本研究利用溶膠凝膠法製備1H,1H,2H,2H-全氟辛基三乙氧基矽烷(triethoxy-1H,1H,2H,2H-tridecafluoro-n-octylsilane, FAS)改質四乙氧基矽烷(tetraethyl orthosilicate : TEOS)之無機/有機疏水性薄膜。其中矽烷、乙醇和水在酸、鹼性環境下進行水解反應後與1H,1H,2H,2H-全氟辛基三乙氧基矽烷(triethoxy-1H,1H,2H,2H-tridecafluoro-n-octylsilane)反應，利用氟-碳修飾二氧化矽奈米顆粒並以磁石攪拌器均勻反應形成凝膠，之後將凝膠以旋轉塗佈法(spin-coating)塗佈於玻璃基材上獲得一超疏水性薄膜。在添加氨水之鹼性環境下形成的薄膜帶有較大之顆粒，因此表面會變白，但其在玻璃上之水滴接觸角相較於中性與酸性環境下形成之薄膜高，其水滴接觸角高達151.65∘，二碘甲烷接觸角高達133.55∘而甘油接觸角高達155.51∘，在中性環境下水滴接觸角相較於鹼性要低一些，約為111.23∘，二碘甲烷接觸角為105.11∘，甘油接觸角為113.55∘，最後在添加鹽酸之環境下形成的薄膜幾乎接近於透明，但其水滴接觸角相較於鹼性與中性環境下之薄膜要來得低，水滴接觸角為109.83∘，二碘甲烷接觸角為92.32∘而甘油接觸角為113.24∘，在CCI與SEM的檢驗中，可以觀察不同酸鹼性的薄膜擁有不同的粗糙度，在FTIR的分析中，可以發現不僅只有物理結構的改變，也可以發現化學鍵結的變化，導致本實驗之薄膜有良好之疏水效果。
在實驗最後將不同酸鹼性的薄膜分別塗在磚頭、濾紙、A4紙上、玻璃，在這些材料上可以發現酸性藥劑在磚頭與玻璃上都能擁有良好之效果，而中性藥劑除了在上述材料中擁有良好效果以外，還發現其可以塗在鎂合金上以提升其抗腐蝕性，鹼性藥劑於上述材料中都能擁有良好之效果。

This paper describes a simple sol-gel technology to produce triethoxy-1H, 1H, 2H, 2H-tridecafluoro-n-octylsilane (FAS) modified tetraethoxysilane (TEOS) for fabricating both highly hydrophobic and oleophobic surface by coating thin fluoro-containing films. Desired surface roughness was obtained by tuning the microstructures of the sol–gels through precise control of hydrolysis, and condensation reactions of different pH solutions during sol–gel processing. The modification of surface chemistry was done by introducing a monolayer through surface condensation reaction. Changing the solution pH from acidic to alkaline, it becomes possible to form a superhydrophobic thin film on material surface. As NH4OH basic solution was used, the superhydrophobic film (>155°) was obtained, while a transparent thin film was produced by HCl acidic solution. The film formed in the neutral environment shows better corrosion resistance on AZ91D. The potential dynamic polarization tests and electrochemical impedance spectroscopy (EIS) measurement shows that neutral thin film coated on AZ91D alloys have more positive corrosion potential and lower corrosion current density than AZ91D substrates, indicating the corrosion resistance of AZ91D can be improved by depositing neutral thin film on its surface. A significant attention is paid to state of the anti-corrosion performance of superhydrophobic coatings. The microstructures of hydrophobic films were characterized by Scanning Electron Microscopy (SEM), which showed that nano-sized roughness increased by changing the solution pH from acidic to alkaline. Bonding force between the silica nanoparticles and FAS regent was analyzed by Fourier Transform Infrared (FT-IR) spectroscopy showed the presence of C-F and Si-O-Si bonds. Finally, we also evidently demonstrated superhydrophobic coatings on bricks, filter papers, A4 papers, and glasses.

[1] Z. Burton, B. Bhushan,” Surface characterization and adhesion and friction properties of hydrophobic leaf surfaces,” Ultramicroscopy vol. 106, pp. 709-719, 2012.
[2] A. Poynor, L. Hong, I. K. Robinson, S. Granick, Z. Zhang, P. A. Fenter,” How water meets a hydrophobic surface,” Physical Review Letters vol. 97, pp. 266101 1-4, 2006.
