期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 134, 期 38, 页码 15688-15691出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja307270d
关键词
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资金
- National Science Foundation [DMR-0820404, CBET-1014673]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1014673] Funding Source: National Science Foundation
We discuss a set of smart micropumps that sense their surrounding environment and respond accordingly. First we show that crystallites of a photoacid generator function as micropumps in the presence of UV light via diffusiophoresis and can be turned on/off in a controlled manner. The pump can be restarted multiple times simply by re-illumination. The electroosmotic component was distinguished from the diffusiophoretic component and compared. We also demonstrate patterning. Second, we show that a polymeric imine can also work as a micropump in acidic environment wherein the velocity can be controlled by controlling the pH and, in turn, the ion gradient; the highest velocities are achieved at the lowest pH. Finally, we combined the photoacid and polyimine pumps to create a colloidal photodiode, where we attain both spatial and temporal control over colloidal transport and obtain amplification along with rectification.
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