Search Results - "SA FERREIRA, R. A"

Interconvertable Modular Framework and Layered Lanthanide(III)-Etidronic Acid Coordination Polymers by Shi, F. N, Cunha-Silva, L, Mafra, L, Trindade, T, Carlos, L. D, Almeida Paz, F. A, Rocha, J

“…Isostructural modular microporous Na2[Y(hedp)(H2O)0.67] and Na4[Ln2(hedp)2(H2O)2]·nH2O (Ln = La, Ce, Nd, Eu, Gd, Tb, Er) framework-type, and layered…”
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Optical material composed of a di-urethanesil host hybrid and a europium complex by Fernandes, M., Gonçalves, M.C., de Zea Bermudez, V., Sá Ferreira, R.A., Carlos, L.D., Charas, A., Morgado, J.

“…Preliminary results regarding the structure, thermal behaviour and photoluminescence features of a hybrid compound composed of a di-urethane cross-linked…”
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Highly Photostable Luminescent Poly(ε-caprolactone)siloxane Biohybrids Doped with Europium Complexes by Fernandes, M, de Zea Bermudez, V, Sá Ferreira, R. A, Carlos, L. D, Charas, A, Morgado, J, Silva, M. M, Smith, M. J

“…In this paper, we propose for the first time that the combination of a sol−gel derived diurethane cross-linked siloxane-based biohybrid host including short…”
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Incorporation of mixed valence vanadium in the microporous titanosilicate AM-2 by Ferdov, S., Lin, Z., Sá Ferreira, R.A.

“…Titanium and silicon have been partly substituted by vanadium in the microporous titanosilicate AM-2 to produce V-AM-2 via direct hydrothermal method. The…”
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Optically functional nanocomposites with poly(oxyethylene)-based di-ureasils and mesoporous MCM-41 by Fu, Lianshe, Sá Ferreira, R.A., Valente, A., Rocha, J., Carlos, L.D.

“…Di-urea cross-linked poly(oxyethylene) (POE)/siloxane hybrid structure (di-ureasil) was incorporated into the hexagonal array of one-dimensional channels of…”
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White-Light Emission of Amine-Functionalized Organic/Inorganic Hybrids:  Emitting Centers and Recombination Mechanisms by Carlos, L. D, Sá Ferreira, R. A, Pereira, R. N, Assunção, M, de Zea Bermudez, V

“…This work discusses the recombination mechanisms and the chemical nature of the emitting centers subjacent to the white-light emission of sol−gel derived…”
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Structure and photoluminescence of di-amidosil nanohybrids incorporating europium triflate by Nunes, S.C., de Zea Bermudez, V., Cybinska, J., Sá Ferreira, R.A., Carlos, L.D., Legendziewicz, J., Silva, M.M., Smith, M.J., Ostrovskii, D.

“…The sol–gel process was used to prepare amorphous di-amide cross-linked alkyl/siloxane hybrid materials (di-amidosils) incorporating europium triflate (Eu(CF…”
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Study of sol–gel derived di-ureasils doped with zinc triflate by Nunes, S.C., de Zea Bermudez, V., Silva, M.M., Smith, M.J., Morales, E., Sá Ferreira, R.A., Carlos, L.D., Rocha, J.

“…Zinc triflate (Zn(CF 3SO 3) 2)-doped sol–gel derived di-urea cross-linked POE/siloxane ormolytes (designated as di-ureasils) with ∞ > n ⩾ 1 (where the salt…”
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Optically Functional Di-Urethanesil Nanohybrids Containing Eu3+ Ions by Gonçalves, M. C, de Zea Bermudez, V, Sá Ferreira, R. A, Carlos, L. D, Ostrovskii, D, Rocha, J

“…Sol−gel derived poly(oxyethylene)/siloxane hybrids (di-urethanesils) doped with europium triflate, Eu(CF3SO3)3, were examined by XRD, 13C and 29Si MAS NMR and…”
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Energy-Transfer Mechanisms and Emission Quantum Yields In Eu3+-Based Siloxane-Poly(oxyethylene) Nanohybrids by Sá Ferreira, R. A, Carlos, L. D, Gonçalves, R. R, Ribeiro, S. J. L, de Zea Bermudez, V