[3] T. Onda, S. Shibuichi, N. Satoh, K. Tsujii,” Super-water-repellent fractal surfaces,” Langmuir vol. 12, pp. 9, 1996
[4] J. Bico, C. Marzolin, D. Quere,” Pearl drops,” Europhysics letters vol. 47, pp220-226, 1999.
[5] W. Chen, A. Y. Fadeev, M. C. Hsieh, D. Oner, J. Yoingblood, T. J. McCarthy,” Ultrahydrophobic and ultralyophobic surfaces: some comments and examples,” Langmuir vol. 15, pp. 3395-3399, 1999.
[6] Z. Yoshimitsu, A. Nakajima, T. Watanabe, K. Hashimoto,” Effects of surface structure on the hydrophobicity and sliding behavior of water droplets,” Langmuir vol. 18, pp. 5818-5822, 2002..
[7] J. Kijlstra, K. Reihs, A. Klamt,” Roughness and topology of ultra-hydrophobic surfaces,” Colloids and surfaces A: physicochemical and engineering aspects vol. 206, pp. 521-529, 2002
[8] N. A. Patankar,” Mimicking the lotus effect: influence of double roughness structures and slender pillars,” Langmuir vol. 20, pp. 8209-8213, 2004.
[9] W. Barthlott, C. Neinhuis,” Purity of the sacred lotus, or escape from contamination in biological surfaces,” Planta vol. 202, pp. 1-8, 1997.
[10] http://www.mse.fcu.edu.tw/wSite/publicfile/Attachment/f1348051531886.pdf.
[11] http://wthielicke.gmxhome.de/bionik/indexuk.htm.
[12] N. J. Shirtcliffe, G. McHale, M. I. Newton,” The superhydrophobicity of polymer surface: recent developments,” Journal of Polymer Science Part B: Polymer Physics vol. 49, pp. 1203-1217, 2011.
[13] R. J. Good,” A thermodynamic derivation of Wenzel’s modification of Young’s equation for cantact angles；together with a theory of hysteresis,” Journal of the American Chemical Society vol. 74, pp. 5041-5042, 1952.
[14] R. N. Wenzel,” Resistance of solid surfaces to wetting by water,” Journal of Industrial and Engineering Chemistry vol. 28, pp. 988-994, 1936.
[15] A. B. D. Cassie, S. Baxter,” Wettability of porous surfaces,” Transactions of the Faraday Society vol. 40, pp. 546-551, 1944.
[16] A. B. D. Cassie,” Contact angles,” Discussions of the Faraday Society vol. 3, pp. 11-16, 1948.
[17] L. Feng, S. Li, Y. Li, H. Li, L. Zhang, J. Zhai, Y. Song, B. Liu, L. Jiang, D. Zhu,” Superhydrophobic surfaces : from natural to artificial,” Advanced Materials vol. 24, pp. 1857-1860, 2002.
[18] L. Cao, T. P. Price, M. Weiss, D. Gao,” Super water and oil repellent surface on intrinsically hydrophilic and oleophilic porous silicon films,” Langmuir vol. 24, pp. 1640-1643, 2008.
[19] J. Wang, F. Liu, H. Chen, D. Chen,” Superhydrophobic behavior achieved from hydrophilic surfaces,” Applied physics letters vol. 95, pp. 84104 1-3, 2009.
[20] L. L. Liu, X. O. Feng, G. Wang, S. W. Yu,” Mechanisms of superhydrophobicity on hydrophilic substrates,” Journal of physics: Condensed Matter vol. 19, pp. 356002 1-12, 2007.
[21] A. Marmur,” From hydrophilic to superhydrophobic: Theoretical conditions for
making high-contact-angle surfaces from ;ow-contact-angle materials,” Langmuir vol. 24, pp. 7573-7579, 2008.
[22] H. H. Liu, H. Y. Zhang, W. Li,” Thermodynamic analysis on wetting behavior of hierarchical structured superhydrophobic surfaces,” Langmuir vol. 27, pp. 6260-6267, 2011.
[23] C. W. Extrand,” Model for contact angles and hysteresis on rough and ultraphobic surfaces,” Langmuir vol. 18, pp. 7991-7999, 2002.
