Influence of aging time of oleate precursor on the magnetic relaxation of cobalt ferrite nanoparticles synthesized by the thermal decomposition method

Herrera, Adriana; Polo-Corrales, Liliana; Chavez, Ermides; Cabarcas-Bolivar, Jari; Uwakweh, O. N. C.; Rinaldi, Carlos

doi:10.1016/j.jmmm.2012.09.069

Cited by 72 publications

(37 citation statements)

References 44 publications

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“…Decomposition of precursors with cationic metal centers leads directly to metal oxide NPs, while organometallic precursors in which metal has zero valence in their composition initially lead to the formation of metal NPs, but when followed by oxidation they can lead to high‐quality monodispersed metal oxides . Three main factors control the size and shape of the obtained MNPs, which include the decomposition temperature, the precursor/capping agent ratio, and the duration of the reaction after reaching the boiling point . Despite the referred advantages, thermal decomposition usually leads to complicated processes at relatively high temperatures and to the production of organic‐soluble MNPs that may limit their applicability in the biomedical field.…”

Section: Magnetic Npsmentioning

confidence: 99%

Advances in Magnetic Nanoparticles for Biomedical Applications

Cardoso

Francesko

Ribeiro

et al. 2017

Adv Healthcare Materials

550

330

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Magnetic nanoparticles (NPs) are emerging as an important class of biomedical functional nanomaterials in areas such as hyperthermia, drug release, tissue engineering, theranostic, and lab-on-a-chip, due to their exclusive chemical and physical properties. Although some works can be found reviewing the main application of magnetic NPs in the area of biomedical engineering, recent and intense progress on magnetic nanoparticle research, from synthesis to surface functionalization strategies, demands for a work that includes, summarizes, and debates current directions and ongoing advancements in this research field. Thus, the present work addresses the structure, synthesis, properties, and the incorporation of magnetic NPs in nanocomposites, highlighting the most relevant effects of the synthesis on the magnetic and structural properties of the magnetic NPs and how these effects limit their utilization in the biomedical area. Furthermore, this review next focuses on the application of magnetic NPs on the biomedical field. Finally, a discussion of the main challenges and an outlook of the future developments in the use of magnetic NPs for advanced biomedical applications are critically provided.

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Section: Magnetic Npsmentioning

confidence: 99%

Advances in Magnetic Nanoparticles for Biomedical Applications

Cardoso

Francesko

Ribeiro

et al. 2017

Adv Healthcare Materials

550

330

View full text Add to dashboard Cite

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“…A metal-oleate precursor (Co þ 2 Fe þ 3 ) was synthesized by dissolving stoichiometric amounts of FeCl 3 Á 6H 2 O, CoCl 2 Á 6H 2 O, and sodium oleate in a mixture of ethanol, distilled water, and hexane under reflux at 70°C during 4 h. The resulting two-phase mixture, an organic phase containing the metal-oleate and an aqueous phase containing the salts, was washed three times with distilled water and the aqueous phase was discarded. The metal-oleate obtained was aged in a vacuum oven at 80°C for 30 days to allow evaporation of the ethanol and hexane and enhance Brownian behavior of the MNPs [64].…”

Section: Synthesis Of Oleic Acid Coated Cofe 2 O 4 Magnetic Npsmentioning

confidence: 99%

Assessing magnetic nanoparticle aggregation in polymer melts by dynamic magnetic susceptibility measurements

