Skip to main content Accessibility help

Fabrication of Nanoparticles and Microspheres with Uniform Magnetic Half-Shells

  • Brandon H. McNaughton (a1), Vladimir A. Stoica (a2), Jeffrey N. Anker (a3), Katherine M. Tyner (a4), Roy Clarke (a5) and Raoul Kopelman (a6)...


We report a method for fabricating, anisotropically designed, multiphasic nano-particles with uniform magnetic half-shells. Cobalt layers were deposited onto commercially made non-magnetic polystyrene nanospheres and microspheres, using ultrahigh vacuum vapor deposition, which produced particles with a half-shell of uniform size, shape and magnetic content. Iron was also deposited onto commercially made silica nanospheres and microspheres and was characterized using transmission electron microscopy and scanning electron microscopy. The coercivity of the magnetic material layers, on the substrate-supported spheres, was enhanced compared to the bulk values of such films without spheres. The particles, once removed from the substrate, were amenable to being rotated in solution, which could allow for more accurate physical and chemical measurements in a variety of fluidic environments. Applications for imaging local mechanical, magnetic and electrical environments are also delineated.



Hide All
[1] Lukaszew, R. A., McNaughton, B.H., Stoica, V., Clarke, R.. Mat. Res. Soc. Symp. Proc 696, N3.29 (2002).
[2] Monson, E., Brasuel, M., Philbert, M.A., et al. In Biomedical Photonics Handbook; Vo-Dinh, T., Ed.; CRC Press: Boca Raton, FL, 2003.
[3] Liu, S. Q., Wang, Q., Van Der Voort, P., et al. J. Magn. Magn. Mater. 280, 31 (2004).
[4] Park, J., An, K., Hwang, Y., et al. Nature Materials 3, 891 (2004).
[5] Wang, C. J., and Shah, D.. Process To Make Magnetically Responsive Fluorescent Polymer Particles U.S., 1995.
[6] Tartaj, P., Morales, M. d. P., Veintemillas-Verdaguer, S., Gonzalez-Carreno, T., and Serna, C. J.. J. Phys. D. Appl. Phys. 36, R182 (2003).
[7] Häfeli, U. O., Ciocan, R., and Dailey, J.P.. European Cells and Materials 3, 34 (2002).
[8] Long, D.P., Patterson, C.H., Moore, M.H., Seferos, D.S., Bazan, G.C., and Kushmerick, J.G.. Appl. Phys. Lett. 86, 153105 (2005).
[9] Love, J.C., Gates, B.D., Wolfe, D.B., Paul, K.E., and Whitesides, G.M.. Nano Lett. 2, 891 (2002).
[10] Hulteen, J. C., Van Duyne, R.P.. J. Vac. Sci. Technol. A 13, 1553 (1995).
[11] Choi, D.-G., Kim, S., Jang, S.-G., Yang, S.-M., Jeong, J.-R., and Shin, S.-C.. Chem. Mater. 16, 4208 (2004).
[12] Anker, J. N., and Kopelman, R.. Appl. Phys. Lett. 82, 1102 (2003).
[13] Paunov, V. N., and Cayre, O.J.. Adv. Mater. 16, 788 (2004).
[14] Lu, Y., Liu, G. L., Kim, J., Mejia, Y. X., and Lee, L. P.. Nano Lett. 5, 119 (2005).
[15] Takei, H., and Shimizu, N.. Langmuir 13, 1865 (1997).
[16] Anker, J. N., Horvath, T, and Kopelman, R.. European Cells and Materials 3, 34 (2002).
[17] Anker, J. N., Behrend, C., and Kopelman, R.. J. Appl. Phys. 93, 6698 (2003).
[18] Anker, J.N., Behrend, C.J., McNaughton, B.H., Roberts, T. G., Brasuel, M., Philbert, M. A. and Kopelman, R.. Mat. Res. Soc. Symp. Proc. 790, 4.4.1 (2004).
[19] Behrend, C. J., Anker, J.N., McNaughton, B.H., Brasuel, M., Philbert, M.A., and Kopelman, R.. J. Phys. Chem. B 108, 10408 (2004).
[20] Behrend, C. J. Anker, J.N., McNaughton, B.H., and Kopelman., R. J. Magn. Magn. Mater. 293, 663 (2005).
[21] Roberts, T. G., Anker, J. N., Kopelman, R.. J. Magn. Magn. Mater. 293, 715 (2005).
[22] Anker, J. N., Behrend, C.J., and Kopelman, R.. J. Magn. Magn. Mater. 293, 655 (2005).
[23] Choi, J., Zhao, Y., Zhang, K., Chien, S., and Lo, Y.-H.. Nano Lett. 3, 995 (2003).
[24] Albrecht, M., Hu, G., Guhr, I. L., Ulbrich, T. C., Boneberg, J., Leiderer, P., and Schatz, G.. Nat. Mater. 4, 203 (2005).
[25] Strogatz, S.H. Nonlinear dynamics and chaos; Westview Press: Cambridge, MA, 2000.
[26] McNaughton, B. H., Kehbein, K., Anker, J. N., Kopelman, R.. Submitted to J. Phys. Chem. B (2006).



Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed