Journal of the Korean Applied Science and Technology (한국응용과학기술학회지)

The Korean Society of Applied Science and Technology (한국응용과학기술학회)
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Effect of proton concentration in TEOS to improve durability of hydrophilic and high light transmittance properties of nanosilica coating

친수 및 높은 광투과 기능을 함유한 나노실리카 코팅액의 내구성 향상을 위한 수소이온 농도에 따른 TEOS의 반응 연구

  • Lee, Soo (Department of Chemical Engineering, Changwon National University) ;
  • Chan, Sung Il (Robust Components & System Research Center, KETI) ;
  • Hwang, Heon (Department of Bio-Mechatronics Engineering, Sungkyunkwan University)
  • 이수 (창원대학교 화공시스템공학과) ;
  • 천성일 (전자부품연구원 시스템 로버스트연구센터) ;
  • 황헌 (성균관대학교 생명공학부 바이오메카트로닉스전공)
  • Received : 2016.06.20
  • Accepted : 2016.09.20
  • Published : 2016.09.30
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Abstract

Even though the antifogging property of nanosilica coated glass surface is highly increased due to the hydrophilic hydroxyl groups on nanosilica surface, the durability of this property on outdoor glass was diminished rapidly after rain washing. In addition the topology of nanosilica coated glass surface plays very important roles to control an light transmittance or antireflection property. To improve these coating durability and characteristics a hydrophilic nanosilica coating on glass was prepared by coating with 1.5 wt% of nanosilica (Ludox) suspension in the presence of hydrolyzed tetraethylorthosilicate (TEOS). The optimum hydrolysis condition of TEOS in acidic or basic aqueous solution was also examined by contact angle measurement. The final transparent hydrophilic coating layer coated with nanosilica-TEOS in acidic condition (pH=4) showed much improved durability of hydrophilic surface as well as higher visible light transmittance than original uncoated glass by 2 % point.

나노실리카가 코팅된 유리 표면은 나노실리카 표면에 존재하는 친수성 수산기로 인해 방담성이 매우 증가하나, 실외에 설치된 유리에 코팅된 경우는 비에 의해 씻겨 나가 방담 특성의 내구성이 급격히 감소한다. 또한 나노실리카가 코팅된 유리 표면의 토폴로지는 광투과율 또는 반사방지 특성을 좌우하는 매우 중요한 인자이다. 이러한 나노실리카 코팅의 특성에 관한 내구성을 향상시키기 위하여 가교제로 테트라에틸오르소실리케이트 (TEOS)를 사용하여 나노실리카 (Ludox) 현탁액으로 친수성 나노실리카피막을 제조하였다. 산성 또는 염기성 수용액 중에서의 TEOS의 가수 분해 최적 조건도 물에 대한 접촉각 측정을 통하여 조사하였다. pH=4의 산성 조건에서 1.5 wt% 나노실리카-TEOS 코팅액으로 얻은 최종 투명한 친수성 코팅층은 매우 향상된 친수성에 대한 내구성뿐만 아니라, 코팅하지 않은 유리에 비해 약 2 % 포인트 정도 높은 가시광투과율을 나타내었다.

