Rice Husk Ash as a Renewable Source for the Production of Value Added Silica Gel and its Application: An Overview

Ram Prasad, Monika Pandey

DOI: http://dx.doi.org/10.9767/bcrec.7.1.1216.1-25


In recent years, silica gels have developed a lot of interest due to their extraordinary properties and their existing and potential applications in science and technology. Silica gel has a wide range of applications such as a desiccant, as a preservation tool to control humidity, as an adsorbent, as a catalyst and as a cata-lyst support. Silica gel is a rigid three-dimensional network of colloidal silica, and is classified as: aqua-gel, alco-gel, xero-gel and aero-gel. Out of all known solid porous materials, aero-gels are particularly known for their high specific surface area, high porosity, low bulk density, high thermal insulation value, ultra low dielectric constant and low index of refraction. Because of these extraordinary properties silica aero-gel has many commercial applications such as thermal window insulation, acoustic barriers, super-capacitors and catalytic supports. However, monolithic silica aero-gel has been used extensively in high energy physics in Cherenkov radiation detectors and in shock wave studies at high pressures, inertial confinement fusion (ICF) radio-luminescent and micrometeorites. Silica gel can be prepared by using various sol gel precursors but the rice husk (RH) is considered as the cheapest source for silica gel production. Rice husk is a waste product abundantly available in rice producing countries during milling of rice. This review article aims at summarizing the developments carried out so far in synthesis, properties, characterization and method of determination of silica, silica gel, silica aero-gel and silica xero-gel. The effect of synthesis parameters such as pH, temperature of burning the rice husk, acid leaching prior to formation of rice husk ash (RHA) on the properties of final product are also described. The attention is also paid on the application of RH, RHA, sil-ica, silica aero-gel and silica xero-gel. Development of economically viable processes for getting rice husk silica with specific properties assumes importance at this juncture. Copyright © 2012 by BCREC UNDIP. All rights reserved.

Received: 23th November 2011, Revised: 09th January 2012, Accepted: 10th January 2012

[How to Cite: R. Prasad, and M. Pandey. (2012). Rice Husk Ash as a Renewable Source for the Production of Value Added Silica Gel and its Application: An Overview. Bulletin of Chemical Reaction Engineering & Catalysis, 7 (1): 1-25. doi:10.9767/bcrec.7.1.1216.1-25]

[How to Link / DOI: http://dx.doi.org/10.9767/bcrec.7.1.1216.1-25 ]


Rice husk; Rice husk ash; Sodium silicate; Silica gel; Review

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Jain, A. K.; Sharma, S. K.; and Singh, D. 1996. Reaction Kinetics of Paddy Husk Thermal Decomposition: Proceedings 31th Intersociety of Energy Conversion Engineeering Conference, 4: 2274-2279. Washington D.C. ASME. CrossRef

Yalcin, N.; and Sevinc, V. 2001. Studies on silica obtained from rice husk. Ceram. Inter. 27: 219-224. CrossRef

Pijarn, N.; Jaroenworaluck, A.; Sunsaneeyametha, W.; and Stevens, R. 2010. Synthesis and characterization of nanosized-silica gels formed under controlled conditions. Powder Technol. 203 (3): 462-468. CrossRef

Rao, V. M. H. G. 1980. Utilization of rice husk—A preliminary analysis. J. Sci. Ind. Res. 39: 495-515.

Sharma, N. K.; Williams, W. S.; and Zangvil, A. 1984. Formation and structure of silicon carbide whiskers from rice hulls. J. Am. Ceram. Soc. 67: 715-720. CrossRef

Patel, M.; Karera A.; and Prasanna, P. 1987. Effect of thermal and chemical treatments on carbon and silica contents in rice husk. J. Mater. Sci. 22: 2457-2464. CrossRef

Patel, M.; Karera, A.; 1991. SiC whisker from rice husk: Microscopic study. Powder Metall. Int. 23 (1): 30-32.

Ding, M. 1992. Rice husk silicon and its applications. Inorg. Chem. Ind. 24 (6): 36-42.

