Nikos Tagmatarchis、Vasilios Georgakilas、Maurizio Prato 等 4 位作者2002-08-12Chemical Communications
Electrophilic addition of chloroform to SWNTs followed by hydrolysis resulted in the addition of hydroxy groups to the surface of the nanotubes; further esterification with propionyl chloride led to the corresponding ester derivatives, which allowed us to identify their structure, also providing better solubility in o…
Carbon Nanotubes in CompositesGraphene research and applicationsFullerene Chemistry and Applications
W. H. Wang、Zhonghao Liu、Jin Zhang 等 9 位作者2002-08-12Physical review. B, Condensed matter
We have found a perfect thermoelastic intermartensitic transformation between the seven-layer modulation $(7M)$ and the five-layer modulation $(5M)$ martensites in an unstressed ${\mathrm{Ni}}_{52}{\mathrm{Mn}}_{24}{\mathrm{Ga}}_{24}$ single crystal. In particular, we found that the intermartensitic transformation is…
Magnetic Properties and ApplicationsCreativity in Education and NeuroscienceShape Memory Alloy Transformations
J. Goodberlet、Hamide Kavak2002-08-12Applied Physics Letters
Sub-50 nm lines, holes, and posts have been patterned photolithographically using near-field embedded-amplitude masks and an exposing wavelength of 220 nm generated by an arc-lamp source. Interference in the optical near field is utilized to produce the fine patterns. In some cases, the feature sizes on the mask are m…
Optical Coatings and GratingsNear-Field Optical MicroscopyNanofabrication and Lithography Techniques
S. M. Yusuf、M. Sahana、K. Dörr 等 5 位作者2002-08-12Physical review. B, Condensed matter
The effect of Ga substitution for Mn in the ferromagnetic manganite ${\mathrm{La}}_{0.67}{\mathrm{Ca}}_{0.33}{\mathrm{MnO}}_{3}$ has been studied by preparing a series of ${\mathrm{La}}_{0.67}{\mathrm{Ca}}_{0.33}{\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Ga}}_{x}{\mathrm{O}}_{3}$ $(x=0,0.10,0.25).$ Magnetic properties h…
Rare-earth and actinide compoundsMagnetic and transport properties of perovskites and related materialsAdvanced Condensed Matter Physics
Takahiro Matsumoto、Hiroyuki Kato、Kazuhiro Miyamoto 等 6 位作者2002-08-12Applied Physics Letters
Photoluminescence (PL) and time-resolved PL spectra of zinc oxide (ZnO) films were investigated as a function of the grain size of the microcrystals. Correlation was found between the grain size and the optical properties—in the bound exciton states, both the PL intensity and PL decay time increased with increasing th…
Ga2O3 and related materialsGas Sensing Nanomaterials and SensorsZnO doping and properties
Shi X. Dou、Joseph Horvat、Saeid Soltanian 等 8 位作者2002-08-12arXiv
The nano-SiC doped MgB2/Fe wires were fabricated using a powder-in-tube method and an in-situ reaction process. The depression of Tc with increasing SiC doping level remained rather small due to the counterbalanced effect of Si and C co-doping. The high level SiC co-doping allowed creation of the intra-grain defects a…
Materials ScienceSuperconductivity
Shaun C. Hendy2002-08-12Applied Physics Letters
Transparent glass ceramic materials, with microstructures comprised of dispersed nanocrystallites in a residual glass matrix, offer the prospect of nonlinear optical properties. However, good transparency requires low optical scattering and low atomic absorption. The attenuation of light due to scattering (turbidity)…
Random lasers and scattering mediaGlass properties and applicationsMaterial Science and Thermodynamics
S. O. Demokritov、C. Bayer、S. Poppe 等 9 位作者2002-08-12arXiv
The manipulation of the antiferromagnetic interlayer coupling in the epitaxial Fe/Cr/Fe(001) trilayer system by moderate 5 keV He ion beam irradiation has been investigated experimentally. It is shown that even for irradiation with very low fluences (10^14 ions/cm^2) a drastic change in strength of the coupling appear…
Materials Science
P. Nordblad、A. Broddefalk、R. Mathieu 等 6 位作者2002-08-12arXiv
Some physical properties of bcc Fe/V and Fe/Co (001) superlattices are reviewed. The dependence of the magnetic anisotropy on the in-plane strain introduced by the lattice mismatch between Fe and V is measured and compared to a theoretical derivation. The dependence of the magnetic anisotropy (and saturation magnetisa…
Materials Science
J. Cviklinski、A. R. Tajbakhsh、E. M. Terentjev2002-08-12arXiv
The macroscopic shape of liquid crystalline elastomers strongly depends on the order parameter of the mesogenic groups. This order can be manipulated if photoisomerisable groups, e.g. containing N=N bonds, are introduced into the material. We have explored the large photo-mechanical response of such an azobenzene-cont…
Materials ScienceSoft Condensed Matter
