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 transition of the internal structure in microwave chemical-vapor-deposited carbon nanotubes is investigated using scanning electron microscopy and high-resolution transmission electron microscopy. By controlling the thickness of the iron catalyst layer, a sequence of carbon nanotube films was obtained with diamete…
Abstract Oxide dispersion strengthening (ODS) steels have been considered to be very promising for fuel clad materials for high burn-up operation of light water reactor and super critical water reactor. For improving the corrosion resistance, increasing chromium concentration, which often resulted in degradation of me…
The complex refractive index of SiO2 layers containing Si nanoclusters (Si-nc) has been measured by spectroscopic ellipsometry in the range from 1.5 to 5.0 eV. It has been correlated with the amount of Si excess accurately measured by x-ray photoelectron spectroscopy and the nanocluster size determined by energy-filte…
Cell-seeded collagen hydrogels have been used in the engineering of many tissue types, from skin and vasculature to spinal cord. One of the primary limitations of collagen-based hydrogels for use in tissue-engineered grafts is that cells seeded within the gel cause it to contract as much as 70%. By forming a composite…
A derivative of arjunolic acid, a naturally occurring chiral triterpenoid, formed gels efficiently with a variety of organic solvents. Electron microscopy images revealed the morphology of the gels consisting of fibers and strands as well as ‘cabbage leaf’ type sheets of micrometer dimensions.
MnAs films were deposited by molecular-beam epitaxy on GaAs(001) and GaAs(111)B surfaces. Imaging of the temperature-dependent magnetic structure by x-ray magnetic circular dichroism photoemission electron microscopy, and the comparison with magnetization measurements by superconducting quantum interference device (SQ…
The amount of oxygen molecules (O2) in amorphous SiO2(a-SiO2), also called interstitial O2, was quantitatively measured by combining thermal-desorption spectroscopy (TDS) with infrared photoluminescence (PL) measurements of interstitial O2 at 1272 nm while exciting with 1064-nm Nd: yttrium aluminum garnet laser light.…
The effect of screening on the emissivity of a field cathode built around a carbon nanotube array is analyzed. A numerical method of solving the Laplace equation for intricate-shape cathodes is developed that makes it possible to relate the amplification factor to the nanotube spacing in arrays containing as many as 2…
High performance molybdenum-doped indium oxide (IMO) films were deposited on slide glass substrates from metallic targets by using dc reactive magnetron sputtering at room temperature. The structural, electrical and optical properties have been investigated as functions of target composition and oxygen partial pressur…
Molecular vascular imaging represents a novel tool that promises to change the current medical paradigm of 'see and treat' to a 'detect and prevent' strategy. Nanoparticle agents, such as superparamagnetic nanoparticles and perfluorocarbon nanoparticle emulsions, have been developed for noninvasive imaging, particular…
Steady-state absorption and emission spectroscopy and time-resolved fluorescence measurements were employed in the study of meso-tetrakis(4-N-methylpyridinium)porphine (TMPyP) interactions with half-generation carboxyl-terminated poly(amidoamine) (PAMAM) dendrimers in water. TMPyP experiences a less polar environment…
Generation 2 to generation 5 poly(amidoamine) (PAMAM) dendrimers having different terminal functionalities were analyzed by capillary electrophoresis (CE). Polyacrylamide gel electrophoresis was also used to assess the composition of the individual generations for comparison with the CE results. Separation of PAMAMs c…
Recent progress in developing perovskite materials as more cost‐effective catalysts in autothermal reforming (ATR) of diesel fuel to hydrogen‐rich reformate for solid oxide fuel cell (SOFC) application is reported. Perovskite‐type metal oxides with B sites partially exchanged by ruthenium were prepared and evaluated u…
A spherical Si solar cell with a semi-light-concentration system was successfully fabricated using a spherical Si crystal produced by a dropping method. The dropping method has great potential for low-waste and low-cost fabrication because the Si spheres can be made directly from dropping melted Si without the cutting…
Freely suspended gold nanoparticle arrays have been fabricated by encapsulation into layer-by-layer nanomembranes. Such nanomembranes (see Figure) retain outstanding micromechanical properties and have an anisotropic mechanical response due to the uniformly oriented nanoparticle-containing stripes. Periodic variation…
Abstract When preparing specimens for TEM analysis, it is important that specimens routinely be large enough to manipulate with forceps and cohesive enough to hold together as a single entity. However, anyone working in EM will have some specimens that are too small to see or centrifuged pellets that easily fall apart…
The microstructure evolution and mechanical properties of alumina doped with rare earth oxide and rare earth-aluminosilicate glass has been investigated in order to understand better the impact of rare earth addition on hardness and fracture toughness. The aims of the present work are to examine the possibly beneficia…
Abstract In spinel (MgAl2O4), the strongest infrared band at 485 cm−1 shows less LO–TO splitting than the medium band at 670 cm−1. This unexpected relationship is explained in terms of the vibrational coupling of these TO modes. A new manner for evaluating the LO mode is proposed.
The mechanical properties of a quasi-symmetrical planar functionally graded material (FGM) of Al2O3 / Al2O3+20%ZrO2 / Al2O3+5%ZrO2 prepared by electrophoretic deposition and pressureless sintering has been studied. Hardness and fracture toughness were measured using indentation methods on cross sections of samples. Fr…
The texture and grain boundary structure of recrystallized materials is dependent upon the character of the deformed matrix, and the selective nucleation and growth of crystallites from the deformation structure. Proper description of the deformed matrix includes not only local crystallite lattice orientation, but als…