Krishnarao, R. V.; and Godkhindi, M. M.; 1992. Distribution of silica in rice husks and its effect on the formation of silicon carbide. Ceram. Int., 18: 243-249. CrossRef

Chandrasekhar, S.; Satyanarayana, K. G.; Pramada, P. N.; and Raghavan P. 2003. Review Processing, properties and applications of reactive silica from rice husk- an overview. J. Mat. Sci. 38: 3159 – 3168. CrossRef

Rao, R. V. Krishna; Godkhindi, Andm. M.; 1992. Effect of Si additions on the formation of SiC whiskers from rice husks. Ceram. Int. 18:185. CrossRef

Ismail, Muhammad Shoaib.; and Waliuddin, A. M. 1996. Effect of rice husk ash on high strength Concrete. Const. and Build. Mat. 10: 521-526. CrossRef

Proctor, A.; Clark, P.K.; and Parker, C.A. 1995. Rice hull ash adsorbent performance under commercial soy oil bleaching conditions. J. Am. Oil Chem. Soc. 72: 459-462. CrossRef

Proctor, A.; and Palaniappan, S. 1990. Adsorption of soy oil free fatty acids by rice hull ash. J. Am. Oil Chem. Soc. 67: 15-17. CrossRef

Sun, L.; and Gong, K.; 2001. Review, silicon-based materials from rice husks and their applications. Ind. Eng. Chem. Res. 40: 5861–5877. CrossRef

Krishna Rao, R. V.; Subrahmanyam, J.; and Kumar T. J. 2001. Studies on the formation of black particles in rice husk silica ash. J. Eur. Ceram. Soc. 21(1): 99-104. CrossRef

Tang, Qi.; and Wang Tao. 2005. Preparation of silica aero-gel from rice hull ash by supercritical carbon dioxide drying. J. Supercritical Fluids 35: 91–94. CrossRef

Bhattacharya S. C.; and Wu, W. 1989. Fluidized bed combustion of rice husk for disposal and energy recovery. Energy from Biomass & wastes 12: 591-601.

Boaterg, S. D. A. 1990. Incineration of rice hull for use as a cementitious material. Cem. Concr. Res. 20(5): 795-802. CrossRef

Huang, S.; Jing, S.; Wang, J.; Wang, Z.; and Jin, Y. 2001. Silica white obtained from rice husk in fluidized bed. Powder Tech. 117: 232–238. CrossRef

Mochidzuki, K.; Sakoda, A.; Suzuki, M.; Izumi, J.; and Tomonaga, N. 2001. Structural behavior of rice husk silica in pressurized hot-water treatment process. Indus. Eng. Chem. Res. 40: 5705 – 5709. CrossRef

Liou, T.-H. 2004. Evolution of chemistry and morphology during the carbonization and combustion of rice husk. Carbon 42: 785–794. CrossRef

Liou, T.-H. 2004. Preparation and characterization of nano-structured silica from rice husk. Mat. Sci. Eng. 364: 313–323. CrossRef

Kalapathy, U.; Proctor, A.; and Schultz, J. 2000a. A simple method for production of pure silica from rice hull ash. Biores. Tech. 73: 257–262. CrossRef

Shelke, V. R.; Bhagade, S. S.; and Mandavgane, S. A. 2010. Mesoporous Silica from Rice Husk Ash. Bull. Chem. React. Eng. Catal. 5(2): 63–67. CrossRef

Sidheswaran P.; and Bhat A. N. 1996. Recovery of amorphous silica in pure form from rice husk. Trans. Ind. Ceram. Soc. 55(4): 93-96.

