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。
In this paper, the dynamic stability of single- and double-walled carbon nanotubes (SWCNT and DWCNT) under dynamic axial loading is investigated using the continuum mechanics model and the minimum total energy method. The natural frequencies of the SWCNT and the critical dynamic axial load of the SWCNT and DWCNT are o…
Photoinduced electron transfer processes in self-assembled zinc porphyrin ( ZnP ) or zinc phthalocyanine ( ZnPc ) with semiconducting (7,6)- and (6,5)-enriched SWCNTs were investigated. To bind photosensitizers to SWCNTs, first, pyrene covalently functionalized with a phenylimidazole (Im-Pyr) entity was treated with S…
A series of axial phenoxy substituted octabutoxy silicon phthalocyanines bearing ethyl carboxylic ester and diethyl phosphonate groups have been prepared from the corresponding phenols in pyridine. Axial bis-hydroxy silicon phthalocyanine was prepared using an adaptation of a reported protocol [1, 2] from the octabuto…
Dialdehyde starch (DAS), a polymeric aldehyde derived from naturally occurring polysaccharide, was used as an additive to the collagen (COL) matrix in an effort to improve its physical and biological properties. The effects of DAS on the thermal stability of COL were characterized by differential scanning calorimetry.…
Simultaneous determination of ascorbic acid (AA), dopamine (DA), and uric acid (UA) based on the bipolymers of polyluminol and poly(3,4-ethylenedioxythiophene) has been successfully performed. The bipolymers can be easily deposited on electrode surface by electropolymerization of luminol and 3,4-ethylenedioxythiophene…
Abstract Nanocomposites based on isotactic polypropylene (PP) and nanosilica (SiO 2 ) were prepared using a co-rotating twin-screw extruder (TSE). The effect of operating variables, such as screw speed and screw configuration on the dispersion of nanosilica in the polymer matrix has been studied, using TEM imaging. Hi…
The pentanuclear Pt II porphyrazine compound [(PtCl 2 ) 4 LPt] (L = tetrakis-2,3-[5,6-di(2-pyridyl)pyrazino]porphyrazinato dianion), the mononuclear species [LPt] and the octacation [L′Pt] 8+ (neutralized by I- ions; L′ = L octaquaternized at the pyridine N atoms) were synthesized and characterized by IR/UV-visible sp…
Multiferroic BiFeO 3 –Bi 0.5 Na 0.5 TiO 3 thin films were synthesized on Pt/TiO x /SiO 2 /Si substrates by chemical solution deposition. When the amount of Bi 0.5 Na 0.5 TiO 3 exceeded 30 mol %, perovskite BiFeO 3 –Bi 0.5 Na 0.5 TiO 3 single phase thin films were successfully fabricated in the temperature range of 550…
Potassium sodium niobate (KNN)-based leadfree materials were prepared and their field-induced strain behaviors were investigated. Ceramic lead-free piezoelectric materials were prepared in bulk and fiber forms with 1 mol% CuO-added potassium sodium niobate K0.5Na0.5NbO3 and x = 7 mol% lithium-modified (K(0.5-x/2)Na(0.…
The formation of nanoparticles during the radiation-induced chemical reduction of silver ions, copper ions, and nickel ions in films based on poly(acrylic acid)-poly(ethylenimine) complexes are studied via electron microscopy. This approach allows preparation of composites containing nanoparticles that are randomly di…
Diatomáceas perifíticas em Potamogeton polygonus Cham. & Schltdl.: citações pioneiras para o Estado do Paraná. Realizou-se o estudo taxonômico das diatomáceas perifíticas associadas à macrófita aquática Potamogeton polygonus. Espécimes da macrófita foram coletados em fevereiro, maio e novembro/2005 e março/2006, e…
A microfabricated amorphous silicon nitride membrane-based nanocalorimeter is proposed to be suitable for an x-ray transparent sample platform with low power heating and built-in temperature sensing. In this work, thermal characterization in both air and vacuum are analyzed experimentally and via simulation. Infrared…
Experiments with a liquid metal alloy, Galinstan, are reported and show clear evidence of Alfvén wave propagation as well as resonance of Alfvén modes. Galinstan is liquid at room temperature and, although its electrical conductivity is not as large as that of liquid sodium or NaK, it has still been possible to study…
Abstract Manganese oxide nanoparticles are synthesized by a chemical vapor process using manganese(0) carbonyl as the precursor. The synthesis temperature of the materials is varied from 500 to 1500 °C at 200 °C intervals. These nanomaterials are characterized by X‐ray powder diffraction (XRD), transmission electron m…
Composites based on polymers with conductive fillers have been gaining more and more significant roles in a variety of technological domains and are in the research focus of numerous studies as a part of growing research trend. Natural polymers based on renewable materials with addition of chosen materials can be dire…
We performed first-principles theoretical calculations to examine the interactions between oxygen vacancy (V O ) and rare-earth (RE) elements in barium titanate (BaTiO 3 ), in order to clarify the mechanism of V O trapping by RE dopants, which affects the insulating reliability of BaTiO 3 -based multilayer ceramic cap…
It is a common finding that titanocene-derived precursors do not yield TiO2 films in ALD with water. For instance, ALD with Ti(OMe)4 and water gives 0.5 A/cycle, while TiCp*(OMe)3 does not show any growth (Me=CH3, Cp* = C5(CH3)5). This is apparently in contradiction with the computed reactivity of the ligands: the ene…
The shrinkage behaviors of BaTiO 3 ceramics in a nonisothermal process were quantitatively monitored to clarify the mechanism of two-step sintering. During the increase in temperature, shrinkage behaviors due to grain boundary diffusion, volume diffusion, and grain rearrangement were observed. From the analysis of the…
The exceptional properties of lead-based perovskite-type (ABO(3)) relaxor ferroelectrics are due to their structural inhomogeneities. At ambient conditions, the average structure is pseudocubic but rich in ferroic nanoregions too small to be directly studied by conventional diffraction analysis. However, combining in…
Barium titanate (BaTiO 3 , BT)–potassium niobate (KNbO 3 , KN) (BT–KN) nanostructured ceramics with a distorted interface region, i.e., artificial morphotropic phase boundary (MPB) structure, were prepared by the solvothermal method. The results of the optimization of reaction conditions showed that the metastable reg…