Encontrados 26 documentos, a visualizar página 1 de 3
Functionalization of nickel nanowires with a fluorophore aiming at new probes f...
Pinheiro, Paula C.; Sousa, Célia T.; Araujo, João P.; Guiomar, A. J.; Trindade, TitoThis work reports research on the development of bimodal magnetic and fluorescent 1D nanoprobes. First, ferromagnetic nickel nanowires (NiNW) have been prepared by Ni electrodeposition in an anodic aluminum oxide (AAO) template. The highly ordered self-assembled AAO nanoporous templates were fabricated using a two-step anodization method of aluminum foil. The surface of the NiNW were then modified with polyethy...
Integrated synthesis of nanosized semiconductors in a bioremediation system for...
Costa, J. P. da; Girão, Ana Violeta; Lourenço, J. P.; Monteiro, O. C.; Trindade, Tito; Costa, Maria ClaraThe use of sulfate-reducing bacteria in bioremediation process for the treatment of afluents with high-content of sulfate and metal generates an excess of sulfide.
Functionalization of nickel nanowires with a fluorophore aiming at new probes f...
Pinheiro, Paula C.; Sousa, Célia T.; Araújo, João P.; Guiomar, António J.; Trindade, TitoThis work reports research on the development of bimodal magnetic and fluorescent 1D nanoprobes. First, ferromagnetic nickel nanowires (NiNW) have been prepared by Ni electrodeposition in an anodic aluminum oxide (AAO) template. The highly ordered self-assembled AAO nanoporous templates were fabricated using a two-step anodization method of aluminum foil. The surface of the NiNW were then modified with polyethy...
Supported ionic liquid silica nanoparticles (SILnPs) as an efficient and recycl...
Sidhpuria, Kalpesh B.; Daniel-da-Silva, Ana L.; Trindade, Tito; Coutinho, João A. P.Supported ionic liquid nanoparticles (SILnPs) having particle size ranging from 293 ± 2 to 610 ± 11 nm have been prepared by immobilization of ionic liquid, 1-(tri-ethoxy silyl-propyl)- 3-methyl-imidazolium hydrogen sulfate (IL-HSO4) on the surface of silica nanoparticles. The catalytic activity of the prepared SILnPs was investigated for the dehydration of fructose to 5-hydroxymethylfurfural (HMF) in the prese...
Synthesis, characterisation and luminescent properties of lanthanide-organic po...
Girginova, Penka I.; Paz, Filipe A. Almeida; Soares-Santos, Paula C. R.; Ferreira, R. A. Sá; Carlos, Luís D.; Amaral, Vítor S.; Klinowski, JacekThree new lanthanide(III) complexes (Ln = Sm, Tb and Eu) of picolinic and glutaric acid were prepared and characterised. The crystal structure of the complex [Sm(glu)(pic)- (H2O)2] (where Hpic and H2glu stand for picolinic and glutaric acid, respectively) was determined by single-crystal Xray diffraction. All the Ln complexes were characterised by elemental analysis, infrared spectroscopy, X-ray powder diffract...
Luminescent polyoxotungstoeuropate anion-pillared layered double hydroxides
Sousa, Filipa L.; Pillinger, Martyn; Ferreira, Rute A. Sá; Granadeiro, Carlos M.; Cavaleiro, Ana M. V.; Rocha, João; Carlos, Luís D.; Trindade, TitoNovel luminescent polyoxometalate anion-pillared layered double hydroxides (LDHs) were prepared by aqueous ion exchange of a Zn–Al LDH precursor in nitrate form with the europium-containing polyoxotungstate anions [EuW10O36]9–, [Eu(BW11O39)(H2O)3]6– and [Eu(PW11O39)2]11–. The host– guest interaction has a strong influence on the nature of the final intercalated species, as evidenced by elemental analy- Introduc...
Use of biogenic sulfide for the synthesis of CuS nanocrystals and nanocomposites
Pinto da Costa, João; Girão, Ana Violeta; Lourenço, J. P.; Monteiro, O. C.; Trindade, Tito; Costa, Maria ClaraDuring the metabolism of organic matter (CH2O), sulfate-reducing bacteria (SRB) use sulfate as the terminal electron acceptor, resulting in the production of H2S. This biologically generated sulfide, in the presence of metal ions, can be used for metal precipitation (Bhagat et al., 2004). The use of SRB in bioremediation processes, namely, in the reduction of highcontent sulfate and metal effluents, is well doc...
Shaping gold nanocomposites with tunable optical properties
Martins, Manuel A.; Fateixa, Sara; Girao, Ana V.; Pereira, Sergio S.; Trindade, TitoWe report the synthesis of morphological uniform composites using miniemulsions of poly(tert-butyl acrylate) or poly(styrene) containing organically capped gold nanocrystals (NCs). The optical features of such hybrid structures are dominated by plasmonic effects and depend critically on the morphology of the resulting nanocomposite. In particular, we demonstrate the ability to tune the overall optical response ...
Lanthanopolyoxotungstates in silica nanoparticles: multi-wavelength photolumine...
Granadeiro, Carlos M.; Ferreira, Rute A. S.; Soares-Santos, Paula C. R.; Carlos, Luís D.; Trindade, Tito; Nogueira, Helena I. S.Photoluminescent lanthanopolyoxotungstate core/shell nanoparticles are prepared by the encapsulation of lanthanide-containing polyoxometalates (POMs) with amorphous silica shells. The preparation of morphological well-defined core/shell nanoparticles is achieved by the hydrolysis of tetraethoxysilane in the presence of POMs using a reverse microemulsion method. The POMs used are decatungstolanthanoates of [Ln(W...
Nanoencapsulation of luminescent 3-hydroxypicolinate lanthanide complexes
Iwu, Kingsley O.; Soares-Santos, Paula C. R.; Nogueira, Helena I. S.; Carlos, Luis D.; Trindade, TitoWe have synthesized luminescent nanoparticles comprising a core of lanthanide complexes and shells of amorphous silica using reverse micelles as nanoreactors. 3-Hydroxypicolinate complexes of Eu(III), Tb(III), and the corresponding heteronuclear complexes have been investigated as the photoactive cores. The size of the silica particles is within the nanometer scale, which, together with the ability for surface ...
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