Materials Literature
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[reaction: see text] A family of pi-conjugated dendrimers based on truxene and thienylethynylene units are synthesized via a mixed divergent/convergent growth approach. These dendrimers possess an intrinsic energy gradient from the periphery to the core through branches and thus show a broad absorption in the UV-vis r…
Platinum-containing MCM-41 was synthesized in a one step approach. In this new procedure, the swelling agent (toluene) was used as a transport medium to inject the Pt precursor, Pt(acetylacetonate) 2, directly into the inner core of the surfactant micelles. A 1 wt % metal loading was achieved without the loss of pore…
[structure: see text] Core-modified aromatic decaphyrins with 42pi conjugated electrons exhibit the highest two-photon absorption cross-section value (sigma(2) = 108,000 GM) known for any organic molecule, suggesting possible device applications in the field of nonlinear optics.
Thermochromic undoped and metal (Ti and W)-doped VO2 smart coatings were achieved on Kapton HN by reactive pulsed laser deposition. The optimization of the deposition was conducted with Si (100) substrates. The coatings were deposited at relatively low deposition temperatures (250, 300, and 350°C), which are compatibl…
The arc process remains the easiest and cheapest technique to obtain significant quantities of single wall carbon nanotubes (SWCNTs) with excellent structural properties. These nanotubes are quite straight and present few topological defects. However, the major inconvenience of this process remains the difficult in si…
Amorphous, hydrolytically degradable, multi‐phase block copolymer networks were obtained by photocrosslinking. The macrodimethacrylate precursors were prepared by ring‐opening polymerisation (ROP). The aim of this investigation to tailor the materials' elasticity in the temporary shape could be achieved. Stress‐contro…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
Partially Bi-substituted [Ca 2 CoO 3 ] p CoO 2 ceramics were synthesized using a hot-forging technique. Then, the effects of Bi-substitution on microstructure and thermoelectric properties were evaluated. The average grain size of the precursor powder prepared by a solid-state reaction increased concomitant with the i…
A new experimental method describing the determination of the mechanical spectra (complex Young’s modulus Y*=Y′+iY″ versus temperature) of materials from the liquid to the glassy state, including the glass transition, is reported. The conventional vibration-reed method developed for solids is extended to composite sys…
The hydrogen influence on the microstructure of the austenitic-ferritic Cr22-Ni5-Mo3 stainless steel was investigated. Cathodic hydrogen charging was performed electrochemically from aqueous solution of 0.1M H2SO4 with hydrogen entry promoter addition. The aim of this study was to reveal microstructural changes appear…
Three-dimensional numerical calculations have been performed for a transient moderator circulation inside the CANDU (Canada Deuterium Uranium) calandria vessel of Wolsong Units 2/3/4. The porous media approach was applied for the core region containing 380 calandria tubes. An anisotropic hydraulic resistance model for…
The effects of the chemical composition of α + β brasses and heat treatment conditions on the amount, morphology, and chemical composition of the phases forming these brasses have been studied. Apart from the main phases (an α solid solution of alloying elements in copper and a β phase based on the electronic compound…
Cyclotella alchichicana sp. nov. is described from Lake Alchichica, Puebla, Mexico, a saline and alkaline crater-lake in Central Mexico. The new species is similar to C. quillensis from which it distinguished by the arrangement of the marginal fultoportulae and by the external opening of the rimoportula that is elonga…
Damage caused by lubricant borne particles in rolling/sliding contacts can severely reduce the operational life of machine elements such as cam mechanisms, roller bearings, gears, and pumps. Lubricant supplies frequently contain such contaminating particles, either generated from within the machinery itself or entrain…
All-dielectric optically active planar chiral metamaterials have been fabricated by electron beam lithography. We have demonstrated the effectiveness of a polymeric charge dispersion layer in dramatically reducing charge buildup during the exposure of chemically amplified resists on dielectric substrates. This techniq…
Three beta-diketonate complexes of erbium and ytterbium, Er(HFA)3(TPPO)3, Yb(HFA)3(TPPO)3, and Er(1/2)Yb(1/)(2)(HFA)3(TPPO)2 (HFA = hexafluoroacetylacetonate, TPPO = triphenylphosphine oxide) are synthesized and structurally characterized, and their luminescent properties are examined in detail. Compared with monometa…
The microstructure and crystallographic texture characteristics were studied in a 22Cr-6Ni-3Mo duplex stainless steel subjected to plastic deformation in torsion at a temperature of 1000 degrees C using a strain rate of 1 s(-1). High-resolution EBSD was successfully used for precise phase and substructural characteriz…
Cigarette smokers deposit less collagen, expressed as hydroxyproline, in granulation tissue than nonsmokers. We studied the effect of abstinence from smoking and transdermal nicotine patches on deposition of hydroxyproline, proline, type I procollagen, and total proteins. Fifty-four healthy smokers were studied during…
Accurate estimation of the CMC and aggregation numbers of individual surfactants is necessary to predict aggregation properties of surfactant mixtures, as well as to produce materials with controlled structures in the template synthesis. Thermodynamic equations are established to predict the aggregation behavior of ce…
There are numerous industrial uses of superhard materials such as polycrystalline diamond, natural diamond, and tungsten carbide. These include tooling for mechanical processing as well as robust substrates for microelectronics in extreme environment applications. Processing these materials has presented a perennial p…