A5075884069- Iron oxide chemistry and applications
- Characterization and Applications of Magnetic Nanoparticles
- Nanoparticle-Based Drug Delivery
- Magnetic Properties and Synthesis of Ferrites
- Magnetic properties of thin films
- Minerals Flotation and Separation Techniques
- Laser-Ablation Synthesis of Nanoparticles
- Nanomaterials for catalytic reactions
- Silicon Nanostructures and Photoluminescence
- Diamond and Carbon-based Materials Research
- Magnetic Properties and Applications
- Iron Metabolism and Disorders
- Ion-surface interactions and analysis
- Gold and Silver Nanoparticles Synthesis and Applications
- Metal and Thin Film Mechanics
- Microfluidic and Bio-sensing Technologies
- Nanoparticles: synthesis and applications
- Geomagnetism and Paleomagnetism Studies
- Enzyme-mediated dye degradation
- Lanthanide and Transition Metal Complexes
- Magnetic Properties of Alloys
- Pneumonia and Respiratory Infections
- Clay minerals and soil interactions
- Multiferroics and related materials
- Supercapacitor Materials and Fabrication
Consejo Superior de Investigaciones Científicas
2012-2024
Instituto de Ciencia de Materiales de Madrid
2015-2024
Georgia Institute of Technology
2024
Universitat Politècnica de Catalunya
2023-2024
Barcelona Supercomputing Center
2023-2024
Instituto de Ciencia de Materiales de Sevilla
2002-2023
University of Michigan
2023
Universidad Libre de Colombia
2021
Fundación Pro Salud y Medio Ambiente
2021
International Council on Mining and Metals
1999-2020
This review is focused on describing state-of-the-art synthetic routes for the preparation of magnetic nanoparticles useful biomedical applications. In addition to this topic, we have also described in some detail possible applications field biomedicine with special emphasis showing benefits using nanoparticles. Finally, addressed relevant findings importance having well-defined produce materials not only similar physical features but crystallochemical characteristics.
We present a detailed study of static and dynamic magnetic behavior Fe3O4 nanoparticles with average particle sizes 〈d〉 ranging from 5 to 150 nm. Bulk-like properties such as saturation magnetization, hyperfine parameters, coercive field, Verwey transition are observed in nm particles. For decreasing size, the temperature, TV, shifts down ∼20 K for 〈d〉=50 is no longer observable smaller The smallest particles (〈d〉=5 nm) display superparamagnetic at room blocked state TB∼45 K, which depends...
Structural and magnetic properties of γ-Fe2O3 have been studied in isometric nanoparticles ranging from 3 to 14 nm with a narrow particle size distribution. Cation vacancy order is observed for particles larger than 5 diameter giving rise cubic superstructure, while the smallest these vacancies are disordered. All measured showed strong dependence on average crystallite size. For ordered samples, saturation magnetization was found decrease linearly decreasing due surface spin canting effect....
This review summarizes recent advances in synthesis routes for quickly and reliably making functionalizing magnetic nanoparticles applications biomedicine. We put special emphasis on describing synthetic strategies that result the production of nanosized materials with well-defined physical crystallochemical characteristics as well colloidal properties. Rather than grouping information according to route, we have described methods prepare water-dispersible equiaxial sizes below about 10 nm,...
Magnetite nanoparticles (Fe3O4) of three different sizes below the limit for single domain magnetic behaviour have been obtained by thermal decomposition an iron precursor in organic medium presence a surfactant. Good agreement between mean particle size TEM, crystal calculated from x-ray diffraction and diameter magnetization curves measured at room temperature shows that samples consist uniform, crystalline isolated magnetite with 5 11 nm. High saturation high initial susceptibility values...
The natural nanomineral ferrihydrite is an important component of many environmental and soil systems has been implicated as the inorganic core ferritin in biological systems. Knowledge its basic structure, composition, extent structural disorder essential for understanding reactivity, stability, magnetic behavior, well changes these properties during aging. Here we investigate compositional, structural, that occur upon aging “2-line” presence adsorbed citrate at elevated temperature....
