Materials Literature
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Abstract There are two different views regarding the genesis of gibbsite in tropical acid soils: (1) direct weathering of primary Al-silicate minerals; and (2) transformation through clay mineral intermediates. We investigated the genesis of gibbsite in two representative Ultisols from northeastern India. Gibbsite in…
The removal of small particles is vital for contamination-free manufacturing. In humid environments liquid can condense between the particle and substrate and give rise to a very large capillary force, which increases the total force of adhesion. The removal and adhesion forces of polystyrene latex (PSL) particles and…
Tetragonal ZrO 2 nanocrystallites—with or without yttria (3 mol%) doping—have been synthesized via a precipitation process in which the hydrous oxide precipitate reacts with hexamethyldisilazane (HMDS) vapor before calcination. The nanocrystallites are formed and retain a tetragonal structure for hours after calcinati…
Blazed-binary gratings for which a blazed effect with binary etches is achieved under normal incidence offer first-order diffraction efficiencies larger than those of blazed-échelette gratings in the resonance domain [Opt. Lett. 23 1081 (1998)]. We provide further insight into the behavior of blazed-binary gratings an…
Aluminum subjected to smooth mechanical loading does not often deform in a correspondingly smooth manner. Typically it deforms inhomogeneously through the propagation of deformation fronts that slowly traverse the sample. These are called Portevin-Le Chatelier fronts; what determines their velocity has been somewhat m…
Biodegradability and interesting physical and mechanical properties of polypropylene (PP)/cellulose composites are the essential motive for undertaking fundamental studies of various properties of such materials. An addition of lignocellulosic particles to polymers results in a change in properties of the product obta…
Natural fiber/thermoplastic composites were made using aspen fiber and polypropylene. Several different levels of aspen fiber (30 to 60% by weight) were used with and without the addition of a compatibilizer (maleic anhydride grafted polypropylene, MAPP). These composites were tested for strength properties, exposed t…
This article is a summary of a presentation which was given at the 4th International Conference on Catalysis in Membrane Reactors (ICCMR 2000), which was held 3–5 July 2000 in Zaragoza, Spain. At an earlier ICCMR meeting which was held during 1994 in Lyon, France there was some optimism that by now we would see some c…
The magnetocaloric effect in polycrystalline of Pr 1 − x Sr x MnO 3 ( x = 0.3, 0.4, 0.5) was investigated. A large magnetic entropy change (7.1 J/kg K) is discovered in Pr 0.5 Sr 0.5 MnO 3 under a low magnetic field of 1 T at charge-ordered state transition temperature (161 K). The physical mechanism is related to a d…
Hydrogenated amorphous silicon carbide films with an organic–inorganic compound structure were fabricated by using organic carbon source xylene (C8H10), in a traditional radio frequency plasma-enhanced chemical vapor deposition system. Strong full-color light emission ranging from 630 to 420 nm was observed at room te…
Zirconia-loaded alumina samples were prepared and used as supports for platinum and tin metallic phases. X-ray diffraction patterns of 9.0 and 13.0 wt % ZrO 2 -loaded alumina samples showed the characteristic lines of the tetragonal ZrO 2 phase. For the base alumina and these two supports, the nitrogen adsorption−deso…
Abstract New optical oxygen sensors based on the luminescence intensities of four different europium(III) complexes, ((1,10-phenanthroline)tris(thenoyltrifluoroacetonato)europium(III) complex ([Eu(tta)3phen]), tris(thenoyltrifluoroacetonato)europium(III) dihydrate ([Eu(tta)3]·2H2O), tris(1,1,1-trifluoro-5,5-dimethyl-2…
Based on the virtual crystal approximation (or Vegard's law), the bond lengths of Ti 1− x Sn x O 2 were deduced from those of TiO 2 and SnO 2 , to allow the oxygen position and octahedral distortion to be determined as a function of x . The oxygen positional parameter ( u ) increased linearly when the Sn 4+ cation (wh…
Investigates the potential for building smart seams by incorporating optic fibers ultrasonically. The heating and bonding mechanisms of ultrasonic welding process in fabrics were studied. Battle dress uniform (BDU) (50/50 nylon/cotton), 100 percent cotton, 100 percent polyester and Nomex fabrics were used and were bon…
Graphite wall materials are used in present day fusion devices in order to optimize plasma core performance and to enable access to a large operational space. A large physics database exists for operation with these plasma facing materials, which also indicate their use in future devices with extended burn times. The…
Abstract Pressure‐Volume‐Temperature ( PVT ) behavior of three biodegradable polymers, Polylactide, poly(butylene succinate), and poly(butylene succinate‐co‐adipate), was measured at temperatures from 313 to 493 K and pressures up to 200 MPa. The PVF data in molten state were compared with predicted values of a group…
Anionic polymerization of isoprene initiated by an alkyl lithium containing a silyl ether protected hydroxyl functionality followed by termination with ethylene oxide gave α,ω-functionalized polyisoprene with narrow molecular weight distribution and prescribed molecular weight in high yield. Deprotection resulted in α…
A series of poly(butylene terephthalate- co -butylene 2,6-naphthalate) (P(BT- co -BN)) random copolymers were synthesized, and their cocrystallization behavior was investigated by differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD). The P(BT- co -BN) copolymers, which are found to be statis…
The enzymatic ring-opening polymerization of 6-membered cyclic depsipeptides, 3(S)-isopropyl-morpholine-2,5-dione, 3(R)-isopropyl-morpholine-2,5-dione, 3(R,S)-isopropyl-morpholine-2,5-dione, (3S, 6R,S)-3-isopropyl-6-methyl-morpholine-2,5-dione, 3(S)-isobutyl-morpholine-2,5-dione, 3(S)-sec-butyl-morpholine-2,5-dione, 6…
Abstract The crystal structure of synthetic ‘plumbonacrite’, Pb 5 O(OH) 2 (CO 3 ) 3 , hexagonal, P6 3 cm , a = 9.0921(7), c = 24.923(3)Å, V = 1784.3(3)Å 3 , Z = 6, has been solved by direct methods and refined to R = 0.049. There are six symmetrically independent Pb 2+ positions in the structure, the coordination poly…