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The investigation of frequency response for the magnetic nanoparticulate assembly induced by time-varied magnetic field.

Sun J, Su Y, Wang C, Gu N - Nanoscale Res Lett (2011)

Bottom Line: It was found that the assembly was dependent upon the difference between colloidal relaxation time and field period.The same experiments on DMSA-coated γ-Fe2O3 nanoparticles exhibited that the relaxation time may be mainly determined by the magnetic size rather than the physical size.Our results may be valuable for the knowledge of dynamic assembly of colloidal particles.

View Article: PubMed Central - HTML - PubMed

Affiliation: State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, PR China. guning@seu.edu.cn.

ABSTRACT
The field-induced assembly of γ-Fe2O3 nanoparticles under alternating magnetic field of different frequency was investigated. It was found that the assembly was dependent upon the difference between colloidal relaxation time and field period. The same experiments on DMSA-coated γ-Fe2O3 nanoparticles exhibited that the relaxation time may be mainly determined by the magnetic size rather than the physical size. Our results may be valuable for the knowledge of dynamic assembly of colloidal particles.

No MeSH data available.


TEM images of bare γ-Fe2O3 nanoparticles (a) and DMSA-coated nanoparticles (b). Dynamic light scattering measurements of bare γ-Fe2O3 nanoparticles (c) and DMSA-coated γ-Fe2O3 nanoparticles (d).
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Figure 1: TEM images of bare γ-Fe2O3 nanoparticles (a) and DMSA-coated nanoparticles (b). Dynamic light scattering measurements of bare γ-Fe2O3 nanoparticles (c) and DMSA-coated γ-Fe2O3 nanoparticles (d).

Mentions: The bare and the DMSA-coated γ-Fe2O3 nanoparticles were both synthesized in our own group (The synthesis process was shown in "Methods" section and the details can be referred to Ref. [5,6]). The nanoparticles were dispersed in pure water, and the pH value was 7. Observed from transmission electron microscopy (TEM) images, the average size of bare nanoparticles was about 11 nm and the DMSA modification seemed to little influence the colloidal size (Figure 1a, b). The hydrodynamic sizes of the bare nanoparticles and the DMSA-coated nanoparticles were about 285 and 103 nm, respectively (Figure 1c, d), meaning that there existed aggregation in both colloidal suspensions more or less. In our experiments, the flux of magnetic field was perpendicular to the substrate supporting colloidal droplet and the field intensity was about 70 kA/m.


The investigation of frequency response for the magnetic nanoparticulate assembly induced by time-varied magnetic field.

Sun J, Su Y, Wang C, Gu N - Nanoscale Res Lett (2011)

TEM images of bare γ-Fe2O3 nanoparticles (a) and DMSA-coated nanoparticles (b). Dynamic light scattering measurements of bare γ-Fe2O3 nanoparticles (c) and DMSA-coated γ-Fe2O3 nanoparticles (d).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211873&req=5

Figure 1: TEM images of bare γ-Fe2O3 nanoparticles (a) and DMSA-coated nanoparticles (b). Dynamic light scattering measurements of bare γ-Fe2O3 nanoparticles (c) and DMSA-coated γ-Fe2O3 nanoparticles (d).
Mentions: The bare and the DMSA-coated γ-Fe2O3 nanoparticles were both synthesized in our own group (The synthesis process was shown in "Methods" section and the details can be referred to Ref. [5,6]). The nanoparticles were dispersed in pure water, and the pH value was 7. Observed from transmission electron microscopy (TEM) images, the average size of bare nanoparticles was about 11 nm and the DMSA modification seemed to little influence the colloidal size (Figure 1a, b). The hydrodynamic sizes of the bare nanoparticles and the DMSA-coated nanoparticles were about 285 and 103 nm, respectively (Figure 1c, d), meaning that there existed aggregation in both colloidal suspensions more or less. In our experiments, the flux of magnetic field was perpendicular to the substrate supporting colloidal droplet and the field intensity was about 70 kA/m.

Bottom Line: It was found that the assembly was dependent upon the difference between colloidal relaxation time and field period.The same experiments on DMSA-coated γ-Fe2O3 nanoparticles exhibited that the relaxation time may be mainly determined by the magnetic size rather than the physical size.Our results may be valuable for the knowledge of dynamic assembly of colloidal particles.

View Article: PubMed Central - HTML - PubMed

Affiliation: State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, PR China. guning@seu.edu.cn.

ABSTRACT
The field-induced assembly of γ-Fe2O3 nanoparticles under alternating magnetic field of different frequency was investigated. It was found that the assembly was dependent upon the difference between colloidal relaxation time and field period. The same experiments on DMSA-coated γ-Fe2O3 nanoparticles exhibited that the relaxation time may be mainly determined by the magnetic size rather than the physical size. Our results may be valuable for the knowledge of dynamic assembly of colloidal particles.

No MeSH data available.