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Estimating Quantum Dot Size with Pulsed Field Gradient NMR

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Title: Estimating Quantum Dot Size with Pulsed Field Gradient NMR
Language: English
Authors: Hal Van Ryswyk (ORCID 0000-0002-1701-6194), Hanna Z. Porter, Connor K. M. Seto (ORCID 0009-0002-3232-7481), Ixchel Lopez, Emma Dy
Source: Journal of Chemical Education. 2023 100(5):2021-2026.
Availability: Division of Chemical Education, Inc. and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc
Peer Reviewed: Y
Page Count: 6
Publication Date: 2023
Sponsoring Agency: National Science Foundation (NSF), Division of Chemistry (CHE)
Contract Number: 1725142
Document Type: Journal Articles
Reports - Descriptive
Education Level: Higher Education
Postsecondary Education
Descriptors: Chemistry, Science Instruction, Scientific Concepts, Nuclear Energy, Laboratory Experiments, Comparative Analysis, Optics, Undergraduate Students, Measurement Techniques
DOI: 10.1021/acs.jchemed.3c00155
ISSN: 0021-9584
1938-1328
Abstract: Pulsed field gradient nuclear magnetic resonance (NMR) is used to estimate the size of quantum dots (QDs) produced in a simple, fast, small-scale synthesis. This upper-division laboratory experiment teaches the basics of QD synthesis and pulsed field gradient NMR, a powerful technique for measuring diffusion coefficients in solution. The diffusion coefficients are used to calculate hydrodynamic radii, which are compared to core radii obtained from optical absorbance sizing curves, providing insight into the structure of QDs in colloidal suspension and the nature of the information provided by pulsed field gradient NMR.
Abstractor: As Provided
Entry Date: 2024
Accession Number: EJ1445490
Database: ERIC
FullText Text:
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  Data: <searchLink fieldCode="AR" term="%22Hal+Van+Ryswyk%22">Hal Van Ryswyk</searchLink> (ORCID <externalLink term="https://orcid.org/0000-0002-1701-6194">0000-0002-1701-6194</externalLink>)<br /><searchLink fieldCode="AR" term="%22Hanna+Z%2E+Porter%22">Hanna Z. Porter</searchLink><br /><searchLink fieldCode="AR" term="%22Connor+K%2E+M%2E+Seto%22">Connor K. M. Seto</searchLink> (ORCID <externalLink term="https://orcid.org/0009-0002-3232-7481">0009-0002-3232-7481</externalLink>)<br /><searchLink fieldCode="AR" term="%22Ixchel+Lopez%22">Ixchel Lopez</searchLink><br /><searchLink fieldCode="AR" term="%22Emma+Dy%22">Emma Dy</searchLink>
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  Data: Division of Chemical Education, Inc. and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc
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  Data: 10.1021/acs.jchemed.3c00155
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  Data: 0021-9584<br />1938-1328
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  Data: Pulsed field gradient nuclear magnetic resonance (NMR) is used to estimate the size of quantum dots (QDs) produced in a simple, fast, small-scale synthesis. This upper-division laboratory experiment teaches the basics of QD synthesis and pulsed field gradient NMR, a powerful technique for measuring diffusion coefficients in solution. The diffusion coefficients are used to calculate hydrodynamic radii, which are compared to core radii obtained from optical absorbance sizing curves, providing insight into the structure of QDs in colloidal suspension and the nature of the information provided by pulsed field gradient NMR.
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