This research was supported by the National Science Foundation (NSF) through the Center for Nanotechnology in Society at Arizona State University (Award No. 0531194) and NSF Award No. 1064146. The research was also undertaken in collaboration with the Center for Nanotechnology in Society, University of California Santa Barbara (NSF Awards No. 0938099 and No. 0531184). The findings and observations contained in this paper are those of the authors and do not necessarily reflect the views of the NSF.