Patterning of superhydrophobic paper to control the mobility of micro-liter drops for two-dimensional lab-on-paper applications

被引:158
作者
Balu, Balamurali [1 ]
Berry, Adam D. [1 ]
Hess, Dennis W. [1 ]
Breedveld, Victor [1 ]
机构
[1] Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 USA
关键词
CONTACT-ANGLE HYSTERESIS; MICROFLUIDIC DEVICES; WENZEL; CASSIE; SURFACE; LIQUID; ASSAY; CELLULOSE; ADHESION; HEALTH;
D O I
10.1039/b909868b
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
Superhydrophobic paper substrates were patterned with high surface energy black ink using commercially available desktop printing technology. The shape and size of the ink islands were designed to control the adhesion forces on water drops in two directions, parallel (`drag-adhesion') and perpendicular (`extensional-adhesion') to the substrate. Experimental data on the adhesion forces shows good agreement with classical models for `drag' (Furmidge equation) and `extensional' adhesion (modified Dupre e equation). The tunability of the two adhesion forces was used to implement four basic unit operations for the manipulation of liquid drops on the paper substrates: storage, transfer, mixing and sampling. By combining these basic functionalities it is possible to design simple two-dimensional lab-on-paper (LOP) devices. In our 2D LOP prototype, liquid droplets adhere to the porous substrate, rather than absorbing into the paper; as a result, liquid droplets remain accessible for further quantitative testing and analysis, after performing simple qualitative on-chip testing. In addition, the use of commercially available desktop printers and word processing software to generate ink patterns enable end users to design LOP devices for specific applications.
引用
收藏
页码:3066 / 3075
页数:10
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