Materials Literature
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The local structures of ${\mathrm{Zn}}_{1\ensuremath{-}x}{\mathrm{Mg}}_{x}\mathrm{O}$ alloys have been studied by Raman spectroscopy and by synchrotron x-ray pair-distribution-function (PDF) analysis. Within the solid solution range $(0\ensuremath{\leqslant}x\ensuremath{\leqslant}0.15)$ of ${\mathrm{Zn}}_{1\ensuremath…
Using inverse statistical-mechanical optimization techniques, we have discovered isotropic pair interaction potentials with strongly repulsive cores that cause the tetrahedrally coordinated diamond and wurtzite lattices to stabilize, as evidenced by lattice sums, phonon spectra, positive-energy defects, and self-assem…
( K 0.5 Na 0.5 ) Nb O 3 (KNN) based lead-free materials exhibit arguably, comparable piezoelectric properties to conventional Pb(Zr,Ti)O3 ceramics owing to an orthorhombic to tetragonal polymorphic phase transition (TO-T) occurring near room temperature. However, this transition correspondingly results in a strong tem…
Reversible control of magnetism is reported for a Fe thin film in proximity of a $\mathrm{Ba}\mathrm{Ti}{\mathrm{O}}_{3}$ single crystal. Large magnetization changes emerge in response to ferroelectric switching and structural transitions of $\mathrm{Ba}\mathrm{Ti}{\mathrm{O}}_{3}$ controlled by applied electric field…
The Kirkendall effect is a consequence of the different diffusivities of atoms in a diffusion couple causing a supersaturation of lattice vacancies. This supersaturation may lead to a condensation of extra vacancies in the form of so-called "Kirkendall voids" close to the interface. On the macroscopic and micrometer s…
To develop a new drug delivery system, antibacterial 50–900 nm nanoparticles of shell and internal organs from scallops collected off Huksan-Island, Korea, were prepared by dry grind technology respectively. The diameters, identities, and conformations of the scallop shell and internal organ particles were determined…
The influence of extended duration (up to 1000 h), low temperature oxidation heat‐treatments (375°–600°C) has been assessed using a model ceramic matrix composite system with a graphitic fiber/matrix interphase. For this study a Nicalon ™ fiber reinforced CaO–Al 2 O 3 –SiO 2 matrix composite was selected (Nicalon ™ /C…
The adsorption states and dissociation process of oxygen on Cu(100) at 40 K were investigated using high-resolution electron energy loss spectroscopy. The dissociation of O 2 occurs on the bare Cu(100) surface via a mobile precursor at 40 K. This precursor was not observed as a stable intermediate. The chemisorption s…
Abstract Mesoporous silica and carbon with high surface area and large pore size were readily prepared in a dilute silica solution at pH ≈4.0–6.0 by using the biodegradable gelatin or gelatin–phenol–formaldehyde polymer blend as template.
The influence of the chemical composition on structural properties and electrical conductivity of solid solutions based on the system Y−Ce−ZrO 2 obtained by the hydroxide precipitation method is investigated. The samples are studied by combining impedance spectroscopy, X-ray powder diffraction, and scanning electron m…
We have observed bright photoluminescence (PL) from single-walled carbon nanotubes (SWNTs) on self-assembly monolayer (SAM) functionized SiO 2 /Si substrates. By contrast, no PL was observed from pristine SWNTs grown on substrates (SiO 2 /Si and Al 2 O 3 ). This suggests a successful blocking of substrate-induced nonr…
Optical absorption, photoluminescence, and Raman scattering spectra of poly(para-phenylene vinylene) (PPV) and single-walled carbon nanotube (SWNT) composite films are investigated at room temperature. Samples have been prepared at different precursor conversion temperatures, T c, (300, 180,and 120 °C) and with SWNT m…
Zero field and longitudinal field muon-spin relaxation measurements were carried out for the single-chain magnet catena -[Fe II (ClO 4 ) 2 {Fe III (bpca) 2 }]ClO 4, to reveal the growth of short-range spin ordering in the zero-external magnetic field below 6 K.
Single-crystalline Zn 1- x Mn x O ( x = 0.05, 0.1, and 0.2) nanowires were synthesized using the thermal vapor transport method. Their X-ray diffraction patterns reveal the monotonous expansion of the lattice constants with increasing Mn content, due to the effective Mn doping. The electronic structures of the Zn and…
Reports on PZT films often suggest the contradicting presence of Pb‐deficient pyrochlore (Py) and a Pb‐rich layer on the surface. We show that standard Ar + ion sputtering X‐ray photoelectron spectroscopy (XPS) depth profiles of PZT films artificially exhibit a Pb‐rich surface, independent of actual Pb content of the…
Vapor-phase synthesis of 2-methylpyrazine (2-MP), from propylene glycol (PG) and ethylenediamine (ED), has been studied over ferrite catalysts in a temperature range of 523−773 K. The performance of MnFe 2 O 4 was observed to be better than that of Zn 1 - x Mn x Fe 2 O 4 ( x = 0, 0.25, 0.5, 0.75). The reaction was det…
Complex materials as fuel oils are characterized by physical and chemical parameters. This paper deals with the determination of the activation energy of three kinds of Brazilian fuel oils. As it is possible to establish a direct relation between ignition delay and activation energy, these kinetic parameters can be us…
The dielectric and piezoelectric properties of SrBi 2− x Sm x Nb 2 O 9 ( x =0, 0.05, 0.1, 0.2, 0.3, and 0.4) ceramics were investigated. SrBi 2− x Sm x Nb 2 O 9 ceramics were synthesized by the conventional solid‐state reaction sintering method. An X‐ray diffraction measurement indicated that a single‐phase‐layered pe…
An acid recrystallization process for synthesis of ultrafine TATB (UF-TATB) of median particle size < 5 µm is described. The process uses production grade TATB (PG-TATB) of median particle size > 50 µm. PG-TATB is made soluble in DMSO-alkali. Acidification of this basic solution is done with dilute aqueous nitric acid…
High Resolution Image Download MS PowerPoint Slide Physical and chemical properties of single-walled carbon nanotubes (SWCNTs) are sensitive to the defects in the tubular graphene. To date, however, the method to characterize the defect of SWCNTs has been limited to transmission electron microscopy (TEM) and atomic fo…