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Electrospun nanosized cellulose fibers using ionic liquids at room temperature
Freire, Mara G.; Teles, Ana Rita R.; Ferreira, Rute A. S.; Carlos, Luís D.; Lopes-da-Silva, José A.; Coutinho, João A. P.Aiming at replacing the noxious solvents commonly employed, ionic-liquid-based solvents have been recently explored as novel non-volatile and non-flammable media for the electrospinning of polymers. In this work, nanosized and biodegradable cellulose fibers were obtained by electrospinning at room temperature using a pure ionic liquid or a binary mixture of two selected ionic liquids. The electrospinning of 8 w...
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...
Functional nanostructured chitosan–siloxane hybrids
Silva, S. S.; Ferreira, Rute A. S.; Fu, Lianshe; Carlos, L. D.; Mano, J. F.; Reis, R. L.; Rocha, JoãoNew organic–inorganic hybrids were prepared by a sol–gel method from the biopolymer chitosan and a silane coupling agent, 3-isocyanatopropyltriethoxysilane (ICPTES), in which covalent bridges, essentially composed of urea, bond the chitosan to the poly(siloxane) network. The structural characterization of the advanced chitosan–siloxane hybrids was performed by Fourier transform infrared spectroscopy, X-ray diff...
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