English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/8445
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Exportar a otros formatos:


Low-Gradient Magnetophoresis through Field-Induced Reversible Aggregation

AuthorsCuevas, Gemma de las; Faraudo, Jordi ; Camacho, Juan
KeywordsLow gradient magnetophoresis
Superparamagnetic nanoparticles
Reversible aggregation
Magnetic Bjerrum length
Materials Science
Issue Date8-Jan-2008
PublisherAmerican Chemical Society
CitationJ. Phys. Chem. C 112(4): 945 -950 (2008)
AbstractRecent experiments (Yavuz, C. T. et al., Science 2006, 314, 964) show the possibility of low gradient magnetophoretic separation of superparamagnetic nanoparticles in aqueous solution, a process with broad potentially important applications ranging from biomedicine to environmental waste and pollutants removal. Here, we show that the key to low gradient magnetophoresis is the existence of a cooperative mechanism (reversible aggregation) which fuels the magnetophoresis process. The interplay between the different factors determining low gradient magnetophoresis (magnetization of particles, size, ...) is consistently described by a magnetic analogous to the Bjerrum length concept. This concept allows us to formulate a simple criterion predicting the onset of low gradient magnetophoresis separation as a function of the sample properties (e.g., minimum particle radius). These predictions are in agreement with experimental observations. The kinetics of the process depends not only on the properties of the particles but also on concentration. The observed separation times are orders of magnitude shorter than the predictions of present models based on the approximation of noninteracting particles. The separation times of samples with different concentrations and different particles can be described with a unique curve depending on the magnetic Bjerrum length and the concentration.
Description6 pages, 6 figures.
Publisher version (URL)http://dx.doi.org/10.1021/jp0755286
Appears in Collections:(ICMAB) Artículos
Files in This Item:
There are no files associated with this item.
Show full item record
Review this work

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.