This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License(http://creativecommons.org/licenses/bync/3.0)which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.Journal of Sensor Science and Technology Vol. 22, No. 2 (2013) AbstractA superhydrophobic mesh is a unique structure that blocks water, while allowing gases, sound waves, and energy to pass through the holes in the mesh. This mesh is used in various devices, such as gas-and energy-permeable waterproof membranes for underwater sensors and electronic devices. However, it is difficult to fabricate micro-and nano-structures on three-dimensional surfaces, such as the cylindrical surface of a wire mesh. In this research, we successfully produced a superhydrophobic water-repellent mesh with a high contact angle (>150°) for nanofibrous structures. Conducting polymer (CP) composite nanofibers were evenly coated on a stainless steel mesh surface, to create a superhydrophobic mesh with a pore size of 100 µm. The nanofiber structure could be controlled by the deposition time. As the deposition time increased, a high-density, hierarchical nanofiber structure was deposited on the mesh. The mesh surface was then coated with Teflon, to reduce the surface energy. The fabricated mesh had a static water contact angle of 163°, and a water-pressure resistance of 1.92 kPa.
Escherichia coli (E. coli) has been used extensively in various industrial and scientific applications but has not been used widely for microfluidic applications because it is difficult to immobilize properly to a device. Here, we describe the development of an E. coli immobilization method for microfluidic devices using single-walled nanotubes (SWNTs) and dielectrophoresis (DEP) force. SWNTs and E. coli were aligned between two cantilever electrodes by a positive DEP force, forming a film of SWNTs with attached E. coli. For a microfluidic device, our one-step immobilization method has many advantages such as site-specific immobilization, easy density and shape control, an electrically connected structure from the electrodes to the E. coli, and rapid processing.
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