title: High precision fractionator for use with density gradient ultracentrifugation.
abstract: The recent application of density gradient ultracentrifugation (DGU) for structural sorting of single-walled carbon nanotube samples has created a need for highly selective extraction of closely spaced layers formed in the centrifuged tube. We describe a novel computer-controlled device designed for this purpose. Through the use of fine needles, systematic needle motions, and slow flow rates, multiple sample layers can be aspirated under program control with minimal cross contamination between layers. The fractionator's performance is illustrated with DGU-sorted samples of single-walled carbon nanotubes.
authors.affiliation: Department of Chemistry and Richard E. Smalley Institute for Nanoscale Science and Technology, Rice University , 6100 Main Street, Houston, Texas 77005, United States.
authors.forename: Yara
authors.initials: Y
authors.lastname: Kadria-Vili
authors.forename: Griffin
authors.initials: G
authors.lastname: Canning
authors.forename: Sergei M
authors.initials: SM
authors.lastname: Bachilo
authors.forename: R Bruce
authors.initials: RB
authors.lastname: Weisman
mesh_terms: D002499:Centrifugation, Density Gradient / Q000295:instrumentation*; D004867:Equipment Design; D037742:Nanotubes, Carbon / Q000032:analysis* / Q000737:chemistry*
chemical_list: D037742:Nanotubes, Carbon