[24] A. Tutwja, W. Choi, M. Ma, J. M. Mabry, S. A. Mazzella, G. C. Rutledge, G. H. Mckinley, R. E. Cohen,” Designing Superolelphobic Surfaces,” Science vol. 318, pp. 1618-1622, 2007.
[25] M. Nosonnvsky, B. Bhushan,” Biologically inspired surfaces: broadening the scope of roughness,” Advanced Functional Materials vol. 18, pp. 843-855, 2008.
[26] D. Quere, M. Reyssat,” Non-adhesive lotus and other hydrophobic materials,” Philosophical Transactions of The Royal Society A vol. 366, pp. 1539-1556, 2008.
[27] K. Koch, B. Bhushan, W. Barthlott,” Diversity of structure, morphology and wetting of plant surfaces,” Soft Matter vol. 4, pp. 1943-1963, 2008.
[28] Z. Guo, W. Liu,” Biomimic from the superhydrophobic plant leaves in nature:
Binary structure and unitary structure,” Plant Science vol. 172, pp. 1103-1112, 2007.
[29] W. Barthlott, T. Schimmel, S. Wiersch, K. Koch, M. Brede, M. Barczewski, S. Walheim, A. Weis, A. Kaltenmaier, A. Leder, H. F. Bohn,” The salvinia paradox: superhydrophobic surfaces with hydrophilic pins for air retention under water,” Advanced Materials vol. 22, pp. 2325-328, 2010.
[30] K. Koch, W. Barthlott,” Superhydrophobic and superhydrophilic plant surfaces: an inspiration for biomimetic materials,” Philosophical Transactions of The Royal Society A vol. 367, pp. 1487-1509, 2009.
[31] X. Gao, X. Yan, X. Yao, L. Xu, K. Zhang, J. Zhang, B.Yang, L. Jiang,” The dry-style antifogging properties of mosquito compound eyes and artificial analogues prepared by soft lithography,” Advanced Materials vol. 19, pp. 2213-2217, 2007.
[32] W. Lee, M. K. Jin, W. C. Yoo, J. K. Lee,” Nanostructuring of a polymeric substrate with well-defined nanometer-scale topography and tailored surface wettability,” Langmuir vol. 20, pp. 7665-7669, 2004.
[33] Y. Zheng, X. Gao, L. Jiang,” Directional adhesion of superhydrophobic butterfly wings,” Soft Matter vol. 3, pp. 178-182, 2007.
[34] G. S. Watson, B. W Cribb, J. A. Watson,” How micro/nanoarchitecture facilitates
anti-wetting: an elegant hierarchical design on the termite wing,” ACS Nano vol. 4, pp. 129-136, 2010.
[35] R. P. Evershed, R. Berstan, F. Grew, M. S. Copley, A. J. H. Charmant, E. Barham, H. R. Mottram, G. Brown,” Water-repellent legs of water striders,” Nature vol. 432, pp. 36, 2004.
[36] D. L. Hu, J. W. M. Bush,” Meniscus-climbing insects,” Nature vol. 437, pp. 733-736, 2005.
[37] J. W. M. Bush, D. L. Hu, M. Prakash,” The integument of water-walking
arthropods: form and function,” Advances in Inset Physiology vol. 34, pp. 117-192, 2008.
[38] A. Balmert, H. F. Bohn, P. D. Kuru, W. Barthlott,” Dry under water: omparative morphology and functional aspects of air-retaining insect surfaces,” Journal of Morphology vol. 272, pp. 442-451, 2011.
[39] N. J. Shirtcliffe, G. McHale, M. I. Newton, C. C. Perry, F. B. Pyatt,” Plastron properties of a superhydrophobic surface,” Applied physics letters vol. 89, pp. 104106 1-2, 2006.
[40] X. Zhang, J. Zhao, Q. Zhu, N. Chen, M. Zhang, Q. Pan,” Bioinspired aquatic microrobot capable of walking on water surface like a water strider,” ACS Applied Materials and Interfaces vol. 3, pp.0630-2636, 2011.
[41] D. L. Herbertson, C. R. Evans, N. J. Shirtcliffe, G. McHale, M. I. Newton,” Electrowetting on superhydrophobic SU-8 patterned surfaces,” Sensors and Actuators A vol. 130-131, pp. 189-193, 2006.
[42] D. M. Spori, T. Drobek, S. Zurcher, N. D. Spencer,” Cassie-state wetting investigated by means of a hole-to-pillar density gradient,” Langmuir vol. 26, pp. 9465-9473, 2010.
