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。
It has recently been observed that a diblock copolymer melt can undergo a second microphase separation with increasing temperature. We use an equation-of-state description along with the random phase approximation to study the stability of the disordered system, and calculate the lower critical ordering temperature as…
Abstract Graft copolymerization of spiropyran‐containing methacrylate (SPMMA) and acrylamide (AM) onto the surface of a porous polymer membrane was carried out. The permeability of the graft membrane varied with ultraviolet (UV) ‐ or visible‐light irradiation. It was found that the change by UV‐light irradiation of th…
Diamond films are predominantly grown using approximately 1% of a hydrocarbon precursor in hydrogen gas. Hydrogen is generally believed to be necessary for the diamond thin-film growth process. However, hydrogen in varying amounts is inevitably incorporated in the growing diamond lattice, leading to structural defects…
Hybridization of the ${\mathrm{\ensuremath{\sigma}}}^{\mathrm{*}}$ and ${\mathrm{\ensuremath{\pi}}}^{\mathrm{*}}$ states of the graphene network is shown to be as important as band-folding effects in determining the metallicity of small radius carbon nanotubes. Using detailed plane-wave ab initio pseudopotential local…
We derive the average sedimentation rate, in the non-Brownian limit, for monodispersed spheres in systems ranging from dilute to concentrated. A collection of monodisperse hard spheres suspended in a viscous fluid constitutes a single scaled system. A mean-field approach was used to determine the energy balance during…
Sodium silicoglycolate, an organosilicon compound in which silicon is in 5-coordination with respect to oxygen, is shown to be a reaction intermediate in the synthesis of a purely siliceous sodalite with ethylene glycol as solvent. The presence of silicon-29 nuclear magnetic resonances at -105.5 +/- 0.3 parts per mill…
Injectable nanoparticulate carriers have important potential applications such as site-specific drug delivery or medical imaging. Conventional carriers, however, cannot generally be used because they are eliminated by the reticulo-endothelial system within seconds or minutes after intravenous injection. To address the…
Equivalent circuit modelling of electrochemical systems using AC impedance analysis is a widely accepted technique. However, there are systems for which the method is not well suited, and the current interrupt technique can sometimes be used as an alternative method of establishing a circuit model. The current interru…
Im IR‐Bereich liegt die π,π*‐Absorptionskante (Q‐Bande) des löslichen Porphyrinpolymers 1 , die obendrein ungewöhnlich intensiv ist. Elektroabsorptionsspektren zeigen, daß das Polymer 1 eine sehr große nichtlineare Suszeptibilität dritter Ordnung aufweist. magnified image
The previously described picture, for the lattice parameter behaviour of three site intermetallics in the L21 phase, is now applied to the C1b compounds. It is argued that the observed data, for several sequences of C1b compounds, can again be qualitatively understood in terms of the relevant d (or p) site occupation…
By a combination of experimental data [from the Ni (111) (2\ifmmode\times\else\texttimes\fi{}2)-K structure], model calculations, and simple formal theory, it shown that a strong initial-state effect exists in backscattering photoelectron diffraction, which can be ascribed to the parity of the emitted photoelectron so…
We report on systematic measurements of the viscosity of concentrated colloidal silica suspensions as a function of the volume fraction of particles and of the ionic strength. The experimental results are rescaled on a universal curve using a direct renormalization procedure which is described; the scaling ratios are…
The title compound, Na 6 H 3 [SmW 10 O 36 ].28H 2 O, coexists of a decatungstosamarate anion, six fivefold- or sixfold-coordinated Na + cation and water molecules of crystallization. The decatungstosamarate anion is comprised of two [W 5 O 18 ] 6- moieties chelating to a central Sm 3+ cation, which has tetragonal anti…
The conversion between polarization states upon reflection on the weakly corrugated interface between uniaxial crystals and isotropic media is studied by means of a model based on the Rayleigh hypothesis. We deal with sinusoidal gratings with the wave vector of the incident light being perpendicular to the grating gro…
Optical properties of Ge-Se-Te chalcogenide glasses for CO2 laser light transmission are investigated. It is found that the Te content of more than about 60 mol % is essential in reducing fundamental absorption caused by lattice vibration at 10.6 μm (CO2 laser light wavelength). It is also found that the Se content ab…
A generalized mathematical description of thermally stimulated luminescence (TL) and thermally stimulated conductivity (TSC) is presented in terms of a formulation that replaces the quasiequilibrium (QE) and kinetic-order approximations by two new functions Q(T) and P(T), respectively. These functions are related and…
The ultraviolet photodissociation and photodesorption of CD3I adsorbed on the TiO2(110) surface at ∼100 K has been investigated at 257, 275, 302, and 351 nm using modulated continuous-wave laser irradiation followed by resonantly enhanced multiphoton ionization of fragments expelled from the adsorbate layer. Photodiss…
We study the nematic-smetic A phase transition of binary mixture of parallel hard cylinders of different lengths. We use the Helmholtz free energy truncated at the second virial term. Changing values of q (length of a longer cylinder), x (composition) and η (packing fraction) of the cylinders, we obtained the transiti…
The structures of the title compounds, iron lutetium zinc oxides, can be described as a close packing of O atoms, with Lu atoms in octahedral voids and Fe and Zn atoms in tetrahedral voids. Blocks constituting m + 1 layers of Fe and/or Zn atoms along the c axis are alternately stacked with single layers of Lu along th…
Diamond (100) and (111) surfaces have been exposed to beams of atomic and molecular fluorine and chlorine in an ultrahigh-vacuum environment. X-ray photoelectron spectroscopy, low-energy electron diffraction, and thermal desorption techniques have been used to elucidate the chemistry involved. F atoms add to both the…