Structural and magnetic characterization of co-precipitated Ni Zn1−Fe2O4 ferrite nanoparticles

Srinivas, Ch.; Tirupanyam, B. V.; Meena, Sher Singh; Yusuf, S. M.; Babu, Ch. Seshu; Ramakrishna, K.; Potukuchi, D. M.; Sastry, D.L.

doi:10.1016/j.jmmm.2016.01.060

Cited by 78 publications

(20 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Nano-spinel ferrites have drawn considerable attention of researchers owing to their fascinating and noticeably distinguishing characteristics than their corresponding bulk part. They have a wide range of applications in diverse fields like memory storage devices, high-density magnetic recording discs, ferrofluids, magnetocaloric refrigeration, hyperthermia, drug delivery, and many other biomedical applications [1][2][3][4][5][6]. A cubic spinel ferrite, having a variety of applications like catalysis, humidity sensing, magnetic technology, and biomedicine [7,8].…”

Section: Introduction mentioning

confidence: 99%

Zn2+ substituted superparamagnetic MgFe2O4 spinel-ferrites: Investigations on structural and spin-interactions

2020

View full text Add to dashboard Cite

Nano-magnetic ferrites with composition Mg1−xZnxFe2O4 (x = 0.3, 0.4, 0.5, 0.6, and 0.7) have been prepared by coprecipitation method. X-ray diffraction (XRD) studies showed that the lattice parameter was found to increase from 8.402 to 8.424 Å with Zn2+ ion content from 0.3 to 0.7. Fourier transform infrared (FTIR) spectra revealed two prominent peaks corresponding to tetrahedral and octahedral at around 560 and 430 cm−1 respectively that confirmed the spinel phase of the samples. Transmission electron microscopy (TEM) images showed that the particle size was noted to increase from 18 to 24 nm with an increase in Zn content from x = 0.3 to 0.7. The magnetic properties were studied by vibrating sample magnetometer (VSM) and electron paramagnetic resonance (EPR) which ascertained the superparamagnetic behavior of the samples and contribution of superexchange interactions. The maximum magnetization was found to vary from 23.80 to 32.78 emu/g that increased till x = 0.5 and decreased thereafter. Further, X-ray photoelectron spectroscopy (XPS) was employed to investigate the chemical composition and substantiate their oxidation states.

show abstract

Section: Introduction mentioning

confidence: 99%

Zn2+ substituted superparamagnetic MgFe2O4 spinel-ferrites: Investigations on structural and spin-interactions

2020

View full text Add to dashboard Cite

show abstract

“…The decrease in the intensity of these peaks with increasing calcination temperatures indicates the removal and decomposition of surfactants from calcined powders. It was reported that the bands observed in the range 600–400 cm −1 are related to stretching vibrations of metal–oxygen connection at the tetrahedral and octahedral sites . As can be seen the intensity of these bonds increases with increasing calcination temperature which confirms the formation of oxide ceramic species.…”

Section: Resultsmentioning

confidence: 55%

Microemulsion synthesis, optical and photocatalytic properties of vanadium‐doped nano ZnO

Shahi

Hassanzadeh-Tabrizi

Saffar‐Teluri

2017

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

In the present work, vanadium-doped ZnO nanoparticles with different V concentrations were prepared via microemulsion method and employed as an effective photocatalyst for the degradation of methylene blue. The prepared samples were characterized by different techniques such as thermogravimetric and differential thermal analysis (TG-DTA), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), X-ray diffraction (XRD), scanning electron microscopy (SEM), elemental mapping (MAP), and ultraviolet-visible spectroscopy (Uv-Vis). The XRD patterns of vanadium-doped samples were assigned to wurtzite structure of ZnO and vanadium ions were incorporated into the lattice of zinc oxide. SEM images showed that the synthesized pure zinc oxide has irregular morphology and with adding vanadium dopant, rod and cube-like morphology appeared. The band gap energy of pure ZnO decreased from 3.3 to 3.21 eV on adding 1% vanadium. The results showed that the zinc oxide doped with 1% vanadium exhibited better photocatalytic activity compared to other samples. The possible mechanism for improving of photodegradation efficiency of doped samples was also discussed. K E Y W O R D S microemulsion, nanoparticles, photocatalyst, vanadium, ZnO

show abstract

“…Vários autores relatam sobre as excelentes propriedades intrínsecas e extrínsecas das ferritas, e porque devido a isto são possíveis inúmeras aplicações tecnológicas [12][13][14][15][16] …”

Section: Introductionunclassified

Síntese, caracterização e performance catalítica de nanoferritas mistas submetidas a reação de transesterificação e esterificação via rota metílica e etílica para biodiesel

Dantas¹,

Leal²,

Mapossa³

et al. 2016

Matéria (Rio J.)

