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Determination of zeta-potential, charge, and number of organic ligands on the surface of water soluble quantum dots by capillary electrophoresis
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SYSNO ASEP 0448943 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Determination of zeta-potential, charge, and number of organic ligands on the surface of water soluble quantum dots by capillary electrophoresis Author(s) Voráčová, Ivona (UIACH-O) RID, ORCID
Klepárník, Karel (UIACH-O) RID, ORCID
Lišková, Marcela (UIACH-O)
Foret, František (UIACH-O) RID, ORCIDNumber of authors 4 Source Title Electrophoresis. - : Wiley - ISSN 0173-0835
Roč. 36, č. 6 (2015), s. 867-874Number of pages 8 s. Publication form Print - P Language eng - English Country DE - Germany Keywords CE ; LIF ; zeta-potential ; quantum dots Subject RIV CB - Analytical Chemistry, Separation R&D Projects GA14-28254S GA ČR - Czech Science Foundation (CSF) Institutional support UIACH-O - RVO:68081715 UT WOS 000351549900003 DOI 10.1002/elps.201400459 Annotation The number of charges and/or organic ligands covalently attached to the surface of CdTe quantum dot nanoparticles has been determined from their electrophoretic mobilities measured in capillaries filled with free electrolyte buffers. Three sizes of water soluble CdTe quantum dots with 3-mercaptopropionic and thioglycolic acids as surface ligands were prepared. Their electrophoretic mobilities in different pH and ionic strength values of separation buffers were measured by capillary electrophoresis with laser induced fluorescence detection. The -potentials determined from electrophoretic mobilities using analytical solution of Henry function proposed by Ohshima were in the range from −30 to −100 mV. Charges of QDs were calculated from -potentials. As a result, numbers of organic ligands bonded to QDs surface were determined to be 13, 14, and 15 for the sizes of 3.1, 3.5, and 3.9 nm, respectively. The dissociation constants of organic ligands bonded on QDs surfaces estimated from the dependence of QDs charge on pH of the separation buffer were 7.8 and 7.9 for 3-mercaptopropionic acid and 6.9 for thioglycolic acid. Workplace Institute of Analytical Chemistry Contact Iveta Drobníková, drobnikova@iach.cz, Tel.: 532 290 234 Year of Publishing 2016
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