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Science 24 October 1997:
Vol. 278. no. 5338, pp. 655 - 658
DOI: 10.1126/science.278.5338.655
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Reports

Nanotubule-Based Molecular-Filtration Membranes

Kshama B. Jirage, John C. Hulteen, Charles R. Martin *

Polymeric membranes that contain a collection of monodisperse gold nanotubules, with inside diameters of molecular dimensions (less than 1 nanometer), were used in a simple membrane-permeation experiment to cleanly separate small molecules on the basis of molecular size. For example, when such a membrane was presented with an aqueous feed solution containing pyridine (molecular weight 79) and quinine (molecular weight 324), only the smaller pyridine molecule was transported through the nanotubules and into a receiver solution on the other side of the membrane.

Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA.
*   To whom correspondence should be addressed at crmartin{at}lamar.colostate.edu

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