Materials Literature
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Using high-resolution electron microscopy, localized solid-state amorphization (SSA) was observed in a nanocrystalline (NC) Al solid solution (weight per cent 4.2 Cu, 0.3 Mn, the rest being Al) subjected to a surface mechanical attrition treatment. It was found that the deformation-induced SSA may occur at the grain b…
We study the effect of doping transition metals (TMs) into single-wall carbon nanotubes by using first-principles calculations. For metallic isolated (3,3) single-wall carbon nanotubes, doping of Mn, Fe and Co makes them semi-metallic, while Ni doping leads to semiconductors. For (3,3) nanotube bundles, a Co atom in t…
Synthetic polymer and biopolymer nanofibres can be fabricated through self-assembly, phase separation, electrospinning, and mechanical methods. These novel functional biocompatible polymers are very promising for a variety of future biomedical applications. There are many characteristics of nanofibres that would poten…
We investigated the thermal conductivity in Ge∕Si quantum dot superlattices both theoretically and experimentally. It is proposed that thermal conduction through the quantum dot superlattices can be described by the phonon-hopping model with the interface transparency obtained from the experiment. Thermal conductivity…
The fundamental nature of the nematic-nematic $(N\text{\ensuremath{-}}N)$ phase separation in binary mixtures of rigid hard rods is analyzed within the Onsager second-virial theory and the extension of Parsons and Lee which includes a treatment of the higher-body contributions. The particles of each component are mode…
In the present study we clarify phase diagrams related to silk fibroin processing into three-dimensional porous structures useful for biomaterials and for scaffolds in tissue engineering. All-aqueous and organic solvent (hexafluoroisopropanol) modes of processing are compared relative to solution concentration of silk…
We have performed time-resolved photoluminescence measurements on suspensions of silicon nanoparticles using near-infrared two-photon femtosecond excitation. Our results for 1 nm particles show wide bandwidth but indicate full conversion to directlike behavior, with a few nanosecond time characteristic, corresponding…
Cherenkov radiation by a nonrelativistic electron bunch that moves above an interface of a vacuum-left-handed material has been investigated theoretically. The electron density of the bunch is described by a Gauss distribution. Cherenkov radiation for the frequency range where the refractive index is negative is shown…
ZnO film is promising for high frequency surface acoustic wave device application when coupled with diamond. In order to get good performance and reduce insertion loss of the device, which demand a piezoelectric material possessing high electrical resistivity and piezoelectric constant d 33 , Cu-doped ZnO films have b…
The photophysical properties of five fluorescent pH probes derived from 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene with phenolic or naphtholic subunits at position 8 and with substituents having different electron driving forces at positions 3 and 5 have been investigated in several organic solvents, by means of absor…
Here we report a kind of diluted magnetic semiconductor (DMS) system, i.e., Fe-doped NiO. Monophase Ni1−xFexO (x=0–0.02) was synthesized by using a chemical coprecipitation method and post-thermal decomposition processing. Pure NiO without Fe doped is antiferromagnetic. The results demonstrated the samples with Fe dop…
We study the quantum forces that act between two nearby conductors due to electronic tunneling. We derive an expression for these forces by calculating the flux of momentum arising from the overlap of evanescent electronic fields. Our result is written in terms of the electronic reflection amplitudes of the conductors…
Taking into account stress fluctuations due to thermal noise, we study thermally activated irreversible crack growth in disordered media. The influence of material disorder on sub-critical growth of a single crack in two-dimensional brittle elastic material is described through the introduction of a rupture threshold…
We report measurements of the optical responses of a La2∕3Sr1∕3MnO3 (LSMO) sample at a wavelength of 533 nm in the 300–400 K range. At 335 K the temperature coefficient of the resistance of a 100-μm-wide, 300-μm-long LSMO line was 0.017K−1 and the normalized Hooge parameter was 9×10−30m3, which is among the lowest rep…
Photoinduced electron transfer is a widely applied method to convert photon energy into a useful (electro)chemical potential, both in nature and in artificial devices. There is a continuing effort to develop molecular systems in which the charge-transfer state, populated by photoinduced electron transfer, survives suf…
Inorganic nanoparticles with controlled size and shape seem especially technologically important due to the strong correlation between these parameters and their magnetic, electrical, and catalytic properties. Herein we demonstrate that uniform spinel cobalt oxide (Co 3 O 4 ) nanocubes can be successfully synthesized…
Four discrete MnIII/MnII tetra-nuclear complexes with double-cuboidal core were synthesized. dc magnetic measurements show that both Mn2+ - Mn3+ and Mn3+ - Mn3+ magnetic interactions are ferromagnetic in three samples leading to an S = 9 ground state for the Mn4 unit. Furthermore, these complexes are Single-Molecule M…
We present the structures of putative global potential energy minima for clusters bound by the Stockmayer (Lennard-Jones plus point dipole) potential. A rich variety of structures is revealed as the cluster size and dipole strength are varied. Most remarkable are groups of closed-loop structures with the topology of k…
In the present work we theoretically analyze the effect of the Fermi surface local geometry on quantum oscillations in the velocity of an acoustic wave travelling in metal across a strong magnetic field. We show that local flattenings of the Fermi surface could cause significant amplification of quantum oscillations.…
The dependence of superlattice thermal conductivity on period length is investigated by molecular dynamics simulation. For perfectly lattice matched superlattices, a minimum is observed when the period length is of the order of the effective phonon mean free path. As temperature decreases and interatomic potential str…