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We report the design of an autonomous sensing device, which employs a thermotropic nematic liquid crystal (LC) to conduct chemical or biological sensing tasks. The development of highly reproducible methods to create uniform LC thin film is critical for utilizing LCs for sensing. Herein, we describe the use of shear forces generated by the laminar flow of liquid within a microfluidic channel to create...
We present the design of a micropillar array that leads to the formation of stable and uniform liquid crystal (LC) thin films for sensing applications. Photolithography and electroplating methods were employed to fabricate the micropillar array. By using this microfabricated structure, thin films of LC (5CB: 4'-pentyl-4-cyanobiphenyl) were formed and stabilized against gravitational forces and mechanical...
We present principles for the design of a vapor-phase chemical sensor based on orientational transitions of nematic liquid crystals (LC) supported by a microfabricated pillar array structure. These principles are demonstrated by using the structure to detect vapor-phase Di-methyl methyl phosphonate (DMMP) via change in the intensity of light transmitted through the LC (5CB: 4-pentyl-4-cyanobiphenyl)...
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