“…We report the energy-transfer mechanisms and emission quantum yield measurements of sol−gel-derived Eu3+-based nanohybrids. The matrix of these materials,…”
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Synthesis, Characterisation and Luminescent Properties of Lanthanide-Organic Polymers with Picolinic and Glutaric Acids by Girginova, Penka I., Almeida Paz, Filipe A., Soares-Santos, Paula C. R., Sá Ferreira, R. A., Carlos, Luís D., Amaral, Vítor S., Klinowski, Jacek, Nogueira, Helena I. S., Trindade, Tito

“…Three new lanthanide(III) complexes (Ln = Sm, Tb and Eu) of picolinic and glutaric acid were prepared and characterised. The crystal structure of the complex…”
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Local Structure and Near-Infrared Emission Features of Neodymium-Based Amine Functionalized Organic/Inorganic Hybrids by Gonçalves, M. C, Silva, N. J. O, de Zea Bermudez, V, Sá Ferreira, R. A, Carlos, L. D, Dahmouche, K, Santilli, C. V, Ostrovskii, D, Correia Vilela, I. C, Craievich, A. F

“…Nd3+-based organic/inorganic hybrids have potential application in the field of integrated optics. Attractive sol−gel derived di-urea and di-urethane…”
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Nanostructure and luminescent properties of sol-gel derived europium-doped amine functionalised hybrids by DAHMOUCHE, K, SANTILLI, C. V, PULCINELLI, S. H, SA FERREIRA, R. A, CARLOS, L. D, DE ZEA BERMUDEZ, V, CRAIEVICH, A. F

“…The effect of doping by europium triflate on the nanoscopic structure of organic-inorganic hybrid formed by a siliceous network containing pendant…”
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Coordination of Eu3+ Ions in Siliceous Nanohybrids Containing Short Polyether Chains and Bridging Urea Cross-links by de Zea Bermudez, V, Sá Ferreira, R. A, Carlos, L. D, Molina, C, Dahmouche, K, Ribeiro, S. J. L

“…Infrared and photoluminescence spectroscopies have been used to investigate the local environment of the Eu3+ ions in luminescent sol−gel derived…”
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Photoluminescence of bulks and thin films of Eu3+-doped organic/inorganic hybrids by PECORARO, E, SA FERREIRA, R. A, MOLINA, C, RIBEIRO, S. J. L, MESSSADDEQ, Y, CARLOS, L. D

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Short chain U(600) di-urea cross-linked poly(oxyethylene)/siloxane ormolytes doped with lanthanum triflate salt by Gomes Correia, S.M., de Zea Bermudez, V., Silva, M.M., Barros, S., Sá Ferreira, R.A., Carlos, L.D., Smith, M.J.

“…Promising La 3+-doped electrolytes based on a hybrid poly(oxyethylene)/siliceous host matrix, U(600), have been produced. The organic and inorganic components…”
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Short-chain di-ureasil ormolytes doped with potassium triflate: Phase diagram and conductivity behavior by DE ZEA BERMUDEZ, V, GOMES CORREIA, S. M, SILVA, M. M, BARROS, S, SMITH, M. J, SA FERREIRA, R. A, CARLOS, L. D, MOLINA, C, RIBEIRO, S. J. L

“…Di-urea cross-linked poly(oxyethylene)/siloxane hybrids, synthesized by the sol-gel process and containing a wide concentration range of potassium triflate,…”
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Modeling of the emission red-shift in organic–inorganic di-ureasil hybrids by Ferreira, R.A. Sá, Ferreira, A.L., Carlos, L.D.

“…The red-shift of the emission maximum intensity as the excitation energy decreases is modeled for organic/inorganic hybrids formed by a siliceous skeleton…”
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Eu3+ Coordination in an Organic/Inorganic Hybrid Matrix with Methyl End-Capped Short Polyether Chains by de Zea Bermudez, V, Ostrovskii, D, Gonçalves, M. C, Lavoryk, S, Carlos, L. D, Sá Ferreira, R. A

“…Fourier Transform mid-infrared (FT-IR), Fourier Transform Raman (FT-Raman) and photoluminescence spectroscopies and Two-Dimensional (2D) Correlation…”
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Sol−Gel Derived Urea Cross-Linked Organically Modified Silicates. 2. Blue-Light Emission by Carlos, L. D, de Zea Bermudez, V, Sá Ferreira, R. A, Marques, L, Assunção, M

“…The photoluminescence and the local structure of sol−gel derived organic−inorganic hybrids, so-called ureasils, are discussed. Their host matrix is a…”
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