Pitting of Sputtered Aluminum Alloy Thin Films
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Impurity effect on dendritic growth
We consider the effects of impurities on the velocity selection of a needle crystal, in the small thermal and solutal Peclet numbers. As in the case of the growth in a pure melt, steady solutions for needle crystals are found only if surface tension is anisotropic. When anisotropy is small, the variation of ${\ensurem…
The High Temperature Corrosion of Metals in Sulfidizing-Oxidizing Environments: A Critical Review
Article The High Temperature Corrosion of Metals in Sulfidizing-Oxidizing Environments: A Critical Review was published on April 1, 1989 in the journal High Temperature Materials and Processes (volume 8, issue 3).
Hepatic metastases: liposomal Gd-DTPA-enhanced MR imaging.
Liposomal gadolinium diethylenetriaminepentaacetic acid (DTPA) encapsulated within 70- and 400-nm vesicles was tested as a contrast agent for magnetic resonance (MR) imaging of the liver in rats with hepatic metastases. Liposomal Gd-DTPA caused significant improvement in contrast between liver and tumor (P less than .…
Accurate thin film multijunction thermal converter on a silicon chip (AC-DC standard)
The design of a planar, thin-film, multijunction thermal converter (MJTC) on a silicon chip containing a window with a SiO/sub 2/ membrane for low heat conductance underneath the thermal element is described. This design offers the possibility of mass production of MJTCs. Typical relative AC-DC transfer uncertainties…
Photoelectrochemistry of Nickel Hydroxide Thin Films
The photoelectrochemical behavior of electrochromic nickel hydroxide films in 1 M KOH is reported. Cathodic photocurrent was obtained from reduced films which behave as p‐type semiconductors. The effective bandgap of the reduced phase is estimated to be 3.6–3.9 eV, although optical absorbance and photoaction data indi…
Applications requirements for nonlinear-optical devices and the status of organic materials
The materials requirements for nonlinear-optical applications, including electro-optics, second-harmonic generation, and all-optical signal processing, are discussed. The status of organic materials is reviewed in light of these requirements, along with the needs for future research.
Liquid crystalline polymers containing heterocycloalkanediyl groups as mesogens. 7. Molecular weight and composition effects on the phase transitions of poly(methylsiloxane)s and poly(methylsiloxane-co-dimethylsiloxane)s containing 2-[4-(2(S)-methyl-1-butoxy)phenyl]-5-(11-undecanyl)-1,3,2-dioxaborinane side groups
Synthese des homo- et copolymeres par voie cationique. Mise en evidence de deux transitions vitreuses dans les copolymeres
The Current‐Time Relationship during Anodic Oxide Film Growth under High Electric Field
An interpretation of current‐time transients describing anodic oxide film growth on metals is presented. When the rate of oxide film growth is controlled by ion conduction under high electric field, the classical theory of Cabrera and Mott leads to shallow curvature in plots of vs. . Such data can be linearized by usi…
Polyoxoanions derived from tungstosilicate, A-.beta.-SiW9O3410-: synthesis and crystallographic and tungsten-183 NMR characterization of Si2W18Zr3O71H311-, including its organic solvent soluble Bu4N+ salt
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxoanions derived from tungstosilicate, A-.beta.-SiW9O3410-: synthesis and crystallographic and tungsten-183 NMR characterization of Si2W18Zr3O71H311-, including its organic solvent soluble Bu4N+ saltRichard G. Finke, Brian Rapko, and T. J. R. WeakleyCite this: Inorg. Ch…
Pitting of Stainless Steels by Thiosulfate Ions
Localized corrosion of stainless steels (SSs) has often occurred in newsprint paper machines, despite the low chloride concentration in the process water. This is now known to be caused by thiosulfateions, which can cause pitting of AISI 304 steel without assistance from chloride if the sulfate-to-thiosulfate ratio is…
Humidity‐Sensitive Characteristics of La3+‐Doped and Undoped SrSnO3
The humidity‐sensitive characteristics of La 3+ ‐doped and undoped specimens were investigated at 400°C as a function of water vapor pressures. The conductivities of the specimens increased about one order of magnitude over the entire water vapor pressure range by the partial substitution of La 3+ ions for Sr 2+ in ,…
Photomodulation of polypeptide conformation by sunlight in spiropyran-containing poly(L-glutamic acid)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotomodulation of polypeptide conformation by sunlight in spiropyran-containing poly(L-glutamic acid)F. Ciardelli, D. Fabbri, O. Pieroni, and A. FissiCite this: J. Am. Chem. Soc. 1989, 111, 9, 3470–3472Publication Date (Print):April 1, 1989Publication History Published onli…
Preparation and surface characterization of PEO-grafted and heparin-immobilized polyurethanes
Surfaces of commercial polyurethanes (PUs) were modified by poly(ethylene oxide) (PEO) grafting and/or heparin immobilization for long-term biomedical applications. PU surfaces were treated with diisocyanate and then reacted with PEO or heparin. The heparin immobilized by various methods on the PU surface was very sta…
Stereoregularity in synthetic β-hydroxybutyrate and β-hydroxyvalerate homopolyesters
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereoregularity in synthetic β-hydroxybutyrate and β-hydroxyvalerate homopolyestersSteven Bloembergen, David A. Holden, Terry L. Bluhm, Gordon K. Hamer, and Robert H. MarchessaultCite this: Macromolecules 1989, 22, 4, 1656–1663Publication Date (Print):April 1, 1989Publicati…
Liposomal Gd-DTPA: preparation and characterization of relaxivity.
Gadolinium diethylenetriaminepentaacetic acid (DTPA) has not proved particularly useful for hepatosplenic magnetic resonance imaging. However, by entrapping the Gd-DTPA within lipid vesicles, one may exploit the ability of the reticuloendothelial system to endocytose particulates, permitting passive delivery of contra…
Functionalized Conducting Polymers—Towards Intelligent Materials
Abstract Organic conjugated polymers and oligomers constitute a three‐dimensional network of molecular wires, in which all monomeric units can be functionalized with various prosthetic groups. By varying the nature of these groups, specific interactions with external physical or chemical phenomena can be developed in…
Use of Wood Flour as Filler in Polypropylene: Studies on Mechanical Properties
Mechanical properties of polypropylene (PP) filled with wood flour was studied. To improve adhesion at the interface, different surface treatments of the fiber were carried out. Polymethylene polyphenylisocyanate (PMPPIC) and silane coupling agents (silane A-172, A-174, and A-1100) were used to pretreat the fiber befo…
Regioselective oxidation catalysis in synthetic phospholipid vesicles. Membrane-spanning steroidal metalloporphyrins
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRegioselective oxidation catalysis in synthetic phospholipid vesicles. Membrane-spanning steroidal metalloporphyrinsJohn T. Groves and Ronny NeumannCite this: J. Am. Chem. Soc. 1989, 111, 8, 2900–2909Publication Date (Print):April 1, 1989Publication History Published online1…
A study of the linear viscoelastic properties of cyclic polystyrenes using creep and recovery measurements
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA study of the linear viscoelastic properties of cyclic polystyrenes using creep and recovery measurementsG. B. McKenna, B. J. Hostetter, N. Hadjichristidis, L. J. Fetters, and D. J. PlazekCite this: Macromolecules 1989, 22, 4, 1834–1852Publication Date (Print):April 1, 1989…