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。
Abstract Ethynedithiol‐based polyeneoligosulfides have been synthesized in 96% yield by the reaction of sodium acetylides (HCCNa, NaCCSNa) and elemental sulfur through the NaC sp bond in liquid ammonia with the following spontaneous polymerization of ethynedithiols (HSCCSH) formed by the hydrolysis. The polyeneoli…
Coupling between axial and torsional degrees of freedom often modifies the conformation and expression of natural and synthetic filamentous aggregates. Recent studies on chiral single-walled carbon nanotubes and B-DNA reveal a reversal in the sign of the twist-stretch coupling at large strains. The similarity in the r…
The extrapolation length adopted in the Tilley–Zeks model of ferroelectric thin films plays a substantial role in governing the dielectric properties of thin films through the boundary conditions. The boundary conditions under an applied field are reexamined. The exact formulas for the transition temperature, the diel…
We propose a theory of microphase separation of the double-grafted copolymer melts with different types of branch point distribution. It is shown that copolymers with gradient sequence of the branch points form a microstructure easier (at smaller values of the Flory-Huggins parameters) than equivalent copolymers with…
Abstract Polycondensation‐type poly(amic acid) (PAA) was synthesized with 3,3′,4,4′‐benzophenonetetracarboxylic dianhydride as a dianhydride monomer and 4,4′‐diaminodiphenylmethane and 4,4′‐oxydianiline as diamine monomers under microwave irradiation in dimethylformamide. Then, PAA was used to make polyimide (PI) by i…
Abstract A series of molecular‐weight‐controlled imide resins end‐capped with phenylethynyl groups were prepared through the polycondensation of a mixture of 1,4‐bis(4‐amino‐2‐trifluoromethylphenoxy)benzene and 1,3‐bis(4‐aminophenoxy)benzene with 4,4′‐oxydiphthalic anhydride in the presence of 4‐phenylethynylphthalic…
The Oxford Protein Production Facility (OPPF) was established to develop methods for high-throughput protein production and crystallization. As part of these developments, and in the context of the European SPINE project, a pilot study was undertaken on 48 proteins from Bacillus anthracis from protein families which w…
Recently, the importance of the orbital degrees of freedom (the multipole moment) has been clarified in the f-electron systems. In particular, the multipole ordering that the multipole moment orders spontaneously have been intensively studied because of the appearance of the unusual behaviors which have not known.\n\n…
The catalytic oxidation of thiols to the corresponding disulfides using Preyssler's catalyst H(14)[NaP(5)W(30)O(110)] has been studied. These highly selective oxidations gave good yields of the target disulfides.
Circular dichroism (CD) spectroscopy beamlines at synchrotrons produce dramatically higher light flux than conventional CD instruments. This property of synchrotron radiation circular dichroism (SRCD) results in improved signal-to-noise ratios and allows data collection to lower wavelengths, characteristics that have…
We report on an x-ray resonance exchange scattering (XRES) study of multiferroic $\mathrm{Tb}\mathrm{Mn}{\mathrm{O}}_{3}$. Magnetic scattering is observed close to the $\mathrm{Mn}\phantom{\rule{0.2em}{0ex}}K$ edge and the $\mathrm{Tb}\phantom{\rule{0.2em}{0ex}}{L}_{III}$ and ${L}_{II}$ edges. Surprisingly, Tb shows X…
The general chemical properties of Brown Forest Soils (BFS) differ according to the nature of their parent materials. The influence of volcanic ash as a soil parent material must be regarded as a factor producing differences in the submontane zone of the Kanto and Chubu districts in Japan. To determine the influence o…
The photoinduced ring opening of a [1,3]oxazine ring generates simultaneously two chromophores able to absorb in the same region of the visible spectrum. The additive absorptive properties of the two photogenerated chromophores translate into the amplification of the coloration efficiency of this bichromophoric molecu…
The nature of neutral defect states in PbTe, a narrow band-gap semiconductor, has been studied using density functional theory and supercell models. We find that the defect states associated with different substitutional impurities and native point defects found in bulk PbTe are preserved in the film geometry, but get…
Abstract The low thermal conductivity of the thermoelectric material β‐Zn 4 Sb 3 has been linked to disorder arising from multiple interstitial Zn sites. Here we investigate the energetics and local distortions associated with these interstitial sites via DFT calculations. Our results show the β‐Zn 4 Sb 3 structure is…
The interplay between the orbital ordering and the spin state in Jahn-Teller ${\mathrm{Mn}}^{3+}$ governing the optical, magnetic, and transport properties in the layered $\mathrm{Cs}\mathrm{Mn}{\mathrm{F}}_{4}$ perovskite is investigated. Such electronic effects are strongly coupled to the lattice and thus can be mod…
Site-specific functionalization of oxide nanostructures gives rise to novel optical and chemical surface properties. In addition, it can provide deeper insights into the electronic surface structure of the associated materials. We applied chemisorption of molecular hydrogen, induced by ultraviolet (UV) light, followed…
The poly(isocyanide) skeleton is shown to be a good support for assemblies of molecular units which permit p-type charge transport. A poly(isocyanide) containing tetrathiafulvalene (TTF) moieties in the side chains has been synthesized and characterized in its neutral state and has been oxidized to generate mixed vale…
Highly-conductive organic charge-transfer complex films are successfully fabricated by an inkjet printing technique in which the soluble donor and acceptor components are printed individually and combine on the substrate to form complex films. The method enables us to produce conductive (10 S/cm) tetrathiafulvalene-te…
Abstract Scaling predictions for bottle‐brush polymers with a rigid backbone and flexible side chains under good solvent conditions are discussed and their validity is assessed by a comparison with Monte Carlo simulations of a simple lattice model. It is shown that typically only a rather weak stretching of the side c…