Materials Literature
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Interlayer exchange couplings were examined for Co2FeAl0.5Si0.5(CFAS)/Cr/CFAS trilayered films grown on MgO (001) single crystal and thermally oxidized Si substrates. The films were (001) epitaxial on MgO and (110) textured polycrystalline on SiO2. Strong exchange couplings were observed for the films with the 1.5 nm…
We report a versatile emulsion polymerization process in which solid nanoparticles are used as stabilizer, thereby replacing the role of surfactants, allowing for simple fabrication of armored nanocomposite polymer latexes. Use of a second conventional seeded emulsion polymerization step provides a straightforward rou…
On the basis of Monte Carlo simulations using the Potts model Hamiltonian, we investigate the complex temperature dependence of magnetization of ferromagnetic $\text{Ni-Mn-}X$ $(X=\text{In},\text{Sn},\text{Sb})$ Heusler alloys, in which part of the Mn atoms, which occupy the $X$ sites, interacts antiferromagnetically…
We study photon bunching phenomena associated with biexciton-exciton cascade in single GaAs self-assembled quantum dots. Experiments carried out with a pulsed excitation source show that significant bunching is only detectable at very low excitation, where the typical intensity of photon streams is less than the half…
We report extensive measurements of quantum oscillations in the normal state of the Fe-based superconductor LaFePO, (T(c) approximately 6 K) using low temperature torque magnetometry and transport in high static magnetic fields (45 T). We find that the Fermi surface is in broad agreement with the band-structure calcul…
The inelastic scattering of neutrons by nanoparticles due to acoustic vibrational modes (energy below 10 meV) confined in nanoparticles is calculated using the Zemach-Glauber formalism. Such vibrational modes are commonly observed by light scattering techniques (Brillouin or low-frequency Raman scattering). We also re…
Recent scanning tunneling spectroscopy experiments on graphene reported an unexpected gap of about +/-60 meV around the Fermi level [V. W. Brar, Appl. Phys. Lett. 91, 122102 (2007); 10.1063/1.2771084Y. Zhang, Nature Phys. 4, 627 (2008)10.1038/nphys1022]. Here we give a theoretical investigation explaining the experime…
The interplay of electron-phonon (el-ph) and electron-electron (el-el) interactions in epitaxial graphene is studied by directly probing its electronic structure. We found a strong coupling of electrons to the soft part of the ${A}_{1g}$ phonon evident by a kink at $150\ifmmode\pm\else\textpm\fi{}15\text{ }\text{meV}$…
We study the triangular antiferromagnet Cu3 in external electric fields, using symmetry group arguments and a Hubbard model approach. We identify a spin-electric coupling caused by an interplay between spin exchange, spin-orbit interaction, and the chirality of the underlying spin texture of the molecular magnet. This…
We present a joint theoretical and experimental investigation of the absorption spectra of silver clusters Ag(n) (4<or=n<or=22). The experimental spectra of clusters isolated in an Ar matrix are compared with the calculated ones in the framework of the time-dependent density functional theory. The analysis of the mole…
This review article describes the recent developments of natural fiber reinforced polypropylene (PP) composites. Natural fibers are low-cost, recyclable, and eco-friendly materials. Due to eco-friendly and bio-degradability characteristics of these natural fibers, they are considered as strong candidates to replace th…
Heterogeneous catalysis is used broadly today in industry. Catalysts crack crude oils into the fuels we use daily. They are used in catalytic converters to minimize dangerous gas emissions from internal combustion engines. Many chemicals are made in large quantities using heterogeneous catalysts. Et...
An efficient one-pot procedure which converts 5,15-disubstituted porphyrins into their corresponding meso acyl-, alkoxycarbonyl-, and carbamoyl-substituted meso-formylporphyrins has been developed, where the procedure involves a sequential S(N)Ar reaction of porphyrins with PyMe(2)SiCH(2)Li, followed by acylation or r…
A kind of interesting urchin-like selenium nanostructure consisting of Se nanorods with a diameter of ∼100 nm and a length of 4−5 μm was synthesized based on a facile dismutation reaction in a buffer system at ambient conditions. In the synthesis process, cetyltrimethylammonium bromide (CTAB) was used as a shape-direc…
In order to study the micromechanism of silver migration that influences the dielectric properties and reliability of Zn 0.95 Mg 0.05 TiO 3 +0.25TiO 2 (ZMT″) with 1 wt% 3ZnO–B 2 O 3 multilayer ceramic capacitors (MLCCs), various silver (Ag)–palladium (Pd) ratios of conductors were used as inner electrodes. It was foun…
A novel approach was adopted to incur bending fracture in carbon nanotubes (CNTs). Expanded graphite (EG) was made by intercalating and exfoliating natural graphite flakes. The EG was deposited with nickel particles, from which CNTs were grown by chemical vapor deposition. The CNTs were tip-grown, and their roots were…
Abstract Dynamic mechanical analysis and dielectric relaxation spectra of exfoliated nano graphite reinforced flouroelastomer composites were used to study their relaxation behavior as a function of temperature (−80°C to +40°C) and frequency (0.01 to 10 5 Hz). The effect of filler loadings on glass transition temperat…
A covalent dyad composed of a free-base porphyrin and a perylene diimide (1) was synthesised and characterised by NMR, HRMS, UV/Vis and fluorometric methods. UV/Vis spectrophotometric analysis indicated a moderate coupling between the components in the ground state. Fluorescence spectroscopy revealed that the emissive…
Abstract A new and promising method for the diversification of microbial polyesters based on chemical modifications is introduced. Poly(3‐hydroxy alkanoate)‐ g ‐(poly(tetrahydrofuran)‐ b ‐poly(methyl methacrylate)) (PHA‐ g ‐(PTHF‐ b ‐PMMA)) multigraft copolymers were synthesized by the combination of cationic and free…
A novel surface modification technique was developed to provide a copper nickel alloy (M) surface with bactericidal and anticorrosion properties for inhibiting biocorrosion. 4-(chloromethyl)-phenyl tricholorosilane (CTS) was first coupled to the hydroxylated alloy surface to form a compact silane layer, as well as to…