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 theory of nuclear magnetic resonance (NMR) in graphene is presented. The canonical form of the electron-nucleus hyperfine interaction is strongly modified by the linear electronic dispersion. The NMR shift and spin-lattice relaxation time are calculated as a function of temperature, chemical potential, and magnetic…
One-dimensional MgZnO nanostructures were grown directly on p-Si substrates by thermal evaporation at a variety of synthesis temperatures. Transmission electron microscopy and energy dispersive x-ray spectroscopy analysis revealed the formation of slim ZnO nanowires with twin boundaries on low Mg content nanosheets at…
Abstract The inhibitive effect of some amino acids, glycine (Gly), alanine (Ala), valine (Val), leucine (Leu), isoleucine (Ile), serine (Ser), threonine (Thr), methionine (Met), phenylalanine (Phe), tyrosine (Tyr), trytophan (Try), aspartic acid (Asp), asparagine (Asn), glutamic acid (Glu), and lysine (Lys) against th…
During poling and application in actuators, piezoelectric ceramics like lead-zirconate-titanate are exposed to static or cyclically varying electric fields, often leading to pronounced changes in the electromechanical properties. These fatigue phenomena depend on time, peak electric load, and temperature. Although thi…
Spectroscopic properties of Er3+/Yb3+ codoped barium gallogermanate glass demonstrate that an efficient energy transfer from Yb3+ to Er3+ ions occurs while the back energy transfer from Er3+ to Yb3+ ions cannot be ignored. Based on the rate equations of electron transitions, the forward energy transfer Yb3+(F25/2)+Er3…
Electrospun polyacrylonitrile (PAN) fiber precursor-based carbon nanofiber (CNF) mats were produced and impregnated with epoxy resin. The mechanical properties of as-prepared nanofibers in the mat and short fiber filled epoxy nanocomposite forms were determined to demonstrate the effect of fiber aspect ratio on those…
BACKGROUND: Targeted magnetic resonance contrast agents have enabled the imaging of biological processes in vivo, and current insights have opened up new perspectives for the monitoring and diagnosis of many diseases. PURPOSE: To develop a contrast agent for targeting somatostatin receptors (SSTRs) expressed on breast…
This paper deals with the analysis of nanoparticles polymerized in nitrogen/acetylene and argon/acetylene gas mixtures in low temperature rf discharges. The polymerization process was monitored by means of mass spectroscopy. The chemical characteristics of the material were obtained in situ by infrared absorption spec…
Abstract The corrosion and electrochemical behaviors of pure aluminum in KOH‐ionic liquid‐water solutions with variable volume ratios of water and the ionic liquid 1‐butyl‐3‐methyl imidazolium tetrafluoroborate (BMIMBF 4 ) were for the first time investigated by means of hydrogen collection, polarization curve, galvan…
Rare earth doped opaque aluminum tellurite ceramics exhibiting multicolor upconversion and color tunability have been synthesized and characterized. The multicolor fluorescence comprises of green, red, and blue upconversion emissions from Ho3+ and Tm3+ ions. By varying the intensity ratios between the upconversion emi…
Materials based on rare-earth and iron have drawn much attention due to their high performance properties for permanent magnet application. Substitution of Fe by a transition metal remains of considerable interest owing to the relatively modest magnetic properties of the binary Sm–Fe compounds. The structure of the na…
Abstract [C 4 mim][Tb(hfacac) 4 ] ( 1 ) and [C 4 mpyr][Tb(hfacac) 4 ] ( 2 ) (C 4 mim = 1‐butyl‐3‐methylimidazolium, C 4 mpyr = N ‐butyl‐ N ‐methylpyrrolidinium) were obtained by reacting [C 4 mim]Cl (for 1 ) or [C 4 mpyr]Br (for 2 ) with (hexafluoroacetyl)acetone and terbium(III) chloride in a basic ethanol/water solu…
The electronic thermal transport in metallic nanofilms has been extensively studied. There are, however, rare reports on the influence of phonon on the thermal and electrical transports in metallic films. In the present work, equilibrium molecular dynamics with embedded-atom method is used to investigate the lattice t…
Stable configuration, electronic structures, and magnetic behaviors for S adsorption on graphene have been investigated by first-principles calculations. It is found that the adsorption site of S on graphene is coverage dependent. As the increase in coverage from 0 to 0.5 ML, the preferred site is changed from bridge…
We report on polarization-dependent transient carrier dynamics and coherent phonon oscillations in single-walled carbon nanotubes by determining the relation between the nanotube axis and the incident light polarization. Due to the anisotropic shape of nanotubes, optical absorption strongly depends on the polarization…
Photochromic unsymmetrical diarylethenes 1a–5a that bear different electron-donating or electron-withdrawing substitutes have been synthesized, and the structures of 2a–5a determined by single-crystal X-ray diffraction analysis. Substituent effects on their optoelectronic properties, including photochromism, fluoresce…
We have studied the fracture, strain, and stress of electrophoretically deposited (EPD) films of CdSe nanocrystals as a function of the film thickness, nanocrystal size, and drying method. Fracture results from the film stress that develops with the loss of residual solvent after EPD when the film exceeds a threshold…
We demonstrate an efficient and accurate first-principles method to calculate the electronic structure of a large system using a divide-and-conquer strategy based on localized quasi-atomic minimal basis set orbitals recently developed. Tight-binding Hamiltonian and overlap matrices of a large system can be constructed…
Abstract The creep behavior and creep failure law of polypropylene (PP) were investigated by using a multifunctional stress‐aging testing machine under different aging environmental conditions (temperature, UV, and stress). Photoinduced changes in samples were studied using gel permeation chromatography and X‐ray phot…
Abalone shell is natural inorganic/organic hybrid material, which is biologically constructed by using two calcium carbonates, aragonite and calcite. Aragonite can provide an enhanced mechanical support for the shell, and the stable phase, calcite, acts as the outer layer. In the current study, large-area aragonite fi…