Abstract
The superwettable surface inspired by Namib Desert beetle and lichen have provided outstanding ability in controlling droplets and great potential for the development of functional surfaces. However, the expensive, time-consuming and complex fabrication process limits extensive application. In this work, a superwettable surface including polydimethylsiloxane (PDMS)-based superhydrophobic (SPO) area and paper-based superhydrophilic (SPI) sites is prepared by laser-etched without special chemical modification, which is simply, pattern controllable and environmentally friendly. On SPO area, the water contact angle (WCA) is 151.3° and water sliding angle (WSA) is 4°, but the WCA of SPI site is almost 0°. Therefore, droplets are repelled by SPO area and tightly locked in SPI sites without spilling. The surface with excellent stability and flexibility is extended to portable testing materials for droplet collection, arrays and colorimetric detection. The PDMS-paper based surface is proved feasibility in application of colorimetry, such as pH, nitrite, starch and protein. This work provides inspiration for simply manufacturing of flexible superwettable patterned surfaces and shows potential applications in sample collection and portable testing, which is of significance to the design of portable testing materials, development of small devices and application of intelligent detection.
Published Version
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