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Issue 9, 2016
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Gel permeation chromatography as a multifunctional processor for nanocrystal purification and on-column ligand exchange chemistry

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Abstract

This article illustrates the use of gel permeation chromatography (GPC, organic-phase size exclusion chromatography) to separate nanocrystals from weakly-bound small molecules, including solvent, on the basis of size. A variety of colloidal inorganic nanocrystals of different size, shape, composition, and surface termination are shown to yield purified samples with greatly reduced impurity concentrations. Additionally, the method is shown to be useful in achieving a change of solvent without requiring precipitation of the nanocrystals. By taking advantage of the different rates at which small molecules and nanoparticles travel through the column, we show that it is furthermore possible to use the GPC column as a multi-functional flow reactor that can accomplish in sequence the steps of initial purification, ligand exchange with controlled reactant concentration and interaction time, and subsequent cleanup without requiring a change of phase. This example of process intensification via GPC is shown to yield nearly complete displacement of the initial surface ligand population upon reaction with small molecule and macromolecular reactants to form ligand-exchanged nanocrystal products.

Graphical abstract: Gel permeation chromatography as a multifunctional processor for nanocrystal purification and on-column ligand exchange chemistry

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Publication details

The article was received on 23 Mar 2016, accepted on 20 May 2016 and first published on 25 May 2016


Article type: Edge Article
DOI: 10.1039/C6SC01301E
Citation: Chem. Sci., 2016,7, 5671-5679
  • Open access: Creative Commons BY-NC license
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    Gel permeation chromatography as a multifunctional processor for nanocrystal purification and on-column ligand exchange chemistry

    Y. Shen, A. Roberge, R. Tan, M. Y. Gee, D. C. Gary, Y. Huang, D. A. Blom, B. C. Benicewicz, B. M. Cossairt and A. B. Greytak, Chem. Sci., 2016, 7, 5671
    DOI: 10.1039/C6SC01301E

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