Spectroscopy studies of NiFe2O4 nanosized powders obtained using coconut water

Paiva, J. A. C. De; Graça, M.P.F.; Monteiro, J.; Macêdo, M.A.; Valente, M.A.

doi:10.1016/j.jallcom.2009.06.052

Cited by 54 publications

(27 citation statements)

References 37 publications

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“…4) [19,20]. The strong band at 703 cm -1 is a common feature of the Raman spectra of the inverse spinel [20,21]. For the CP compounds, the band, observed at 1080 cm -1 , is attributed, in agreement with our XRD analysis, to the carbonate species.…”

Section: Structural Properties Characterization Of Cp and Ht Catalystssupporting

confidence: 88%

Structural, Textural and Acid–Base Properties of Nano-Sized NiFe2O4 Spinel Catalysts

Benrabaa¹,

Boukhlouf²,

Barama³

et al. 2011

Catal Lett

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Section: Structural Properties Characterization Of Cp and Ht Catalystssupporting

confidence: 88%

Structural, Textural and Acid–Base Properties of Nano-Sized NiFe2O4 Spinel Catalysts

Benrabaa¹,

Boukhlouf²,

Barama³

et al. 2011

Catal Lett

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“…A high-quality NiFe 2 O 4 nanosized powder was prepared by a new route using a natural proteic solution of coconut water and metal ions [95]. The interest in using coconut water was that it naturally contains a large protein chain which can easily bind to metal ions.…”

Section: Contribution To the Nanoworldmentioning

confidence: 99%

Coconut water uses, composition and properties: a review

Prades¹,

Dornier²,

Diop³

et al. 2012

Fruits

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-The product. Coconut water (Cocos nucifera L.) is an ancient tropical beverage whose popularity on the international market has been continuously increasing in recent years. Uses. Besides its various traditional uses, this refreshing liquid extracted from the coconut fruit has recently been described as a "sport beverage" and has drawn the attention of manufacturers as a natural functional drink. Composition. Coconut water has a low matter content (2% to 5% wet basis), mainly comprising sugars and minerals. Quality criteria, such as the water per nut ratio, Total Soluble Solids (TSS), total sugar per nut, and [reducing sugars / total sugars] ratio, are good indicators for estimating the suitability of coconut cultivars for the production of coconut water. Regarding these criteria, dwarf varieties are the most suitable cultivars to obtain a tasty product. Properties. The quality of coconut water can not only be attributed to sugars and minerals because it also has a typical flavour and some original properties. Although many authors have cited medicinal uses or growth-promoting activities, only a few publications have clearly identified the components responsible for these properties. Discussion. Results of former and recent investigations are discussed. Finally, suggestions are made for further research to increase our knowledge of this original tropical juice. Résumé -Le produit. L'eau de coco (Cocos nucifera L.) est un ancien breuvage dont la popularité est grandissante sur le marché international des boissons. Usages. Au-delà de ses usages traditionnels, ce liquide rafraîchissant extrait de la noix a été décrit comme une « boisson de réhydratation pour sportif ». Des industriels ont ainsi mis en exergue ses propriétés fonctionnelles naturelles. Composition. L'eau de coco a une faible teneur en matière sèche (2 % à 5 % en base humide), constituée de sucres et minéraux. Des critères comme le poids de l'eau par noix, les solides solubles totaux, la quantité de sucres totaux par noix, le rapport [sucres réducteurs / sucres totaux] sont de bons indicateurs pour sélectionner les cultivars adaptés à la production d'eau de coco. Au regard de ces critères, les variétés naines sont souvent les mieux adaptées à la production de cette boisson. Propriétés. La qualité de l'eau de coco est aussi liée à une flaveur typique et recherchée ainsi qu'à certaines propriétés spéci-fiques. Bien que plusieurs auteurs aient attribué à l'eau de coco des propriétés médicinales et aient prouvé son effet positif sur la croissance des cellules, peu de publications identifient clairement les molécules responsables de ces actions. Discussion. Pour la première fois, les recherches sur l'eau de coco, des plus anciennes au plus récentes, sont synthétisées et conduisent à proposer des pistes pour améliorer notre connaissance de ce jus de fruit tropical atypique.

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“…Also, the present Raman spectra were measured only in 1000 cm -1 -100 cm -1 , which focuses on the parent modes of NFO compound alone. Without the characteristic peak at 1,370 and 1,580 cm -1 , identifying c-Fe 2 O 3 is difficult in the measured region, and also overlapping of second-order overtone of A 1g and T 2g makes identifying c-Fe 2 O 3 difficult [28,29]. The ellipse outline shown in Fig.…”

Section: Raman Spectra Analysismentioning

confidence: 96%

“…From spectra is attributed to an increase in crystallite size, which depends on the increase in annealing temperature, due to the growth of crystallite size [26]. Analysis of Raman spectra of the solid samples provides the optical modes of the parent compound, and they also provide information on the parasitic phase formed along with the parent compound [26,28,29]. However, the secondary phases of c-Fe 2 O 3 and Fe 3 O 4 are quite difficult to identify both in Raman and in XRD analysis.…”

Section: Raman Spectra Analysismentioning

confidence: 99%

A phenomenal behaviour of nanocrystalline NiFe2O4: influence of secondary and parasitic phases on structure and magnetic property

2015

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In this paper, we report the influence of secondary and parasitic magnetic phases on NiFe 2 O 4 (NFO) nanoparticles synthesised during citrate gel method. Annealing at 773 K showed the presence of secondary and parasitic phases, whereas annealing at 1,073 K for 3 h showed the quenching of the secondary and parasitic phases. X-ray diffraction (XRD) analysis confirmed the nickel ferrite phase, with a trace amount of a-Fe 2 O 3 peak found and other phases being not traceable. The observed a-Fe 2 O 3 peak vanished at 1,073 K annealing, and a single phase of nickel ferrite was formed. The surface morphology of the samples was studied by SEM, which showed the fine grains of nickel ferrite. Raman spectra of the annealed samples were measured and analysed in the range of 1,000-100 cm -1 . Further analysis of isothermal M-H curve, zero-field-cooled and field-cooled (ZFC-FC) measurement and thermo-magnetisation M (T) measurements were performed with the aid of vibrating sample magnetometer on the prepared samples. The measured ZFC-FC curve showed an existence of spin-glass behaviour due to the parasitic phase for 773 K annealed sample, which is quite difficult to be identified using XRD and Raman spectra. Further, we also observed the room temperature coercivity H c = 430 Oe from the M-H curve for the sample annealed at 773 K. Remarkably, both low-temperature and high-temperature M-T curve measurements showed the influence of secondary and parasitic phases for 773 and 1,073K annealed samples.

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Spectroscopy studies of NiFe2O4 nanosized powders obtained using coconut water

Cited by 54 publications

References 37 publications

Structural, Textural and Acid–Base Properties of Nano-Sized NiFe2O4 Spinel Catalysts

Structural, Textural and Acid–Base Properties of Nano-Sized NiFe2O4 Spinel Catalysts

Coconut water uses, composition and properties: a review

A phenomenal behaviour of nanocrystalline NiFe2O4: influence of secondary and parasitic phases on structure and magnetic property

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