[43] B. Bhushan, K. Koch, Y. C. Jung,” Fabrication and characterization of the hierarchical structure for superhydrophobicity and self-cleaning,” Ultramicroscopy vol. 109, pp. 1029-1034, 2009.
[44] J. Zhang, B. Yang,” Pattering colloidal crystals and nanostructure arrays
by soft lithography,” Advanced Functional Materials vol. 20, pp. 3411-3424, 2010.
[45] A. Kravchenko, A. Shevchenko, V. Ovchinnikov, A. Priimagi, M. Kaivola,” Optical Interference Lithography Using Azobenzene- Functionalized Polymers for Micro- and Nanopatterning of Silicon,” Advanced Materials vol. 23, pp. 4174-4177, 2011.
[46] A. Accardo, F. Gentile, F. Mecarini, F. D. Angelis, M. Burghammer, E. D. Fabrizio, C. Riekel,” In situ X-ray scattering studies of protein solution droplets drying
on micro- and nanopatterned superhydrophobic PMMA surfaces,” Langmuir vol. 26, pp. 15057-15064, 2010.
[47] S. G. Park, J. H. Moon, S. K. Lee, J. Shim, S. M. Yang,” Bioinspired holographically featured superhydrophobic and supersticky nanostructured materials,” Langmuir vol. 26, pp. 1468-1472, 2010.
[48] K. C. Park, H. J. Choi, C. H. Chang, R. E. Cohen, G. H. McKinley, G. Barbastathis,” Nanotextured silica surfaces with robust superhydrophobicity and omnidirectional broadband supertransmissivity,” ACS Nano vol. 6, pp. 3789-3799, 2012.
[49] S. M. Kang, I. You, W. K. Cho, H. K. Shon, T. G. Lee, I. S. Choi, J. M. Karp, H. Lee,” One-step modification of superhydrophobic surfaces by a mussel-
inspired polymer coating,” Angewandte Chemie International Edition vol. 49, pp. 9401-9404, 2010.
[50] M. Sun, C. Luo, L. Xu, H. Ji, Q. Ouyang, D. Yu, Y. Chen,” Artificial lotus leaf by nanocasting,” Langmuir vol. 21, pp. 8978-8981, 2005.
[51] M. Qu, G. Zhao, Q. Wang, X. Cao, J. Zhang,” Fabrication of superhydrophobic surfaces by a Pt nanowire array on Ti/Si substrates,” Nanotechnology vol. 19, pp. 055707 1-5, 2008.
[52] X. Sheng, J. Zhang,” Superhydrophobic behaviors of polymeric surfaces with aligned nanofibers,” Langmuir vol. 25, pp. 6916-6922, 2009.
[53] Z. Cheng, J. Gao, L. Jiang,” Tip geometry controls adhesive states of superhydrophobic surfaces,” Langmuir vol. 26, pp. 8233-8238, 2010.
[54] A. Greiner, J. H. Wendorff,” Electrospinning: a fascinating method for the
preparation of ultrathin fibers,” Angewandte Chemie International Edition vol. 46, pp. 5070-5703, 2007.
[55] B. Grignard, A. Vaillant, J. D. Coninck, M. Piens, A. M. Jonas, C. Detrembleur, C. Jerome.” Electrospinning of a functional perfluorinated block copolymer as a powerful route for imparting superhydrophobicity and corrosion resistance to aluminum substrates.” Langmuir vol. 27, pp. 335-342, 2011.
[56] U. Cengiz, M. Z. Avci, H. Y. Erbil, A. S. Sarac,” Superhydrophobic terpolymer nanofibers containing perfluoroethyl alkyl methacrylate by electrospinning,” Applied Surface Science vol. 258, pp. 5815-5821, 2012.
[57] M. K. Sarkar, K. Bal, F. He, J. Fan,” Design of an outstanding super-hydrophobic surface by electro-spinning,” Applied Surface Science vol. 257, pp. 7003-7009, 2011.
[58] H. Xiang, L. Zhang, Z. Wang, X. Yu, Y. Long, X. Zhang, N. Zhao, J. Xu,” Multifunctional polymethylsilsesquioxane (PMSQ) surfaces prepared by electrospinning at the sol–gel transition: Superhydrophobicity, excellent solvent resistance, thermal stability and enhanced sound absorption property,”
Journal of Colloid and Interface Science vol. 359, pp. 296-303, 2011.
