The Effect of Acid Concentration on the Synthesis of Hydrophobic Silica Based Aerogels

Yıl 2015, Cilt: 11 Sayı: 3, 0 - , 23.12.2015

Müge Yılmaz Özgül Özdemir Nevin Mermer Mehmet Pişkin

Öz

Aerogel has a meaning of an air gel that made of a gel solution [1]. Aerogels are transparent and highly porous materials which known with low density. Since the 1930’s, researchers have been focused on the synthesis methods and applications of aerogels [2]. In recent years, silica aerogels have been widely used in optics, microelectronic, electrical engineering, acoustics, heat insulation, capture of micro particles, pharmaceutical, chemistry, and biology [1-3].

In this study, the effect of the acid concentration on the synthesis of hydrophobic silica based aerogel was investigated. Tetraethyl orthosilicate (TEOS) and chlorotrimethylsilane (TMCS) were used in the synthesis as a silica source and silylation reagent, respectively. Different concentrations (0.5 M, 1 M, and 1.5 M) of acid solutions were prepared in order to see the effect of acid concentration in the synthesis of silica based hydrophobic aerogel. The synthesized samples were characterized by Fourier transform infrared spectroscopy (FTIR) and contact angle analysis. The obtained results show that the optimum acid concentration was found as 0.5 M.

Anahtar Kelimeler

component; Silica based aerogel, acid concentration, FT-IR, contact angle.

Kaynakça

• N. K. Mermer, M.S. Yılmaz, Ö. D. Özdemir, M. B. Pişkin, “Effect Of Ph And Aging Temperature On The Synthesis Of Silica Based Aerogel”, I. International Bioengineering Conference, 2015, 161- 164.
• J. Fricke, T. Tillotson, Thin Solid Films, 1997. 297, 212-223.
• Y. K. Akimov, “Instruments and Experimental Techniques”, 2003, 46(3), 287-299.
• M. Schmidt, F. Schwertfeger, “Applications for silica aerogel products”, 1998, Journal of Non-Crystalline Solids.
• P.M. Norris, “Aerogel: A Nanostructured Material with Fascinating Properties and Unlimited Applications”, Univers ity of Virginia.
• S. Ertürk, N. Karamahmut, M.S. Yılmaz, M.B. Pişkin, “Kurutma Koşullarının Aerojel Üretimine Etkisi”, Ulusal Kimya Mühendisliği Kongresi, 2014, Eskişehir.
• "Metal Oxide Aerogels". Aerogel.org. Retrieved , 2013, 06-12.
• "What is Aerogel? Theory, Properties and Applications". http://www.azom.com/. December 5, 2014.
• Microstructured Materials Group, “Silica Aerogels”, 2004. http://energy.lbl.gov/ecs/aerogels/sa-physical.html
• L.W. Hrubesh, “Aerogel Applications”, Journal of Non-Crystalline Solids, (1998), 225/335–342.
• I. Adachi, T. Sumiyoshi, K. Hayashi, N. Iida, R. Enomoto, K. Tsukada, R. Suda, S. Matsumoto, K. Natori, M. Yokoyama, H. Yokogawa, Nucl. Instr. Meth. Phys. Res., 1995, A 355, 390.
• Spoon, Marianne English (25 February 2014). "‘Greener’ aerogel technology holds potential for oil and chemical clean-up". University of Wisconsin Madison News. Retrieved 29 April 2015.
• Preventing heat escape through insulation called "aerogel", NASA CPL.
• L. J. Gurav,I.Jung, H. H. Park, E. S. Kang, D. Y. Nadargi, “Down-to-Earth Uses for Space Materials”, Sep 16 2014.
• I. Smirnova, S. Suttiruengwong, W. Arlt, "Feasibility study of hydrophilic and hydrophobic silica aerogels as drug delivery systems". Journal of Non-Crystalline Solids, 2004, 350: 54–60.
• M.A. Aegerter, N. Leventis, M.M. Koebel, “Aerogels Handbook” Springer Science+Business Media, 2011, 57-73.
• C.E. Kim, J.S. Yoon, H.J. Hwang, “Synthesis of Nanoporous Silica Aerogel by Ambient Pressure Drying”, Journal of Sol-Gel Science Technology, 2009, 47-52.
• J. Carmeliet, H. Hens, G. Vermeir, Research in Building Physics: Proceedings of the Second International Conference on Building Physics, Leuven, Belgium, 14-18 September 2003, 292.