Keywords

References

  1. P. Kunze and K. Hausen, Nature, Inhomogeneous refractive index in the crystalline cone of a moth eye. 231, 392-3 (1971). https://doi.org/10.1038/231392a0
  2. A. R. Parker and H. E. Townley, Biomimetics of photonic nanostructures, Nat. Nanotechnol. 2, 347-353 (2007). https://doi.org/10.1038/nnano.2007.152
  3. H. K. Raut, V. A. Ganesh, A. S. Nair, and S. Ramakrish, Anti-reflective coatings: A critical, in-depth review, Energy Envir. Sci., 4(10), 3779-3804 (2011). https://doi.org/10.1039/c1ee01297e
  4. Solar & Energy Co., Ltd, "All about Energy and Secondary Battery (2010-2015)", (2011).
  5. G. McHale, N. J. Shirtcliffe, and M. I. Newton, Contact angle hysteresis super-hydrophobic surfaces, Langmuir, 2, 10146-10149 (2004).
  6. Y. -F. Huang, S. Chattopadhyay, Y. -J. Jen, C. -Y. Peng, T. -A. Liu, Y. -K. Hsu, C. -L. Pan, H.- C. Lo, C. -H. Hsu, Y.- H. Chang, C. -S. Lee, K. -H. Chen, and L. -C. Chen, Improved broadband and quasi-omnidirectional anti-reflection properties with biomimetic silicon nanostructures, Nat. Nanotechnol., 2(12), 770-774 (2007). https://doi.org/10.1038/nnano.2007.389
  7. Y. Wang, N. Lu, H. Xu, G. Shi, M. Xu, X. Lin, H. Li, W. Wang, D. Qi, Y. Lu, L. F. Chi, Biomimetic corrugated silicon nanocone arrays for self-cleaning antireflection coatings, Nano Res., 3, 520-527 (2010). https://doi.org/10.1007/s12274-010-0012-x
  8. N. .C. Linn, C. Sun, P. Jiang, Self-assembled biomimetic antireflection coatings, Appl. Phys. Lett., 91(10), 101108 (2007). https://doi.org/10.1063/1.2783475
  9. A. Tricoli, M. Righettoni, and S. E. Pratsinis, Anti-Fogging Nanofibrous $SiO_2$ and Nanostructured $SiO_2-TiO_2$, Langmuir, 25(21), 12578-12584 (2009). https://doi.org/10.1021/la901759p
  10. S. Permpoon, M. Houmard, D. Riassetto, L. Rapenne, G. Berthome, B. Baroux , J. C. Joud, and M. Langlet, Natural and persistent superhydrophilicity of $SiO_2-TiO_2$ and $TiO_2/SiO_2$ bi-layer films, Thin Solid Films, 516, 957-966 (2008). https://doi.org/10.1016/j.tsf.2007.06.005
  11. A. Eshaghi, A. A. Aghaei, H. Zabolian, M. Jannesari, and A. Firoozifar, Transparent superhydrophilic $SiO_2/TiO_2/SiO_2$ tri-layer nanostructured antifogging thin film, Ceramics - Silikaaty, 57(3), 210-214 (2013).
  12. X. M. Liu, and J. H. He, Hierarchically structured superhydrophilic coatings fabricated by self-assembling raspberry-like silica nanospheres, J. Colloid Interface Sci., 314(1), 341-345 (2007). https://doi.org/10.1016/j.jcis.2007.05.011
  13. C. K. Huang, K. W. Sun, and W. -L. Chang, Efficiency enhancement of silicon solar cells using a nano-scale honeycomb broadband antireflection structure, Optics Express, 20(S1), A85-A93 (2012). https://doi.org/10.1364/OE.20.000A85
  14. X. -T. Zhang, O. Sato, M. Taguchi, Y. Einaga, T. Murakami, A. Fujishima, Self-cleaning particle coating with antireflection properties, Chem. Mater., 17(3), 696-700 (2005). https://doi.org/10.1021/cm0484201
  15. W. Y. Gan, S. W. Lam, K. Chiang, R. Amal, H. J. Zhao, and M. P. Brungs, Novel $TiO_2$ thin film with non-UV activated superwetting and antifogging behaviours, J. Mater. Chem., 17, 952-954 (2007) https://doi.org/10.1039/b618280a
  16. L. Zhang, C.i Lu, Y. Li, Z. Lin, Z. Wang, H. Dong, T. Wang, X. Zhang, X. Li, J. Zhang, and B. Yang, Fabrication of biomimetic high performance antireflective and antifogging film by spin-coating, J. Colloid and Interface Sci., 374, 89-95 (2012). https://doi.org/10.1016/j.jcis.2012.01.051
  17. LG Hausys, Ltd., WO 2014073815 A1 (2014).
  18. S. Naviroj, S. Culler, J.L. Koenig, and H. Ishida, Structure and adsorption characteristics of silane coupling agents on silica and E-glass fiber; dependence on pH, J. Colloid and Interface Sci., 97, 308-317(1984) https://doi.org/10.1016/0021-9797(84)90301-1
  19. Y. Joung, W. S. Choi, Y. Shin, M. Lee, and H. Kim, Properties Characterization of the Hydrophilic Inorganic Film as Function of Coating Thickness, J. KIEEME, 26(6) 425-428 (2013).

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