Hamad, M. A.; and Khattab, I. A. 1981. Effect of the combustion process on the structure of rice hull silica, Thermochim. Acta 48: 343–349. CrossRef

Real, C.; Alcala, M. D.; and Criado, J. M. 1996. Preparation of silica from rice husks. J. Am. Ceram. Soc. 79(8): 2012-2016. CrossRef

Hanafi, S.; Abo-El-Enein, S. A.; Ibrahim, D. M.; and El-Hemaly, S. A. 1980. Thermochim. Acta 37: 137-143. CrossRef

Chakraverty, A.; Mishra, P.; and Banerjee, H. D. 1988. Investigation of combustion of raw and acid-leached rice husk for production of pure amorphous white silica. J. Mater. Sci. 23(1): 21-24. CrossRef

Liou, T.-H.; Yang, C.-C. 2011. Synthesis and surface characteristics of nanosilica produced from alkali-extracted rice husk ash. Mat. Sci. Eng. B 176: 521–529. CrossRef

Kamath, S. R.; Proctor, A. 2004. Silica gel from rice husk ash: preparation and characterization. Cer. Chem.75:484–487. CrossRef

Polska, K.; Radzki, S. 2008. Spectral and AFM characterization of trimethylammoniophenyl-porphyrin and concanavalin A associate in solution and monolithic SiO2 gels obtained by the sol–gel method. Opt. Mat. 30: 1644–1654. CrossRef

Estella, J.; Echeverría, J. C.; Laguna, M.; Garrido, J. J. 2007. Effects of aging and drying conditions on the structural and textural properties of silica gels. Micro. Meso. Mat. 102: 274– 282. CrossRef

Handy, B.; Walther, K. L.; Wokaun, A.; and Baiker, A. 1991. Influence of preparation parameters on pore structure of silica gels prepared from tetraethoxy orthosilicate. Stud. Sur. Sci. Cat. 63: 239–246. CrossRef

Monde, T.; Fukube, H.; Nemoto, F.; Yoko, T.; and Konakahara, T.1999. Preparation and surface properties of silica gel coating films containing branched-polyfluoroalkylsilane. J. Non-Crystalline Solids 246: 54-64. CrossRef

Kamath Savita R.; and Proctor Andrew ; 1998. Silica Gel from Rice Hull Ash: Preparation and Characterization. Cereal Chem. 75(4): 484-487. CrossRef

Nayak, J. P.; and Bera J. 2009. Preparation of Silica Aero-gel by ambient pressure drying process using rice husk ash as raw material. Trans. Ind. Ceram. Soc. 68(2): 1-4.

Einarsruda, Mari-Ann; Haereida, Siv; and Wittwerb Volker; 1993. Some thermal and optical properties of a new transparent silica xero-gel material with low density, Solar Ener. Mat. Solar Cel. 31(3): 341-347. CrossRef

Affandi, Samsudin; Setyawan, Heru; Winardi, Sugeng ; Purwanto, Agus ; and Balgis, Ratna; 2009. A facile method for production of high-purity silica xero-gels from bagasse ash. Advan. Powd. Technol. 20: 468–472. CrossRef

Hong, Jung-Kyun; Yang, Hee-Sun; Moon-Ho Jo, Park Hyung-Ho; and Choi Se-Young; 1997. Preparation and characterization of porous silica xero-gel film for low dielectric application. Thin Solid Films 308: 495–500. CrossRef

Chakraverty, A.; Kaleemullah, S. 1991. Conversion of rice husk into amorphous silica and combustible gas. Energy Convers. Manage. 32: 565-570. CrossRef

Luan, T. C.; Chou, T. C. 1990. Recovery of silica from the gasification of rice husk/coal in the presence of a pilot flame in a modified fluidized bed. Ind. Eng. Chem. Res. 29: 1922–1927. CrossRef

Iler, R. K. 1979. Silica gels and powders. The Chem. of Silica R. K. Iler. (Ed.) 462-599.

Kalapathy U.; Proctor A.; Shultz J. 2002. An improved method for production of silica from rice hull ash. Biores. Tech. 85: 285–289. CrossRef

Hrubesh, L. W. 1990. Aero-gels: the world’s lightest Solids. Chem. Indus. 24: 824–827.

