Los Alamos National Security, LLC

Sandip Niyogi

Stephen K Doorn

A mixture of single-walled carbon nanotubes ('SWNTs') is separated into fractions of enriched chirality by preparing an aqueous suspension of a mixture of SWNTs and a surfactant, injecting a portion of the suspension on a column of separation medium having a density gradient, and centrifuging the column. In some embodiments, salt is added prior to centrifugation. In other embodiments, the centrifugation is performed at a temperature below room temperature. Fractions separate as colored bands in the column. The diameter of the separated SWNTs decreases with increasing density along the gradient of the column. The colored bands can be withdrawn separately from the column.

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Los Alamos, NM, United States of America

Sandip Niyogi