A paper-based microfluidic device with cotton thread channels based on surface acoustic wave

ABSTRACT

A new paper-based microfluidic device is fabricated on a piezoelectric substrate. A polydimethylsiloxane channel filled with cotton threads is mounted on the piezoelectric substrate with an interdigital transducer. A testing filter paper with dried reaction solution is coated on the end of the cotton thread. Sample solution is driven to the cotton thread channel and transported to testing area for microfluidic analysis. Red ink solution and color development reaction of starch are demonstrated for microfluidic operation and analysis. Results show that the linear velocity of microfluidic transportation in the cotton thread channel is 4.558 mm/s, and color development reaction of starch is successfully implemented.

KEYWORDS:

• Color development reaction
• interdigital transducer
• microchannel
• paper-based microfluidic device
• surface acoustic wave

Funding

This work was partly supported by the Research fund of Changzhou Institute of Technology and Innovation fund under award Number YN1404, J2016045 and 201511055039X.