Sierra-Bermúdez

Maldonado-Camargo

Orange

et al. 2015

Journal of Magnetism and Magnetic Materials

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“…En estos experimentos, se observó que el AOS resultó ser más efectivo que el AOC, obteniéndose un incremento en el flux de agua, de aproximadamente 30%, que se puede atribuir a que el AOS se preparó fresco en el laboratorio, usando como electrolitos, una relación de azúcar y glucosa anhídrica, en 50/50 %p/p, mientras que al AOC, compuesto principalmente por dextrosa/fructosa, se le observó un contenido de humedad al momento de retirarlo del empaque e implementarlo en el sistema, lo que pudo resultar en un menor aporte de presión osmótica a la solución y, por ende, menor arrastre de agua, a través de la membrana. nopartículas magnéticas por el método de descomposición termal, que permite tener nanopartículas monodispersas y con buen control de tamaño, pero con elevados costos de reactivos y materiales (Herrera et al 2013). A pesar que en el presente estudio se obtuvieron valores más bajos de flux de agua, son relevantes, toda vez que las nanopartículas fueron obtenidas por un método sencillo y económico, como la co-precipitación y fueron implementadas como nanoaditivos, con concentraciones máximas de 112,5mg/L, lo que puede sugerir que un aumento en la concentración de estos nanomateriales puede incrementar el flux de agua, en el proceso de ósmosis directa.…”

Section: Resultados Y Discusiónunclassified

Implementación de ósmosis directa y nanoaditivos magnéticos para desalinización de agua

Herrera

Vela

Morales

et al. 2016

Rev. U.D.C.A Act. & Div. Cient.

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RESUMENSe evaluó, a escala laboratorio, la desalinización por ósmosis directa de agua de mar sintética. Este sistema utilizó un agente osmótico comercial y un agente osmótico preparado, a partir de azúcar/glucosa anhídrida 50/50%p/p y nanopartículas magnéticas, modificadas con carboximetil celulosa (MNp-CMC). De acuerdo a mediciones de dispersión de luz dinámica, las nanopartículas exhibieron un tamaño hidrodinámico de 173±53nm. Un valor de flux de agua desalinizada de 1,3LMH fue determinado al adicionar 112,5mg/ mL de MNp-CMC al agente osmótico sintético, produciéndose un aumento del 9,2%, comparado al flux obtenido sin el uso del nanoaditivo. En adición, se evaluó la remoción de las nanopartículas magnéticas, aplicando un campo electromagnético externo. A pesar que se observó una disminución en la concentración de nanopartículas presentes en el efluente, luego de ocho ciclos de separación magnética, se detectó, por espectrofotometría de absorción atómica, una concentración de 227mg Fe/L en el agua desalinizada, lo cual, supera el valor máximo aceptable de hierro en aguas potables (0,3mg Fe/L), reflejando así la necesidad de mejorar el proceso de separación magnética, para el empleo de nanoaditivos magnéticos, en procesos de desalinización de agua, por osmosis directa. SUMMARYAt a laboratory scale by means of a direct osmosis process the desalination of a synthetic seawater was evaluated. This system employed a commercial osmotic and a synthetic osmotic agent prepared from sugar/anhydrous glucose 50/50%w/w and magnetic nanoparticles modified with carboxymethyl cellulose (MNp-CMC). According to measurements from dynamic light scattering, nanoparticles exhibited a hydrodynamic size of 173±53nm. A desalinated water flux of 1,3LMH was determined by the addition of 112,5mg/mL of MNp-CMC to the synthetic osmotic agent, showing an increase of 9.2% as compared to the one obtained without the use of the nanoadditives. Additionally, the magnetic decantation of the nanoparticles by applying an external electromagnetic field was evaluated. Although a concentration decrease of nanoparticles in the water effluent after eight cycles of magnetic separation was detected; by atomic absorption spectroscopy a concentration of 227mg Fe/L in the desalinized water was identified, which is higher than the maximum iron content allowed in drinking water (0.3mg Fe/L), showing that more work is required in order to improve the process of magnetic separation for the application of magnetic nanoadditives in the desalinization of water by direct osmosis systems.

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Influence of aging time of oleate precursor on the magnetic relaxation of cobalt ferrite nanoparticles synthesized by the thermal decomposition method

Cited by 72 publications

References 44 publications

Advances in Magnetic Nanoparticles for Biomedical Applications

Advances in Magnetic Nanoparticles for Biomedical Applications

Assessing magnetic nanoparticle aggregation in polymer melts by dynamic magnetic susceptibility measurements

Implementación de ósmosis directa y nanoaditivos magnéticos para desalinización de agua

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