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SM01.12.05 : Real-Time Magnetically Actuated Polymeric Micro-Blinds for Transmittance Control

5:00 PM–7:00 PM Apr 5, 2018

PCC North, 300 Level, Exhibit Hall C-E

Description
Sungho Lee1 Cheol Woo Park1 Young Hun Jeong1 Moonkyu Kwak1

1, Kyungpook National University, Daegu, , Korea (the Republic of)

Numerous studies have been conducted on micro- and nanostructured surfaces because micro- and nanosized structures can present distinct properties which are not found at bare surface. Lotus leaf’s superhydrophobicity, strong adhesion of Gecko lizard’s foot, and moth eye’s antireflection surface are representative examples utilizing micro- and nanopatterns. Beyond simple functional surfaces, there are also micro-nanostructure-based surfaces that actively respond to stimuli. Some plants, such as pine cones, orchid tree seed pod, and wheat awn, can autonomously change their shape by bending, twisting, swelling, and shrinking their surface structures and tissue in response to external stimuli. Recently, inspired by self-shaping, actuating micro/nano structured surfaces have attracted significant attention due to their ability to allow tuning of surface properties and function when they are actuated. In general, actuating structures are manipulated thermally, chemically, and magnetically.
In this study, we fabricated polymer-based micro-line patterns added with iron powder by solvent casting and fabricated micro structures were actuated in real time by magnetic force. Solvent casting is a well-known, simple, and inexpensive method for fabricating actuating patterns. Here, the bending deflection of microstructures was predicted by the cantilevered beam deflection formula and it was also observed by microscope. We observed the bending deflection of the microline patterns added with iron powder under varying line length, period, and iron content in accordance with the magnetic force by implementing the bending test. Subsequently, we confirmed the transmittance controllability of fabricated surface via transmittance measurements during micro structure actuation like blinds. The fabricated micro blinds were flexible and could easily be attached and removed on smooth surfaces, such as glass. As an application, PLPI might be used in optical fields, such as in smart windows.

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