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。
For a class of frustrated spin lattices including e.g. the 1D sawtooth chain, the 2D kagomé and checkerboard, as well as the 3D pyrochlore lattices we construct exact product eigenstates consisting of several independent, localized one-magnon states in a ferromagnetic background. Important geometrical elements of the…
This contribution reviews the area of polymorph selection during solution crystallization using known and predicted structures. In particular, an overview of what has been learned about the relationship between structure and kinetics and of the interplay between thermodynamics and kinetics is presented. This review ad…
We synthesized novel l -lysine-based compounds that were classified into three groups, urea−urea types ( 1 − 3 ), amide−urea types ( 4 − 6 ), and amide−amide type ( 7 ), and examined the effects of hydrogen bonding and van der Waals interactions on the organogelation behavior. Among these compounds, gelator 5 has the…
Using the TDLDA method, we investigate how the polarizability of the d electrons of the gold atoms influences the electronic and optical properties of metallic nanoshells. It is shown that a polarizable jellium background can introduce a significant shift of the plasmon resonances. The results of the study show that t…
By radio-frequency magnetron sputtering of bulk NaNbO3 pellet targets, films of NaNbO3 have been deposited on silicon substrates at different temperatures. Room-temperature deposited films have been annealed at different temperatures. Film samples have been characterized using an x-ray diffraction method. The room-tem…
Abstract In order to gain a greater insight in the nature of the D⇄Sb transannular interaction in dibenzostibocines, a series of D(C 6 H 4 S) 2 SbHal complexes (D = S; Hal = Cl 1 , Br 2 , I 3 ; D = O, Hal = Cl 4 ) has been synthesised. X‐ray structure determinations of complexes 1 − 4 reveal that the antimony atom is…
The structure of telechelic polymers is investigated using off-lattice Monte Carlo simulations and the polymer reference interaction site model (PRISM) integral equation theory. The polymer molecules are modeled as tangent-sphere freely-jointed chains where all beads interact via a hard sphere potential and end beads…
13 C and 2 H NMR relaxation time measurements were performed on four linear styrene−isoprene tetrablock copolymers (SISI) of overall molecular weight about 12 000 g/mol in order to characterize the segmental dynamics of both components. The two isoprene blocks are equal in length as are the two styrene blocks. A wide…
We report a new method for the nucleation and growth of diamonds by employing an electron-temperature control technique in CH 4 /H 2 radio frequency glow discharge plasma under a low gas pressure of 100 mTorr. The electron temperature in the plasma is controlled under constant gas pressure in a range from 0.5 to 2.5 e…
The physical processes accompanying an illumination of azobenzene chromophores embedded in a polymer matrix with spatially modulated and linearly polarized light are studied experimentally and simulated using the Monte Carlo (MC) method. The MC simulations base on a simple three-channel kinetic model of trans-cis type…
Abstract The rate of exchange of the two water molecules coordinated to a Gd III centre in neutral complexes with heptadentate DO3A derivatives is modulated by the basicity of the macrocyclic nitrogen bearing the pendant group: a lower basicity results in a slower water‐exchange rate. (© Wiley‐VCH Verlag GmbH & Co…
Using first-principles density functional calculations we showed that quantum structures can be generated on a single carbon nanotube by modulating the adsorption of hydrogen atoms. The band gap of the hydrogen-free zone of the tube widens in the adjacent hydrogen covered zone. The sudden variation of the band gap lea…
The thermoelectric power, electrical conductivity, crystal structure, and Raman active phonon modes of the semiconductor β-K2Bi8Se13 have been studied under pressure. There is a large increase in the electrical conductivity in the pressure range 0–1 GPa and a sharp maximum in the magnitude of the thermoelectric power…
The domain structure of epitaxial (001) Bi4Ti3O12 thin films grown on (001) SrTiO3 substrates by reactive molecular beam epitaxy was studied using transmission electron microscopy. It was found that the Bi4Ti3O12 thin films contain randomly distributed rotation domains of two different types, which are related by a 90…
We have studied, by small-angle magnetic neutron scattering, the evolution induced by the application of a magnetic field on the coexistence of ferromagnetism and antiferromagnetism in a crystal of ${\mathrm{Pr}}_{0.67}{\mathrm{Ca}}_{0.33}{\mathrm{MnO}}_{3}.$ The results are compared to magnetic measurements, which pr…
Results of broadband dielectric studies in glass-forming liquid crystalline chiral isopentylcyanobiphenyl (5(*)CB) are presented. Tests conducted as a function of temperature and pressure revealed the coexistence of glassy and critical properties. The latter are associated with the isotropic-cholesteric phase transiti…
The on-site Coulomb energy ${(U}_{\mathrm{dd}})$ and crystal-field splitting $(10Dq)$ of doped Mott-insulator ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{TiO}}_{3}$ have been estimated using resonant soft-x-ray emission spectroscopy (SXES). The Raman scattering of the ${e}_{g}$- and ${t}_{2g}$-resonant…
Abstract Lanthanide complexes of 2,6‐dihydroxybenzoic acid (2,6‐Hdhb), namely [ n Bu 4 N] 2 [Ln(2,6‐dhb) 5 (H 2 O) 2 ] [Ln = Sm ( 1 ) and Tb ( 2 )], were synthesized and their crystal structures determined by single‐crystal X‐ray diffraction studies. The 2,6‐dhb − ligand coordinates to the lanthanide cations through t…
Electric-arc produced as-prepared single-walled carbon nanotube (AP-SWNT) films have been purified by a selective oxidation process. The purification is monitored by near-infrared (NIR) spectroscopy, which gives a quantitative estimate of relative purities. This technique also gives an estimate of the change in relati…
We present a theoretical study of a single bottle-brush molecule, which consists of multiarmed polymer stars grafted densely onto a stiff backbone. Mean-field approximation and a variational approach are used to calculate the dominant trajectories of the grafted chains, the shape of the molecule, and the segment densi…