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 |
| 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 |
| 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. |
|---|---|
| ISSN: | 0021-9584 1938-1328 |
| DOI: | 10.1021/acs.jchemed.3c00155 |
