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Ana Cristina Figueiredo de Melo Costa
Researcher at Federal University of Campina Grande
Publications - 109
Citations - 546
Ana Cristina Figueiredo de Melo Costa is an academic researcher from Federal University of Campina Grande. The author has contributed to research in topics: Catalysis & Ferrite (magnet). The author has an hindex of 10, co-authored 99 publications receiving 397 citations.
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Journal ArticleDOI
Catalytic performance of NiFe2O4 and Ni0.3Zn0.7Fe2O4 magnetic nanoparticles during biodiesel production
António Benjamim Mapossa,António Benjamim Mapossa,Joelda Dantas,Manoel Ribeiro da Silva,Ruth Herta Goldsmith Aliaga Kiminami,Ana Cristina Figueiredo de Melo Costa,Michael O. Daramola +6 more
TL;DR: In this paper, the catalytic performance of nanoferrites NiFe2O4 and Ni0.3Zn0.7Fe 2O4 is reported and the presence of a single-phase spinel structure in the synthesized nanoparticles is confirmed by the XRD results.
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Effect of the surface treatment on the structural, morphological, magnetic and biological properties of MFe2O4 iron spinels (M = Cu, Ni, Co, Mn and Fe)
Elvia Leal,Joelda Dantas,P.T.A. Santos,Sheyla Maria de Castro Máximo Bicalho,Ruth Herta Goldsmith Aliaga Kiminami,Manoel Ribeiro da Silva,Ana Cristina Figueiredo de Melo Costa +6 more
TL;DR: In this paper, the authors proposed to obtain iron spinels MFe2O4, and their hybrids MFe 2O4@SiO2 and their corresponding spinels, MFe3O4 and MFe4/SiO 2/chitosan from the surface modification with 3-aminopropyl trimethoxysilane agent and functionalization with chitosans, and then evaluate them as to their structure, morphology, magnetism and cytotoxicity.
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Synthesis of TiO2 by the pechini method and photocatalytic degradation of methyl red
Pollyana Caetano Ribeiro,Ana Cristina Figueiredo de Melo Costa,Ruth Herta Goldschmidt Aliaga Kiminami,José Marcos Sasaki,Hélio de Lucena Lira +4 more
TL;DR: In this paper, the photocatalytic degradation of methyl red dye in aqueous solution was evaluated using X-ray diffraction, phase quantification by Rietveld structure refinement, and textural analysis by nitrogen adsorption.
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Use of Ni-Zn ferrites doped with Cu as catalyst in the transesterification of soybean oil to methyl esters
Joelda Dantas,Jakeline Raiane D. Santos,Rodrigo Bruno L. Cunha,Ruth Herta Goldsmith Aliaga Kiminami,Ana Cristina Figueiredo de Melo Costa +4 more
TL;DR: In this paper, the performance of Ni0.5Zn0.4 ferrite doped with 0.1 and 0.4 mol of Cu was evaluated for the transesterification of soybean oil to biodiesel, using methanol.
Journal ArticleDOI
Sintering of Ni-Zn ferrite nanopowders by the constant heating rate (CHR) method
Ana Cristina Figueiredo de Melo Costa,Edener Tortella,Elias Fagury Neto,Márcio Raymundo Morelli,Ruth Herta Goldschmidt Aliaga Kiminami +4 more
TL;DR: In this paper, a nonisothermal sintering method using a constant heating rate (CHR) was studied using Ni-Zn ferrite powders, with average particle size varying from 18 nm to 29 nm, were uniaxially pressed and sintered in an horizontal dilatometer.