Massively parallel fabrication and characterization of DNA templated magnetic wires

PHYS 289

Albena Ivanisevic, albena@purdue.edu, Biomedical Engineering and Chemistry, Purdue University, West Lafayette, IN 47907 and Joseph M. Kinsella, jkinsel@purdue.edu, Department of Biomedical Engineering, Purdue University.
The structure and magnetic properties of different types of templated wires are compared in this study. A long DNA molecule was used to guide the assembly of pyrrolidinone capped Fe2O3 and CoFe2O3 particles, as well as poly-lysine coated gold nanoparticles. The resulting DNA templated wires were stretched onto silicon oxide surfaces using a receding meniscus procedure. The coated, stretched and surface bound wires were characterized using atomic force microscopy (AFM), magnetic force microscopy (MFM), and spectroscopic methods. The results with respect to the wire properties were correlated with those determined from the bulk properties of the nanoparticles and with the properties of the bulk DNA. The MFM measurements allowed us to visualize the formation of domains along the wires, as well as qualitatively compare the magnetic properties of each templated structure. In nature DNA is a dynamic molecule regulated, reproduced, and destroyed using a host of enzymatic reactions. This report will also describe how templated DNA can be used as a dynamic material scaffold capable of being enzymatically reduced to smaller fragments, and subsequently re – joined to become a long strand.
 

Nanostructured Materials
1:20 PM-5:00 PM, Wednesday, April 9, 2008 Morial Convention Center -- Rm. 338, Oral

Division of Physical Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008