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。
The morphology and crystallization behavior of freeze-extracted isotactic polystyrene ( i PS) derived from concentrated solutions in solvents of middle molecular size were characterized by the wide-angle X-ray diffraction, infrared spectroscopy, and differential scanning calorimetry. It was found that the freeze-extra…
An intimate historical and conceptual association exists between crystals and chirality. Yet the relationships between crystal symmetry and crystal morphology are not fully understood. In biological environments, molecular recognition between biological macromolecules and crystal surfaces can affect crystal morphologi…
Confusion but no doubt: Two types of PtII dimer complexes of N-confused porphyrin (depicted) were synthesized and the structures were unequivocally elucidated by X-ray crystal analyses. Both complexes contain a metallocycle that binds to a Pt center by an outer-nitrogen atom of the confused porphyrin, and by an ortho-…
The anomalous Hall effect due to the spin chirality order and fluctuation is studied theoretically in a Kondo lattice model without the relativistic spin-orbit interaction. Even without the correlations of the localized spins, ${\ensuremath{\sigma}}_{xy}$ can emerge depending on the lattice structure and the spin anis…
Fours for thought: The title compound was prepared by condensation of the preformed unit {Mo2O2S2}2+ as a linker on to the trivacant anion [α-P2W15O5]12−. The self-assembled structure exhibits a modular arrangement (see structure). 31P and 183W NMR spectroscopy revealed that the structure of the supramolecular tetra-u…
This is the first comprehensive study on the kinetic modeling of adiabatic decomposition of di- tert -butyl peroxide (DTBP) and its solvent mixtures. The adiabatic thermal decomposition of DTBP and its solvent mixtures was examined using an accelerating rate calorimeter under varying thermal inertia. The decomposition…
4253-4255
An ordered hexagonal mesoporous nickel oxide was prepared for the first time using sodium dodecyl sulfate as the surfactant and urea as the hydrolyzing agent. The resulting oxide showed mesoporous structure with pore size ranging from 4 to 7 nm. Calcination at different temperatures was carried out, and the mesoporosi…
[reaction: see text] Regioselectivity of the oxidative coupling of 5,10,15-triarylporphyrin metal complexes with DDQ-Sc(OTf)(3) was dependent on the central metal and meso-aryl substituent. Oxo-quinoidal porphyrin was obtained from Ni(II) porphyrin under the same conditions.
Crystal conversion of beta-chitin to alpha-chitin by aq. NaOH treatment was studied for a highly crystalline beta-chitin sample from diatom spine. The minimum NaOH concentration to cause swelling was between 25% and 30% w/w. The alkali-swollen material was poorly crystalline and was regenerated as alpha-chitin on wash…
This paper describes the preparation of colloidal dispersions of water-insoluble organic materials by a “solvent-shifting” procedure, in which a concentrated solution of an organic solute in a water-miscible organic solvent is dispersed into a large volume of aqueous (nonsolvent) bulk solution containing colloidal sta…
Filling the gaps: A low-temperature solution route was employed to successfully prepare multiwalled TiS2 nanotubes with open-ended tips (see HRTEM image). The as-prepared nanotubes could be intercalated with lithium atoms by treating a solution of the TiS2 nanotubes with nBuLi. The resulting homogeneous intercalated p…
The preparation of poly( N -isopropylacrylamide)-monolayer-protected clusters (PNIPAM-MPC) of gold nanoparticles was carried out in a homogeneous phase using three methods, in which three types of PNIPAM ligands were employed. The first type was comprised of PNIPAMs with narrow molar mass distributions, synthesized by…
Single walled carbon nanotubes (SWNTs) have been coated with silica by the addition of a silica/H 2 SiF 6 solution to a surfactant-stabilized solution of SWNTs. The thickness of the coating is controlled by reaction time, while the coating of individual SWNTs versus small ropes is controlled by the choice of surfactan…
I analyze the Nonlocal Conserved Kardar-Parisi-Zhang (NCKPZ) equation with spatially correlated noise. This equation is also known as the Nonlocal Molecular Beam Epitaxy (NMBE) equation andv was originally suggested to study the effect of the long-range nature of interactions coupled with spatially correlated noise on…
We study the effect of spatial dispersion of crystal modes on optical properties such as the reflectivity $R$. As an example for isotropic media, we investigate the simplest model for phonons in ionic crystals and compare with previous results for highly anisotropic plasmons, which are now understood from a more gener…
We have used a tight-binding model that is fit to first-principles electronic-structure calculations for titanium to calculate quasi-harmonic phonons and the Gibbs free energy of the hexagonal close-packed (hcp) and omega crystal structures. We show that the true zero-temperature ground-state is the omega structure, a…
The complex band structure of an isolated polyethylene chain is calculated within Density Functional Theory (DFT). A plane wave basis and ultrasoft pseudopotentials are used. The results are compared with those obtained via a local basis set. We obtain a gap between the highest occupied molecular orbilar (HOMO) and th…
We report on the first Raman data of Cu substituted La(1-y)Sr(y)Mn(1-x)Cu(x)O3 (0 < x < 0.10 and 0.17 < y < 0.3, accordingly in order to have the same Mn(4+)/[Mn(4+)+Mn(3+)] ratio), collected in the frequency range 100-900 cm-1 and at room temperature, with parallel and crossed polarizations of the incident and scatte…
The T-dependence of magnetic moments in SrB_6 is studied through spin-polarized band calculations for a supercell of Sr_{27}B_{156} containing a B_6 vacancy. The magnetic moment decays rather quickly with T despite the fact that only electronic Fermi-Dirac effects are included. This result and the T-dependence of mome…