期刊
ANALYTICAL CHEMISTRY
卷 90, 期 12, 页码 7715-7720出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.8b01623
关键词
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资金
- Nanostructures for Electrical Energy Storage (NEES), an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences [DESC0001160]
There are many applications that require the integration of a pump and a chemical sensor so that the solution being pumped can be analyzed in real time for a specific chemical species and the flow adjusted according to the measured concentration of that species. We describe here an alternative strategy: a chemoresponsive pump where a single device acts as both the sensor and pump simultaneously. We demonstrate this concept with a nanofluidic Pb2+-responsive pump that uses electroosmotic flow as the pumping technology, and a Pb2+-binding ionophore that allows the device to selectively respond to Pb2+. The pump yields high flow rates at low Pb2+ concentrations (<1 mu M), but flow rate decreases with concentrations above this threshold and ultimately goes to zero at concentrations above 100 mu M.
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