P
Paulo S. Calefi
Researcher at São Paulo Federal Institute of Education, Science and Technology
Publications - 85
Citations - 1555
Paulo S. Calefi is an academic researcher from São Paulo Federal Institute of Education, Science and Technology. The author has contributed to research in topics: Sol-gel & Infrared spectroscopy. The author has an hindex of 23, co-authored 85 publications receiving 1452 citations. Previous affiliations of Paulo S. Calefi include Federal University of Paraná & UNIFRAN - University of Franca (UNIFRAN - Universidade de Franca).
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Journal ArticleDOI
New synthesis strategies for effective functionalization of kaolinite and saponite with silylating agents.
Lilian R. Avila,Emerson H. de Faria,Katia J. Ciuffi,Eduardo J. Nassar,Paulo S. Calefi,Miguel Vicente,Raquel Trujillano +6 more
TL;DR: Functionalization of Brazilian São Simão kaolinite and Spanish Yunclillos saponite with the alkoxysilanes 3-aminopropyltriethoxysILane and 3-mercaptopropyltrimeth oxysilane is reported, which demonstrated the effectiveness of the interlamellar grafting process.
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Porphyrin-kaolinite as efficient catalyst for oxidation reactions.
Natalia Bizaia,Emerson H. de Faria,Gustavo Pimenta Ricci,Paulo S. Calefi,Eduardo J. Nassar,Kelly Aparecida Dias de Freitas Castro,Shirley Nakagaki,Katia J. Ciuffi,Raquel Trujillano,Miguel Vicente,Antonio Gil,S.A. Korili +11 more
TL;DR: Brazilian Sao Simao kaolinite clay has been functionalized with [meso-tetrakis(pentafluorophenyl)porphinato]iron(III), Fe(TPFPP, and a red shift in the Soret band of the iron porphyrin in the functionalized material is revealed, indicating Fe(III)P --> Fe(II)P reduction.
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The blue phosphor Sr2CeO4 synthesized by Pechini’s method
TL;DR: In this paper, a blue phosphor, Sr 2 CeO 4, was identified by a combinatorial materials synthesis technique and further synthesized using the chemical coprecipitation method and the decomposition of acetates, carbonates and oxalates in a tedious procedure.
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Red, green and blue (RGB) emission doped Y3Al5O12 (YAG) phosphors prepared by non-hydrolytic sol-gel route
Paula F.S. Pereira,Marcela G. Matos,Lilian R. Avila,Evelisy Cristina de Oliveira Nassor,Alexandre Cestari,Katia J. Ciuffi,Paulo S. Calefi,Eduardo J. Nassar +7 more
TL;DR: In this article, an evolutionary optimization process involving combination chemistry was employed in an attempt to develop Y3Al5O12 (YAG), which consisted the doping of the YAG host with appropriate amounts of red (R), green (G), and blue (B) dopants in a single layer, for use in tricolor white light.
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New highly luminescent hybrid materials: terbium pyridine-picolinate covalently grafted on kaolinite.
Emerson H. de Faria,Eduardo J. Nassar,Katia J. Ciuffi,Miguel Vicente,Raquel Trujillano,Vicente Rives,Paulo S. Calefi +6 more
TL;DR: The thermogravimetric curves indicated an enhancement in the thermal stability up to 300 °C for the lanthanide complexes covalently grafted on kaolinite, with respect to the isolated complexes.