Universal one-pot, one-step synthesis of core-shell nanocomposites with self-assembled tannic acid shell and their antibacterial and catalytic activities
Facile synthesis of metal@polymer nanocomposites were achieved using self‐assembled tannic acid (TA) shells without crosslinkers. The TA shell was assembled under mildly alkaline conditions in reaction time of 20 min under constant vortexing. Universal synthesis method was demonstrated by the synthe...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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2019
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| Online Access: | https://hdl.handle.net/10356/93522 http://hdl.handle.net/10220/49931 |
| _version_ | 1811691957129314304 |
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| author | Fang, Yan Tan, Jiajun Lan, Tian Foo, Stanley Guo Feng Pyun, Do Gi Lim, Sierin Kim, Dong-Hwan |
| author2 | School of Chemical and Biomedical Engineering |
| author_facet | School of Chemical and Biomedical Engineering Fang, Yan Tan, Jiajun Lan, Tian Foo, Stanley Guo Feng Pyun, Do Gi Lim, Sierin Kim, Dong-Hwan |
| author_sort | Fang, Yan |
| collection | NTU |
| description | Facile synthesis of metal@polymer nanocomposites were achieved using self‐assembled tannic acid (TA) shells without crosslinkers. The TA shell was assembled under mildly alkaline conditions in reaction time of 20 min under constant vortexing. Universal synthesis method was demonstrated by the synthesis of Ag@TA and Au@TA nanocomposites. We propose that the shell formation is due to TA undergoing oxidative self‐polymerization to poly(tannic acid) or a supramolecular aggregate of oxidized TA held together by charge transfer, hydrogen bond, and π–π interactions, similar to dopamine polymerization. Gibbs free energy calculations suggest that polymerization is energetically favorable. Synthesized Ag@TA exhibited antibacterial functionality with Escherichia coli minimum inhibitory concentration of 100 µg mL−1 up to 48 h. The population of E. coli was also reduced by 99% within 5 h when incubated with 100 µg mL−1 of Ag@TA nanocomposite. Au@TA also functions as a reduction catalyst. It reduces 4‐nitrophenol to 4‐aminophenol in the presence of NaBH4 with a rate constant of k = 0.63 min−1 μmol−1. For comparison, using Au nanoparticles yields a rate constant of 0.14 min−1 μmol−1. The ease of synthesis renders the nanocomposites superior to others, with potential for large‐scale application. |
| first_indexed | 2024-10-01T06:28:08Z |
| format | Journal Article |
| id | ntu-10356/93522 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:28:08Z |
| publishDate | 2019 |
| record_format | dspace |
| spelling | ntu-10356/935222023-12-29T06:50:47Z Universal one-pot, one-step synthesis of core-shell nanocomposites with self-assembled tannic acid shell and their antibacterial and catalytic activities Fang, Yan Tan, Jiajun Lan, Tian Foo, Stanley Guo Feng Pyun, Do Gi Lim, Sierin Kim, Dong-Hwan School of Chemical and Biomedical Engineering Engineering::Chemical engineering Applications Bioengineering Facile synthesis of metal@polymer nanocomposites were achieved using self‐assembled tannic acid (TA) shells without crosslinkers. The TA shell was assembled under mildly alkaline conditions in reaction time of 20 min under constant vortexing. Universal synthesis method was demonstrated by the synthesis of Ag@TA and Au@TA nanocomposites. We propose that the shell formation is due to TA undergoing oxidative self‐polymerization to poly(tannic acid) or a supramolecular aggregate of oxidized TA held together by charge transfer, hydrogen bond, and π–π interactions, similar to dopamine polymerization. Gibbs free energy calculations suggest that polymerization is energetically favorable. Synthesized Ag@TA exhibited antibacterial functionality with Escherichia coli minimum inhibitory concentration of 100 µg mL−1 up to 48 h. The population of E. coli was also reduced by 99% within 5 h when incubated with 100 µg mL−1 of Ag@TA nanocomposite. Au@TA also functions as a reduction catalyst. It reduces 4‐nitrophenol to 4‐aminophenol in the presence of NaBH4 with a rate constant of k = 0.63 min−1 μmol−1. For comparison, using Au nanoparticles yields a rate constant of 0.14 min−1 μmol−1. The ease of synthesis renders the nanocomposites superior to others, with potential for large‐scale application. Accepted version 2019-09-12T06:52:13Z 2019-12-06T18:40:47Z 2019-09-12T06:52:13Z 2019-12-06T18:40:47Z 2017 Journal Article Fang, Y., Tan, J., Lan, T., Foo, S. G. F., Pyun, D. G., Lim, S., & Kim, D.-H. (2018). Universal one-pot, one-step synthesis of core-shell nanocomposites with self-assembled tannic acid shell and their antibacterial and catalytic activities. Journal of Applied Polymer Science, 135(6), 45829-. doi:10.1002/app.45829 0021-8995 https://hdl.handle.net/10356/93522 http://hdl.handle.net/10220/49931 10.1002/app.45829 en Journal of Applied Polymer Science This is the peer reviewed version of the following article: Fang, Y., Tan, J., Lan, T., Foo, S. G. F., Pyun, D. G., Lim, S., & Kim, D.-H. (2018). Universal one-pot, one-step synthesis of core-shell nanocomposites with self-assembled tannic acid shell and their antibacterial and catalytic activities. Journal of Applied Polymer Science, 135(6), 45829-., which has been published in final form at https://doi.org/10.1002/app.45829. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. 38 p. application/pdf |
| spellingShingle | Engineering::Chemical engineering Applications Bioengineering Fang, Yan Tan, Jiajun Lan, Tian Foo, Stanley Guo Feng Pyun, Do Gi Lim, Sierin Kim, Dong-Hwan Universal one-pot, one-step synthesis of core-shell nanocomposites with self-assembled tannic acid shell and their antibacterial and catalytic activities |
| title | Universal one-pot, one-step synthesis of core-shell nanocomposites with self-assembled tannic acid shell and their antibacterial and catalytic activities |
| title_full | Universal one-pot, one-step synthesis of core-shell nanocomposites with self-assembled tannic acid shell and their antibacterial and catalytic activities |
| title_fullStr | Universal one-pot, one-step synthesis of core-shell nanocomposites with self-assembled tannic acid shell and their antibacterial and catalytic activities |
| title_full_unstemmed | Universal one-pot, one-step synthesis of core-shell nanocomposites with self-assembled tannic acid shell and their antibacterial and catalytic activities |
| title_short | Universal one-pot, one-step synthesis of core-shell nanocomposites with self-assembled tannic acid shell and their antibacterial and catalytic activities |
| title_sort | universal one pot one step synthesis of core shell nanocomposites with self assembled tannic acid shell and their antibacterial and catalytic activities |
| topic | Engineering::Chemical engineering Applications Bioengineering |
| url | https://hdl.handle.net/10356/93522 http://hdl.handle.net/10220/49931 |
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