wolbring

Sorting Nanotube Isomers

In nano on May 18, 2007 at 11:09 pm

Optical isomers of single-walled carbon nanotubes (SWNTs) now can be sorted from one another for the first time, thanks to a pair of chiral diporphyrin “tweezers” developed by researchers in Japan (Nat. Nanotechnol., DOI: 10.1038/nnano.2007.142). Commercially available SWNTs usually are a jumble of nanotubes of various lengths and diameters, and this lack of uniformity can make product development difficult. Nanotubes also possess a helical twist-either right- or left-handed-that gives them optical activity. Using one or the other of the chiral diporphyrin molecules, a group led by Xiaobin Peng and Naoki Komatsu of Shiga University of Medical Science was able to separate the optical isomers. The sorting process takes advantage of the diporphyrins’ affinity to bind more tightly to one of the two helices (one diporphyrin shown). The researchers suspended the SWNTs and a chiral diporphyrin in methanol, followed by sonication and centrifugation. The resulting supernatant liquid is enriched with the preferred diporphyrin-SWNT complex. The diporphyrin is easily washed away, leaving behind the SWNT isomer.

more at source

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: