Materials Literature
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Proton nuclear spin relaxation has been for the first time extensively used for a structural and dynamical study of low-molecular-weight organogels. The gelator in the present study is a modified phenylalanine amino acid bearing a naphthalimide moiety. From T(1) (spin-lattice relaxation time in the laboratory frame) a…
In this work, effects of interstitial oxygen on the ferromagnetism in Gd-doped GaN system were investigated via first principles, including both total energy and band structure calculation. The results of these calculations indicate that splitting interstitial sites oxygen is a plausible candidate for defect-induced m…
We study theoretically the deposition of few layer graphene sheets onto a grooved substrate incorporating adhesion between substrate and sheet. We develop a model to understand the equilibrium of the sheet allowing for partial conformation of sheet to substrate. This model gives physical insight into recent observatio…
In this work, Fe2Ni2N powders were prepared by calcinating a nanofiber-like precursor in flowing ammonia. It was found that the nitridation temperature is critical to controlling the phase composition of the target products, and the single-phased Fe2Ni2N with high saturation magnetization is obtained after calcination…
The effect of the substitution of yttrium for bismuth in BiCrO${}_{3}$ distorted perovskite has been investigated by means of magnetic measurements and symmetry mode analysis of neutron and x-ray powder diffraction data. Bi${}_{1\ensuremath{-}x}$Y${}_{x}$CrO${}_{3}$ compounds were synthesized under high pressure and h…
The effect of magnesium on grain boundary cohesion in aluminum was investigated by means of first-principles calculations using the Rice-Wang model [Rice and Wang, Mater. Sci. Eng. A 107, 23 (1989)]. It is demonstrated that magnesium is a cohesion enhancer with a potency of −0.11 eV/atom. It is further determined thro…
The self-diffusion coefficients D and the viscosities η of elemental Ni, Cu, and Ni-Si alloys have been calculated over a wide temperature range by molecular dynamics simulations. For elemental Ni and Cu, Arrhenius-law variations of D and η with temperature dominate. The temperature dependence of Dη can be approximate…
Single crystals of NaBa(4)Al(2)B(8)O(18)Cl(3) have been grown with sizes up to 34 × 34 × 16 mm(3) from the NaF-LiCl flux by the top-seeded solution growth method. The compound crystallizes in the tetragonal system, space group P4(2)nm, with a = 12.0480 (16) Å, c = 6.8165 (11) Å, α = β = γ = 90°, and two formula units…
Abstract In this study, epoxy nanocomposites containing 0.5, 1, 2, and 5% (m/m) of epoxycyclohexyl—POSS were prepared by mechanical mixture. The samples were characterized by gel content, thermogravimetric analysis (TGA), transmission electron microscopy, and scanning electron microscopy (SEM). TGA analysis was carrie…
In this study,we have shown the applicability of electrophoretic deposition ( EPD ) for shape‐forming in Ti 3 SiC 2 —a representative MAX phase; and viability of texture development thereof by application of a strong magnetic field (12 T). The dispersion characteristics of Ti 3 SiC 2 suspension were investigated in te…
Based on the phase-coexistence transport model, an expression for the temperature coefficient of resistivity (TCR) behavior in doped manganites is proposed. The derived maximum TCR value (TCRmax), being related to polaron binding energy, transition temperature, and disorder in doped manganites, describes the observed…
New experiments on an organic ferroelectric verify that its electric polarization is driven primarily by an electron shift, rather than the ion shift that characterizes most other ferroelectrics.
Doping epitaxial graphene on SiC(0001) using nitrogen plasma leads to N-vacancy complexes. Based on the calculated energetics by density functional theory and comparison with scanning tunneling microscopy observations, the most probable configuration is determined to be a nonmagnetic complex consisting of substitution…
A noble strategy: A photocatalytic strategy toward organic–inorganic ternary nanocomposites of Sn-porphyrin (SnP), angular Au nanoparticles (AuNPs), and reduced graphene oxide (RGO) using SnP as an effective photocatalyst for the reduction of both GO and AuIII under visible-light irradiation. The synergistic effect of…
We report on the facile fabrication of efficient porous alumina membrane-based SERS substrates that avoid the cumbersome stages of chemical surface modification of the pores and premixing/infiltration of nanoparticles with analytes. The design relies on higher light transmission through the SERS substrates by widening…
We demonstrate the use of chemical-vapor-deposited (CVD) graphene as an effective indium-tin-oxide (ITO) electrode surface modifier to engineer the organic donor-acceptor heterojunction interface properties in an inverted organic solar cell device configuration. As revealed by in situ near-edge X-ray adsorption fine s…
Abstract 1, 2, 3, 5, and 7.5 wt% MWCNTs are incorporated into PS in a twin‐screw extruder at varying speeds, throughputs and extruder barrel temperatures. Increased SME at enhanced processing speeds seems to have the single largest effect in enhancing dispersion. A relative evaluation of PS/MWCNT interactions indicate…
Abstract Conventional melt transesterification successfully produced high‐molecular‐weight segmented copolyesters. A rigid, high‐ T g polyester precursor containing the cycloaliphatic monomers, 2,2,4,4‐tetramethyl‐1,3‐cyclobutanediol, and dimethyl‐1,4‐cyclohexane dicarboxylate allowed molecular weight control and hydr…
n-ZnO/HfO2/p-GaN based heterojunction light emitting diodes were fabricated using a radio frequency magnetron sputtering system. The electroluminescence measurements revealed that dominant violet emissions centered at around 415 nm were emitted and improved performances were observed for the devices with the HfO2 inte…
Strongly size controlled silicon nanocrystals in silicon oxynitride matrix were prepared using plasma enhanced chemical vapor deposition following the superlattice approach. Doping was achieved by adding diluted phosphine as a precursor gas. Phosphorus quantification was done by secondary ion mass spectrometry. A mode…