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。
Metallic nanostructures attract much interest as an efficient media for surface-enhanced Raman scattering (SERS). Significant progress has been made on the synthesis of metal nanoparticles with various shapes, composition, and controlled plasmonic properties, all critical for an efficient SERS response. For practical…
Blue belt: Condensation polymerization of pyrene (blue) and triphenylene (green) monomers leads to the formation of a hexagonal mesoporous covalent organic framework (see picture). This material exists in a belt shape, absorbs photons over a wide wavelength range to emit them as blue luminescence, and is semiconductin…
Reflectance and transmittance of graphene in the optical region are analyzed as a function of frequency, temperature, and carrier density. We show that the optical graphene properties are determined by the direct interband electron transitions. The real part of the dynamic conductivity in doped graphene at low tempera…
Silver nanoparticles (AgNP) are likely to enter the aquatic environment because of their multiple uses. We have examined the short-term toxicity of AgNP and ionic silver (Ag+) to photosynthesis in Chlamydomonas reinhardtii using fluorometry. AgNP ranged in size from 10 to 200 nm with most particles around 25 nm. As de…
Nanomaterials (NM) exhibit novel physicochemical properties that determine their interaction with biological substrates and processes. Three metal oxide nanoparticles that are currently being produced in high tonnage, TiO(2), ZnO, and CeO(2), were synthesized by flame spray pyrolysis process and compared in a mechanis…
The crystal structure of PA5185, a putative thioesterase from Pseudomonas aeruginosa strain PAO1, was solved using multi-wavelength anomalous diffraction to 2.4 Å. Analysis of the structure and information about the putative function of the protein were used to optimize crystallization conditions. The crystal growth w…
Multi-color electrochromic (EC) device was fabricated on a patterned ITO glass. Organic electrochromic dyes were encapsulated within nano-sized porous TiO2 nanoparticles, and their relative electrochromic (EC) properties were determined using spectroelectrochemical method. Blue, green, and red colored organic dye dope…
Anti-Reflective (AR) thin film coatings of SiO₂ (n=1.48) and TiO₂ (n=2.17) were deposited by ion-beam assisted deposition (IBAD) with End-Hall ion source and conventional electron beam (e-beam) evaporation to investigate the effect of deposition method on the refractive indicies (n) of the films. Green-light generatio…
The long time of twenty years has passed since Diesel Particulate Filter (DPF) was proposed before the practical use. The main factors that DPF has been put to practical use in this time, are the same time proposal of the evaluation method of SiC porous materials linked to the performance on the vehicle, and that the…
Colloidal solutions of crystalline PbSe nanoparticles have been synthesized by hot solution chemical process using PbO in oleic acid and tributylphosphine (TBP) bonded selenium. The use of TBP as a capping agent along with oleic acid gives a very good yield (around 10% at 180 <TEX>${^{\circ}C}$</TEX>) with an average…
Porous carbon materials synthesized from various plant derived precursors i.e. seeds of [Castor (Ricinus communis), Soap nut (Sapindus sp.), Cashew-nut (Semecarpus anacardium), Jack fruit (Artocarpus heterophyllus), Safflower (Carthamus tinctorius), Ambadi (Crotolaria juncea), Neem (Azadirachta indica), Bitter Almond…
This study examined the feasibility of the combining HDDR-process (hydrogenation, disproportionation, desorption and recombination) with mechanical milling to prepare single domain <TEX>$Nd_2Fe_{14}B$</TEX> particles from a Nd-Fe-B alloy ingot. The <TEX>$Nd_{15}Fe_{77}B_8$</TEX> alloy was HDDR-treated and then subject…
Abstract Aqueous solutions used for the synthesis of MoVTeNb oxide catalysts have been studied with 125 Te, 95 Mo, 51 V, and 17 O NMR spectroscopy. Polyoxometalate (POM) anion V 9 TeO 28 5– ( I ), which has the decavanadate structure, containing Te 6+ in one of its two central positions, has been identified for the fi…
Manganin piezo-resistive gauges mounted in an insulating layer of thickness typically 100 µm, oriented perpendicular to the wave front, may in principle be used to measure lateral stresses in a shocked metal sample. However, high resolution simulations strongly suggest that the layer can perturb the stress field in th…
We present first-principles calculation of Mn-doped silicon nanowires. We discuss the energetics of both isolated point defects and Mn dimers, where a different behavior of the magnetization vs doping curve is predicted depending on the type of impurity. As a result of the broadening of the band gap, the range of dopi…
Using the static analytical method, the solubilities of 1,3,5-benzenetricarboxylic acid and 1,3-benzenedicarboxylic acid in binary acetic acid (2) + water (3) solvent mixtures have been measured. The experimental temperature ranged from (303.2 to 363.2) K, and the mole fraction of acetic acid in the solvent mixtures r…
Ordering of localized electronic states in multiferroic TbMnO3: a soft x-ray resonant scattering study, Forrest, T R, Bland, S R, Wilkins, S B, Walker, H C, Beale, T A W, Hatton, P D, Prabhakaran, D, Boothroyd, A T, Mannix, D, Yakhou, F, McMorrow, D F
Powdered samples of a variety of compositions of the off-stoichiometric magnetic shape memory alloy Ni 2 MnGa have been prepared by mechanical alloying from elemental precursors. As-milled powders are highly disordered and show very weak ferromagnetic order. Annealing produces a well-ordered L2 1 Heusler phase with hi…
International audience
In earlier work we reported the discovery of phase transitions in BiFeO 3 evidenced by divergences in the magnon light-scattering cross-sections at 140 and 201 K (Singh et al 2008 J. Phys.: Condens. Matter 20 252203) and fitted these intensity data to critical exponents α = 0.06 and α' = 0.10 (Scott et al 2008 J. Phys…