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。
The measurement of small-angle neutron scattering on functionalized single-wall carbon nanotubes in solution is reported. Without the use of surfactants, isolated rigid rod behavior of functionalized single-wall carbon nanotubes has been observed. The onset of pinning between the nanotubes at different pinning distanc…
The correlated Einstein model for EXAFS parallel and perpendicular mean-square relative displacements (MSRDs) is discussed. By means of dynamical simulations on different crystalline structures, the error owing to the Einstein-fit model on the EXAFS MSRDs is estimated as a function of the standard deviation of the den…
This paper describes the sputter deposition and characterization of nickel titanium (NiTi) thin film shape memory alloy onto the surface of an optical fiber Bragg grating. The NiTi coating uniformity, crystallinity, and transformation temperatures are measured using scanning electron microscope, x-ray diffraction, and…
The performance of a 10 mm diameter pyroelectric detector coated with a single-wall carbon nanotube (SWCNT) was evaluated in the 0.8 to 20 microm wavelength range. The relative spectral responsivity of this detector exhibits significant fluctuations over the wavelength range examined. This is consistent with independe…
A new chiral cationic amphiphile has been synthesized. Sol-gel transcriptions were carried out to control mesoporous silica nanostructures using the organic self-assemblies of this amphiphile as templates. Left-handed coiled mesoporous silica nanoribbons were obtained in the mixture of 1-propanol and 2.5 wt% NH(3) aq.…
A single crystal copper nanowire was bent and characterized using high resolution electron backscatter diffraction. The boundary conditions of the experiment were studied using crystal plasticity finite element analysis in conjunction with a dislocation density based constitutive hardening model including geometricall…
Silicone rubber seals are being considered for a number of interfaces on NASA's Crew Exploration Vehicle (CEV). Some of these joints include the docking system, hatches, and heat shield-to-back shell interface. A large diameter molded silicone seal is being developed for the Low Impact Docking System (LIDS) that forms…
The relation between annealing temperature and surface photovoltage (SPV) shifts on the $\text{Si}(111)7\ifmmode\times\else\texttimes\fi{}7$ surface of lightly $n$-doped substrates has been studied by core-level and valence-band photoelectron spectroscopies at 100 K. The SPV shift was found to depend strongly on the a…
Double photoionization (DPI) of an atom by a single photon is a direct consequence of electron-electron interactions within the atom. We have measured the evolution of the K-shell DPI from threshold up in transition metals by high-resolution x-ray emission spectroscopy of the Kh alpha hypersatellites, photoexcited by…
Abstract We report the results of the first principles calculations performed in order to investigate the electronic and magnetic properties of the Fe–N systems and to clarify the origin of giant magnetic moments in Fe–N systems. After geometrical optimization, the densities of states have been evaluated with atom res…
We have studied the temperature dependence of the growth mode and microstructure evolution in highly mismatched sputter-grown ZnO/Al(2)O(3)(0001) heteroepitaxial films. The growth mode was studied by real-time synchrotron x-ray scattering. We find that the growth mode changes from a two-dimensional (2D) layer to a 3D…
Nanodiamond (ND) is surrounded by layers of graphite on its surface. This unique structure feature creates unusual fluorescence spectra, which can be used as an indicator to monitor its surface modification. Meanwhile, the impurity, nitroso (CNO) inside the ND can be photolyzed by two-photon absorption, releasing NO…
Abstract The present investigation deals with the mechanical, thermal, and morphological properties of binary nylon 66/maleic anhydride grafted ethylene propylene rubber (EPR‐g‐MA) blends at different dispersed phase (EPR‐g‐MA) concentrations. The effects of EPR‐g‐MA concentration and dispersed particle size on the me…
(Ln0.9Gd0.05Yb0.05)2Zr2O7 (Ln = Sm, Nd) ceramics were synthesized by pressureless sintering at 1700 °C in air using powders with a chemical-coprecipitation and calcination method. (Ln0.9Gd0.05Yb0.05)2Zr2O7 ceramics exhibit a single pyrochlore structure. The thermal expansion of (Ln0.9Gd0.05Yb0.05)2Zr2O7 ceramics are o…
The hydrothermal synthesis and structural characterization of the lanthanide silicate system [Na(6)Ln(2)Si(12)O(30).x H(2)O] (Ln=La(3+), Sm(3+), Eu(3+), Gd(3+), and Tb(3+)), named AV-21, has been reported. Structural elucidation of the Sm(3+) analogue (isomorphous with the Eu(3+), Gd(3+), and Tb(3+) frameworks) using…
Emulsions stabilized by colloidal particles, namely Pickering emulsions were prepared by mixing silicone oil with silica particles dispersed in the continuous water phase as functions of silica concentration and silicone oil viscosity. Characteristics of the resulting oil dispersed in water (O/W) emulsions were determ…
We report studies of thermal transport across the interface of a semiconductor heterostructure using x-ray diffraction to measure the time-dependent lattice expansion after ultrafast laser excitation. Femtosecond laser pulses are used to rapidly and locally heat the substrate at the buried interface of an ${\text{Al}}…
From a simple time-dependent tight-binding model, we calculate the absorption spectra of a series of metallic nanoparticles of varying size and shape. Spheres and spheroids of varying aspect ratios as well as a number of polyhedral particle shapes are studied. The frequency of the maximum absorption is found to scale…
The main disadvantage of magnesium alloys relates to their corrosion performance and in particular to their stress corrosion cracking (SCC) behavior under combined service conditions. This paper describes the significant increase in SCC sensitivity of consolidated nano/sub-micron E906 magnesium alloy in 0.9% NaCl solu…
Titanium alloys like Ti6Al4V are widely used in medical engineering. However, the mechanical and chemical properties of titanium alloys lead to poor machinability, resulting in high production costs of medical products. To improve the machinability of Ti6Al4V, 0.9% of the rare earth element lanthanum (La) was added. T…