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。
Highly oriented ZnSe nanorods were grown on a ZnSe epilayer on GaAs(001) substrate by metalorganic chemical vapour deposition without any introduced catalysts. Cathodoluminescence spectra and images of individual nanorods, projecting from the buffer layer, were obtained at various temperatures down to 4.5 K in a scann…
Carbon nanotubes (CNTs) and nanofibres (CNFs) are grown on bulk-micromachined silicon surfaces by thermal and plasma-enhanced chemical vapour deposition (PECVD), with catalyst deposition by electron beam evaporation or from a colloidal solution of cobalt nanoparticles. Growth on the peaked topography of plasma-etched…
We report a fundamentally new growth mechanism for single crystalline nanobelts, namely, the growth and coalescence of nanobranches. The growth process of the nanobelts includes four typical steps such as nucleation and growth of the stem, nucleation and growth of the nanobranches at the expense of the stem, widening…
Different from the conventional liquid theory, experimental evidence suggests that there might be discontinuous liquid-liquid (L-L) structure transitions for some alloys. By the resistivity experiments, it is assumed that a temperature-induced L-L structure transition might occur in liquid lead-bismuth ( PbBi ) alloy.…
Submonolayers of nickel oxide were grown on the Ag(001) surface by evaporation of Ni in the presence of O 2 at a pressure of 1 × 10 −6 mbar. In the early stages of deposition, two-dimensional oxide islands with a (2 × 1) periodicity grow on Ag(001). After annealing at about 500 K, the (2 × 1) single atomic layer trans…
Epitaxial ZnO nanowires and random-growth-oriented nanobelts were grown on c -plane sapphire with and without a pre-coated ZnO epilayer film. On the pre-coated ZnO epilayer, ZnO nanowires are vertically aligned with good in-plane alignment as a result of homoepitaxy, whereas on the bare c -plane sapphire, besides a fe…
Low-temperature spin dynamics in the face-centered-icosahedral Zn-Mg-Tb quasicrystal has been investigated by inelastic neutron scattering around its spin-glass-like freezing temperature $({T}_{\mathrm{f}}\ensuremath{\simeq}5.8\phantom{\rule{0.3em}{0ex}}\mathrm{K})$. A single broad inelastic peak, centered at $\ensure…
We present a molecular-level simulation study of the effects of confinement on chemical reaction equilibrium in nanoporous materials. We use the reaction ensemble Monte Carlo (RxMC) method to investigate the effects of temperature, nanopore size, bulk pressure, and capillary condensation on the nitric oxide dimerizati…
A dimeric capsule of coordination bowl 1 encapsulated a nine-residue peptide (Trp-Ala-Glu-Ala-Ala-Ala-Glu-Ala-Trp; 2) within the large hydrophobic cavity in water, and stabilized the alpha-helical conformation of bound 2. An NMR titration experiment revealed that monomeric bowl 1 recognized two Trp residues at the bot…
The New York Structural GenomiX Research Consortium (NYSGXRC) has selected the protein coded by yxaF gene from Bacillus subtilis as a target for structure determination. The yxaF protein has 191 residues with a molecular mass of 21 kDa and had no sequence homology to any structure in the Protein Data Bank (PDB) at the…
Near normal incident infrared reflectivity spectra of (001) SrTi1−xNbxO3 single crystal have been measured at different temperatures in the frequency region between 100 and 6000 cm−1. The optical parameters of phonons and plasmons are obtained on the basis of the double-damping extended Drude model. The lowest frequen…
The problem of soot emissions from diesel engines is introduced and the possible solution of combining doped perovskites and microwave (mw) irradiation to "clean up" diesel soot filters is outlined. Eighteen doped perovskite catalysts are synthesized and tested for propane and CO oxidation, which are taken as model co…
Hyper-Rayleigh or second harmonic Rayleigh scattering (HRS or SHLS) has been employed to measure equilibrium physical properties of molecules in solution. It has been utilized in our laboratory to obtain the dissociation constants of weak organic acids such as substituted benzoic and cinnamic acids in solution. Partit…
We succeeded in the synthesis of certain poly(silsesquioxane)s (poly(SCC)) with excellent refractive indices properties, which have pendant norbornadiene (NBD), azobenzene (AZ), and anthracene (AT) moieties. The photochemical reactions of the obtained poly(SCC) derivatives were examined in the film state upon UV irrad…
The "templating" K crown ether cation allows for the preparation of soluble layered oxalate-based bimetallic magnets, as in [K(18-crown-6]3{Mn3(H2O)4[Cr(ox)3]3}, with an unprecedented bidimensional polymeric anionic network that involves both oxalato bridges and H bonds. As in other 2D oxalate-bridged compounds, the c…
We report the synthesis of periodic mesoporous organosilica (PMO) spheres of a size between 3 and 14 μm. The ethylene-bridged PMO spheres were prepared via surfactant (dodecyltrimethylammonium bromide) mediated assembly of 1,2-bis(triethoxysilyl)ethylene without using any additional cosolvents and/or cosurfactants. Th…
We studied polycrystalline samples of the prototype magnetocaloric system Gd5Ge4 using scanning Hall imaging and global magnetometry. The magnetic field required to complete the phase transition that is critical for magnetocaloric application is reduced by up to 20% when small fragments, each consisting of several ran…
Photoinduced circular anisotropy has been demonstrated in thin films of a main-chain polymeric liquid crystal (PLC) system doped with photochromic W-shaped molecules containing two azobenzene groups by irradiating with circularly polarized light (CPL). Reversible photoinduced circular dichroism (CD) was observed with…
Solubilization of single walled carbon nanotubes (SWNT) in the presence of polycyclic aromatic hydrocarbons (PAHs) such as p-terphenyl and anthracene has been shown. The suspensions formed are stable for periods greater than 48 months but to date experimental research is scarce regarding the interactions that are taki…
The excitation of surface plasmons (SPs) by optically excited silicon quantum dots (QDs) located near a Ag interface is studied both experimentally and theoretically for different QD-interface separations. The Si QDs are formed in the near-surface region of an $\mathrm{Si}{\mathrm{O}}_{2}$ substrate by Si ion implanta…