[59] Y. C. Sheen, Y. C. Huang, C. S. Liao, H. Y. Chou, F. C. Chang,” New approach to fabricate an extremely super-amphiphobic surface based on fluorinated silica
Nanoparticles,” Journal of Polymer Science: Part B: Polymer Physics vol. 46, pp. 1984-1990, 2008.
[60] W. Ma, H. Wu, Y. Higaki, H. Otsuka, A. Takahara,” A ‘‘non-sticky’’ superhydrophobic surface prepared by self-assembly of fluoroalkyl phosphonic acid on a hierarchically micro/nanostructured alumina gel film,” Chemical Communications vol. 48, pp. 6824-6826, 2012.
[61] S. A. Mahadik, M. S. Kavale, S. K. Mukherjee, A. V. Rao,” Transparent superhydrophobic silica coatings on glass by sol–gel method,” Applied Surface Science vol. 257, pp. 333-339, 2010.
[62] R. V. Lakshmi, T. Bharathidasan, P. Bea, B. J. Basu,” Fabrication of superhydrophobic and oleophobic sol–gel nanocomposite coating,” Surface & Coatings Technology vol. 206, pp. 3888-3894, 2012.
[63] E. Y. Kim, T. Hwang, S. S. Kim,” Change in microstructure and surface properties of electrospray-synthesized silica layers,” Journal of Colloid and Interface Science vol. 364, pp. 561-565, 2011.
[64] Y. Fan, C. Li, Z. Chen, H. Chen,” Study on fabrication of the superhydrophobic sol–gel films based on copper wafer and its anti-corrosive properties,” Applied Surface Science vol. 258, pp. 6531-6536, 2012.
[65] K. C. Camargo, A. F. Michels, F. S. Rodembusch, F. Horowitz,” Multi-scale structured, superhydrophobic and wide-angle, antireflective coating in the near-infrared region,” Chemical Communications vol. 48, pp.4992-4994, 2012.
[66] M. S. Kavale, D. B. Mahadik, V. G. Parale, P. B. Wagh, S. C. Gupta, A. V. Rao, H. C. Barshilia,” Applied Surface Science vol. 258, pp. 158-162, 2011.
[67] L. Xu, J. He,” Fabrication of highly transparent superhydrophobic coatings from hollow silica nanoparticles,” Langmuir vol. 28, pp. 7512-7518, 2012.
[68] R. M. Jisr, H. H. Rmaile, J. B. Schlenoff,” Hydrophobic and ultrahydrophobic multilayer thin films from perfluorinated polyelectrolytes,” Angewandte Chemie vol.44, pp. 782-758, 2005.
[69] W. Sun, L. Shen, J. Wang, K. Fu, J. Ji,” Netlike knitting of polyelectrolyte multilayers on honeycomb-patterned substrate,” Langmuir vol. 26, pp. 14236-14240, 2010.
[70] Y. H. Kim, Y. M. Lee, J. Y. Lee, M. J. Ko, P. J. Yoo,” Hierarchical nanoflake surface driven by spontaneous wrinkling of polyelectrolyte/metal complexed films,” ACS Nano vol. 6, pp. 1082-1093, 2012.
[71] E. J. Lee, C. H. Jung, I. T. Hwang, K. H. Choi, S. O. Cho, Y. C. Nho,” Surface morphology control of polymer films by electron irradiation and its application to superhydrophobic surfaces,” ACS Applied Materials and Interfaces vol. 3, pp. 2988-2993, 2011.
[72] N. Vandencasteele, B. Broze, S. Collette, C. D. Vos, P. Viville, R. Lazzaroni, F. Reniers,” Evidence of the synergetic role of charged species and atomic oxygen in the molecular etching of PTFE surfaces for hydrophobic surface synthesis,” Langmuir vol. 26, pp. 16503-16509, 2010.
[73] E. Wohlfart, J. P. F. Blazquez, E. Arzt, A. D. Campo,” Nanofibrillar patterns on PET: The influence of plasma parameters in surface morphology,” Plasma Processes and Polymers vol. 8, pp. 876-884, 2011.
[74] K. Tsougeni, N. Vourdas, A. Tserepi, E. Gogolides,” Mechanisms of oxygen plasma nanotexturing of organic polymer surfaces: srom stable super hydrophilic to super hydrophobic surfaces,” Langmuir vol. 25, pp. 11748-11759, 2009.
