期刊
ADVANCED SCIENCE
卷 4, 期 6, 页码 -出版社
WILEY
DOI: 10.1002/advs.201700028
关键词
elastic sponges; liquid transport; microfluidics; pumping; surface modification
资金
- National Natural Science Foundation of China [21674064, 21404072, 21605104]
- Shenzhen Science and Technology Foundation [JCYJ20160520173802186, JCYJ20140418182819116]
- Natural Science Foundation of SZU [827000040, 201447]
- Student's Platform for Innovation and Entrepreneurship Training Program [201610590016]
A bio-inspired, leaf-like pumping strategy by mimicking the transpiration process through leaves is developed for autonomous and continuous liquid transport enabled by durable hydrophilic sponges. Without any external power sources, flows are continuously generated ascribed to the combination of capillary wicking and evaporation of water. To validate this method, durable hydrophilic polydimethylsiloxane sponges modified with polyvinyl alcohol via a dip-coat-dry method have been fabricated, which maintains hydrophilicity more than 2 months. The as-made sponges are further applied to achieve stable laminar flow patterns, chemical gradients, and stop-flow manipulation of the flow in microfluidic devices. More importantly, the ease-of-operation and excellent pumping capacity have also been verified with over 24 h's pumping and quasi-stable high flow rates up to 15 mu L min(-1). The present strategy can be easily integrated to other miniaturized systems requiring pressure-driven flow and should have potential applications, such as cell culture, micromixing, and continuous flow reaction.
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