Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTInteractions in Miscible Blends of Poly(styrene-co-methacrylic acid) with Copolymers Containing Vinylpyrrolidone and Vinylpyridine GroupsHeidi R. Motzer, Paul C. Painter, and Michael M. ColemanView Author Information Department of Materials Science and Engineering, Pennsylvania…
The oxidation of SiC-fiber-reinforced SiC composites at high temperature (1200°C) and elevated total water vapor pressures (up to 1.5 atm) was studied. Substantial degradation of SiC composites was observed under these exposure conditions, particularly when BN (used as a fiber coating) was a composite constituent. Bes…
ADVERTISEMENT RETURN TO ISSUEPREVNoteSynthesis of Amphiphilic Poly(ε-caprolactone) Macromonomers by Lipase CatalysisArmando CórdovaView Author Information STFI, Swedish Pulp and Paper Research Institute, P.O. Box 5604, SE−114 86 Stockholm, Sweden Cite this: Biomacromolecules 2001, 2, 4, 1347–1351Publication Date (Web)…
This study aims to precise and to quantify the link between the development of the metal/oxide roughness, the localization of cracks in the oxide layer, and the transition in Zircaloy-4 and Zr-1Nb-O corrosion kinetics. The morphological characteristics of oxide scales formed in autoclave and thermobalance at 415°C wer…
We demonstrate a use of self-assembled monolayer (SAM) as a template to deposit in-situ Si nanoparticles fabricated by laser ablation. Scanning tunneling microscopy, atomic force microscopy observations, and photoluminescence measurements show that the Si nanoparticles deposited in situ on SAMs are round shaped, firml…
A number of new aryl phosphorus-containing polymers were found to be miscible with the commercially significant bisphenol A-based poly(hydroxy ether)s (PHE) over the entire composition range by differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) measurements of the blends. Both the FTIR and C…
The alkali-doped electrosodalites form a unique class of magnetic materials where the magnetism comes from nonatom centered unpaired F-center electrons found inside body-centered cubic arrangements of alkali ion clusters supported by sodalite host lattices. In the present work the crystal structure of potassium-electr…
The layered silicic acid H-magadiite and the corresponding Na + salt have been investigated by a combination of three spectroscopies: 29 Si nuclear magnetic resonance, infrared absorption, and Raman scattering. When sodium ions are exchanged with protons, the resulting H-magadiite does not swell any more and displays…
Hydrophobically surface-modified membranes were prepared by adding a fluorine-containing graft copolymer into a microphase-separated membrane consisting of poly(dimethylsiloxane) (PDMS) and poly(methyl methacrylate) (PMMA). This study focuses on the effects of surface characteristics and microphase separation of the s…
The condensation of sodium 2,6-diformyl-4-X-phenolate (X = Cl, CH3) with the reduced 1 ∶ 1 Schiff base of 2,2′,2″-tris(aminoethyl)amine (tren) and 2-formylfuran (or benzaldehyde) followed by in situ transmetallation with copper(II) perchlorate results in the production of four novel tetranuclear copper(II) complexes o…
Adsorption of collagen on polystyrene (PS) and plasma-oxidized PS (PSox) was investigated using atomic force microscopy (AFM) as the main tool. The extent of alteration produced by the AFM tip upon scanning at controlled loading forces in water was used to obtain semiquantitative information on the properties of the i…
With XRD, FTIR, CHN, ICP, and DTA/TGA techniques, ionic interactions in the forms of cation replacement/incorporation in basal layers and anion exchange/insertion in the interlayer space have been investigated. The crystallite size is increased significantly, whereas basal spacing is reduced when Co 2+ cations or both…
In alumina and especially chromia forming alloys containing RE's in form of oxide dispersions the size and distribution of the RE is of equal importance for obtaining optimum oxidation properties as the actual type (Y 2 O 3 , La 2 O 3 , CeO 2 ) and/or exact amount (0.1-1 wt.-%) of the dispersion. In conventional cast…
The oxidation of high purity polycrystalline nickel was studied at 700 °C under flowing oxygen. For 1 μm thick oxide scale, the microstructure is cellular. For 3 to 30 μm thick oxide scales, rounded oxide platelets are observed on the scale surface. There is a large effect of substrate orientation. The scale is duplex…
The crystal structure of a new high-temperature phase of nitric acid dihydrate, HNO(3).2H(2)O, has been determined at 225 K by single-crystal X-ray diffraction. The H atom of the nitric acid is delocalized to one water molecule, leading to an association of equimolar NO(3)(-) and H(5)O(2)(+) ionic groups. The asymmetr…
2-Diformylmethylene-1,3-diselenole was prepared and condensed with dithiolium phoshonium bromides and dithiolium phosphonates in the presence of base to give dendralene-type vinylogs of TTF bearing a 1,3-diselenole moiety. The electrochemistry of these dendrimers was studied. SEEPR measurements were also carried out.…
A supramolecular templating approach to the preparation of crystalline mesoporous metal oxides using inorganic colloidal nanoparticles as building blocks is presented. The nanoparticles are used to form a mesostructured material with a triblock copolymer surfactant as the templating agent and with a tungstate salt as…
The enthalpies of oxidation of CaMnO 3 - δ, Ca 2 MnO 4 - δ, and SrMnO 3 - δ have been determined by in situ oxidation in a high-temperature adiabatic calorimeter. CaMnO 3, Ca 2 MnO 4, and SrMnO 3 were synthesized by the EDTA precursor or the ceramic method, and partly reduced materials were prepared by topotactic redu…
Ion-pair formation between carboxylate anions on particle surfaces and tetraoctylammonium cations caused the phase transfer of well-characterized, water-soluble gold nanoparticles into an organic phase. Stepwise extraction procedures demonstrated for the first time that the initially fractionated solution included gol…
The use of polycarbonates as thermally decomposable, sacrificial materials for the formation of microchannels is presented. Polycarbonates decompose in the temperature range of 200-300 °C. Two polycarbonates, polyethylene carbonate and polypropylene carbonate, have been used to fabricate microchannels in three differe…