Fricke, J.; and Emmerling, A. 1992. Aero-gels, preparation, properties, applications, in Structure and Bonding. Springer Ser. Structure Bonding 77: 37–87. CrossRef

Gurav, J. L.; Jung, I.-K.; Park, H.-H.; Kang E. S. and Nadargi, D. Y. 2010. Silica Aero- gel: Synthesis and Application. J. Nano Mat. 1—11. CrossRef

Dorcheh A. Soleimani.; Abbasi M. H. 2008. Silica Aero-gel; Synthesis, Properties and Characterization. J. Mat. Proc. Tech. 199: 10–26. CrossRef

Schwertfeger, F.; Frank D.; and Schmidt, M. 1998. Aero-gel-High Tenuous Solids with Fascinating Properties. J. Non-Cryst. Solids 225: 24-29. CrossRef

Robert R. Keller, Sr. 2009. Aero-gel and method of manufacturing same. US Patent 7618608.

Lee, C. J.; Kim, G. S.; and Hyun, S.H. 2002. Synthesis of silica aero-gels from waterglass via new modified ambient drying. J. Mater. Sci. 37: 2237–2241. CrossRef

Rao, A. P.; Pajonk, G.M.; and Rao, A.V. 2005. Effect of preparation conditions on the physical and hydrophobic properties of two step processed ambient pressure dried silica aerogels. J. Mater. Sci. 40: 3481–3489. CrossRef

Husing, N.; and Schubert, U. 1998. Aero-gels-Airy materials: Chemistry, structure, and properties. Angew. Chem. Int. Ed. 37: 22-45. CrossRef

Rousset, J. L.; Boukenter, A.; Champagnon B. 1990. Granular structure and fractal domains of silica aero-gels J. Phy: Conden. Mat., 2(42): 8445–8455. CrossRef

Liu, C.; Komarneni, S.; Smith, D. M.; Beck, J.S. (Eds.) 1995. Advances in Porous Materials. Mater. Res. Soc. Symp. Proc. 371: 217-222.

Komarneni, S.; Roy, R.; Selvaraj, U.; Malla, P. B.; and Breval, E. 1993. Biocompatibility of polymeric delivery systems for macromolecules. J. Mater. Res. 8: 3163- 3167. CrossRef

Attia, Y.A.; Ahmed, M.S.; Zhu, M.; Attia, Y.A. (Ed.). 1994. Sol–Gel Processing and Applications. J. Sol-Gel Sci. Technol. 311-315.

Shi, F.; Wang, L.; and Liu, J. 2006. Synthesis and characterization of silica aero-gels by a novel fast ambient pressure drying process. Mater. Lett. 60: 3718–3722. CrossRef

Wagh, P.B.; Begag, R.; Pajonk, G.M.; Rao, A.V.; Haranath, D. 1999. Comparison of some physical properties of silica aero-gel monoliths synthesized by different precursors. Mater. Chem. Phys. 57: 214–218. CrossRef

Kim, G. S.; Hyun, S. H. 2004. Synthesis and characterization of silica aero-gel films for inter- metal dielectrics via ambient drying. Thin Solid Films 460: 190–200. CrossRef

Drake, J. M.; Yacullo, L. N.; Levitz, P.; and Klafter, J. 1994. Nitrogen Adsorption on Porous Silica: Model-Dependent Analysis. J. Phys. Chem. 98: 380-382. CrossRef

Reichenauer, G.; and Scherer, G.W. 2001. Nitrogen sorption in aero-gels. Adsorption isotherms –hysteresis. J. Non-Cryst. Solids 285: 167-174. CrossRef

Moner-Girona, M.; Roig, A.; and Molins, E. 2003. Sol gel route to direct formation of silica aero-gel microparticles using supercritical solvents. J. Sol-Gel Sci Technol. 26: 645–649. CrossRef

Woignier, T.; and Phalippou, J. 1987. Skeletal density of silica aero-gels. J. Non-Cryst. Solids 93: 17-21. CrossRef

Kamiuto, K.; Saitoh, S.; and Tokita, Y. 1993. Scattering phase function of a silica aerogel at 450 nm wavelength J. Quant. Spectrosc. Radiant. Trans. 50: 293-327. CrossRef

Beck, Caps, R.; Frick, J. 1989. Scattering of Visible Light from Silica Aero-gels. J. Phys. D 22: 730-734. CrossRef

