Highly Efficient, Flexible, and Recyclable Air Filters Using Polyimide Films with Patterned Thru-Holes Fabricated by Ion Milling by Sang-Jun Choi, Kyung ho Kim, Hyun jin Kim, Jun Soo Yoon, Mi jung Lee, Kyung-Suk Choi, Ung-Dae Sung, Won-Taek Park, Jeongjun Lee, Jihyun Jeon, Jaehyuk Im, Kyoung-Kook Kim, Soohaeng Cho

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