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 method for reducing the back scattering from bodies with complex impedance boundaries is developed. A nonlinear integral equation system providing zero backscattering is obtained for determining the impedance distribution on the boundaries of infinite cylinders. Numerical results for circular and elliptic cylinders…
The temperature dependence of the nonergodicity factor of vitreous ${\text{GeO}}_{2}$, ${f}_{q}(T)$, as deduced from elastic and quasielastic neutron scattering experiments, is analyzed. The data are collected in a wide range of temperatures from the glassy phase, up to the glass-transition temperature, and well into…
We have been developing host−guest methodology for separation of single-walled carbon nanotubes (SWNTs) with gable-type diporphyrins, designated as nanotweezers. In our previous works, chiral nanotweezers have been found to discriminate left- and right-handed structures ( M and P forms, respectively, defined in our pr…
Single-crystalline SrMn3O6−δ nanoribbons (width of 30–500 nm and lengths of up to several hundred micrometers) are synthesized by a molten-salt method. In contrast with the antiferromagnetism in bulk SrMn3O6−δ, magnetization measurements show weak ferromagnetism in these nanoribbons at low temperature. In particular,…
Extensive ab initio finite electric-field calculations are performed to study the static transverse dielectric properties of boron nitride nanotubes via the sawtooth potential approach. It is shown that the transverse polarizability is proportional to the tube radius rather than to the square of it, and that the scree…
Single-walled carbon nanotubes (SWCNTs), which were commercial grade containing 60-70 wt% impurity, were treated in a mild poly(phosphoric acid) (PPA). The purity of PPA treated SWCNTs was greatly improved with or without little damage to SWCNTs framework and stable crystalline carbon particles. An amide model compoun…
We have investigated the crystal nucleation behavior of potassium hexacyanoferrate(III) (KFC) in an isolated aqueous microdroplet surrounded by a decanol medium which is isothermally driven to supersaturation by water transport from the droplet, to examine the influence upon KFC nucleation by self-assembled surfactant…
This is an energizing time to be a biomaterials scientist and an appropriate moment to examine the state-of-the-art, current trends and future directions in biomaterials research. In nearly every area of mathematics, physics, and engineering, there is a movement toward using biology as a source of interesting question…
We show that the imaginary parts of higher-order optical nonlinearities and their decay times can be determined by a time-intensity domain analysis of the conventional transient absorption data. Using this method we have measured the values and decay times of third, fifth and seventh-order nonlinear susceptibilities o…
Abstract As one type of high‐performance fibers, the polyimide fibers can be prepared from the precursor polyamic acid via dry‐spinning technology. Unlike the dry‐spinning process of cellulose acetate fiber or polyurethane fiber, thermal cyclization reaction of the precursor in spinline with high temperature results i…
Chiral poly{9,9-bis[(3 S )-3,7-dimethyloctyl]-2,7-fluorene) shows temperature-induced aggregation in 1-octanol. For polymer concentrations of >0.01 mg/mL and cooling rates of ≤10 °C/h, aggregates form, showing characteristics of the β phase of polyfluorene. At higher cooling rates, lower concentration, or both, anothe…
We report on the photocurrent of silicon nanocrystal (Si NC) photodetectors (PDs) that contain silver (Ag) islands. Here, a larger increase in the photocurrent of Si NC PDs was observed with increasing Ag island size. The maximum increase occurred at the wavelength of the Ag surface plasmon resonance and redshifted as…
Abstract Asymmetric structural foams were prepared by compression molding to study the flexural properties of these sandwich structures with different layer thickness. It was found that the flexural properties of asymmetric structural foams are function of load direction. Since the bending behavior is a combination of…
Abstract Silica with an average particle size of 125 nm was prepared by the sol–gel reaction of tetraethoxysilane with a base catalyst and then modified with a vinyl‐functionalized silane [γ‐methacryloxypropyl trimethoxysilane (MPS)]. The composite latex, with the modified silica as the core and poly( n ‐butyl acrylat…
Abstract Desulfotomaculum kuznetsovii ( D. kuznetsovii ), a thermophilic sulfate‐reducing bacterium (SRB), was identified in a cooling tower of a petroleum refinery by 16S rRNA gene sequencing and its functional gene encoding dissimilatory sulfite reductase ( dsr AB). The thermophilic sulfate‐reducing bacterial specie…
Since the early eighties Snecma Propulsion Solide (SPS) pioneered development into the Ceramic Matrix Composites (CMC) to increase the durability of the Carbon-Carbon materials in oxidative environment. Because aircraft engine application are aimed, long life endurance of thousands hours in operation are needed. Moreo…
The temperature dependent electrical conductivity of highly aligned, as-grown, pristine films of ultralong single-walled carbon nanotubes (SWNTs) is investigated in the framework of conduction based on phonon-assisted electron hopping. A change in transport mechanism occurs between conduction normal to and parallel to…
The minimum limit to the thermal conductivity of disordered, layered solids is studied by accounting for minimum scattering times and velocities from oscillations of atoms bound by different interatomic forces. The model developed in this work allows for quantification of changes in the lower limit to thermal conducti…
We report on the effect of nanocrystal size on the photocurrent of silicon nanocrystal (Si NC) photodetectors. The photocurrent onset energy was increased with decreasing the size of Si NCs, which agreed with the blueshift in the absorption onset. The increase in the quantum efficiency with increasing the size of Si N…
In this paper, a facile and environmentally friendly route, an ice-templating method, has been developed to prepare polyaniline (PANI) microflakes stacked by one-dimensional (1D) uniform nanofibers with diameters in the range 22−32 nm. Although the ice-templating method has been used for preparing ultrapure materials…