Jensen, K. I.; Schultz, J. M.; and Kristiansen, F. H. 2004. Development of windows based on highly insulating aero-gel glazing. J. Non-Cryst. Solids 350: 351–357. CrossRef

Schultz, J. M.; Jensen, K.I.; and Kristiansen, F. H. 2005. Super insulating aerogel glazing:Sol. Sol. Ener. Mat. Sol. cells. 89: 275–285. CrossRef

Buzykaev, A. R.; Danilyuk, A. F.; Ganzhur, S. F.; Kravchenko, E. A.; and Onuchin, A. P. 1999. Measurements of optical parameters of aero-gel. Nucl. Instr. Meth. Phys. Res. A 433: 396-400. CrossRef

Rao, A. Venkateswara; Nilsen E.; and Einarsrud, M. A. 2001. Effect of Precursors, Methyalation Agents and Solvents on the Physicochemical Properties of Silica Aero-gels Prepared by Atmospheric Pressure Drying Method. J. Non-Cryst. Solids, 296: 165-171. CrossRef

Kistler, S. S.; 1932. Coherent expanded aero-gels. J. Phys. Chem. 36: 52-64. CrossRef

Lee, K.-H.; Kim, S.-Y.; and Yoo, K. P. 1995. Low-density, hydrophobic aero-gels. J. Non-Cryst. Solids 186: 18-22. CrossRef

El Rassy, H.; Pierre, A.C.; 2005. NMR and IRspectroscopy of silica aerogels with different hydrophobic characteristics. J. Non-Cryst. Solids 351: 1603–1610. CrossRef

Deshpande, R.; Smith, D.; and Brinker, C.J. 1996. Preparation of High Porosity Xero-gels by Chemical Surface Modification US Patent 5, 565,142.

Hrubesh, L. W. 1998. Aero-gel applications. J. Non-Cryst. Solids 225: 335-342. CrossRef

Schmidt , M.; Schwertfeger, F. 1998. Applications for silica aero-gel products. J. Non-Crystal. Solids 225: 364–368. CrossRef

Ulrich, D.R. 1990. Prospects for sol-gel processes. J. Non-Cryst. Solids 121: 465-479. CrossRef

Fricke, J.; Tillotson, T. 1997. Aero-gels: production, characterization, and applications. Thin Solid Film 297: 212–223. CrossRef

Pierre, A.C.; Pajonk, G. M. 2002. Chemistry of aero-gels and their applications. Chem. Rev. 102:4243-4265. CrossRef

Adachi, I.; Sumiyoshi, T.; Hayashi, K.; Iida, N.; Enomoto, R.; Tsukada, K.; Suda, R.; Matsumoto, S.; Natori, K.; Yokoyama, M.; and Yokogawa, H. 1995. Study of threshold Cherenkov counter based on silica aerogels with low refractive indices. Nucl. Instr. Meth. Phys. Res. A 355: 390-398. CrossRef

Asner, D.; Butler, F.; Dominick, J.; Fadeyev, V.; Masek, G.; Nemati, B.; Skubic, P.; and Strynowski, R. 1996. Experimental study of aero-gel Cherenkov detectors for particle identification. Nucl. Instr. Meth. Phys. Res. A 374: 286-292. CrossRef

Sumiyoshi, T.; Adachi, I.; Enomotoi, R.; Iijima, T.; Suda, R.; Yokoyama, M.; and Yokogawa, H. 1998. Silica aero-gels in high energy physics. J. Non-Cryst. Solids 225: 369-374. CrossRef

Ishino, M.; Chiba, J.; En’yo, H.; Funahashi, H.; Ichikawa, A.; Ieiri, M.; Kanda, H.; Masaike, A.; Mihara, S.; Miyashita, T.; Murakami, T.; Nakamura, A.; Naruki, M.; Muto, R.; Ozawa, K.; Sato, H.D.; Sekimoto, M.; Tabaru, T.; Tanaka, K. H.; Yoshimura, Y.; Yokkaichi, S.; Yokoyama, M.; and Yokgawa, H. 2001. Mass production of hydrophobic silica aero-gel and readout optics of Cherenkov light. Nucl. Instr. Meth. Phys. Res. A 457: 581-587. CrossRef

