Materials Literature
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Multilayers of 200-nm thick Co-free or Co-doped Nd-Fe-B with 10-nm thick Ta were prepared by sputtering on heated glass substrates and investigated into the microstructure, texture and hard magnet properties. The perpendicularly textured Nd/sub 2/Fe/sub 14/B grains evolved in the multilayers with sizes neatly controll…
Fe-Si magnetic film and Mn-Ir/Fe-Si exchange-coupled film with an Ru underlayer were fabricated and evaluated. Both coercivity and anisotropy dispersion were reduced due to the Ru underlayer effect on the magnetic properties of Fe-Si magnetic film and Mn-Ir/Fe-Si exchange-coupled film. Even in the Mn-Ir/Fe-Si exchange…
A hexaphenylbenzene scaffold has been used to organize the components of artificial photosynthetic antennas and antenna-reaction center mimics that feature bis(phenylethynyl)anthracene antenna moieties and porphyrin-fullerene charge-separation units. The five bis(phenylethynyl)anthracene chromophores absorb in the spe…
Infrared spectroscopy and analysis of photoluminescence spectra have been used to study variations in the composition of the oxide phase in a SiO x film and the precipitation of the Si phase in the course of a rapid thermal annealing for 1–40 s at temperatures of 500–1000°C. Kinetics of phase segregation has been obse…
Studying the properties and stability of silicon nanoparticles (Si-np) in aqueous environments may lead to novel applications in biological systems. In this work, we use absorption and photoluminescence (PL) spectroscopy to characterize ultrasmall Si-np prepared through anodic etching and ultrasonic fractionation of a…
Pulsed laser ablation of Ge 2 Sb 2 Te 5 target materials at approximately 400 Pa of ambient argon gas produces amorphous nanoparticles with a size distribution of from 4 to 30 nm. Thermal treatment of the nanoparticles in their aerosol states crystallizes the particles to both a hexagonal structure and a face-centered…
The physicochemical properties of two molten salts, namely, KCl and NaCl, have been studied with a molecular-dynamics approach using a density-functional-based tight-binding (DFTB) model. The obtained results have been compared with a number of previously reported simulations, carried out on smaller systems and using…
Abstract Jute fiber (Hessian cloth) reinforced low-density polyethylene (LDPE) composites were prepared by heat press molding techniques. The mechanical properties such as tensile strength (TS), bending strength (BS), and elongation at break of the composites were studied. The enhancement of TS (33%) and BS (50%) were…
This paper provides useful insights into the nonlinear buckling phenomenon of fibrous materials. In the analysis, a fiber is considered to be a rectangular, prismatic, inextensible column with no shear effect, whose constitutive equation corresponds to a Ludwick or modified Ludwick type. Governing equations of the buc…
Zn/sub 1-x/Fe/sub x/O (x=0.00,0.01,0.03,0.05,0.07, and 0.10) compounds were fabricated by the sol-gel method. The crystal structure and magnetic properties were investigated as a function of doped Fe concentration. Specifically, we have used hydrogen treatment for the control of phase separation. The X-ray diffraction…
Thin films of cubic zinc nitride, Zn3N2, were obtained by metal-organic (MO)CVD at substrate temperatures between 275 °C and 410 °C. Bis[bis(trimethylsilyl)amido]zinc was used as source for Zn and ammonia as the N source. The films were deposited on SiO2/Si(100) and on zinc oxide-coated sapphire (c-plane Al2O3). Polyc…
Results from the neutron irradiation experiments show that the radiation tolerance is very high for Sm/sub 2/Co/sub 17/-type magnets and is fairly low for Nd-Fe-B-type magnets. The analyses show that the major radiation damage in permanent magnets is caused by a radiation-induced thermal spike accompanied by a localiz…
Complexes of Eu3+, Tb3+ and Gd3+ with dipicolinic acid, chelidamic acid and chelidonic acid have been synthesized in order to study the effect of the substituent groups on the luminescence of the lanthanide complexes. The luminescence of the Eu3+ and Tb3+ complexes was quantified by quantum yield measurements. The com…
Monodisperse superparamagnetic iron oxide nanoparticles (SPIONs) were prepared by thermal decomposition of Fe(CO)/sub 5/ and by consecutive aeration in organic medium. The resultant hydrophobic SPION surface was modified to be hydrophilic via Fe-S covalent bond with bi-functional 3-mercaptopropionic acid and then, the…
Rotational magnetic loss in magnetic core materials has been examined with respect to the direction of rotation at high magnetic flux density by a newly developed two-dimensional magnetic measurement method. The rotational losses in clockwise or anticlockwise directions depend largely on inclination angle of magnetic…
A three-phase, two-winding transformer model is presented in this paper. Nonlinear magnetizing curves are piecewise linearized, while the input winding capacitances are lumped onto the transformer terminals. A stiff system of differential equations in a state space, describing the transformer transient behavior, is so…
For SPME-HPLC, metal wires with better mechanical strength are preferred over the fused silica fibers. In this article, a novel composite polyaniline (CPANI) doped with PEG and polydimethylsiloxane coating (CPANI fiber) was prepared on a stainless steel wire by a three-electrode system: the fiber was used as the work…
The build up and electrochemical characterization of interfacial composite nanostructures containing a cationic polyelectrolyte and negatively charged mercaptosuccinic acid stabilized gold nanoparticles (AuNPs) is reported. The nanostructures were formed at the interface between two immiscible electrolyte solutions in…
The crystal structures of polyphite, Na5 (Na4Ca2) Ti2 [Si2O7] (PO4)3 O2 F2, triclinic, space group P 1, Z = 2, a 5.3933(2), b 7.0553(3), c 26.451(1) A, α 95.216(1), β 93.490(1), γ 90.101(1)°, V 1000.44(8) A3, and sobolevite, Na12 Ca (NaCaMn) Ti2 (Ti Mn) [Si2O7]2 (PO4)4 O3 F3, monoclinic, space group Pc , Z = 2, a 7.07…
Gas-phase Au atoms deposited onto a multilayer film of molecular oxygen produce atomic oxygen bound to gold clusters. After removal of molecular O2, temperature programmed desorption and molecular beam techniques show that the atomic oxygen readily reacts with CO to produce CO2. At present, the structure and size dist…