The internalization and biocompatibility of iron oxide nanoparticles surface functionalized with four differently charged carbohydrates have been tested in the human cervical carcinoma cell line (HeLa). Neutral, positive, negative were obtained by coating dextran, aminodextran, heparin, dimercaptosuccinic acid, resulting colloidal suspensions stable at pH 7 similar aggregate size. No intracellular uptake was detected cells incubated neutral nanoparticles, while particles showed different...
Magnetite nanoparticles with two different sizes, 5 and 17 nm, have been prepared by the decomposition of organic precursors in an media presence oleic acid. The particles were characterized TEM, X-ray diffraction, IR Mössbauer spectroscopy to clarify their structural physicochemical properties. samples consist noninteracting magnetite both cases a more uniform size distribution higher crystal order degree than similar sizes coprecipitation. A controlled heat treatment air leads...
The specific absorption rate (SAR) of γ-Fe2O3 nanoparticles (NPs) under an alternating magnetic field has been investigated as a function size, concentration, coating, liquid carrier, and frequency amplitude the applied field. NPs have synthesized by coprecipitation method with sizes ranging from 6 to 14 nm low polydispersity (0.2) high crystallinity degrees. small size (6–14 nm) value maximum (<7.5 kA/m) allow use linear response theory for analysis experimental SARs values. Under this...
The oriented attachment of magnetic nanoparticles is recognized as an important pathway in the magnetic-hyperthermia cancer treatment roadmap, thus, understanding physical origin their enhanced heating properties a crucial task for development optimized application schemes. Here, we present detailed theoretical analysis hysteresis losses dipolar-coupled nanoparticle assemblies function both geometry and length array, orientation particles' anisotropy. Our results suggest that chain-like...
Abstract Abundance combined with facile synthesis, easy accessibility to different oxidation states and polymorphs, variety of electronic magnetic properties, low biotoxicity natural elimination make iron oxides a prototype the ideal functional material. In this research news, we briefly describe some fundaments perspectives use in biomedicine, energy storage devices (anodes for lithium ion batteries), photoelectrochemical water splitting other forms catalysis.
Magnetic nanoparticles (MNPs), and in particular iron oxide (mainly magnetite maghemite), are being widely used the form of aqueous colloids for biomedical applications. In such colloids, tend to assemblies, either aggregates, if union is permanent, or agglomerates, it reversible. These clustering processes have a strong impact on MNPs' properties that often not well understood. this review, causes consequences MNPs aggregation/agglomeration reviewed discussed. Special attention has been...
The scientific community has made great efforts in advancing magnetic hyperthermia for the last two decades after going through a sizeable research lapse from its establishment. All progress various topics ranging nanoparticle synthesis to biocompatibilization and vivo testing have been seeking push forefront towards some new clinical trials. As many, they did not go at expected pace. Today, fruitful international cooperation wisdom gain careful analysis of lessons learned seminal trials...
A direct method for the preparation of uniform magnetite nanoparticles with sizes around 30 nm and stable in aqueous media at pH 7 has been developed. This is based on precipitation an iron (II) salt (FeSO4) presence a base (NaOH) mild oxidant (KNO3). Reaction rate seems to be controlled by concentration ethanol media. Thus lower water/ethanol ratio equal one lead formation smallest particles, diameter. Colloidal suspensions these particles were directly obtained simple ultrasonic treatment...
Isolated nanometric particles (D < 30 nm) of γ-Fe2O3 in a silica matrix have been prepared by heating at 400 °C the gel formed hydrolysis an ethanol solution Fe(NO3)3·9H2O and tetraethylorthosilicate (TEOS). However, when FeCl3·6H2O was used as precursor, well-developed hematite were obtained final composite. This different behavior already manifest initial gels. Thus, from iron nitrate salt shows compact appearance result its higher degree network connectivity (polymeric gel) whereas one...