DeLeo, R.; Lagamba, L.; Manzari, V.; Nappi, E.; Scognetti, T.; Alemi, M.; Becker, H.; Forty, R.; Adachi, I.; Suda, R.; Sumiyoshi, T.; Leone, A.; Perrino, R.; Matteuzzi, C.; Seguinot, J.; Ypsilantis, T.; Cisbani, E.; Frullani, S.; Garibaldi, F.; Iodice, M.; and Uriuoli, G.M. 1997. Electronic detection of focused Cherenkov rings from aero-gel. Nucl. Instr. Meth. Phys. Res A 401: 187-205. CrossRef

Anappara, A. A.; Rajeshkumar, S.; Mukundan, P.; Warrier, P. R. S.; Ghosh, S.; Warrier, K. G. K. 2004. Impedence spectroscopic studies of sol-gel derived subcritically dried silica aero-gels. Acta Mater. 52: 369-375. CrossRef

Rao, A. V.; Kulkarni, M. M.; Amalnerkar, D. P.; and Seth, T. 2003. Silica aero-gels based on methyltrimethoxysilane precursor. J. Non-cryst. Solids 330: 187-195. CrossRef

Nyquist, R. A.; Putzig, C. L.; Leugers, M. A.; Kagel, R. O.; and Nyquist, R. A. 1997. The handbook of infrared and Raman spectra of inorganic compounds and organic salts. San Diego: Academic Press. 18th Edn.

Brinker, C. J.; and Sherer, G.W. 1990. The Physics and Chemistry of Sol-Gel Processing. Academic Press.

Nicolaon, G. A.; and Teichner, S.J. 1968. Preparation of silica aero-gels from methyl orthosilicate in alcoholic medium, and their properties. Bull. Soc. Chim., 5: 1906 -1911.

Poco, J. F.; Coronado, P. R.; Pekala, R. W.; and Hrubesh, L.W. 1996. A Rapid Supercritical Extraction Process for the Production of Silica Aero-gels. Mater. Res. Soc. Symp. 431: 297-302. CrossRef

Gross, J.; Coronado, P.; and Hrubesh, L. 1998. Elastic properties of silica aero-gels from a new rapid supercritical extraction process. J. Non-Cryst. Solids 225: 282-286. CrossRef

Scherer, G.W.; Gross, J.; Hrubesh, L. W.; and Coronado, P. R. 2002. Mechanical Properties of Silica Alco-gels and Aero-gels. J. Non-Cryst. Solids 311: 259-272. CrossRef

Gauthier, B. M.; Bakrania, S. D.; Anderson, A. M.; and Carroll, M. K. 2004. Extraction Technique for Aero-gel Fabrication. J. Non-Cryst. Solids 350: 238–243. CrossRef

Kirkbir, F.; Murata, H.; Meyers, D.; and Ray Chaudhuri, S. 1998. Proceedings of the Fifth International Symposium on Aero-gels. J. Non-Cryst. Solids 225: 14-18. CrossRef

Tewari, P. H.; Hunt, A. J.; and Lofftus, K.D. 1985. Ambient-Temperature Supercritical Drying of Transparent Silica Aero-gels. Mater. Lett. 3: 363-367. CrossRef

Novak, Z., Knez, Z., and Hadolin, M. 1999. Second European Congress of Chemical Engineering. Montpellier.

