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。
A synthetic water-soluble meso-tetra(2,6-dichloro-3-sulfonatophenyl)porphyrinate of iron(lll) chloride (FeP) was used as biomimetic catalyst in the oxidative coupling of three monomeric phenols (catechol, caffeic, and p-coumaric acids), which are common constituents of natural humic substances. The extent of oxidation…
In this paper we investigate the electronic structure and the thermopower for $\mathrm{Ni}({\mathrm{Ti}}_{0.5}{\mathrm{Hf}}_{0.5})\mathrm{Sn}$ and related half-Heusler compounds. Two different methods have been used to calculate the electronic structure, i.e., full potential linearized augmented plane wave method for…
Shape memory alloys (SMAs) have great potential for use in the field of civil engineering. The authors of this paper have been involved, from 1996, in several experimental and theoretical studies of the application of SMAs in civil engineering, for national and international research projects. This paper provides an o…
X-ray diffraction has been used to study the epitaxy and lattice expansion of thin films grown coherently on by kinetically controlled sequential deposition. The coherent growth of on Si produces films with greater in-plane compressive strain than previously attained, %. The measured expansion of the out-of-plane latt…
We demonstrate that a transition from a compact geometry (sphere) to a structured geometry (several spheres connected by nanoconduits) in nanotube-vesicle networks (NVNs) induces an ordinary enzyme-catalyzed reaction to display wavelike properties. The reaction dynamics can be controlled directly by the geometry of th…
A geometry-based density-functional theory is presented for mixtures of hard spheres, hard needles, and hard platelets; both the needles and platelets are taken to be of vanishing thickness. Geometrical weight functions that are characteristic for each species are given, and it is shown how convolutions of pairs of we…
Various enzymes are encapsulated in ordered mesoporous silica analogous to a fish in a net, where the enzymes are entrapped in macroporous cages that are connected by uniform mesoporous channels (see Figure). Most importantly, these encapsulated enzymes act as nanoreactors, showing not only comparable activities with…
Systematic analysis of extensive experimental data confirms the theoretical prediction of three intrinsic relationships of lattice parameters between the recently discovered intermediate monoclinic ${\mathrm{M}}_{\mathrm{C}}$ phase and the conventional tetragonal phase in ferroelectric $\mathrm{Pb}[{({\mathrm{Mg}}_{1∕…
Electro-oxidation of methanol on NiO-promoted Pt ∕ C and Pd ∕ C catalysts in alkaline media was studied. Such electrocatalysts are superior to pure Pt or Pd electrocatalysts. Electrochemical measurements revealed that the addition of NiO into Pt ∕ C or Pd ∕ C catalysts could significantly improve electrode performance…
The temperature and photoexcitation density dependences of the electron transport dynamics in electrolyte-filled mesoporous ${\mathrm{TiO}}_{2}$ nanoparticle films were investigated by transient photocurrent measurements. The thermal activation energy of the diffusion coefficient of photogenerated electrons ranged fro…
One-dimensional nanocomposite colloids are prepared by means of electrostatic self-assembly of CdTe nanocrystals on both carbon nanotubes (CNTs) and silica-coated CNTs (see Figure). The dense coverage of these linear nanoparticle assemblies minimizes the spacing between the nanocrystals, thereby facilitating efficient…
The syntheses of monotetrathiafulvalene-calix[4]pyrrole 5 and bistetrathiafulvalene-calix[4]pyrrole 6, prepared from the acid-catalyzed condensation of monopyrrolo[3,4-d]tetrathiafulvalene (MPTTF, 7) with acetone in the presence of tripyrrane 8 and dipyrromethane 9, respectively, are described. Compound 5 and the prev…
Large-area amorphous calcium carbonate (ACC) films in air are shown to be transformed into crystalline calcium carbonate (CaCO(3)) films via two modes-dissolution-recrystallization and solid-solid phase transition-depending on the relative humidity of the air and the temperature. Moisture in the air promotes the trans…
Effect of temperature on interfacial sliding in single-walled carbon nanotube polycarbonate composites is investigated experimentally. We show that interfacial slip at the tube-polymer interfaces can be activated at relatively low dynamic strain levels ( approximately 0.35%) by raising temperature to approximately 90…
While electrical compatibility constraints normally prevent head-to-head (HH) and tail-to-tail (TT) domain walls from forming in ferroelectric materials, we propose that such domain walls could be stabilized by intentional growth of atomic layers in which the cations are substituted from a neighboring column of the pe…
The near-field interaction of an atom with a dielectric surface is inversely proportional to the cube to the distance to the surface, and its coupling strength depends on a dielectric image coefficient. This coefficient, simply given in a pure electrostatic approach by (eps-1) / (eps+1) with eps the permittivity, is s…
The crystal structures of the NaxCoO2 phases based on three-layer NaCoO2, with x=0.32, x=0.51, x=0.60, x=0.75 and x=0.92, determined by powder neutron diffraction, are reported. The structures have triangular CoO2 layers interleaved by sodium ions, and evolve with variation in Na content in a more complex way than has…
Using NMTO-{\it downfolding} technique, we explore and establish the origin of ferromagnetism in the pyrochlore system, Tl$_{2}$Mn$_{2}$O$_{7}$. It is found to be driven by hybridization induced spin-polarization of the delocalized charge carriers derived from Tl-$s$ and O-$p$ states. The mean-field estimate of the fe…
Using Dynamical Mean Field Theory (DMFT) and Monte Carlo (MC) simulations, we study the ferromagnetic transition temperature Tc of a two-band model for Diluted Magnetic Semiconductors (DMS), varying coupling constants, hopping parameters, and carrier densities. We found that Tc is optimized at all fillings p when both…
Abstract The mechanical properties and morphology of multiwall carbon nanotube (MWNT)/polypropylene (PP) nanocomposites were studied as a function of nanotube orientation and concentration. Through melt mixing followed by melt drawing, using a twin screw mini‐extruder with a specially designed winding apparatus, the d…