期刊
MACROMOLECULAR RAPID COMMUNICATIONS
卷 29, 期 16, 页码 1363-1367出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.200800229
关键词
microfluidics; osmotic pressure; phase diagram; polysiloxanes; water-soluble polymers
资金
- Chinese University of Hong Kong
- Research Grants Council of Hong Kong [404406]
This paper describes a poly(dimethylsiloxane) (PDMS)-based microfluidic platform for constructing the phase diagram of poly (N-isopropyl acrylamide) (PNIPAM) in aqueous solution. The PNIPAM solution was delivered into a nanoliter chamber through the main microchannel. An osmotic pressure difference was established between the chamber and the control microchannel by flowing a high-concentration salt solution in the control microchannel. Controlled evaporation of water resulted in increasing concentration of PNIPAM. A phase diagram of PNIPAM was built by measuring the cloud points at different concentrations, with a minimum point at approximate to 40 wt.-%. The microfluidic platform has the advantages of low sample consumption and rapid heat exchange rates, and allows studying viscous polymer solution.
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