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。
We studied the catalytic water−gas shift reaction over commercial Cu−ZnO−Al 2 O 3 (LTS-C) and Cu-promoted Fe−Cr oxide (HTS-C) catalysts as well as a high-temperature Cu-promoted (UFR-C) catalyst developed in our laboratory. The catalysts were characterized by different techniques such as X-ray diffraction, thermogravi…
Olefin epoxidation provides an operative protocol to investigate the oxygen transfer process in nature. A novel manganese complex with a cross-bridged cyclam ligand, MnIV(Me2EBC)(OH)2(2+) (Me2EBC = 4,11-dimethyl-1,4,8,11-tetraazabicyclo[6.6.2]hexadecane), was used to study the epoxidation mechanism with biologically i…
Efficient lasing is demonstrated from a clear dispersion of silane-modifed Nd2O3 nanoparticles in dimethylsulfoxide. Surface modification with the silane helps to disperse the nanoparticles, as indicated in the figure. The fluorescence lifetime and quantum yield of the dispersed nanoparticles are amongst the highest o…
International audience
A nonequilibrium kinetic model was developed to describe the reversible adsorption and desorption behavior of CO 2 in a K-promoted hydrotalcite-like compound (HTlc). The model consisted of three reversible reactions. Two of the reactions were of the Langmuir−Hinshelwood type with slow and intermediate kinetics, and on…
A perylene bisimide anchored with melamine hydrogen-bonding units has been prepared, and its supramolecular polymerization upon binding with N-dodecylcyanurate (CA) was examined. The resulting flexible supramolecular polymers self-organized via a pi-pi stacking interaction between perylene chromophores, affording ribb…
The reaction of K28Li5H7[P8W48O184].92H2O with early lanthanides under hydrothermal and conventional conditions yields novel structures of the molecular formula Ln4(H2O)28K6Li7[K subsetP8W48O184(H4W4O12)2Ln2(H2O)10] congruent with 57H2O, Ln = La (1), Ce (2, 2a), Pr (3), Nd (4), in which the central cavity of the precu…
Plastic relaxation of carbon nanotubes under tension and at high temperature is described in terms of dislocation theory and with atomistic computer simulations. It is shown how the glide of pentagon-heptagon defects and a particular type of their pseudoclimb, with the atoms directly breaking out of the lattice, work…
Collagen, a fibrous protein, is an essential structural component of all connective tissues such as cartilage, bones, ligaments, and skin. Type I collagen, the most abundant form, is a heterotrimer assembled from two identical alpha1 chains and one alpha2 chain. However, most synthetic systems have addressed homotrime…
The lateral order of poly(styrene- block -isoprene) copolymer (PS- b -PI) thin films is characterized by the emerging technique of resonant soft X-ray scattering (RSOXS) at the carbon π* resonance and compared to ordering in bulk samples of the same materials measured using conventional small-angle X-ray scattering. W…
In a recent paper [Duan et al., Phys. Rev. B 73, 174203 (2006)], we derived explicit expressions for the effective conductivities of heterogeneous media containing perfectly bonded ellipsoidal inclusions of diverse shapes, spatial distributions, and orientations. In this paper, we take into account the effect of three…
Existing electrochemical experiments and models of fuel oxidation postulate about the importance of different oxidation pathways and relative fuel conversion efficiencies, but specific information is often lacking. Experiments described below present the first direct, in situ measurements of relevant chemical species…
In this paper, novel honeycomb- and flowerlike CuO nanoarchitectures assembled from nanowires and nanoribbons were successively prepared on copper foils by an anion-controlled mild hydrothermal method. A series of control experiments confirm that the concentration of inorganic anions, the concentration of surfactant,…
The nonequilibrium cation site occupancy in nanosized zinc ferrites $(\ensuremath{\sim}6--13\phantom{\rule{0.3em}{0ex}}\mathrm{nm})$ with different degree of inversion ($\ensuremath{\sim}0.2$ to 0.4) was investigated using Fe and Zn $K$-edge x-ray absorption near edge spectroscopy (XANES) and extended x-ray absorption…
The effect of HF etching of the silicon oxide shell covering the surface of Si nanocrystals (NCs) on the subsequent room-temperature atmospheric oxidation of Si-NCs has been investigated by means of photoluminescence measurements, Fourier transform infrared spectroscopy, and electron paramagnetic resonance spectroscop…
We study decoherence processes of an S = 1/2 localized spin coupled to conduction band electrons in a metal or a semiconductor via an Ising-like interaction. We derive master equations for the density matrix of the localized spin, by tracing out all degrees of freedom in the conduction electron system based on the lin…
Kicking out cholesterol: The release of guest molecules (cholesterol) included in the pores of mesoporous silica is promoted by simultaneous irradiation with UV and visible light. The reversible cis–trans photoisomerization of azobenzene substituents on the pore surface causes a stirring action, which accelerates the…
Uniform-sized monodisperse cerium oxide nanoparticles were prepared in a one-step reaction. A cerium−oleate complex was heated in an organic solvent with high boiling point to decompose and form nanocrystals. The products were characterized by Raman spectroscopy, XRD, UV−visible spectroscopy, room-temperature photolum…
Its low weight, high melting point, and large degree of hardness make elemental boron a technologically interesting material. The large number of allotropes, mostly containing over a hundred atoms in the unit cell, and their difficult characterization challenge both experimentalists and theoreticians. Even the ground…
Interrelations of domain wall (extrinsic) contributions to dielectric, piezoelectric and mechanical properties of ferroic samples are a hot subject of both theoretical and experimental research. Recently,we have derived theoretical formulas for such contributions, using model of composite layer sample: central single-…