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。
pi-Conjugated molecules are interesting components to prepare fluorescent nanoparticles. From the use of polymer chains that form small aggregates in water to the self-assembly of small chromophoric segments into highly ordered structures, the preparation of these materials allows to develop systems with applications…
Over the past decade intensive research efforts have been carried out by researchers around the globe on exploring the effects of dilute doping of magnetic impurities on the physical properties of functional non-magnetic metal oxides such as TiO(2) and ZnO. This effort is aimed at inducing spin functionality (magnetis…
The oxidation of carbon monoxide by oxygen using two catalysts prepared by two different methods has been investigated. In the first method, catalyst prepared by immersing γ-Al2O3 into the hexa-chloroplatinic acid solution at 80oC for 4 h, resulted Pt/γ-Al2O3 catalyst having platinum highly dispersed on the support. W…
Abstract In the current work, transient features of initiation in a gas‐liquid pneumatic foam are investigated by measuring the evolution of volumetric liquid fraction as a function of height within the column. The addition of wash water to a flotation froth is only effective when the foam liquid fraction has reached…
A hybrid silica/epoxy nanocomposite film containing boehmite nanoparticles has been developed in this work through the sol–gel method to protect AA2024 alloy from corrosion. The hybrid sols were prepared by copolymerisation of 3-glycidoxypropyltrimethoxysilane, tetraethylorthosilicate and aluminium isopropoxide. The f…
The response time and contrast of vertically-aligned negative nematics depend critically on the aligning surface and its induced pretilt. Pretilt can be tuned up using obliquely evaporated inorganic oxides as alignment surface. A thorough study of pretilt angles induced by aligning surfaces of thermally evaporated SiO…
We have investigated transition behavior for block copolymer (BCP) mixtures composed of a lamella-forming polystyrene- block -poly(2-vinylpyridine) (PS- b -P2VP) and phenylacetamide derivatives, where the hydroxyl functionality at phenylacetamide unit is available only for 4-hydroxyphenylacetamide (HPA) and not for ph…
In order to assess the possibility to follow surface reactions in a quantitative way by vibrational spectroscopy, a combination of temperature programmed reaction spectroscopy (TPRS) and reflection absorption infrared spectroscopy (RAIRS) has been used to study the decomposition of NO and the reaction between NO and C…
Abstract High rate of gas production from a well may result in brine production from different formations. When incompatible brines with different degree of saturation are mixed, precipitation of the salt could plug the well. Evaluation of openhole section was performed on a well in a gas field in Iran to check the we…
Nanoheterogenous ultrathin films containing perfluorinated domains were prepared via the layer-by-layer (LbL) electrostatic self-assembly method. The films are constructed from the amphiphilic cationic copolymer with perfluorinated side chains and poly(sodium styrenesulfonate) (PSS). The LbL process was optimized by t…
We predict the pseudoelasticity of the $⟨100⟩/{100}$ copper nanowire using atomistic simulations with the embedded atom method potential under uniaxial compressive loading. The $⟨100⟩/{100}$ copper nanowire exhibits pseudoelasticity which depends on the reorientation of the crystalline structure of the nanowire due to…
Single-walled carbon nanotubes (SWNT) with encapsulated nanosized cobalt particles have been synthesized by a facile and scalable method. In this approach, SWNT were filled with a cobalt acetylacetonate solution in dichloromethane by ultrasonication. In a second step, exposure to hydrogen at different temperatures rel…
Abstract We investigated the mechanical and physical characteristics of composites composed of polyacetal [alternatively called polyoxymethylene (POM)] and cellulose fiber (CelF) derived from wood pulp [10–52 wt % (9.3–50.1 vol %)] without any fiber surface treatment. The modulus, deflection temperature under load, an…
Time-resolved optically stimulated luminescence (TR-OSL) curves from quartz are usually measured over a few hundred microseconds because this time range best illustrates the main component in quartz which lies in the range 30–45 µs. In this study we present the decay form of quartz TR-OSL and optically stimulated phos…
We studied an orthorhombic-to-rhombohedral transformation of AgGaO 2, which was performed in water at low temperature and accompanied by morphology variation, by using powder X-ray diffraction, UV−visible absorption spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy, and photocatalytic…
Abstract The inelastic mean free path (IMFP), surface excitation parameter (SEP), and differential SEP (DSEP) were determined for 10 elemental solids by the absolute analysis of reflection electron energy loss spectra (REELS). The obtained IMFPs were compared with values calculated using predictive equations for the I…
Abstract We report on Förster‐type nonradiative resonance energy transfer (NRET) directed from colloidal quantum dots (QDs) to epitaxial quantum wells (QWs) with an efficiency of 69.6% at a rate of 1.527 ns –1 for potential application in III‐nitride based photovoltaics. This hybrid exciton generation–collection syste…
Single-site Re nanoparticles were produced by anchoring dirhenium organometallic clusters on to the inner walls of mesoporous silica. The presence of oxophilic atoms (Sb or Bi) is essential to obtain well dispersed Re(0) centers. The interaction between the organometallic cluster and the silica support is critical for…
The lowest-energy electronic excited states of ZnO quantum dots containing 1−3 Mn 2+ ions have been studied by time-dependent density functional theory. The calculations show that these excited states involve holes with predominantly manganese 3d character and electrons delocalized in conduction-band-like orbitals, co…
Carbon nanotubes were subjected to doping with an energetic Ag ion beam, and the carbon nanotubes on the top of the array were transformed into amorphous carbon nanowires with embedded Ag-nanoparticles. The field emission characteristics of these nanowires were investigated. The minimum turn-on and threshold fields we…