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Salt-Induced, Continuous Deposition of Supramolecular Iron(III)-Tannic Acid Complex
- Title
- Salt-Induced, Continuous Deposition of Supramolecular Iron(III)-Tannic Acid Complex
- Authors
- Park, Taegyun; Kim, Won Il; Kim, Beom Jin; Lee, Hojae; Choi, Insung S.; Park, Ji Hun; Cho, Woo Kyung
- Ewha Authors
- 박지훈
- SCOPUS Author ID
- 박지훈
- Issue Date
- 2018
- Journal Title
- LANGMUIR
- ISSN
- 0743-7463
- Citation
- LANGMUIR vol. 34, no. 41, pp. 12318 - 12323
- Publisher
- AMER CHEMICAL SOC
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- One-step assembly of iron(III)-tannic acid (Fe3+-TA) complex forms nanothin (similar to 10 nm) films on various substrates within minutes. In this deposition scheme, however, the film does not grow continuously over time even though Fe3+-TA complex is still abundant in the coating solution. In this paper, we report that the salt addition dramatically changes the one-off coating characteristic to continuous one, and each salt has its optimum concentration (C-MFT) that produces maximum film thickness. For detailed investigation of the salt effects, we employed various salts, including LiCl, NaCl, KCl, CaCl2, SrCl2, BaCl2, NaBr, and NaNO3, and found that only cations played an important role in the continuous deposition of the Fe3+-TA complex, with smaller C-MFT values for the cations of higher valency and larger size. On the basis of the results, we suggested that the positively charged cations screened the negative surface charges of Fe3+-TA complex particles, leading to coagulation and continuous deposition, further supported by the zeta-potential measurement and time-resolved dynamic light-scattering analysis.
- DOI
- 10.1021/acs.langmuir.8b02686
- Appears in Collections:
- 사범대학 > 과학교육과 > Journal papers
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