Materials Literature
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Many theoretical and experimental studies have been conducted to understand the mechanisms of heat and mass transfer during deep fat frying. This, in turn, has helped in understanding transport phenomena during frying and the relationships between thermal and physical properties of the products and the frying media. M…
This paper reports the magnetic, electrical, and microstructural properties of epitaxial thin films with an ordered double-perovskite structure. Sr/sub 2/ FeMoO/sub 6/ (SFMO) and Sr/sub 2/ CrReO/sub 6/ (SCRO) films have been grown by sputtering onto the lattice-matched substrates of Ba/sub 0.4/ Sr/sub 0.6/ TiO/sub 3/…
In this paper we show how the grain size of metallic sputtered films can be controlled using a novel sputtering technology (HiTUS). This is evidenced by TEM and grain size analysis, which show changes of up to a factor 10in the mean grain diameter of CoFe thin films. We achieved the grain size control by tuning the ta…
PURPOSE: To establish a reproducible laboratory test to evaluate prospective vascular biomaterials with respect to their thromboinflammatory properties by examining fibrinogen, platelet, and monocyte binding. Endothelial migration onto these surfaces was used as an index of vascular healing. METHODS: To evaluate bioma…
Howmet and Boeing-Seattle jointly evaluated the castability and mechanical characteristics of a modified Russian titanium alloy, Ti-5AI-5Mo-5V-3Cr-0.5Fe (Ti-5553), using wrought alloy starting stock supplied by Boeing. The casting studies conducted at Howmet showed the alloy to be comparable to Ti-6AI-2Sn-4Zr-2Mo-0.08…
We have studied magnetic, electrical properties, and structure of Cr-AlN and Mn-AlN thin films grown on the Si substrates. Each magnetic state in Al/sub 0.93/Cr/sub 0.07/N and Al/sub 0.91/Mn/sub 0.09/N thin films changes from a paramagnetic state to a superparamagnetic state as temperature decreases. Room temperature…
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…