Fibrous aggregation of magnetite nanoparticles induced by a time-varied magnetic field

Angewandte Chemie - International Edition

Volumn 46, Issue 25, 2007, Pages 4767-4770

  Sun, Jianfei ^a   Zhang, Yu ^a   Chen, Zhongping ^a   Zhou, Jie ^a   Gu, Ning ^a  

^a SOUTHEAST UNIVERSITY   (China)

Author keywords

Aggregation; Colloids; Electrostatic interactions; Magnetic properties; Nanoparticles

Indexed keywords

AGGLOMERATION; COLLOIDS; COULOMB INTERACTIONS; MAGNETIC FIELD EFFECTS; MAGNETIC MOMENTS; MAGNETIC PROPERTIES; MAGNETITE;

FIBROUS AGGREGATION; MAGNETITE NANOPARTICLES; STABILIZED COLLOIDS;

NANOPARTICLES;

MAGNETITE; NANOPARTICLE;

ARTICLE; CHEMISTRY; MAGNETISM; NANOTECHNOLOGY; TIME; ULTRASTRUCTURE;

FERROSOFERRIC OXIDE; MAGNETICS; NANOPARTICLES; NANOTECHNOLOGY; TIME FACTORS;

EID: 34347255000     PISSN: 14337851     EISSN: None     Source Type: Journal    
DOI: 10.1002/anie.200604474     Document Type: Article

References (29)

1. a) J. Dutta, H. Hofmann, Encycl. Nanosci. Nanotechnol. 2004, 9, 617-640;
2. b) R. Shenhar, V. M. Rotello, Acc. Chem. Res. 2003, 36, 549-561;
3. c) M. Fialkowski, K. M. Bishop, R. Klajn, S. K. Smoukov, C. J. Campbell, B. A. Grzybowski, J. Phys. Chem. B 2006, 110, 2482-2496;
4. d) G. M. Whitesides, Small 2005, 1, 172-179.
5. a) G. M. Whitesides, M. Boncheva, Proc. Natl. Acad. Sci. USA 2002, 99, 4769-4774;
6. b) M.-P. Pileni, A.-T. Ngo, ChemPhysChem 2005, 6, 1027-1034;
7. c) J. Henzie, J. E. Barton, C. L. Stender, T. W. Odom, Acc. Chem. Res. 2006, 39, 249-257;
8. d) C. M. Niemeyer, Angew. Chem. 2001, 113, 4254-4287;
9. Angew. Chem. Int. Ed. 2001, 40, 4128-4158.
10. a) Z. He, S.-H. Yu, X. Zhou, X. Li, J. Qu, Adv. Funct. Mater. 2006, 16, 1105-1111;
11. b) Y. Xia, P. Yang, Y. Sun, Y. Wu, B. Mayers, B. Gates, Y. Yin, F. Kim, H. Yan, Adv. Mater. 2003, 15, 353-389;
12. c) J. Gao, B. Zhang, X. Zhang, B. Xu, Angew. Chem. 2006, 118, 1242-1245;
13. Angew. Chem. Int. Ed. 2006, 45, 1220-1223;
14. d) J. Sun, Z. Guo, C. Wang, N. Gu, ChemPhysChem 2005, 6, 2485-2488.
15. M. C. Cross, P. C. Hohenberg, Rev. Mod. Phys. 1993, 65, 851-1112.
16. N. R. Jana, Y. Chen, X. Peng, Chem. Mater. 2004, 16, 3931-3935.
17. 4 powder were dispersed in toluene with ultrasonic agitation for 10 min. Then APTS solution (3 mM) was added to the organic suspension with ultrasonic treatment for 20 min, followed by incubation for 4 h at 60°C. Finally, the samples were precipitated by magnetic separation and alternately washed with distilled water and toluene several times. The size of the nanoparticles was estimated as about 10 nm from transmission electron microscopy (TEM) images. For more details, see: M. Ma, Y. Zhang, W. Yu, H. Shen, H. Zhang, N. Gu, Colloids Surf. A 2003, 212, 219-226.
18. Y. Lalatonne, J. Richardi, M. P. Pileni, Nat. Mater. 2004, 3, 121-125.
19. a) J. Wang, Q. W. Chen, C. Zeng, B. Y. Hou, Adv. Mater. 2004, 16, 137-140;
20. b) A. Ngo, M. P. Pileni, J. Phys. Chem. B 2001, 105, 53-58;
21. c) G. Cheng, D. Romero, G. T. Fraser, A. R. High-t Walker, Langmuir 2005, 21, 12055-12059.
22. H. R. Zhai, D. Feng, T. S. Ge, Metal Physics, Vol. 4, Scientific Press, China, 1998.
23. The experimental setup for oleic acid capped nanoparticles is the same as that for APTS-modified samples, but with the addition of a glass cover because of the faster evaporation of toluene. With this modification, the evaporation of toluene is slowed and approximates to that of water.
24. This observation can be partially confirmed by the effect of an alternating magnetic field on a An colloidal solution, which was another project in our laboratory. If a vial of Au colloidal solution was subjected to an alternating magnetic field, the color of the suspension turned from red to blue quickly when the field intensity was high enough.
25. a) F. C. Fannin, S. W. Charles, J. Phys. D 1989, 22, 187-191;
26. b) I. Hrianca, C. Caizer, Z. Schlett, J. Appl. Phys 2002, 92, 2125-2132.
27. a) A. T. Skjeltorp, Phys Rev. Lett. 1983, 51, 2306-2309;
28. b) B. Jones, K. O'Grady, J. Appl. Phys. 1999, 97, 10J312-10J313.
29. K. M. Ryan, A. Mastroianni, K. A. Stancil, H. Liu, A. P. Alivisatos, Nano Lett. 2006, 6, 1479-1482.