Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Improvement in Mechanical Strength of α-Alumina Hollow Fiber Membrane by Introducing Nanosize γ-Alumina Particle as Sintering Agent

소결조제로 나노크기 γ-알루미나 입자의 도입에 따른 α-알루미나 중공사 분리막의 기계적 강도 향상

  • Kim, Yong-Bin (Graduate School of Energy Science and Technology, Chungnam National University) ;
  • Kim, Min-Zy (Graduate School of Energy Science and Technology, Chungnam National University) ;
  • Arepalli, Devipriyanka (Graduate School of Energy Science and Technology, Chungnam National University) ;
  • Cho, Churl-Hee (Graduate School of Energy Science and Technology, Chungnam National University)
  • 김용빈 (충남대학교 에너지과학기술대학원 에너지과학기술학과) ;
  • 김민지 (충남대학교 에너지과학기술대학원 에너지과학기술학과) ;
  • 아레팔리 데비프리얀카 (충남대학교 에너지과학기술대학원 에너지과학기술학과) ;
  • 조철희 (충남대학교 에너지과학기술대학원 에너지과학기술학과)
  • Received : 2022.04.22
  • Accepted : 2022.04.27
  • Published : 2022.04.30
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Abstract

In the field of water treatment and pharmaceutical bio an alumina hollow fiber membrane used for mixture separation. However, due to the lack of strengths it is very brittle to handle and apply. Therefore, it is necessary to study and improve the bending strength of the membrane to 100 MPa or more. In this study, as the mixing ratio of the nano-particles increased to 0, 1, 3, and 5 wt%, the viscosity of the fluid mixture increased. The pore structure of the hollow membrane produced by interrupting the diffusion exchange rate of the solvent and non-solvent during the spinning process suppresses the formation of the finger-like structure and gradually increases the ratio of the sponge-like structure to improve the membrane mechanical strength to more than 100 MPa. As a result, an interparticle space was ensured to improve the porosity of the sponge-like structure with high permeability, and it showed excellent N2 permeability of about 100000 GPU and high water permeability of 3000 L/m2 h. Therefore, it can be concluded, that the addition of γ-Al2O3 nanoparticles as sintering aid is an important method to enhance the mechanical strength of the α-alumina hollow fiber membrane to maintain high permeability.

수처리 및 의약바이오 분야에서 유효물질 분리에 활용되고 있는 알루미나 중공사 분리막은 얇은 두께로 인해 취급 및 적용시 쉽게 파괴되는 단점이 있기 때문에 분리막의 강도를 100 MPa 이상으로 향상시키기 위한 연구가 필요하다. 본 연구에서는 나노입자의 함량을 0, 1, 3, 5 wt%로 증가시켰을 때 제조된 중공사 분리막의 특성을 평가하였다. 그 결과, 나노입자의 함량이 증가함에 따라 중공사 분리막의 강도는 79 MPa에서 115 MPa로 증가하였으며, 밀도는 1.76 g/m3에서 1.88 g/m3으로 증가하였고 기공률과 평균기공크기는 각각 51%에서 48%로, 416 nm에서 352 nm로 감소한 것을 확인하였다. 스폰지구조가 발달하고 스폰지구조의 기공크기가 향상된 알루미나 중공사 분리막은 100 MPa 이상으로 기계적 강도가 향상되었으며, 약 100000 GPU의 높은 질소 투과도 및 약 3000 L/m2h의 높은 물 투과도를 나타내었다. 따라서, γ-알루미나 나노입자를 소결조제로 첨가하는 것은 α-알루미나 중공사 분리막의 기계적 강도를 효과적으로 증진시키고 높은 투과성능을 유지할 수 있는 매우 유효한 방법임을 확인하였다.

Keywords

Acknowledgement

본 연구는 과학기술정보통신부의 재원으로 한국연구재단 중견연구자사업의 지원을 받아 수행되었습니다 (NRF-2020R1A2C1013911).

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