Materials Literature
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The simultaneous two‐photon excitation energy transfer (SEET) was demonstrated for the first time using trichromophoric model compounds. Two identical donors (A–antenna) were covalently linked to an energy acceptor unit (T–target) with different energy levels preventing energy transfer of a single photon. At high inte…
Different types of molecular motion in confined nematic liquid crystals are briefly discussed with emphasis on their detectability by methods of nuclear magnetic resonance and relaxation. The review is illustrated by some recent experimental and theoretical results in this field.
Adsorption equilibria for solvent dehydration, namely, removal of trace water from solvents by inorganic adsorbents such as silica gels and activated alumina, were measured for various combinations of solvents and adsorbents to test the applicability of the capillary phase separation concept to these systems. The conc…
Specimens of 316L stainless steel are irradiated with 2.5 MeV He+ ions at temperatures of 400,500 and 550℃,respectively.For each implantation the dose and dose rate are separately 2.5×1021 ion/m2 and (3.2—3.8)×1016 ion/m2s-1.Bubble structures are investigated with cross sectional transmission electron microscopy(XTEM)…
Thermoplastic polyimides are a relatively new class of polymers that exhibit high-temperature stability and are useful in composite applications. One such material is Avim-id® K3B reinforced with Magnamite® IM7 graphite fibers. This composite system exhibits excellent strength and toughness, retains its strength and t…
The lattice invariant shear of the martensitic transformations in the Ti36.5Ni48.5Hf15 alloy was determined as a (001)B19′ compound twin by in-situ TEM technique. The morphological features of the (001)B19′ twin lamellas were revealed in detail. The shapes of the martensite variants were either the form of triangular,…
Differential thermal analysis-thermogravimetry (DTA-TG), and electron scanning microscopy (ESM) were used to study the decomposition of nickel formate dihydrate in air. The results showed that the decomposition pro- ceeds in two successive TG steps, the first is due to dehydration and the second is due to decompositio…
A new concept in macromolecular design is described, using sequence configuration as the tool to control the topology of a compact polymer chain fold.
High resolution transmission electron microscopy (HRTEM) has been applied to verify the validity of the O-lattice theory for geometrical approach to the grain boundary structure, then periodic structures predicted from the O-lattice theory have been compared with the HRTEM images. In addition, the correlation between…
A Fourier Transform Infrared (FTIR) analysis using Fresnel Attenuated Total Reflectance (ATR) was performed on silica-filled cis-1,4-polyisoprene. Silica filler's detrimental effects on zinc-activated cure systems has been well documented. The silane coupling agent bis-(y-triethoxysilylpropyl)-tetrasulfide (Si-69) and…
Presently, continuous-fiber ceramic composites (CFCCs) are considered leading candidate materials for many high-temperature applications, such as high-pressure heat exchangers, radiant burner tubes, and engine combustors. To adequately evaluate these materials in their cylindrical configurations, a hoop tension test i…
Aromatic hydrocarbon resins with different molecular weights (Mw = 1300-50400 daltons) were added to a solvent-based polychloroprene adhesive. The hydrocarbon resins were characterized using infra-red (IR) and differential scanning calorimetry (DSC) measurements. The properties and compatibility of the polychloroprene…
Abstract This work underlines the influence of alloying elements zinc and gallium on the electrochemical behaviour of aluminium alloys used as sacrificial anodes. Both the single and joint effects of these two elements on the free corrosion potential, the corrosion current density, and the development of the passive r…
The reaction of the bis(ylide) gold complex [Au 2 {µ-(CH 2 ) 2 PPh 2 } 2 ] with strong acids (such as HClO 4 ) in the presence of diphosphines L–L afforded a mixture of heterobridged gold(I) complexes [Au 2 {µ-(CH 2 ) 2 PPh 2 }(µ-L–L)] + (L–L = Ph 2 PCH 2 CH 2 PPh 2 or Ph 2 PCH 2 PPh 2 ) and [PPh 2 Me 2 ] + . After ad…
Abstract Ba 6 Pr 2 Fe 4 O 15 (I), Ba 5 SrPr 2 Fe 4 O 15 (II) und Ba 5 CaPr 2 Fe 4 O 15 (III) wurden mit Hochtemperatur‐CO 2 ‐LASER‐Technik dargestellt. (I)–(III) kristallisieren mit hexagonaler Symmetrie, Raumgruppe C –P6 3 mc, (I): a = 11.808(2), c = 7,036(4) Å; (II): a = 11.689(2), c = 6.954(2) Å; (III): a = 11.602(…
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SummaryA hydrophobic coating formulated with maltodextrins, carboxymethylcellulose, propyleneglycol and a mixture of sorbitan esters was applied to pre-climacteric ‘Manila’ mangoes. The coated fruit were stored for 20 d at 25°C and 80–85% r.h. Changes in mesocarp hardness, as well as pectinesterase (PE), polygalacturo…
Cost is one of the major factors to be considered when choosing a thermal insulator. Design engineers continuously strive to provide the best at the lowest possible cost. In the tropics climatic conditions are essentially hot and humid and a cause for daily discomfort. To some extent, air-conditioning of buildings has…
Abstract Retention gape deactivated with Silicone OV‐1701‐OH show good chromatographic performance and remarkable stability against water induced stationary phase degradrdation. In an attempt to better understand the findamentals off the deactivation process using silanol terminated polysiloxanes, a fumed silica was d…
Austempered ductile cast iron (ADI) has emerged as a major engineering material in recent years. In addition to high strength and relatively light weight (compared to steel), it has high ductility, good wear resistance and good damping capacity. It has many potential applications such as automotive components (e.g. cr…