Eugene M. Chudnovsky、X Martínez-Hidalgo2002-08-12Physical review. B, Condensed matter
We present a rigorous solution of problems of tunneling with dissipation and decoherence for a spin of an atom or a molecule in an isotropic solid matrix. Our approach is based upon switching to a rotating coordinate system coupled to the local crystal field. We show that the spin of a molecule can be used in a qubit…
Electron Spin Resonance StudiesMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Zhi Yu、Chen Ang、Ruyan Guo 等 4 位作者2002-08-12Applied Physics Letters
The effect of dc electric field (E) on the dielectric properties of Ba(Ti0.7Zr0.3)O3 ceramics with an obvious ferroelectric-relaxor behavior (Tm∼229 K, 10 kHz) is reported. The dielectric constant is greatly suppressed and a low loss is obtained under dc electric fields (⩽40 kV/cm). The low loss (tan δ∼0.002) and high…
Multiferroics and related materialsFerroelectric and Piezoelectric MaterialsMicrowave Dielectric Ceramics Synthesis
G. Kotliar、S. Y. Savrasov2002-08-12arXiv
We review the basic ideas of the dynamical mean field theory (DMFT) and some of the insights into the electronic structure of strongly correlated electrons obtained by this method in the context of model Hamiltonians. We then discuss the perspectives for carrying out more realistic DMFT studies of strongly correlated…
Strongly Correlated ElectronsMaterials Science
Takehide Miyazaki、Hidefumi Hiura、Toshihiko Kanayama2002-08-12arXiv
We present a density-functional (DF) study of structures of Si cage clusters that encapsulate metal atoms. As a prototypical example, the case of WSi$_{n}$ clusters is shown. To obtain the low-energy clusters in efficient and unbiased ways, genetic-like geometry updates have been performed for generating inputs for su…
Materials Science
S. Ingvarsson、L. Ritchie、X. Y. Liu 等 7 位作者2002-08-12arXiv
We observe a strong correlation between magnetization relaxation and electrical resistivity in thin Permalloy (Ni$_{81}$Fe$_{19}$, ``Py'') films. Electron scattering rates in the films were affected by varying film thickness and deposition conditions. This shows that the magnetization relaxation mechanism is analogous…
Mesoscale and Nanoscale PhysicsMaterials Science
Brigitte Vigolo、Philippe Poulin、Marcel Lucas 等 5 位作者2002-08-12Applied Physics Letters
This letter describes a method to improve the alignment of single-wall carbon nanotubes in macroscopic fibers produced by a simple spinning process. By contrast to classical composite fibers, where the nanotubes are embedded in a polymeric matrix, they consist of an interconnected network of polymers and nanotubes. Th…
Graphene research and applicationsFiber-reinforced polymer compositesCarbon Nanotubes in Composites
Anton V. Malko、Alexander Mikhailovsky、Melissa A. Petruska 等 7 位作者2002-08-12Applied Physics Letters
We study different emission regimes in close-packed films of chemically synthesized CdSe nanoparticles [nanocrystal quantum dots (NQDs)]. We observe that the NQD photoluminescence is dominated by excitons and biexcitons, respectively, before and after the threshold for stimulated emission. Furthermore, we demonstrate…
Chalcogenide Semiconductor Thin FilmsQuantum Dots Synthesis And PropertiesPhotonic Crystals and Applications
Q. Wei、Di Jia、K.T. Ramesh 等 4 位作者2002-08-12OpenAlex
Shear band development in consolidated nanocrystalline and ultrafine-grained Fe has been monitored as a function of overall strain from the onset of plastic deformation. The deformation mechanisms of the grains inside the shear bands, the origin of the inhomogeneous deformation, and the propensity for shear localizati…
Microstructure and Mechanical Properties of SteelsMicrostructure and mechanical propertiesHigh-Velocity Impact and Material Behavior
Jih‐Jen Wu、Sai‐Chang Liu、Chien-Ting Wu 等 5 位作者2002-08-12OpenAlex
The heterostructures of Zn–ZnO coaxial nanocables and ZnO nanotubes with an average diameter of 30 nm have been synthesized by simple pyrolysis of zinc acetylacetonate. High-resolution transmission electron microscopy analyses reveal that the Zn core and the ZnO sheath of the nanocables have an epitaxial relationship…
Ga2O3 and related materialsGas Sensing Nanomaterials and SensorsZnO doping and properties
Eric R. Weeks、David A. Weitz2002-08-12OpenAlex
We use confocal microscopy to study particle motion in colloidal systems. Near the glass transition, motion is inhibited, as particles spend time trapped in transient "cages" formed by neighboring particles. We measure the cage sizes and lifetimes, which, respectively, shrink and grow as the glass transition approache…
Photochemistry and Electron Transfer StudiesSurfactants and Colloidal SystemsMaterial Dynamics and Properties