Materials Literature
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La 0.6 Sr 0.4 MnO 3 thin films were fabricated on SrTiO3 (001) substrates using pulsed laser deposition with observing persistent intensity oscillation of reflection high-energy electron diffraction. By atomic force microscopy, the surface of resulting films was confirmed to be extremely flat, showing atomically smoot…
We present a new type of basis set which is local, compact, and orthogonal. The basis functions, called orthlets, are centered at the sites of a lattice and are specifically adapted to represent the system being studied. The adaptability includes the ability to have singular behavior within an orthlet, allowing a sing…
A complete interpretation is proposed for the pre-edge fine structure (PEFS) of the x-ray Ti K-absorption spectra for perovskite structure crystals. The interpretation is based on the results of numerous calculations performed by a modified full multiple scattering method which provides the theoretical spectra for the…
We fabricated field-effect transistors based on individual single- and multi-wall carbon nanotubes and analyzed their performance. Transport through the nanotubes is dominated by holes and, at room temperature, it appears to be diffusive rather than ballistic. By varying the gate voltage, we successfully modulated the…
High-temperature molding of a mixture of epoxidized natural rubber (ENR) and intermediate super abrasion furnace (ISAF) carbon black results in strong rubber–filler interaction, the extent of which is greater in the case of the oxidized grade of the carbon black. It has been observed that ENR is bonded to the filler s…
Polymeric chains consisting of alternating Tl2Me4(thf)2 and O2C6H(Me)(t-Bu)−(t-Bu)(Me)HC6O2 (SQ−SQ) subunits have been formed by treating the parent bis(benzoquinone) with Tl(Me)2(3,6-DBSQ). Steric interactions between methyl substituents of adjacent rings result in a dihedral angle of 51.5° between ring planes and st…
Tensile properties, water vapor permeabilities, and water solubilities were determined for casein films plasticized with glycerol. The casein was precipitated from milk that was sparged with carbon dioxide (CO 2 ). The films were compared to those made from commercial calcium caseinate. Glycerol was added to plasticiz…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTFunctional Group Accessibility in Hydrogen-Bonded Polymer Blends. 3. Steric Shielding EffectsGeorge J. Pehlert, Paul C. Painter, and Michael M. ColemanView Author Information Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pe…
Oxidative polymerization of m-phenylenediamine was carried out using H2O2 as an oxidant and horseradish peroxidase as a catalyst in mixtures of aqueous buffer solution and 1,4-dioxane or in reversed micellar solutions. When the reaction mixture was brought into contact with a stainless steel stick, the obtained polyme…
The miscibility of poly(D,L-lactide) (PDLLA) and poly(p-vinylphenol) (PVPh) blends has been studied by differential scanning calorimetry and Fourier transform infrared spectroscopy (FTIR). Phase separation was observed in blends over a wide composition range. A PDLLA-rich phase was found to coexist with an almost pure…
The structural ordering within crystalline polyaniline (PANI) powders as emeraldine (i.e., at 50% oxidation) in both its base (EB) and halogen acid doped salt (ES) forms has been studied using X-ray diffraction. PANI−ES powder precipitates, obtained immediately after synthesis, have significant crystalline fractions w…
We have performed a detailed investigation of the solution-phase properties of the electrostatic complex formed between the sulfonated azo dye congo red (CR) and the peptide acetyl-YAAAKAAAAKAAAAKA-amide (YAK123). In contrast to amyloid, this complex had good solubility. Aqueous solutions of mixtures of YAK123 and CR…
Lamellar mesostructured aluminophosphates were synthesized from aluminum triisopropoxide and phosphoric acid; monododecyl phosphate surfactant was used as structure-directing template. Depending on the relative Al/P ratio in the samples, variable relative amounts of tetrahedrally and octahedrally coordinated Al are fo…
Silica–alumina catalysts of varying acidity were used for polymerization of hexamethyl cyclotrisiloxane and octamethyl cyclotetrasiloxane monomers (cyclic trimer and tetramer, respectively). Acidic sites of silica–alumina are responsible for the polymerization and variation in the acidity of the catalyst were shown to…
Natural rubber (NR) was blended in various ratios with 29 kinds of tackifier resins, which were prepared from rosin, terpenes, and petroleum. Miscibilities of all the blend systems were illustrated as phase diagrams. From these blend systems, we selected 7 systems having typical phase diagrams [completely miscible, co…
Specimens of epoxy resin reinforced with ultrahigh-modulus polyethylene (UHMPE) fibers were immersed in water, and their swelling characteristics were recorded at various temperatures. In addition to an estimation of the response of those composite, the above study aimed at the exploration of the role of the fiber–mat…
Oxygen quenching of the luminescence of mononuclear and dinuclear Ir(III) cyclometalated complexes immobilized in the pPEGMA matrixes has been studied. Linear Stern-Volmer plots, even when experiments at different emission wavelengths have been performed, were evidenced. Despite the different luminescence lifetimes of…
We consider a three-dimensional liquid drop sitting on a rough and chemically heterogeneous substrate. Using a novel minimization technique on the free energy of this system, a generalized Young's equation for the contact angle is found. In certain limits, the Cassie and Wenzel laws, and a new equivalent rule, applica…
The complex refractive index of phase-change Ge<SUB>2</SUB>Sb<SUB>2+x</SUB>Te<SUB>5</SUB> media fabricated by DC magnetron sputtering has been determined by using spectroscopic ellipsometry and atomic force microscopy. The composition of Ge<SUB>2</SUB>Sb<SUB>2+x</SUB>Te<SUB>5</SUB> analyzed by Inductively Coupled Plas…
The complexity of biomineralized structures suggests the potential of organic constituents for controlling energetic factors during crystal synthesis. Atomic force microscopy was used to investigate the thermodynamic controls on carbonate growth and to measure the dependence of step speed on step length and the depend…