期刊論文
| 學年 | 113 |
|---|---|
| 學期 | 2 |
| 出版（發表）日期 | 2025-06-02 |
| 作品名稱 | Detecting copper ions in aqueous solutions through interfacial potential modulation in liquid crystal-based sensors |
| 作品名稱（其他語言） | |
| 著者 | Jhih-Wei Huang; Chih-Hsin Chen |
| 單位 | |
| 出版者 | |
| 著錄名稱、卷期、頁數 | Microchemical Journal 215, p.114174 |
| 摘要 | This study introduces a novel liquid crystal (LC)-based sensor designed for copper ion detection by enhancing the potential at the LC/aqueous interface. The sensor employs an amphiphilic molecular probe, 2-(4′-pentyl-[1,1′-biphenyl]-4-yl)-4,5-dihydro-1H-imidazole (5CB-imid), doped into 4-cyano-4′-pentylbiphenyl (5CB) to create copper-selective LCs. At the LC/aqueous interface, the specific interaction between copper ions and 5CB-imid increases the interfacial potential, promoting a homeotropic orientation of the LCs and resulting in a distinct bright-to-dark transition in the optical signal. Zeta potential measurements confirm the increase in surface potential upon copper ion binding, and X-ray photoelectron spectroscopy verifies the presence of copper ions at the interface, supporting the proposed detection mechanism. The sensor achieves a lowest detectable concentration of 5 μM, well below the U.S. EPA’s permissible limit of 20 μM for drinking water and exhibits high selectivity, as it does not interact with other common divalent ions. Unlike other optical sensors, this LC-based system operates without the need for sample pre-mixing, making it highly practical for on-site applications. Its effectiveness was further validated through successful detection of copper ions in wastewater samples from an electroplating factory, showing reliable performance comparable to atomic absorption spectroscopy. Overall, this LC-based sensor offers a sensitive, selective, and efficient approach for environmental monitoring of copper ion contamination in industrial wastewater. |
| 關鍵字 | Liquid crystal sensor; Copper ion detection; Zeta potential; Heavy metal sensing; 5CB-imid |
| 語言 | en |
| ISSN | 0026-265X |
| 期刊性質 | 國外 |
| 收錄於 | SCI |
| 產學合作 | |
| 通訊作者 | Chih-Hsin Chen |
| 審稿制度 | 是 |
| 國別 | NLD |
| 公開徵稿 | |
| 出版型式 | ,電子版 |
| 相關連結 |
機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/127905 ) |