View full text Add to dashboard Cite

RESUMOAs nanoferritas mistas de Ni 0,5 Zn 0,5 Fe 2 O 4 e Ni 0,2 Cu 0,3 Zn 0,5 Fe 2 O 4 foram sintetizadas por reação de combustão usando ureia como combustível e um reator cônico como fonte de aquecimento para produção em bateladas de 10 g, e então, testadas como nanocatalisadores heterogêneos nas reações de transesterificação e esterificação metílica e etílica do óleo de soja para produção de biodiesel. Durante as sínteses foram registrados o tempo e a temperatura das reações, bem como observadas a liberação de gases e a cor das chamas emitidas. As amostras foram caracterizadas por DRX, EDX, FTIR, MEV/EDS, BET e cromatografia gasosa. Os testes reacionais foram executados para 10 g do óleo em duração de 1 h, razão molar 1:12 óleo:álcool, 2 % (m/m) de catalisador e conduzidas a 180 ºC. Os difratogramas de DRX e os espectros de FTIR revelaram presença da fase espinélio inverso tipo B(AB) 2 O 4 . A morfologia apresentou a formação de aglomerados de aspecto frágil e elevada área de superfície. As análises cromatográficas produziram excelentes resultados nas reações de esterificação para ambas amostras nas condições testadas, com destaque especial para Ni 0,5 Zn 0,5 Fe 2 O 4 , cujas conversões foram de 91,4 % em ésteres metílicos e de 77,8 % em ésteres etílicos, enquanto que a amostra Ni 0,2 Cu 0,3 Zn 0,5 Fe 2 O 4 apresentou conversões de 75,1 e 65,1 %, respectivamente. As conversões na transesterificação metílica e etílica foram de 14 e 2 % para Ni 0,5 Zn 0,5 Fe 2 O 4 e de 11 e 3 % para Ni 0,2 Cu 0,3 Zn 0,5 Fe 2 O 4 .Palavras-Chave: Ferritas mistas, reação de combustão, nanocatalisadores, transesterificação, esterificação, biodiesel. ABSTRACTThe mixed nanoferrites of Ni 0.5 Zn 0.5 Fe 2 O 4 and Ni 0.2 Cu 0.3 Zn 0.5 Fe 2 O 4 were synthesized by combustion reaction using urea as fuel and a conical reactor as heating source in batches of 10 g, and then tested as heterogeneous nanocatalysts in the transesterification and esterification reaction of soya bean oil using the methyl and ethyl routes to biodiesel production. During the synthesis the time and temperature of the reactions were measured, and the evolved gases and the color of the emitted flames were observed. The samples were characterized by XRD, EDX, FTIR, SEM/EDS, BET and gas chromatography. The reaction tests were carried out with 10 g of oil for 1 h, oil:alcohol molar ratio of 1:12, 2 % (w/w) of catalyst, and conducted at 180 °C. The XRD patterns and the FTIR spectra revealed the presence of the inverse spinel phase type B(AB) 2 O 4 . The morphology showed the formation of agglomerates with fragile morphology and high surface area. The chromatographic analysis produced excellent results in the esterification reactions for both samples in the tested conditions, with special emphasis on Ni 0.5 Zn 0.5 Fe 2 O 4 , whose conversions were of 91.4 % in methyl esters and of 77.8 % in ethyl esters, while the Ni 0.2 Cu 0.3 Zn 0.5 Fe 2 O 4 sample showed conversion of 75.1 and 65.1 %, respectively.

show abstract

Structural and magnetic characterization of co-precipitated Ni Zn1−Fe2O4 ferrite nanoparticles

Cited by 78 publications

References 41 publications

Zn2+ substituted superparamagnetic MgFe2O4 spinel-ferrites: Investigations on structural and spin-interactions

Zn2+ substituted superparamagnetic MgFe2O4 spinel-ferrites: Investigations on structural and spin-interactions

Microemulsion synthesis, optical and photocatalytic properties of vanadium‐doped nano ZnO

Síntese, caracterização e performance catalítica de nanoferritas mistas submetidas a reação de transesterificação e esterificação via rota metílica e etílica para biodiesel

Contact Info

Product

Resources

About