Journal of the Microelectronics and Packaging Society (마이크로전자및패키징학회지)

The Korean Microelectronics and Packaging Society (한국마이크로전자및패키징학회)
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The Effect of Acetonitrile on the Texture Properties of Sodium Silicate Based Silica Aerogels

아세토니트릴 첨가가 물유리 기반 실리카 에어로겔의 기공구조에 미치는 영향

  • Kim, Younghun (Department of Materials Science and Engineering, Yonsei University) ;
  • Kim, Taehee (Department of Materials Science and Engineering, Yonsei University) ;
  • Shim, Jong Gil (GLChem Co., ltd.) ;
  • Park, Hyung-Ho (Department of Materials Science and Engineering, Yonsei University)
  • Received : 2018.12.12
  • Accepted : 2018.12.28
  • Published : 2018.12.31
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Abstract

Sodium silicate based silica aerogels are lower in cost than silica alkoxide based silica aerogels, but the demand is decreasing as their physical properties are lowered. In this research, acetonitrile as a drying control chemical additive (DCCA) is added in the sol state to improve the pore-structural properties of sodium silicate based silica aerogel by preventing the agglomeration of particles and cross-linked bond. The sodium silicate based silica aerogel by ambient pressure drying were prepared by sol-gel process. Acetonitrile/$Na_2SiO_3$ molar ratio of 0, 0.05, 0.1, 0.15, and 0.2 was added to the sol state. The physical properties of the final product were analyzed using Fourier transform infrared, contact angle measurement, Brunauer-Emmett-Teller and Barrett-Joyner-Halenda measurements and field emission scanning electron microscopy. It was confirmed that the sample with adding 0.15 molar ratio of acetonitrile and sodium silicate showed a high specific surface area ($577m^2/g$), a high pore volume (3.29 cc/g), and a high porosity (93%) comparable to the pore-structural properties of silica alkoxide based silica aerogels.

물유리 기반 실리카 에어로겔은 실리카 알콕사이드 기반 실리카 에어로겔에 비해 단가가 싸지만 기공률 및 비표면적과 같은 기공 특성이 상대적으로 열악하여 수요가 감소되고 있다. 이를 해결하기 위해 본 연구에서는 졸 상태에서 건조 제어 화학 첨가제(drying control chemical additive)인 아세토니트릴(acetonitrile)을 첨가하여 물성을 향상시키고자 하였다. 상압 건조 물유리 기반 실리카 에어로겔은 졸-겔 공정을 통해 제조되었으며, 졸 상태에서 물유리와 0, 0.05, 0.1, 0.15, 0.2의 몰 비율로 아세토니트릴을 첨가하여 실험을 수행하였다. 최종 생성물의 물성은 퓨리에 분광기(Fourier transform infrared), 접촉각측정기(contact angle measurement), Brunauer-Emmett-Teller 및 Barrett-Joyner-Halenda 분석기와 전계방사형 주사전자현미경(field emission scanning electron microscopy)를 이용하여 분석하였다. 졸 상태에서 물유리와의 몰 비율이 0.15인 아세토니트릴을 첨가한 샘플의 경우, 높은 비표면적 ($577m^2/g$), 높은 기공 부피 (3.29 cc/g), 높은 기공률 (93%)을 보유하여 실리카 알콕사이드 기반 실리카 에어로겔과 유사한 기공구조를 나타낼 수 있음을 확인하였다.

Keywords

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Fig. 1. FT-IR spectra of sodium silicate based silica aerogels: M0 (acetonitrile/Na2SiO3 = 0), M1 (acetonitrile/Na2SiO3 = 0.05), M2 (acetonitrile/Na2SiO3 = 0.1), M3 (acetonitrile/Na2SiO3 = 0.15), M4 (acetonitrile/Na2SiO3 = 0.2).

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Fig. 2. Contact angle measurement of sodium silicate based silica aerogels: M0 (acetonitrile/Na2SiO3 = 0), M1 (acetonitrile/ Na2SiO3 = 0.05), M2 (acetonitrile/Na2SiO3 = 0.1), M3 (acetonitrile/Na2SiO3 = 0.15), M4 (acetonitrile/Na2SiO3 = 0.2).

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Fig. 3. Pore size distributions of samples prepared by adding a various quantity of acetonitrile: M0 (acetonitrile/Na2SiO3 = 0), M1 (acetonitrile/Na2SiO3 = 0.05), M2 (acetonitrile/Na2SiO3 = 0.1), M3 (acetonitrile/Na2SiO3 = 0.15), M4 (acetonitrile/Na2SiO3 = 0.2).

MOKRBW_2018_v25n4_143_f0004.png 이미지

Fig. 4. N2 absorption-desorption isotherms of samples prepared by adding a various quantity of acetonitrile: M0 (acetonitrile/Na2SiO3 = 0), M1 (acetonitrile/Na2SiO3 = 0.05), M2 (acetonitrile/Na2SiO3 = 0.1), M3 (acetonitrile/Na2SiO3 = 0.15), M4 acetonitrile/Na2SiO3 = 0.2).

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Fig. 5. SEM images of samples prepared by adding a various quantity of acetonitrile: M0 (acetonitrile/Na2SiO3 = 0), M1 (acetonitrile/Na2SiO3 = 0.05), M2 (acetonitrile/Na2SiO3 = 0.1), M3 (acetonitrile/Na2SiO3 = 0.15), M4 (acetonitrile/Na2SiO3 = 0.2).

Table 1. Pore-structural properties of different silica aerogels: M0 (acetonitrile/Na2SiO3 = 0), M1 (acetonitrile/Na2SiO3 = 0.05), M2 (acetonitrile/Na2SiO3 = 0.1), M3 (acetonitrile/Na2SiO3 = 0.15), M4 (acetonitrile/Na2SiO3 = 0.2).

MOKRBW_2018_v25n4_143_t0001.png 이미지

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