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。
Methane activation in the absence of molecular oxygen over metallo-catalysts has been recognized as a potential catalytic process. In the present study, the density-functional theory (DFT) is employed to theoretically explore the mechanism of the nonoxidative dehydrogenation of methane on acid-promoted metal (Mo or W)…
The relative proportions of genetically distinct collagen types in connective tissues vary with tissue type and change during disease progression, development, wound healing, aging. This study aims to 1) characterize the spectro- temporal fluorescence emission of fiber different types of collagen and 2) assess the abi…
This paper describes the preparation of an aqueous dispersion of electrostatically stabilized gold nanocrystals. It also describes the characterization of these nanocrystals by NMR, SAXS, SLS, and TEM prior to and following their modification by chemisorption of 3-mecaptopropanoic acid. Using the insights gained, thes…
This paper describes the formation and characterization of nanosize needle-shaped In(OH) 3 particles. The In(OH) 3 nanopowder was prepared via the sonication of an aqueous solution of InCl 3 at room temperature and at 0 °C. At these temperatures, nonsonicated hydrolysis does not occur. The role of the ultrasound radia…
This paper discusses the influence of electron scavengers (such as oxygen) on the emission properties of colloidal suspensions of nanocrystalline ZnO particles. Emission measurements are performed on deaerated suspensions of ZnO particles in alcohols (2-propanol and ethanol) and other organic solvents (DMF and propyle…
UDP-galactose 4-epimerase catalyzes the interconversion of UDP-glucose and UDP-galactose during normal galactose metabolism. In humans, deficiencies in this enzyme lead to the complex disorder referred to as epimerase-deficiency galactosemia. Here, we describe the high-resolution X-ray crystallographic structures of h…
Multiscale phenomena which include several processes occuring simultaneously at different length scales and exchanging energy with each other, are widespread in magnetism. These phenomena often govern the magnetization reversal dynamics, and their correct modeling is important. In the present paper, we propose an appr…
Monte Carlo statistical mechanical computer simulations of the electric-field poling of second-order nonlinear optical chromophores, characterized by large dipole moments, polarizabilities, and hyperpolarizabilities, are presented. Such theoretical analysis is critical to defining the structure/function relationships…
Porous silica-pillared H + -magadiites were prepared by intragallery amine-catalyzed hydrolysis of TEOS [tetraethylorthosilicate, Si(OC 2 H 5 ) 4 ]. Mixtures of the H + -magadiite, dodecylamine, and TEOS at molar ratios of 1:2:15−30 and 1:2−10:20 resulted in swollen and viscous gel once at room temperature, allowing i…
A study of the physical, mechanical and corrosion resistant properties of all the most common commercially available plastics and elastomers. It offers examples of typical applications and describes methods of joining. The physical, mechanical and corrosion resistant properties of 32 thermoplastics, 20 thermosets, and…
Introduction to Grain and Particle Effects on Ceramic and Composite Properties Grain Dependence of Monolithic Ceramic Properties Grain Dependence of Microcracking, Crack Propagation, and Fracture Toughness at ~22degreeC Grain Dependence of Ceramic Tensile Strengths at ~22degreeC Grain Dependence of Indentation Hardnes…
This book presents a comprehensive review, evaluation, and summary of the dependence of mechanical properties on grain and particle parameters of monolithic ceramics and ceramic composites. Emphasizing the critical link between fabrication and ceramic performance, the book covers the grain dependence of monolithic pro…
Recently it has been recognized that the so-called generalized Wigner distribution may provide at least as good a description of terrace width distributions (TWDs) on vicinal surfaces as the standard Gaussian fit and is particularly applicable for weak repulsions between steps, where the latter fails. Subsequent appli…
Recent lattice model calculations have suggested that a full-layered crystal surface may undergo, under canonical (particle-conserving) conditions, a preroughening-driven two-dimensional phase separation into two disordered flat (DOF) regions, of opposite order parameter. We have carried out extensive classical molecu…
Bilayer two-dimensional electron systems formed by a thin barrier in the GaAs buffer of a standard heterostructure were investigated by magnetotransport measurements. In magnetic fields oriented parallel to the electron layers, the magnetoresistance exhibits an oscillation associated with the depopulation of the highe…
We develop a formalism for the calculation of the frequency band structure of a phononic crystal consisting of non-overlapping elastic spheres, characterized by Lamé coefficients which may be complex and frequency dependent, arranged periodically in a host medium with different mass density and Lamé coefficients. We v…
In the Peierls state very thin samples of TaS_3 (cross-section area \sim 10^{-3} mkm^2) are found to demonstrate smearing of the I-V curves near the threshold field. With approaching the Peierls transition temperature, T_P, the smearing evolves into smooth growth of conductance from zero voltage interpreted by us as t…
We formulate the problem of adsorption onto the surface of a carbon nanotube as a lattice gas on a triangular lattice wrapped around a cylinder. This model is equivalent to an XXZ Heisenberg quantum spin tube. The geometric frustration due to wrapping leads generically to four magnetization plateaus, in contrast to th…
Near-field microwave microscopy has created the opportunity for a new class of electrodynamics experiments of materials. Freed from the constraints of traditional microwave optics, experiments can be carried out at high spatial resolution over a broad frequency range. In addition, the measurements can be done quantita…
A continuum model for growth of solids is developed, considering adatom deposition, surface diffusion, and configuration dependent incorporation rate. For amorphous solids it is related to surface energy densities. The high adatom density leads to growth enhanced dynamics of (a) Mullins' classical equation [J. Appl. P…