-chemical computations have been carried out to investigate and explain the nonlinear optical propertie…
Abstract Isotherms were obtained for nitrogen adsorption and desorption on seven halloysite-rich samples from New Zealand and Western Australia. Calculations from these isotherms indicate that halloysites with mainly small particles (< c . 0.08 μm in width) had abundant cylindrical pores with narrow size distributi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirect Observation of Three-Dimensional Bicontinuous Structure Developed via Spinodal DecompositionHiroshi Jinnai, Yukihiro Nishikawa, Tsuyoshi Koga, and Takeji HashimotoCite this: Macromolecules 1995, 28, 13, 4782–4784Publication Date (Print):June 1, 1995Publication History…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvolution of Microstructure during Shear Alignment in a Polystyrene-Polyisoprene Lamellar Diblock CopolymerV. K. Gupta, R. Krishnamoorti, J. A. Kornfield, and S. D. SmithCite this: Macromolecules 1995, 28, 13, 4464–4474Publication Date (Print):June 1, 1995Publication History…
Fractals have been used extensively to provide a description and to model mathematically many of the naturally occurring sampler shapes, such as coastlines, mountain ranges, clouds, etc., and have also received increased attention in the field of image processing, for purposes of segmentation and recognition of region…