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。
Well-ordered 2-D polyaniline (PAni) honeycomb films were produced by electropolymerization of aniline within the interstitial voids in assemblies of polystyrene (PS) nanospheres precoated with poly(diallyldimethylammonium chloride) and poly(sodium 4-styrenesulfonate) (PDADMAC/PSS) thin shells, followed by the extracti…
The mechanism for NO 2 storage in barium oxide supported on magnesium oxide (BaO/MgO) was investigated. In situ Raman spectroscopy was used to follow temporal changes in the composition of the catalyst that occurred during the reaction with NO 2 . Up to catalyst temperatures of 400 °C, the formation of an intermediate…
Thin films of wide-gap p-type (LaO)CuS were prepared by rf sputtering followed by postannealing. Undoped (LaO)CuS films are electrically insulating and emit ultraviolet (UV) light arising from excitons at room temperature upon photoexcitation. The hole carrier concentration in the film was controlled in the range ∼101…
We have prepared Pt/SrBi2Ta2O9 (SBT)/Si metal-ferroelectric-semiconductor (MFS) and Pt/SBT/Y2O3/Si metal-ferroelectric-insulator-semiconductor (MFIS) ferroelectric gate structures and investigated the changes in memory window with different thickness of SBT and Y2O3 in the MFS and MFIS. As a result, it is found that t…
Abstract The barrier and mechanical properties of biodegradable melt‐mixed polyesteramide/octadecylamine‐treated montmorillonite clay (filler) have been studied. Extruded films containing 5 and 13 wt% filler were prepared by melt‐mixing. Samples compression molded after extrusion was also studied. Oxygen and water tra…
Well-aligned carbon nitride nanotubes are fabricated by microwave plasma assisted chemical vapor deposition using iron as the catalyst. These nanotubes are linearly polymerized by carbon nitride nanobells with catalyst particles in the root, as revealed by high-resolution transmission electron microscopy. Carbon nitri…
Porous Y 2 O 3 ‐stabilized ZrO 2 (YSZ) samples were synthesized by preparing NiO/YSZ composites by tape casting and calcining at 1800 K, reducing the NiO to nickel in H 2 at 973 K, and finally leaching the nickel out of the structure with 2.2 M HNO 3 at 353 K. Porous YSZ was prepared from NiO/YSZ composites containing…
The purpose of this report is to describe the appropriate use of indices relating to crystallinity, such as the ‘crystallinity index’, the ‘Hinckley index’, the ‘Kübler index’, and the ‘Árkai index’. A ‘crystalline’ solid is defined as a solid consisting of atoms, ions or molecules packed together in a periodic arrang…
Abstract X‐ray diffraction methods and DSC thermal analysis have been used to investigate the structural change of nylon 6/clay nanocomposites. Nylon 6/clay has prepared by the intercalation of ε‐caprolactam and then exfoliaton of the layered saponite or montmorillonite by subsequent polymerization. Both X‐ray diffrac…
Protein serine/threonine phosphatase (PP) 2A is a ubiquitous enzyme with pleiotropic functions. Trimeric PP2A consists of a structural A subunit, a catalytic C subunit, and a variable regulatory subunit. Variable subunits (B, B', and B" families) dictate PP2A substrate specificity and subcellular localization. B-famil…
We hypothesize that the shift of the glass transition temperature of polymers in confined geometries can be largely attributed to the inhomogeneous density profile of the liquid. Accordingly, we assume that the glass temperature in the inhomogeneous state can be approximated by the Tg of a corresponding homogeneous, b…
Bi 0.5 (Na 1‐ x K x ) 0.5 TiO 3 (BNKT) bulk ceramics with a preferred <100> orientation were prepared using the reactive templated grain‐growth method with platelike Bi 4 Ti 3 O 12 particles as templates for BNKT. The potassium concentration ( x value) had a large effect on the degree of orientation, and highly…
The slow dynamics (10 −6 s–10 4 s) of the magnetization in the paramagnetic phase, predicted by Glauber for the 1d Ising model, has been observed with ac susceptibility and SQUID magnetometry measurements in a molecular chain comprising alternating Co 2+ spins and organic radical spins strongly antiferromagnetically c…
Dynamics in the production of extracellular polymeric substances (EPS) were investigated for the benthic diatoms Cylindrotheca closterium (Ehrenberg) and Nitzschia sp. The effect of growth phase and light:dark conditions were examined using axenic cultures. Two EPS fractions were distinguished. Soluble EPS was recover…
The primary damage formation in Mo is investigated using molecular dynamics (MD) simulation with embedded-defect (ED) and embedded-atom method (EAM) interatomic potentials. The former is similar in spirit to the latter but includes an approximate treatment of bond directionality in the many-body interaction. MD simula…
This paper reports on a study of the transient optical absorption exhibited by Li 2 B 4 O 7 (LTB) in the visible and UV spectral regions. Using absorption optical spectroscopy with nanosecond time resolution, it is established that the transient optical absorption (TOA) in these crystals originates from optical transi…
The role of delocalization and hybridization in complex magnetic oxides has been investigated by magnetic oxygen K -edge absorption of circular polarized soft X-rays in epitaxial grown CrO 2 as a function of the azimuthal angle at grazing incidence. Unusual strong variations in the typically small X-ray magnetic circu…
In this paper, we present the results of a study on pure silica fibers where both the spectral and kinetic behavior are explored during irradiation in spent fuel gamma facilities. Basic kinetic models are considered, as they provide insight into fundamental dependencies on temperature and dose-rate. Other popular mode…
Foamed propellants based on polymer bonded nitramines show high conversion rates due to their porous structure. The properties of the material can be varied in a wide range by using different explosive fillers, energetic binders and porous structures. Foamed propellants with high energy content and variable burning an…
Infrared spectra of synthetic, semicrystalline aluminosilicates in the region 500–1200 cm −1 show a dominant band due to Si–O stretching at 980–1030 cm −1 and two combined bands due to Si–O–Al bending at 600–700 cm −1 . These bands can be used to determine quantitatively the Si/Al ratio of the aluminosilicates. A cali…