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。
Koordinierte Wassermoleküle induzieren die Aggregation und Selbstorganisation einer lyotropen flüssigkristallinen Phase, die aus nichtionischen Tensiden CnH2n+1(CH2CH2O)mOH und Übergangsmetall-Wasser-Komplexen ([Ni(H2O)6](NO3)2, [Co(H2O)6](NO3)2, [Zn(H2O)6](NO3)2, [Cd(H2O)4](NO3)2 und [Co(H2O)6]Cl2) gebildet wird, sod…
The thermal conductance of mechanically suspended nanostructures has recently received much attention, in part due to the recent prediction and observation of the quantum limit for thermal conductance, which is observed in long, thin insulating beams at very low temperatures [D. E. Angelescu, M. C. Cross, and M. L. Ro…
The influence of a highly anisotropic layered silicate (organically modified montmorillonite) in directing the mesoscopic self-assembly of a block copolymer blend is studied as a model for the development and tailoring of templated inorganic–organic hybrid materials. The potential for nanometer thick layers to induce…
Uniformly dispersed zinc ferrite nanoparticles were successfully synthesized in a silica matrix with both the magnetic properties and optical transparency designed in the visible wavelength region. The phases and morphologies of these zinc ferrite particles were examined using x-ray diffraction, Raman spectroscopy and…
Brillouin light scattering, Raman light scattering and x-ray diffraction were used to investigate the elastic and microstructural properties of polycrystalline and smooth fine-grained diamond films of varying diamond quality. They were deposited on a titanium alloy by a two-step microwave plasma-assisted chemical vapo…
Decay rates and related transport coefficients of hydrodynamic disturbances in the isothermal dissipative particle dynamics (DPD) fluid depend strongly on how the probing wave length (in simulations: sizes of colloidal particles, polymers, pores, etc.) compares to the dynamic correlation length and to the range of the…
Chemical and thermal reduction of copper oxide thin films (∼20 Å) has been studied with x-ray photoelectron spectroscopy (XPS) and temperature programmed desorption (TPD) for application in microelectronic device interconnects. XPS showed that copper (I) oxide (Cu2O) and copper (II) oxide (CuO) were reduced to copper…
Ferroelectric twin-domain structures in epitaxial Pb(Zr, Ti)O3 (PZT) thin films grown on various single-crystal substrates such as MgO(001), KTaO3(001), and SrTiO3(001) were investigated by two-dimensional reciprocal space mapping using synchrotron x-ray diffraction. Each system showed a characteristic domain structur…
New analogues of calix[4]arenetetrasulfonate (1) were prepared, in which the methylene bridges are replaced by S (2) and SO2 (3). The complexation ability of these calixarene ligands 1–3 toward Tb3+ ion and luminescence properties of the resulting complexes were examined. All the ligands formed complexes with lanthani…
Co-doped ZnO(Zn1−xCoxO) and Co, Al codoped ZnO(Zn1−xCoxO:Al) films were grown on c-plane sapphire (0001) substrates by pulsed laser deposition using a KrF excimer laser. In order to enhance homogeneous substitution of Co2+ for Zn2+ in the ZnO film, an alternating deposition (AD) method was employed for doping. ZnO fil…
First-principles total energy calculations are performed to study the phase stability of BN and C at low temperature. These are done using density functional theory (DFT) within the local density approximation (LDA) and the generalized gradient approximation (GGA). We find that for both materials LDA calculations pred…
In this work we report on the complex permittivity spectra and electrical conductivity of both as-fabricated and graphitized multiwall carbon nanotubes (MWNTs). The high-temperature annealing removes the Fe3C catalyst particles present in the as-fabricated material, enabling the intrinsic MWNT properties to be measure…
Oligoarylamides whose backbones are rigidified by intramolecular hydrogen bonds (H-bonds) are found to adopt well-defined conformations in both solution and solid state. Depending on the length of their backbones, these folding oligoamides are crescents, broken macrocycles, or helices. A large (approximately 10 A) int…
Density functional theories such as the Poniewierski–Stecki theory relate the elastic properties of nematic liquid crystals with their local liquid structure, i.e., with the direct correlation function (DCF) of the particles. We propose a way to determine the DCF in the nematic state from simulations without any appro…
The structural characteristics of the perovskite- based ferroelectric Pb(Zn1/3Nb2/3)O3-9%PbTiO3 at the morphotropic phase boundary (MPB) region (x≃0.09) have been analyzed. The analysis is based on the symmetry adapted free energy functions under the assumption that the total polarization and the unit cell volume are…
We show that dislocations should be the main source of spin tunneling in ${\mathrm{Mn}}_{12}$ crystals. Long range strains caused by dislocations produce broad distribution of relaxation times that has been seen in many experiments. When the external magnetic field is applied along the $c$ axis of the crystal, local r…
We demonstrate electrical electron spin injection via interband tunneling in ferromagnetic/nonmagnetic semiconductor Esaki diodes. An interband tunnel junction between ferromagnetic p+-(Ga,Mn)As and nonmagnetic n+-GaAs under reverse-bias allows spin-polarized tunneling of electrons from the valence band of (Ga,Mn)As t…
Seit den ersten Berichten über Übergangsmetallkomplexe mit Pinzetten-Liganden in den späten siebziger Jahren haben diese Systeme wegen der ungewöhnlichen Eigenschaften, die das Metallzentrum durch den Pinzetten-Liganden erhält, zunehmendes Interesse hervorgerufen. Typischerweise enthält ein solcher Ligand einen anioni…
Ferroelectric properties along the a(b) axis and c axis in single crystals of various bismuth layer-structured ferroelectrics (BLSFs) were investigated. By measuring saturated P-E hysteresis curves of BLSFs, values of the saturated remanent polarization and the coercive electric field were found to be related to the C…
Some methyl 4,6-O-benzylidene monosaccharides can act as strong low molecular weight gelators for various organic solvents. As they are accessible in a variety of homologues, each with a unique molecular architecture, they can be used for systematic studies of gelation phenomena. Structural details of their hydrogen-b…