Horizontal low gradient magnetophoresis behaviour of iron oxide nanoclusters at...

• Author(s): Benelmekki, M. ; Caparrós Vásquez, Cristina Maria ; Montràs, A. ; Gonçalves, Renato Ferreira ; Lanceros-Méndez, S. ; Martínez, Ll.
• Date: 2011
• Persistent ID: http://hdl.handle.net/1822/16398
• Origin: RepositóriUM - Universidade do Minho
• Subject(s): Magnetic nanoparticles; Citric acid; Surface potential; Silica coated nanoclusters; Reversible aggregation
• Document Type: Article
• Language: English

Description

In this work the use of Horizontal Low Gradient Magnetic Field (HLGMF) (<100T/m) for filtration, control and separation of synthesized magnetic nanoparticles (NPs) is investigated. The characteristics of the suspension, size and type of the NPs are considered and discussed. For these purposes, Fe2O3 silica coated nanoclusters of about 150 nm are synthesized by co-precipitation, monodispersion and silica coating. SQUID, TEM, XRD, and z potential techniques were used to characterize the synthesized nanoclusters. An extensive magnetophoresis study was performed at different magnetophoretical conditions. Different reversible aggregation times were observed at different HLGMF, at each step of the synthesis route. In particular, differences of several orders of magnitude were observed when comparing citric acid modified NPs with silica coated nanoclusters . Reversible aggregation times are correlated to the properties of the NPs at different steps of synthesis route.