Materials Literature
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We have applied the Callaway theory and used a detailed account of three-phonon scattering processes to calculate the thermal conductivity of three AlN single crystal samples containing different amounts of oxygen and two AlN ceramic samples with different grain sizes and oxygen contamination levels. The N-drift contr…
Abstract A variational formulation and C 1 finite element scheme with adaptive mesh refinement and coarsening are developed for phase‐separation processes described by the Cahn–Hilliard diffuse interface model of transport in a mixture or alloy. The adaptive scheme is guided by a Laplacian jump indicator based on the…
Abstract This research focused on the manufacture a polarizing film with PVA iodinated at solution before casting (IBC) film, which was prepared by casting aqueous solutions of 10 wt % poly(vinyl alcohol) (PVA) containing boric acid with 0, 0.1, 0.5, and 1.0 mol/L of I 2 /KI aqueous solution, and I 2 /KI(1:2) with 0,…
Abstract N‐alkylated chitosan derivatives were synthesized in water containing acetic acid by the Michael addition reaction of chitosan with various acryl reagents. The chemical structures of the chitosan derivatives were characterized with Fourier transform infrared and 1 H‐NMR techniques. The 1 H‐NMR results indicat…
The structural and mechanical properties of the cubic spinel CSi2N4 (c-CSi2N4) are studied by first-principles total energy calculations based on the density-functional theory. It is found that the calculated lattice constants and bulk modulus are in good agreement with previous calculations. The elastic constants sho…
Seven perovskite samples in the LaxSr1−3x∕2TiO3 solid solution series were monitored in situ during irradiation with 1.0MeV Kr2+ ions using the intermediate voltage electron microscope-Tandem User Facility (IVEM) at Argonne National Laboratory. All the perovskites pass through the crystalline-amorphous transformation.…
Nanostructured porous silicon (PS) optical filters have been proposed for their use in biological and chemical sensing applications. PS, however, presents a reactive surface that must be adequately passivated in order to achieve the required chemical stability mandatory for sensing applications. In the present work, t…
Abstract Polypropylene (PP)/layered‐silicate organoclay nanocomposites and their fibers were prepared by melt compounding and melt spinning, respectively, in the presence or absence of compatibilizer (PP‐based maleic anhydride compatibilizer) to examine the effects of the organoclay dispersion and rheological behavior…
Density functional theory with local density approximation including on-site Coulomb interaction has been used to calculate the formation energy of the neutral and charged vacancy in germanium as a function of the Fermi level. The calculations suggest that vacancies in germanium are multiple-level acceptors with a fir…
Defect and phase equilibria have been investigated through the ferroelectric phase transition behavior of pure and equilibrated nonstoichiometric BaTiO 3 powders. The paraelectric–ferroelectric phase transition temperature ( T C – T ) was found to vary systematically with materials fabricated with different Ba/Ti rati…
We investigated the ceramics samples of multiferoic solid solution of relaxor ferroelectric Pb(Fe2∕3W1∕3)O3 with ferroelectric PbTiO3 (abbreviated as PFW-xPT; x=0, 0.25, and 0.37) by means of acoustic emission (AE) method and simultaneously using the dielectric measurement below 700K. A distinct AE response has been d…
Abstract The effect of freeze–thaw cycles and chitosan type (water‐soluble or insoluble) on the morphological and mechanical characteristics of poly(vinyl alcohol) (PVA)/chitosan hydrogels was investigated with scanning electron microscopy (SEM), uniaxial testing, and a biaxial tubular vessel inflation experiment. SEM…
Residual stresses develop in the sol-gel-derived ferroelectric thin films during the transformation of the metal-organic gel to the metal oxide upon thermal treatment and due to the thermal and elastic mismatch between the Pb(Zrx,Ti1−x)O3 (PZT) film and the substrate materials during cooling. In this study, residual s…
ZnO micro-/nano-structure film composed of urchin-like hierarchical ZnO units with bamboo-like branches has been successfully constructed on Zn foil substrate by a simple one-step thermal evaporation process using a mixture of ZnS and graphite powder as a source. Field-emission scanning electron microscope (FE-SEM) ob…
A combination of microscopic and macroscopic methods enables an insight into polarization reversal in the copolymer of vinylidene fluoride and trifluoroethylene. Piezoforce microscopy together with switching charge measurements suggests that the polarization reversal is impeded by the restricted geometry of the domain…
In order to improve the photoluminescence property of Eu(3+)-doped nanoparticles, Y(2)O(3):Eu(3+) nanoparticles were synthesized using the Pechini-type sol-gel method, then coated with SiO(2) shells by using the Stöber method for different coating times. The SiO(2)-coated nanoparticles were characterized by x-ray diff…
Abstract Seaweed (SW) is employed as filler to prepare composites on the basis of a polypropylene (PP) matrix in the ratio of 10 : 90, 20 : 80, 30 : 70, 40 : 60, and 50 : 50 (wt % SW : wt % PP) by compounding and injection molding. The tensile, bending and impact properties of the composites were investigated. The 30%…
A magnetic loading technique was used to ramp load pure aluminum and 6061 aluminum alloy to peak stresses of approximately 29GPa. The peak loading rate was approximately 106∕s, followed by unloading from peak stress at a rate of about 105∕s. The pure aluminum samples had impurity levels ranging from about 10ppmto0.5wt…
Cerium-doped lutetium pyrosilicate Lu2Si2O7:Ce3+ (LPS:Ce) single crystal samples grown via Czochralski method were annealed under air and H2 atmospheres from 350to1600°C. The x-ray excited luminescence spectra and UV as well as thermal stimulated luminescence spectra were measured. It was found that the luminescence e…
Abstract Amyloidfasern gehören zu den wichtigsten selbstorganisierten Strukturen in der Natur. Zahlreiche Proteine und Peptide mit unterschiedlichen Aminosäuresequenzen bilden unter verschiedenen Bedingungen solche sehr stabilen und hochgradig organisierten Assoziate, die man in Phasenzuständen von Flüssigkristallen b…