Purification of nanocrystals by gel permeation chromatography and the effect of excess ligands on shell growth and ligand exchange
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United States of America Patent
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Mar 27, 2018
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Jun 27, 2014
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Jun 28, 2013
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Abstract
Methods for purifying nanocrystals via gel permeation chromatography are provided. The method can include: loading a sample solution into a chromatography column, wherein the sample solution comprises nanocrystals coated with a layer of organic ligands; using an eluent, passing the nanocrystals coated with the layer of organic ligands through a stationary phase of the chromatography column, wherein the eluent is an organic solvent in which the nanocrystals coated with the layer of organic ligands remain miscible to form a mobile phase; and collecting the mobile phase passed through the stationary phase of the chromatography column. The surface ligands of the purified nanocrystals can then be, in one embodiment, replaced with a second type of ligand.
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