ADVANCED FUNCTIONAL FIBERS

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Surface textured polymer fiber microfluidics

Surface textured polymer fibers for microfluidics

A. Yildirim, M. Yunusa, F. E. Ozturk, M. Kanik, M. Bayindir, Advanced Functional Materials, volume 24, page 4569 (2014).

This article introduces surface textured polymer fibers as a new platform for the fabrication of affordable microfluidic devices. Fibers are produced tens of meters‐long at a time and comprise 20 continuous and ordered channels (equilateral triangle grooves with side lengths as small as 30 micrometers) on their surfaces. Extreme anisotropic spreading behavior due to capillary action along the grooves of fibers is observed after surface modification with polydopamine (PDA). These flexible fibers can be fixed on any surface—independent of its material and shape—to form three‐dimensional arrays, which spontaneously spread liquid on predefined paths without the need for external pumps or actuators. Surface textured fibers offer high‐throughput fabrication of complex open microfluidic channel geometries, which is challenging to achieve using current photolithography‐based techniques.

Bio-inspired hierarchically structured polymer fibers for anisotropic non-wetting surfaces

M Yunusa, FE Ozturk, A Yildirim, U Tuvshindorj, M. Kanik, M Bayindir, RSC Advances, volume 7 (25), page 1553 (2017).

We demonstrate a rice leaf-like hierarchically textured polymer fiber array for anisotropic non-wetting surfaces. To provide superhydrophobicity in addition to the anisotropic behavior, fiber surfaces are spray coated with organically modified silica nanoparticles. The resulting micro/nano hierarchically structured fiber surfaces demonstrate anisotropic non-wetting properties. We designed various fiber architectures for droplet transportation, mixing, and guiding exploiting the scalability of the fiber texture during thermal drawing; optional nanoparticle surface modification; and inherent flexibility of the fibers.

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