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Journal of Sensors
Volume 2010 (2010), Article ID 691585, 8 pages
http://dx.doi.org/10.1155/2010/691585
Research Article

The Adsorption Properties of Bacillus atrophaeus Spore on Functionalized Carbon Nanotubes

1Department of Civil/Environmental & Chemical Engineering, One University Plaza, Youngstown State University, Youngstown, OH 44555, USA
2Department of Chemical Engineering, South Horseshoe, Jett Hall, New Mexico State University, Las Cruces, NM 88003, USA
3Department of Biology, South Horseshoe, Foster Hall, New Mexico State University, Las Cruces, NM 88003, USA

Received 20 May 2010; Accepted 6 July 2010

Academic Editor: Kourosh Kalantar-Zadeh

Copyright © 2010 P. Cortes et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

An equilibrium study of Bacillus atrophaeus (B.a) spores on functionalized Single-Wall Carbon Nanotubes (SWCNTs) has been performed in order to characterize the adsorption properties of the spores/nanotubes complex. The carbon nanotubes here investigated were subjected to a two-step purification and functionalization treatment in order to introduce chemical groups on their basal planes. The inclusion of carboxyl functional groups on the nanotubes was corroborated by Raman and infrared spectroscopy. These carboxyl groups appear to enhance the nanotube-B.a. interaction by reacting with the proteinaceous pili appendages present on the spore surface. The adsorption data demonstrate that bacillus spores diffuse faster on functionalized carbon nanotubes than on as-received and purified nanomaterials. Transmission Electron Microscopy also shows that the chemically treated nanotubes resulted in a swollen nano-network which seems to further enhance the bacillus adsorption due to a more extensive spore-nanotube contact area.