Materials Literature
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Thin films of zinc oxide were deposited by dc reactive magnetron sputtering onto glass substrates held at a temperature of 663 K and oxygen partial pressure of 1x10-3 mbar, and at different sputtering pressures in the range 3x10-2 - 10x10-2 mbar. The effect of sputtering pressure on the structural, electrical and opti…
Pb(Zr, Ti)O 3 (PZT) thin films with Zr/(Zr+Ti) of 0.42 were prepared on (111)Pt/Ti/SiO 2 /Si substrates at 620°C by metalorganic chemical vapor deposition (MOCVD). We attempted the pulse introduction of a mixture of source gases into the reaction chamber and succeeded in simultaneous improvements of the crystallinity,…
Synechocystis sp. strain PCC6803 possesses a polyhydroxyalkanoate (PHA)-specific beta-ketothiolase encoded by phaA(Syn) and an acetoacetyl-coenzyme A (CoA) reductase encoded by phaB(Syn). A similarity search of the entire Synechocystis genome sequence identified a cluster of two putative open reading frames (ORFs) for…
Abstract The effects of the incorporation of different types of fibers on the crystallization kinetics and thermodynamics of isotactic polypropylene (iPP) are investigated. The study is mainly performed by thermal analysis, both in isothermal and constant cooling rate conditions, utilizing differential scanning calori…
Cellulose and their derivatives only rarely form molecularly dispersed solutions. Colloidal aggregates of yet not fully explored supramolecular structure remain preserved even at the highest dilution. The present contribution is concerned with the determination of the number of aggregated chains per colloid particle.…
Abstract The fatigue mechanism of photochromic 1,2-bis(2,5-dimethyl-3-thienyl)perfluorocyclopentene was studied in hexane solution. Upon irradiation with ultraviolet light, two kinds of by-products were produced in addition to normal photochromic reactions. The major by-product was isolated by HPLC, and was characteri…
The nonlinear oscillations of a spherical, acoustically forced gas bubble in nonlinear viscoelastic media are examined. The constitutive equation [Upper-Convective Maxwell (UCM)] used for the fluid is suitable for study of large-amplitude excursions of the bubble, in contrast to the previous work of the authors which…
The structure of PbO–B 2 O 3 glasses has been investigated in the composition range of 25–80 mol% PbO by using X‐ray diffraction and 11 B NMR techniques. The well‐separated peaks due to Pb–O and Pb–Pb pairs were first observed in the radial distribution function, and peak deconvolution was performed by using a pair fu…
Thermochromic monoclinic-tetragonal VO 2 films were successfully deposited on glass substrates with high reproducibility by rf magnetron sputtering using V 2 O 3 or V 2 O 5 targets. In the case of reactive sputtering using a V-metal target, the VO 2 films could be obtained only under the very narrow deposition conditi…
Abstract This paper presents an experimental study on foam processing of polystyrene (PS) and high‐impact polystyrene HIPS/wood‐fiber composites in extrusion using moisture as a blowing agent. Wood‐fiber inherently contains moisture that can potentially be used as a blowing agent. Undried wood‐fiber was processed toge…
The metastable ${\mathrm{Ni}}_{3}\mathrm{C}$ phase has been produced by mechanically alloying Ni and C. ${\mathrm{Ni}}_{3}\mathrm{C}$ particles of diameter 10 nm are produced after 90 h of mechanical alloying with no evidence of crystalline Ni in x ray or electron diffraction. Linear muffin-tin orbital band-structure…
Temperature-programmed reaction spectroscopy has been used to study the surface reaction between CO and O-atoms on Rh(100) and Rh(111) at a range of different adsorbate coverages. Comparison of the reaction on both surfaces in the low coverage regime, where the kinetics can be described by a straightforward Langmuir–H…
We compare the crystallization behavior of thin films of Ge2Sb2.3Te5 in various amorphous states, namely, as-deposited, melt-quenched, and primed. These films are embedded in a quadrilayer stack similar in structure to the commercially available phase-change optical disks. This study shows that the melt-quenched amorp…
Two-dimensional (2D) photonic crystals were fabricated using anodic porous alumina with a highly ordered air-hole array of triangular lattice with a high aspect ratio of over 200. The transmission properties of the obtained ordered air-hole array in the alumina matrix exhibited a stop band in the spectrum which corres…
The influence of three dicarboxylate anions, oxalate, (C 2 O 4 ) 2 -, glutarate, (H 6 C 5 O 4 ) 2 -, and pimelate, (H 10 C 7 O 4 ) 2 -, on the self-condensation process of the [Mo 2 S 2 O 2 ] 2+ dithiocation has been investigated. [Mo 8 S 8 O 8 (OH) 8 (C 2 O 4 )] 2 - ([Mo 8 -ox] 2 - ), [Mo 10 S 10 O 10 (OH) 10 (H 6 C…
Polyoxometalates of colloidal size have been immobilized in a silica-matrix via sol-gel synthesis. The resulting (porous) materials exhibit the unique properties of both the polyoxometalates (POMs) and of the host silica. The pocket molded into the silica by the POM-cluster acts as a special nano-dimensional “reaction…
Raman scattering, 119Sn Mössbauer spectroscopy and temperature-modulated differential scanning calorimetry experiments have been performed on (Ge0.99 Sn0.01)x Se1−x glasses in the 0.30 < x < 0.36 range. Both Raman and Mössbauer spectroscopies show that Ge‒Ge signatures first appear near x = 0.31(1), and their concentr…
Systematic ab initio calculations of lattice constants, elastic constants and magnetic moments of Fe, Co and Ni in bcc, fcc and hcp structures have been carried out, in part to understand the phase stability and magnetic properties of artificial Fe, Co and Ni structures. The calculations are based on the local spin-de…
An avalanche of physical and physicochemical phenomena, often self-sustained, leads to the end of life of an insulating material. The collapse of the insulating role of a material is mostly due to the electrical field stress. The path leading from the catastrophic situation, the breakdown, back to its origin is follow…
Metal sulfide cores self-encapsulated in shells of the same material are formed via the in-situ source–template interface reaction route described by these authors. In this method, reaction occurs at the static organic/aqueous interface to produce peanut-shaped nanostructures of either CdS or ZnS (see Figure). A mecha…