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。
Substances such as the ``telephone number compound'' Sr14Cu24O41 are intrinsically hole-doped. The involved interplay of spin and charge dynamics is a challenge for theory. In this article we propose to describe hole-doped Heisenberg spin rings by means of complete numerical diagonalization of a Heisenberg Hamiltonian…
The strip projection method is the most important way to generate quasiperiodic patterns with predefined local structure. We have obtained a very efficient algorithm for this method which allows one to use it in superspaces of very high dimension. A version of this algorithm for two-dimensional clusters and an applica…
We develop a theory of the linear optical spectrum of excitons in quantum dot molecules, including the effect of exciton-phonon coupling beyond the Markov limit. The model reproduces the general trend of the zero-phonon line broadening as a function of interdot distance, that were recently measured. The unexpectedly b…
Electron spin resonance spectra of copper phthalocyanine doped with alkaline metals (AxCuPc) have been investigated. The temperature dependence of ESR spectra indicates the ferromagnetic behavior. The Curie-Weiss temperature varies from 30K to 115K depending on the stoichiometry x of samples. Some particles of polycry…
The spin-orbit split white line, synchrotron X-ray spectra at the respective Cu and Ba L2,3 and Ba M4,5 edges in YBa2Cu3O7 crystal, powders, films and derivatives are compared to those for standard BaBr2 and CuO powders. The white line absorption integrated intensity, I ratios: r3,2 = I(L3)/I(L2) and r5,4 = I(M5)/I(M4…
Disguise tactics: Peptide–polymer hybrid nanotubes are constructed in which self-assembled cyclic peptides govern the structure, and a synthetic polymer coating determines the surface chemistry. Formation of the latter is initiated in situ from preorganized peptide building blocks. The picture shows an AFM image of na…
There is considerable interest in hydrogen adsorption on carbon nanotubes and porous carbons as a method of storage for transport and related energy applications. This investigation has involved a systematic investigation of the role of functional groups and porous structure characteristics in determining the hydrogen…
We compute analytically and numerically the four-point correlation function that characterizes nontrivial cooperative dynamics in glassy systems within several models of glasses: elastoplastic deformations, mode-coupling theory (MCT), collectively rearranging regions (CRR's), diffusing defects, and kinetically constra…
The paper reports the study of the effect of Zr contents on the dielectric, ferroelectric, leakage current and fatigue properties of Ba (Zr x Ti1 − x ) O3 films. All these films exhibited high dielectric constant, which tends to be maximum for 5 at % (BZT5) Zr doped BaTiO3 film. The dielectric properties at the sub-sw…
This study has demonstrated that acetylshikonin (ACS), the isolated ingredient from Lithospermum canescens Lehm. roots, in a daily dose of 200 microg for 3 days, inhibited cutaneous angiogenesis induced by L-1 sarcoma cells in Balb/c mice.
Composites of palm fiber and polypropylene were compounded using a mixing equipment connected to an extruder. The composites were then injection molded into standard tensile specimens for mechanical characterization. The fracture morphology of the specimens was also analyzed by Scanning electron microscopy. It was obs…
It is demonstrated that Fe3+ in one solution can be reduced to Fe2+ by ascorbic acid in another solution when both aqueous solutions are separated by polyaniline membrane. This transmembrane redox process is possible due to electron/anion coupled counter transport through polyaniline membrane. It was demonstrated that…
The adsorption of ethene, propene, 1-butene, trans-2-butene, and isobutene on phosphotungstic acid has been characterized by density functional theory (DFT) calculations and microcalorimetric experiments. The DFT-calculated chemisorption energies to form the corresponding alkoxides for ethene, propene, 1-butene, trans…
Brownian dynamics simulations are used to study the adsorption of an isolated polyelectrolyte molecule onto an oppositely charged flat surface in the absence and the presence of an imposed shear flow. The polyelectrolyte is modeled as a freely jointed bead-rod chain where excluded volume interactions are incorporated…
ϵ‐Caprolactone was polymerized by ring‐opening polymerization (ROP), using thiophene methanol as the initiator and stannous octoate as the catalyst to yield poly(ϵ‐caprolactone) with a thiophene end group. Homopolymerization of thiophene functionalized poly (ϵ‐caprolactone) (PCL) was achieved by a constant current ele…
Organic nanotubes of various diameters were fabricated from the isomeric molecule dibenzoylmethane (DBM) by using an immersing technique with ordered porous alumina membrane as the template. The ratio of the enol isomers of DBM increased as the diameters of the nanotubes decreased. In addition, although almost no fluo…
The electric dipole interaction among adsorbate molecules may cause them to form regular nanopatterns. In a multilayer system, the self-organization of each layer is also influenced by the underlying layers. This Letter develops a phase field model to simulate the molecular patterning process. The study reveals self-a…
We investigate numerically with the aid of the Landau-de Gennes continuum theory the interaction between two spherical particles carrying the same topological charges +1 mediated by the elastic distortion of a nematic liquid crystal. We consider the case where an escaped nontopological ring disclination is situated be…
This letter describes a principle demonstration of an ultrafast optical switch operating at 1Tbit∕s using CdTe-quantum-dots-doped glasses. Using a three-beam pump and probe experiment, we showed that thermal effects are responsible for a baseline in the pump and probe graphs and the nonexistence of carrier accumulatio…
The effects of A-site cation disorder and size on metamagnetism of ABO3 type charge and orbital ordered Pr0.5Ca0.5MnO3 system have been studied by substituting Ba+2 for Ca+2 or La+3 for Pr+3. Substitution of 5% Ba+2 or 5% La+3 drastically reduces the critical magnetic field (Hc) for metamagnetism and induces successiv…