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The Membrane Society of Korea (한국막학회)
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Fabrication and Ionic Current Rectification Characteristics of Biomimetic Aluminum Oxide Membrane

생체모방형 비대칭 나노채널을 갖는 산화알루미늄 분리막 제조 및 이온 정류 특성

  • Jung, Jaehoon (Graduate School of Energy Science and Technology (GEST), Chungnam National University) ;
  • Kim, Jongyoung (NextE&M Research Institute, Environmental Research Center) ;
  • Choi, Kiwoon (NextE&M Research Institute, Environmental Research Center) ;
  • Lee, Joonho (NextE&M Research Institute, Environmental Research Center) ;
  • Kang, Il-suk (National Nanofab Center, Korea Advanced Institute of Science and Technology) ;
  • Ahn, Chi-won (National Nanofab Center, Korea Advanced Institute of Science and Technology) ;
  • Cho, Churl-Hee (Graduate School of Energy Science and Technology (GEST), Chungnam National University)
  • 정재훈 (충남대학교 에너지과학기술대학원 에너지과학기술학과) ;
  • 김종영 ((주) 넥스트이앤엠) ;
  • 최기운 ((주) 넥스트이앤엠) ;
  • 이준호 ((주) 넥스트이앤엠) ;
  • 강일석 (나노종합기술원) ;
  • 안치원 (나노종합기술원) ;
  • 조철희 (충남대학교 에너지과학기술대학원 에너지과학기술학과)
  • Received : 2020.05.04
  • Accepted : 2020.05.06
  • Published : 2020.06.30
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Abstract

In the present study, a biomimetic alumina membrane was fabricated by using selenic acid as an electrolyte to overcome the asymmetry limit of the square pulse anodization process. The prepared membrane has conical channels with a minimum diameter of 10 nm, a maximum diameter of 50 nm, and a length of 5 ㎛. The rectification property was higher than membranes fabricated by sulfuric acid. It showed 2.9 times larger current at +1 V than -1 V. Also, the membrane, which sulfonic acid group was introduced by surface modification, showed 4.2 times larger rectification property at -1 V than +1 V. Theoretical verifications were supported by the numerical analyses of 2D models. The results of the present study present a convenient method to fabricate two type membranes with different rectification properties and are expected to be used to control ion transport.

본 연구에서는 생체모방형 비대칭 분리막 제조방법인 사각펄스양극산화법의 비대칭성 한계를 극복하기 위해 최근 보고된 셀렌산 전해액을 이용하고 표면개질에 따른 정류특성을 평가하였다. 분리막의 비대칭 원뿔형 채널은 최소직경이 10 nm이고 최대직경이 50 nm이며 길이가 5 ㎛이었다. 분리막의 정류특성은 기존 황산 전해액에서 제작된 것보다 높았으며 +1V에서의 전류가 -1 V일 때보다 최대 2.9배를 나타내었다. 또한, 실란화 반응을 이용한 표면개질을 통해 술폰산기를 도입한 분리막은 반대로 -1 V에서의 전류가 +1 V일 때보다 전류의 최대 4.2배인 정류특성을 나타냈다. 실험에 대한 이론적 증명은 2D 모델에 수치해석 결과를 제시함으로써 뒷받침되었다. 본 연구의 결과는 서로 다른 정류방향을 갖는 두 종류의 이온 정류 분리막을 손쉽게 제작할 수 있는 방법을 제시하며 이온의 이동을 제어하기 위한 다양한 연구 분야에 활용될 수 있을 것으로 기대된다.

Keywords

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