Magnetite Nucleation and Growth

Reichel, Victoria; Faivre, Damien

doi:10.1007/978-3-319-45669-0_14

Cited by 9 publications

(5 citation statements)

References 51 publications

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“…En la estructura, los Fe 3+ se comportan como ácidos de Lewis, mientras que los O 2-, como bases de Brönsted; ambos accesibles en la superficie, lo que les confiere características de adsorción potencial. La atracción de las NPM del medio contaminante por medios magnéticos facilita su recuperación; no obstante, debido a su tamaño, sufren de una tasa de lixiviación de hierro alta, forman agregados que generan lodo no deseado, debido a sus energías superficiales altas e interacciones magnéticas fuertes entre sí, lo que limita su reutilización (Liosis, et al, 2021;Liu, et al, 2014;Reichel y Faivre, 2017).…”

Section: Fases Magnéticas De Hierro Magnetita Y Maghemitaunclassified

Propuesta experimental docente para la síntesis de nanomateriales magnéticos. Nanopartículas magnéticas en montmorillonita

Chávez García,

Rodríguez González,

Ramos Mejía

et al. 2024

Educación Química

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En este trabajo se desarrolló una propuesta experimental para estudiantes universitarios por medio del Aprendizaje con Base en Problemas. A quienes se les proporcionó el reto de preparar un nanomaterial cerámico para la descontaminación de suelos; actividades enmarcadas en las áreas de la química de sólidos y de materiales cerámicos. Los estudiantes mostraron su capacidad al proponer el diseño de nanopartículas magnéticas de hierro insertadas en una arcilla montmorillonítica para la resolución del problema; a través de sus habilidades de investigación en literatura confiable, plantearon sus objetivos, hipótesis y metodología para la síntesis in situ de las nanopartículas magnéticas, en una montmorillonita acondicionada; desarrollaron e interpretaron los experimentos; realizaron la caracterizaron estructural de sus nanomateriales por las técnicas de difracción de rayos X de polvos y espectroscopía de absorción infrarroja; finalmente, concluyeron sus resultados. De forma paralela, desarrollaron sus habilidades de reflexión, toma de decisiones, de intercambio y comunicación de opiniones e información, argumentaron, memorizaron y formularon sus ideas. Los estudiantes expusieron sus avances en los seminarios semanales; redactaron el informe final en forma de artículo de investigación y realizaron una muestra experimental en la Feria de Química de la Facultad de Química, UNAM.

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Section: Fases Magnéticas De Hierro Magnetita Y Maghemitaunclassified

Propuesta experimental docente para la síntesis de nanomateriales magnéticos. Nanopartículas magnéticas en montmorillonita

Chávez García,

Rodríguez González,

Ramos Mejía

et al. 2024

Educación Química

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“…Otherwise, the coexistence of oxo and hydroxo bridges will lead to oxyhydroxides (bulk intermediates). 68 The formation of amorphous or poorly crystalline intermediates is a common pathway for crystalliza-tion, 61,130−134 especially in biological or biomimetic processes. These intermediates have fewer structural discrepancies with the reactants, resulting in a lower formation energy barrier and lower surface energy compared to the final well-crystallized phase.…”

Section: Crystallization Pathway Of Magnetitementioning

confidence: 99%

“…If the olation process is slower than the oxolation process, then the product will be an oxide (magnetite). Otherwise, the coexistence of oxo and hydroxo bridges will lead to oxyhydroxides (bulk intermediates) …”

Section: Crystallization Pathway Of Magnetitementioning

confidence: 99%

“…Recent development of advanced characterization techniques with high temporal and spatial resolution, including in situ electron microscopy and spectroscopy, have enabled a more in-depth understanding of the crystallization process of magnetite. − These techniques have captured the presence of various nanosized (below 5 nm), short-lived or unstable intermediates and provided more information about their properties. These emerging discoveries reveal that magnetite follows an alternative theoretic model, nonclassical crystallization theory, ,− which incorporates the role of intermediates such as prenucleation clusters (PNCs), − amorphous intermediates, ,− and nanocrystals ,− in the crystallization process. − These intermediates are commonly observed in biominerals, such as carbonates, phosphates, and other iron oxides.…”

Section: Introductionmentioning

confidence: 99%

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Recent Advances in Magnetite Crystallization: Pathway, Modulation, and Characterization

Shi

Feng

et al. 2023

Crystal Growth & Design

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Magnetite has wide applications in the fields of environment, biomedicine, and energy storage. Understanding the crystallization process of magnetite will improve the design and control of its properties. However, the challenge lies in determining the crystallization pathway of magnetite due to its nanosized and unstable intermediates. Recent developments in the in situ characterization techniques have shed light on this process, which has rarely been elucidated systematically. This review builds the correlation between the typical synthesis methods and the corresponding properties of magnetite. It also outlines a general multistage crystallization pathway involving a series of intermediates and explains how various strategies (e.g., pH and additives) modulate magnetite properties by influencing its intermediates during crystallization. To better illustrate published observations and reconcile conflicting perspectives, classical and state-of-the-art crystallization theories will be incorporated into each aspect. Moreover, this review highlights the importance of in situ characterization techniques, which enables the precise observation of crystallization processes. The goal of this review is to provide a fundamental understanding of magnetite crystallization and to guide the bottom-up design of magnetic materials for diverse applications.

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“…They are employed for a variety of in vitro and in vivo applications, including drug delivery, gene delivery, hyperthermia and can be used in magnetic resonance imaging (MRI) as contrast agents. In recent years, various different systems based on magnetic iron oxide nanoparticles and their coatings have been introduced for potential usage in diagnostics and therapeutics [ 2 , 3 , 4 , 5 , 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Magnetite-Arginine Nanoparticles as a Multifunctional Biomedical Tool

et al. 2020

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Iron oxide nanoparticles are a promising platform for biomedical applications, both in terms of diagnostics and therapeutics. In addition, arginine-rich polypeptides are known to penetrate across cell membranes. Here, we thus introduce a system based on magnetite nanoparticles and the polypeptide poly-l-arginine (polyR-Fe3O4). We show that the hybrid nanoparticles exhibit a low cytotoxicity that is comparable to Resovist®, a commercially available drug. PolyR-Fe3O4 particles perform very well in diagnostic applications, such as magnetic particle imaging (1.7 and 1.35 higher signal respectively for the 3rd and 11th harmonic when compared to Resovist®), or as contrast agents for magnetic resonance imaging (R2/R1 ratio of 17 as compared to 11 at 0.94 T for Resovist®). Moreover, these novel particles can also be used for therapeutic purposes such as hyperthermia, achieving a specific heating power ratio of 208 W/g as compared to 83 W/g for Feridex®, another commercially available product. Therefore, we envision such materials to play a role in the future theranostic applications, where the arginine ability to deliver cargo into the cell can be coupled to the magnetite imaging properties and cancer fighting activity.

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Magnetite Nucleation and Growth

Cited by 9 publications

References 51 publications

Propuesta experimental docente para la síntesis de nanomateriales magnéticos. Nanopartículas magnéticas en montmorillonita

Propuesta experimental docente para la síntesis de nanomateriales magnéticos. Nanopartículas magnéticas en montmorillonita

Recent Advances in Magnetite Crystallization: Pathway, Modulation, and Characterization

Magnetite-Arginine Nanoparticles as a Multifunctional Biomedical Tool

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