[75] A. K. Gnanappa, D. P. Papageorgiou, E. Gogolides, A. Tserepi, A. G. Papathanasiou, A. G. Boudouvis,” Hierarchical, plasma nanotextured, robust
superamphiphobic polymeric surfaces structurally stabilized through a wetting–
drying cycle,” Plasma Processes and Polymers vol. 9, pp. 304-315, 2012.
[76] S. J. Hwang, D. J. Oh, P. G. Jung, S. M. Lee, J. S. Go, J. H. Kim, K. Y. Hwang, J. S. KO,” Dry etching of polydimethylsiloxane using microwave plasma,” Journal of Micromechanics and Microengineering vol. 19, pp. 095010 1-10, 2009.
[77] R. Wu, S. Liang, A. Pan, Z. Yuan, Y. Tang, X. Tan, D. Guan, Y. Yu,” Fabrication of nano-structured super-hydrophobic film on aluminum by controllable immersing method,” Applied Surface Science vol. 258, pp. 5933-5937, 2012.
[78] Y. Zhang, J. Wu, X. Yu, H. Wu,” Low-cost one-step fabrication of superhydrophobic surface on Al alloy,” Applied Surface Science vol. 257, pp. 7928-7931, 2011.
[79] J. P. Lee, S. Choi, S. Park,” Extremely superhydrophobic surfaces with micro- and nanostructures fabricated by copper catalytic etching,” Langmuir vol. 27, pp. 809-814, 2011.
[80] R. Su, H. Liu, T. Kong, Q. Song, N. Li, G. Jin, G. Cheng,” Tuning surface wettability of InxGa(1-x)N nanotip arrays by phosphonic acid modification and photoillumination,” Langmuir vol. 27, pp. 13220-13225, 2011.
[81] L. Yao, M. Zheng, S. He, L. Ma, M. Li, W. Shen,” Preparation and properties of ZnS superhydrophobic surface with hierarchical structure,” Applied Surface Science vol. 257, pp. 2955-2959, 2011.
[82] C. R. Crick, S. Ismail, J. Praaten, I. P. Parkin,” An investigation into bacterial attachment to an elastomeric superhydrophobic surface prepared via aerosol assisted deposition,” Thin Solid Films vol. 519, pp. 3722-3727, 2011.
[83] R. A. Wolf, Atomospheric Pressure Plasma for Surface Modification: John Wiley
& Sons, 2013.
[84] R. E. Belford and S. Sood, “Surface Activation Using Remote Plasma for Hydrophilic Bonding at Elevated Temperature,” Electrochemical and Solid-State Letters, vol. 10, pp. H145, 2007.
[85] K. Johnsen, S. Kirkhorn, K. Olafsen, K. Redford, and A. Stori, “Modification of polyolefin surfaces by plasma-induced grafting,” Journal of Applied Polymer Science, vol. 59, pp. 1651-1657, 1996.
[86] T. M. Tillotson, L. W. Hrubesh,” Transparent ultralow-density silica aerogels prepared by a two-step sol-gel process,” Journal of Non-Crystalline Solids vol. 145, pp. 44-50, 1992.
[87] C. H. Lin,” Preparation and property identification of nano-silica particles.” 第26屆 纖維紡織科技研討會, pp. 1113-1116.
[88] T.W. Zerda, I. Artaki, J. Jonas,” Study of polymerization processes in acid and base catalyzed silica sol-gels,” Journal of Non-Crystalline Solids vol. 81, pp. 365-379, 1986.
[89] 陳奇民,” 以溶膠凝膠法製備抗反射光學膜的研究,” 碩士, 應用化學系(所), 朝陽科技大學, 台中市, 2009.
[90] C.J. Brinker,” Hydrolysis and condensation of silicates: Effects on structure,” Journal of Non-Crystalline Solids vol. 100, pp. 31-50, 2003.
[91] I. Strawbridge, A. F. Craievich, P. F. James,” The effect of the H2O/TEOS ratio on the structure of gels derived by the acid catalysed hydrolysis of tetraethoxysilane,” Journal of Non-Crystalline Solids vo. 72, pp. 139-157, 1985.
[92] http://sindatek.com/Bmyl.htm.
[93] http://mypaper.pchome.com.tw/momoca/post/1324313883.