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。
Our recent studies have demonstrated that mechanical fractionation of tissue structure with sharply demarcated boundaries can be achieved using short (< 20 micros), high intensity ultrasound pulses delivered at low duty cycles. We have called this technique histotripsy. Histotripsy has potential clinical applications…
We have developed highly refractive and transparent polyimides (PIs). The PIs were prepared from a newly developed meta -substituted sulfonyl-bridged dianhydride, 4,4‘-[ m -sulfonylbis(phenylenesulfanyl)]diphthalic anhydride (DPSDA), and various sulfur-containing aromatic diamines, including 4,4‘-thiobis[( p -phenylen…
Olive-green cobalt(III) complexes having the general formula Co4O4(O2CMe)4L4 (1) where L = py (1a), 4-Mepy (1b), 4-Etpy (1c), and 4-CNpy (1d) have been prepared by the H2O2 oxidation of a mixture of Co2+, MeCO2-, and pyridine or 4-substituted pyridines in a 1:2:1 molar ratio in methanol. Spectroscopic and X-ray crysta…
Great balls of fiber! Annealing of a dilute aqueous solution of poly(2-isopropyl-2-oxazoline) above its cloud point leads to the formation of a coagulate in the form of crystalline nanofibers (see microscopy image). Directional crystallization, which occurs below the glass transition temperature of the polymer at 65 °…
Preparation of highly porous (up to 80% pore volume) open-cellular monolithic cross-linked polymers from 2-hydroxyethyl methacrylate is reported. Oil-in-water and water-in-oil high internal phase emulsions are applied as porosity templates, resulting in an interconnected porous structure with void diameters between 55…
A full-wave analysis technique based on the finite element-boundary integral method is developed and used to rigorously treat the scattering from periodically structured metamaterials incorporating anisotropic liquid crystals (LCs) and dispersive materials. Reconfiguration of the negative-index metamaterials is achiev…
We studied the interaction of perfect and lightly reduced ceria (111) surfaces with hydrogen and water molecules using density functional calculations implementing the generalized gradient approximation (GGA) and on-site Coulomb interactions (GGA+U). We predicted the relative surface energies at different states of re…
Screen/stencil-printable nanosilver pastes were processed and characterized for die-attaching SiC devices. The nanosilver pastes were made by mixing silver particles in diameter with an organic binder vehicle. For the die-attachment, the nanosilver pastes were printed onto silver-coated or gold-coated direct-bond-copp…
Cubic shaped Magnesium oxide nanoparticles were successfully synthesized by sol-gel method using magnesium nitrate and sodium hydroxide at room temperature. Hydrated Magnesium oxide nanoparticles were annealed in air at 300 and 500°C. X-ray diffraction patterns indicate that the obtain nanoparticles are in good crysta…
We prepared controlled-polydispersity poly(ethylene- alt -propylene)- b -poly( dl -lactide) (PL) and polystyrene- b -polyisoprene (SI) block copolymers to study the effects of the molecular weight distribution on the order−disorder transition at controlled composition and overall molecular weight. Small-angle X-ray sc…
Abstract ChemApp is a thermochemical software library which enables the user to perform thermochemical calculations across a wide spectrum of applications by providing an easily programmable interface to complex equilibrium calculation techniques for multicomponent, multiphase chemical systems. ChemApp is described, a…
The stator insulation breakdown is a major cause of ac machine failures. Ground insulation defaults are easily detected by classical systems based on leakage current measurements, however the turn-to-turn insulation degradations are more difficult to detect. For large machines, on-line methods, based on partial discha…
Charge density and magnetization density profiles of one-dimensional metals are investigated by two complementary many-body methods: numerically exact (Lanczos) diagonalization, and the Bethe-Ansatz local-density approximation with and without a simple self-interaction correction. Depending on the magnetization of the…
Relaxor ferroelectric PbMg1/3Ta2/3O3 ceramics and thin films were investigated by means of broad-band dielectric, time-domain terahertz (THz), and Fourier-transform infrared (IR) spectroscopy in the frequency range 100 Hz–90 THz at temperatures 100–490 K; the THz and IR spectra were studied from 20 to 900 K. A diffuse…
Signal formation mechanism in piezoresponse force microscopy (PFM) of piezoelectric surface layers and thin films on rigid and elastically matched substrates with different dielectric properties is analyzed and compared. This analysis provides the extension of recent studies of clamping effects in thin films in unifor…
Gold nanocages represent a novel class of biocompatible vectors with potential applications in drug delivery, tumor/tissue imaging and photothermal therapy. They are prepared through the galvanic-replacement reaction between Ag nanostructures and HAuCl(4). By controlling the amount of HAuCl(4) added, we can tune the s…
A comprehensive review of the structure‐morphology‐property relations in segmented thermoplastic elastomers (STPE) prepared by the stoichiometric reactions of soft segment oligomers and hard segment precursors is provided. Although the main focus of this study is on linear, segmented, thermoplastic polyurethanes and p…
The deformation, recrystallisation and texture of three magnesium alloy extrusions, AZ31, WE43 and ZC71, have been investigated. The extruded microstructures were partially recrystallised; the nucleation of new grains was associated with boundaries, deformation features and second phase particles. The unrecrystallised…
Composite insulators are considered mature products and a broad range of insulator types is nowadays available, including line insulators, hollow-core insulators and apparatus insulators, for applications ranging from distribution voltages to the highest transmission voltages. This development has created a need to el…
Using molecular dynamics (MD) simulations, we show that metal−organic frameworks (MOFs) constructed using octahedral Zn 4 O(CO 2 ) 6 clusters linked via aromatic carbon ring structures lead to negative thermal expansion (NTE) behavior (from 0 K to melting). We find that MOF-C22 contracts volumetrically by 1.9% over th…