| Autor: |
Swaminathan, Vikhram Vilasur, Dak, Piyush, Reddy Jr, Bobby, Salm, Eric, Duarte-Guevara, Carlos, Zhong, Yu, Fischer, Andrew, Liu, Yi-Shao, Bashir, Rashid |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Birck and NCN Publications |
| Popis: |
The ability to control the ionic environment in saline waters and aqueous electrolytes is useful for desalination as well as electronic biosensing. We demonstrate a method of electronic desalting at micro-scale through on-chip micro electrodes. We show that, while desalting is limited in bulk solutions with unlimited availability of salts, significant desalting of ≥1 mM solutions can be achieved in sub-nanoliter volume droplets with diameters of ∼250 μm. Within these droplets, by using platinum-black microelectrodes and electrochemical surface treatments, we can enhance the electrode surface area to achieve >99% and 41% salt removal in 1 mM and 10 mM salt concentrations, respectively. Through self-consistent simulations and experimental measurements, we demonstrate that conventional double-layer theory over-predicts the desalting capacity and, hence, cannot be used to model systems that are mass limited or undergoing significant salt removal from the bulk. Our results will provide a better understanding of capacitive desalination, as well as a method for salt manipulation in high-throughput droplet-based microfluidic sensing platforms. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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