Hosokawa Powder Technology Foundation ANNUAL REPORT
Online ISSN : 2189-4663
ISSN-L : 2189-4663
Research Grant Report
Novel Separation Techinique of Nanoparticles Based on Their Sizes and Surface Chemistry
Tatsuo MARUYAMA
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RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS

2016 Volume 24 Pages 98-102

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Abstract

There are no reports on liquid–liquid extraction of solid nanoparticles based on size- or surface- selective separation. In the present study, we examined phase-transfer of semiconductor nanoparticles in surface- and size- selective manners using reverse micelles and a DNA surfactant. We adopted DNA-functionalized CdTe quantum dots (DNA-QDs) as target solid nanoparticles. The DNA surfactant recognized DNA tethered to QDs and transferred the DNA-QDs to an organic phase via the DNA hybridization. These were successfully applied in the liquid–liquid extraction of DNA-QDs from an aqueous phase to an organic phase in both surface- and size-selective manners. I investigated the size-dependent extraction of the DNA-QDs from a mixture of DNA-QDs with different diameters (4 and 5.5 nm). These two types of DNA-QDs were added to an aqueous phase containing DNA surfactant, followed by the addition of an organic phase containing DLPC and 1-hexanol. Following gentle stirring for 3 h, DNA-QDs with QDs of size 4 nm were preferentially extracted over DNA-QDs with QDs of size 5.5 nm, which were barely extracted. Thus, the present system affords size-selective extraction of DNA-QDs from a mixture of DNA-QDs to an organic phase.

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This article is licensed under a Creative Commons [Attribution 2.1 Japan] license.
https://creativecommons.org/licenses/by/2.1/jp/
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