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 dielectric, ferroelectric and piezoelectric properties of bismuth potassium titanate, (Bi 1/2 K 1/2 )TiO 3 (BKT), ceramics were studied. Single-phase BKT ceramics with a high relative density of 97% were obtained by the hot pressing (HP) method. The resistivities of BKT ceramics hot-pressed at 1060 and 1080°C (her…
We study the effect of thiols on the emission efficiency of aqueous CdSe/ZnS core/shell nanocrystal quantum dots (NQDs). We observe that the impact of thiol addition on emission quantum yields (QYs) is time-, concentration-, and pH-dependent. Further, we use a combination of time-resolved spectroscopic methods to dete…
To better understand the relationship between atomic-scale structures and densities of aluminosilicate glasses and liquids, we used 27 Al MAS NMR to determine the speciation of aluminum ions in K 3 AlSi 3 O 9 , Na 3 AlSi 3 O 9 , and Ca 3 Al 2 Si 6 O 18 glasses quenched from melts at 3 to 10 GPa. These data are a first…
We show that spinoadal decomposition phase in dilute magnetic semiconductors (DMS) offers the possibility to have high Curie temperatures ( T C ) even if the magnetic exchange interaction is short ranged. The spinodal decomposition is simulated by applying the Monte Carlo method to the Ising model with realistic ( ab…
Abstract Molecular hybrid materials formed from polyoxometalates dispersed in conducting polymers represent an innovative concept in energy storage. This work reports in detail the first practical realization of electrodes based on these materials for energy storage in electrochemical supercapacitors. The molecular hy…
Abstract Films of liquid‐crystal networks with a splayed molecular alignment over their cross‐section display a well‐controlled deformation as a function of temperature. The deformation can be explained in terms of differences in thermal expansion depending on the average molecular orientation of the mesogenic centers…
In a previous work (Morgan and London 1996), we proposed an optimized procedure for electron microprobe analysis (EMPA) of rhyolitic glasses using a broad (20 μm diameter), low-current (2 nA) fixed beam. Some important applications for EMPA of glass, such as vitreous inclusions in minerals and experimental run product…
In microrheology, elastic and viscous moduli are obtained from measurements of the fluctuating thermal motion of embedded colloidal probes. In such experiments, the probe motion is passive and reflects the near-equilibrium (linear response) properties of the surrounding medium. By actively pulling the probe through th…
Vertically oriented single-crystalline Co3O4 nanowalls (see Figure) have been successfully fabricated by directly heating Co foil in air using a hot plate. The morphologies of the Co3O4 nanowalls can be controlled by varying the growth temperature and time. The Co3O4 nanowalls show promising field-emission performance…
Ultrafine-grained materials may be produced by applying severe plastic deformation, but these materials generally exhibit high strength and limited ductility. This report describes a technique for producing high strength and high ductility (see Figure) in precipitation-hardened alloys at ambient temperatures based on…
In the applications of single-walled carbon nanotubes (SWNTs), it is extremely important to separate semiconducting and metallic SWNTs. Although several methods have been reported for the separation, only low yields have been achieved at great expense. We show a separation method involving a dispersion-centrifugation…
Uniform and monodisperse CuO nanorods have been synthesized by directional aggregation and crystallization of tiny CuO nanoparticles generated from a solid-liquid arc discharge process under ambient conditions in the absence of any surfactants. Uniform CuO nanorods with sharp ends are formed from tiny nanoparticles vi…
PEDOT nanorods have been fabricated using reverse cylindrical micelle-mediated interfacial polymerization without any templates and applied as chemical sensors for the detection of HCl and NH3 vapor. The PEDOT nanorods, shown in the Figure, display very stable conductivity. The chemical sensors can detect low vapor co…
Gold clusters (Au55) have been shown to interact with DNA (see image). Armed with this knowledge, experiments have shown that such clusters are shown to have significant toxicity towards many types of human cells, both healthy and cancerous, in contrast to previously studied larger gold nanoparticles. It is hoped, the…
For tetragonal barium titanate (BaTiO3) single crystals, an electric field (E-field) applied along the [111]c direction can induce an engineered-domain configuration in these crystals. In this study, such engineered-domain configurations of different domain sizes were induced in BaTiO3 single crystals, and their piezo…
We modified the surface of electrospun poly(caprolactone) (PCL) nanofibers to improve their compatibility with endothelial cells (ECs) and to show the potential application of PCL nanofibers as a blood vessel tissue-engineering scaffold. Nonwoven PCL nanofibers (PCL NF) and aligned PCL nanofibers (APCL NF) were fabric…
A well-ordered mesoporous carbon nitride material has been prepared by the polymerization reaction between ethylenediamine and carbon tetrachloride. This material has a highly ordered hexagonal pore system (see Figure), a high surface area, a large pore volume, and a uniform mesopore size distribution. Potential appli…
Abstract Examples of gold and silver anisotropic colloids, such as prisms and rods, have appeared in the literature for many years. In most cases, the morphologies of these thermodynamically unfavorable particles have been explained by the particular reaction environment in which they were synthesized. The mechanisms…
Abstract Silk fibers have outstanding mechanical properties. These fibers are insoluble in organic solvents and water, are biocompatible, and exhibit slow biodegradation in vitro and in vivo due to the hydrophobic nature of the protein and the presence of a high content of β‐sheet structure. Regenerated silk fibroin c…
An ideal composite film based on a carbon nanotube (CNT) array for thermal management applications is prepared using “in-situ injection molding”. The aligned CNTs with their tips protruding out of both surfaces form ideal thermal conducting paths between surfaces. Much better thermal conductivity improvements can be a…