Salt-Induced, Continuous Deposition of Supramolecular Iron(III)–Tannic Acid Complex
| Autor: | Insung S. Choi, Won Il Kim, Beom Jin Kim, Taegyun Park, Woo Kyung Cho, Ji Hun Park, Hojae Lee |
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| Rok vydání: | 2018 |
| Předmět: |
inorganic chemicals
Inorganic chemistry Supramolecular chemistry Salt (chemistry) 02 engineering and technology engineering.material 01 natural sciences chemistry.chemical_compound Coating Tannic acid Electrochemistry Coagulation (water treatment) General Materials Science Surface charge Spectroscopy chemistry.chemical_classification 010405 organic chemistry Chemistry Valency Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences engineering 0210 nano-technology Deposition (chemistry) |
| Zdroj: | Langmuir. 34:12318-12323 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/acs.langmuir.8b02686 |
| Popis: | One-step assembly of iron(III)-tannic acid (Fe3+-TA) complex forms nanothin (∼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 ( CMFT) 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 CMFT 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 ζ-potential measurement and time-resolved dynamic light-scattering analysis. |
| Databáze: | OpenAIRE |
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