Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
We report the three-dimensional (3D) momentum-resolved soft x-ray photoemission spectroscopy of the Fermi liquid ${\text{LaNiO}}_{3}$. The out-of-plane and in-plane cuts of the 3D electron- and hole-Fermi surfaces (FSs) are observed by energy- and angle-dependent photoemission measurements. The energy bands forming th…
The base‐metal‐electrode multilayer ceramic capacitors (BME MLCCs) for future application require much thinner dielectric layers (<1 μm). Therefore, the grain size and uniformity of BME MLCC powders should be effectively controlled. In this paper, the nanosized BME MLCC powders were prepared by chemical coating met…
Abstract Layered double hydroxides based on the structure (Mg 6 Al 2 (OH) 16 CO 3 ·4H 2 O) were synthesized by urea hydrolysis method and characterized by XRD, FTIR, SEM, and EDS. The results revealed that pH played a crucial role in the Mg‐Al hydrotalcite precipitation by controlling [urea]/[NO ] molar ratio in react…
In this Letter, we present a novel strategy to control the thermoelectric properties of individual PbSe nanowires. Using a field-effect gated device, we were able to tune the Seebeck coefficient of single PbSe nanowires from 64 to 193 microV x K(-1). This direct electrical field control of sigma and S suggests a power…
Abstract Regelbare Freisetzung : Wenn Avidin als „Deckel“ an biotinyliertem kolloidalem mesoporösem Silica angebracht wird, können seine vier Untereinheiten einzeln an Biotin‐Gruppierungen an der Oberfläche binden (siehe Bild). Das erhaltene Material ist ein vielversprechender Kandidat für die Entwicklung intelligente…
Dendrimer chemistry : concepts, syntheses, properties, applications , Dendrimer chemistry : concepts, syntheses, properties, applications , کتابخانه مرکزی دانشگاه علوم پزشکی تهران
Nb-doped anatase TiO2 thin films grown by pulsed-laser deposition show Kondo scattering in elctronic-transport measurements, providing evidence for the formation of magnetic moments. The origin of magnetism is attributed to cation (Ti) vacancies, confirmed by X-ray absorption spectroscopy and first-principle calculati…
Thermosenstive liposomes coated with gold form plasmon-resonant shells with optical resonances tunable in the near-infrared range. When exposed to laser light, these liposomes release their content in a spectrally-dependent manner. Spectrally addressable release may find applications in the delivery of diagnostic and…
Solid solution formation is a common and effective approach to reduce the lattice thermal conductivity for thermoelectric materials because of additional phonon scattering by point defects due to mass and strain fluctuations. This scattering is maximal for vacancies. In this paper we present an example of the strong e…
We investigated effects of hydrogen passivation of edges of armchair graphene nanoribbons (AGNRs) on their electronic properties using first-principles method. The calculated band gaps of the AGNRs vary continually over a range of 1.6 eV as a function of a percentage of sp3-like bonds at the edges. This provides a sim…
Hybrid materials with aligned carbon nanotubes intercalating naturally layered compounds (see upper figures) are fabricated using general metal-ion intercalation and in situ growth. As indicated by SEM images (lower figures), they exhibit periodic and hierarchical structures. The ability to control their composition r…
We propose a microscopic theory of light-induced deformation of side-chain azobenzene polymers taking into account the internal structure of polymer chains. Our theory is based on the fact that interaction of chromophores with the polarized light leads to the orientation anisotropy of azobenzene macromolecules which i…
In the context of a classical example of glass formation in three dimensions, we exemplify how to construct a statistical-mechanical theory of the glass transition. At the heart of the approach is a simple criterion for verifying a proper choice of upscaled quasispecies that allow the construction of a theory with a f…
Activated carbons especially used for gaseous adsorption were prepared from Chinesefir sawdust by zinc chloride activation under vacuum condition. The micropore structure, adsorption properties, and surface morphology of activated carbons obtained under atmosphere and vacuum were investigated. The prepared activated c…
A-site ordered manganites LnBaMn1.96Fe0.04O5 and LnBaMn1.96Fe0.04O6 are investigated by x-ray full-profile diffraction and Moessbauer spectroscopy. Powder samples were oriented with preferred orientation of platy crystallites in the plane of sample surface. March-Dollase function of preferred orientation was employed…
The spin relaxation time $T_{1}$ in zinc blende GaN quantum dot is investigated for different magnetic field, well width and quantum dot diameter. The spin relaxation caused by the two most important spin relaxation mechanisms in zinc blende semiconductor quantum dots, {i.e.} the electron-phonon scattering in conjunct…
This is a representation of the first Raman and IR / FIR spectra for orthorhombic copper polysilicate, CuSiO3, measured at room temperature on polycrystalline samples and a comparison of the optical phonons with those observed for the spin-Peierls compound CuGeO3. CuSiO3 represents a further example of a quasi-one-dim…
The electrical resistivities of Fe-Co alloys owing to random alloy disorder are calculated using the Kubo-Greenwood formula. The obtained electrical esistivities agree well with experimental data quantitatively at low temperature. The spin-polarization of Fe50Co50 estimated from the conductivity (86%) has opposite sig…
The present paper is a review of the phenomena related to non-equilibrium electron relaxation in bulk and nano-scale metallic samples. The workable Two-Temperature Model (TTM) based on Boltzmann-Bloch-Peierls (BBP) kinetic equation has been applied to study the ultra-fast(femto-second) electronic relaxation in various…
We extend the Berry-phase concept of polarization to insulators having a non-zero value of the Chern invariant. The generalization to such Chern insulators requires special care because of the partial occupation of chiral edge states. We show how the integrated bulk current arising from an adiabatic evolution can be r…