Salt-Induced, Continuous Deposition of Supramolecular Iron(III)-Tannic Acid Complex

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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.
Publisher
AMER CHEMICAL SOC
Issue Date
2018-10
Language
English
Article Type
Article
Citation

LANGMUIR, v.34, no.41, pp.12318 - 12323

ISSN
0743-7463
DOI
10.1021/acs.langmuir.8b02686
URI
http://hdl.handle.net/10203/246537
Appears in Collection
CH-Journal Papers(저널논문)
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