| 초록 |
The flow of water such as hydropower generation, wastewater purification is usually made by height difference or power unit. Herein, using hydrogel composites,we can make novel water pumping system that operates with temperature changes. In this study, water swelling and deswelling were controlled by thermosensitive poly(N-isopropylacrylamide)(PNIPAm) hydrogel and polydimethylsiloxane(PDMS) composites. The composites were prepared by directional freezing of PNIPAm hydrogel to make cylindrical pores, and subsequent infiltration of PDMS to the end of PNIPAm. The composites can repeat deswelling and swelling following temperature cycles. When they deswell, water droplet can form on the surface of PNIPAm. The PNIPAm/PDMS phase at the end of hydrogel acts as one-way flow valve, and water can't backflow through PNIPAm/PDMS phase,only roll over the substrate.The successfully prepared one-way water flow system using PNIPAm/PDMS hydrogel composites can be utilized in various water applications. |
