A5027286063- Quantum Dots Synthesis And Properties
- ZnO doping and properties
- Chalcogenide Semiconductor Thin Films
- Perovskite Materials and Applications
- Copper-based nanomaterials and applications
- Nanoparticle-Based Drug Delivery
- Nanocluster Synthesis and Applications
- Coordination Chemistry and Organometallics
- Organometallic Complex Synthesis and Catalysis
- Gold and Silver Nanoparticles Synthesis and Applications
- Electronic and Structural Properties of Oxides
- TiO2 Photocatalysis and Solar Cells
- Academic Research in Diverse Fields
- Copper Interconnects and Reliability
- International Relations and Autism
- Electrochemical Analysis and Applications
- Porphyrin and Phthalocyanine Chemistry
- Carbon and Quantum Dots Applications
- Brazilian Legal Issues
- Ga2O3 and related materials
- Iron oxide chemistry and applications
- Gas Sensing Nanomaterials and Sensors
- Advanced Polymer Synthesis and Characterization
- Metal and Thin Film Mechanics
- High-Temperature Coating Behaviors
University of Aveiro
2006-2017
Centre National de la Recherche Scientifique
2004-2005
Institut de Neurobiologie de la Méditerranée
2005
École Nationale Supérieure de Chimie de Lille
2005
Université de Bourgogne
2004-2005
Highly stereospecific polymerization of isoprene was achieved using borohydridoneodymium complexes. In combination with stoichiometric amounts dialkylmagnesium, Nd(BH4)3(THF)3 (1) and Cp*'Nd(BH4)2(THF)2 (2) (Cp*' = C5Me4nPr) afford very efficient catalysts. The activity reaches 37300 (g polyisoprene/mol Nd)/h. Half-lanthanidocene 2 gives rise to polyisoprene, 98.5% trans-regular, the highest content yet described for a homogeneous organometallic catalyst. NMR experiments argue formation...
We report the synthesis and characterization of colloidal nanocrystals consisting ZnO doped with Tb3+ cations. Introducing cations in nanosized hosts led to photoluminescent systems whose wavelength emission depends on excitation line. Chemical surface modification associated photoluminescence studies allows us conclude that are located core.
Abstract Summary: The neodymium trisborohydride Nd(BH 4 ) 3 (THF) (THF = tetrahydrofuran) has been used as a catalyst precursor for isoprene polymerization the first time. Associated to an excess of Al(Et) , resulting is moderately active, giving mixture cis ‐ and trans polymer. Addition stoichiometric amount MgBu 2 affords stereospecific providing ‐1,4‐polyisoprene, more than 96% regular. That dual component Nd/Mg system also shows better efficiency good control molecular weights. A...
Surface mediated phenomena are important in controlling the magnetism of nanocrystals. Here, we provide a versatile chemical method which allows formation EuS nanocrystals encapsulated poly(styrene) (PS). These materials first example polymer based nanocomposite prepared situ. Besides their practical interest, these general relevance because they allow fundamental knowledge on EuS, is commonly used as model an insulating ferromagnet, to be acquired. Comparatively starting powders (8 nm),...
Nanosized semiconductor particles are of great scientific and technological interest because their size-dependent electronic optical properties. Semiconductor nanocrystals have been investigated, for example, as nano-fillers diverse polymer matrices in order to produce new optically active materials. Here we report, the first time, results concerning preparation nanocomposites made ZnO (NCs) incorporated co-polymer poly-{trans-[RuCl2(vpy)4]/sty (sty = styrene vpy 4-vinylpyridine). In a step,...
A series of chemically prepared Co2+-doped ZnO colloids has been surface modified either by growing shells ZnSe or the in situ encapsulation poly(styrene). The modification effects using these two distinct chemical strategies on magnetic properties nanocrystals were probed electron paramagnetic resonance (EPR). Structural characterization means x-ray diffraction and transmission microscopy gave no evidence second phase formation within detection limits used equipment. EPR analysis was...
Abstract We report on the magnetic and structural properties of two types nanostructures doped with Co or Mn, namely, ZnO nanowires colloidal nanocrystals. Electron paramagnetic resonance (EPR) spectra have been measured analysed to extract information incorporation ions in lattice. A detailed analysis by means simulations experimental EPR confirms that transition metal (TM) were mainly incorporated as TM 2+ , occupying Zn sites wurtzite structure ZnO. Furthermore, for both nanostructures,...
We report a general method for the synthesis of metal oxide colloidal nanocrystals in sunflower oil using single-source precursors. In this research, iron have been synthesized and characterized though can be extended to other common oxides such as ZnO also types vegetable oils solvents. Using method, nanoparticles with average diameters 7 nm 3 were obtained respectively zinc oxide. The magnetic phase was identified powder XRD, surface enhanced Raman spectroscopy measurements maghemite main...
Cadmium chalcogenide quantum dots (QD’s) were synthesised using a single source approach while zinc oxide QD’s obtained by colloidal technique. In both situations the surface capped with tri-octylphosphine (TOPO) hence leading to nanodispersed systems in organic solvents such as toluene. The organically (CdSe, CdS and ZnO) used building-units fabricate LbL (layer-by-layer) films on glass quartz substrates. A linear increase visible light absorbance (due QD’s) number of deposited layers...
Objetivo: o objetivo deste trabalho é realizar uma revisão sistemática com intuito de identificar os fatores externos e compreender a sua influência no desenvolvimento do TEA. Metodologia: metodologia utilizada para essa foi por meio da seleção 10 artigos indexados na base dados online LILACS, Medline SciELO, utilizando seguintes descritores: “autism”, “triggering factors”, “teratogenesis” “environment”. Resultados: soma como idade dos pais, complicações parto, uso substâncias pode estar...
A series of coordination compounds containing [Zn(amine)]2+ cationic complexes and alkyldithiocarbamates (RR'dtc-), as counter anions, are reported here: [Zn(amine)x][RR'dtc]2, where amine = ethylenediamine (en), diethylenetriamine (dien), 1,2-diaminopropane (dap) and, R,R' ethyl (Et); butyl (Bu) methyl (Me), hexyl (Hex). Hybrid nanoplates composed hexagonal-ZnS nanoparticles organic components were obtained after solution phase thermolysis such precursors in oleylamine. These hybrid...