Wawrzyniak, P.; Rogacki, G.; Pruba, J.; and Bartczak, Z. 2001. Effective diffusion coefficient in the low temperature process of silica aerogel production. J. Non-Cryst. Solids 285: 50–56. CrossRef

Ehrburger-Dolle, F.; Dallamano, J.; Elaloui, E.; Pajonk, G. 1995. Relations between the texture of silica aero- gels and their preparation. J. Non-Cryst. Solids 186: 9- 17. CrossRef

Yoda, S.; Ohshima, S. 1999. Supercritical drying media modification for silica aero-gel preparation. J. Non-Cryst. Solids 248: 224-234. CrossRef

Dieudonne, P.; Hafidi Alaoui, A.; Delord, P.; and Phalippou, J. 2000. Transformation of nanostructure of silica gels during drying. J. Non-Cryst. Solids 262: 155-161. CrossRef

Tajiri, K.; and Igarashi, K. 1998. The effect of the preparation conditions on the optical properties of transparent silica aero-gels. Solar Ener. Mater. Solar Cel. 54: 189-195. CrossRef

Land, V. D.; Harris, T. M.; and Teeters, D. C. 2001. Processing of low-density silica gel by critical point drying or ambient pressure drying. J. Non-Cryst. Solids. 283: 11-17. CrossRef

Rao, A. Venkateswara.; Rao, A. Parvathy.; and Kulkarni, M. M. 2004. Influence of gel aging and Na2SiO3/H2O molar ratio on monolithicity and physical properties of water-glass-based aero-gel dried at atmospheric pressure. J. Non-Cryst. Solids, 350: 224-229. CrossRef

Haereid, S.; Nilsen, E.; and Einarsrud, M. A. 1996. Properties of silica gels aged in TEOS. J. Non-Cryst. Solids, 204: 228-234. CrossRef

Rao, A. P.; Pajonk, G. M.; and Rao, A. V. 2005a. Hydrophobic and physical properties of the ambient pressure dried silica aero-gels with sodium silicate precursor using various surface modification agents. J. Mater. Sci. 40: 3481–3489. CrossRef

Davis, P. J.; Brinker, C. J.; and Smith, D. M. 1992a. Pore structure evolution in silica gel during aging/drying I. Temporal and thermal aging. J. Non-Cryst. Solids 142: 189-196. CrossRef

Davis, P.J.; Brinker, C.J.; Smith, D. M.; and Assink, R. A. 1992b. Pore structure evolution in silica gel during aging/drying II. Effect of pore fluids. J. Non-Cryst. Solids 142: 197-207. CrossRef

Deshpande, R.; Hua, D. W.; Smith, D. M.; and Brinker, C. J. 1992. Pore structure evolution in silica gel during aging/drying. III. Effects of surface tension. J. Non-Cryst. Solids 144: 32-34. CrossRef

Bhagat, S. D.; Kim, Y. H.; Ahn, Y.S.; and Yeo, J. G. 2007. Textural Properties of Ambient Pressure Dried Water Glass Based Silica Aero-gel Beads: One Day Synthesis. Micro. Meso. Mater. 96: 237-244. CrossRef

Sarawade, Pradip B.; Kim, Jong-Kil.; Hilonga, Askwar.; Kim, Hee Taik. 2010. Production of low-density sodium silicate-based hydrophobic silica aero-gel beads by a novel fast gelation process and ambient pressure drying process. Solid State Sci. 12: 911–918. CrossRef

Gurav, J. L.; Rao, A.V.; Rao, A. P.; Nadargi, D. Y.; and Bhagat, S.D. 2009. Physical Properties of Sodium Silicate Based Silica Aerogels Prepared by Single Step Sol−Gel Process Dried at Ambient Pressure. J. Alloys Compound. 476: 397-402. CrossRef

Klvana, D.; Chaouki, J.; Repellin-Lacroix, M.; and Pajonk, G. M. 1989. A new method of preparation of aero-gel like materials using a freeze-drying process. Le Journal de Physique Colloques 50: (C4-29–C4-32)

Mathieu, B.; Blacher, S.; Pirard, R.; Pirard, J. P.; Sahouli, B.; and Brouers, F.1997. Freeze-dried resorcinol-formaldehyde gels. J. Non-Cryst. Solids, 212: 250–261. CrossRef

Pajonk, G. M. 1989. Drying methods preserving the textural properties of gels. Le Journal de Physique Colloques, 50: (C4-13–C4-22).

Stolarski, M.; Walendziewski, J.; Steininger, M.; Pniak, B. 1999. Synthesis and characteristic of silica aero-gels, Appl. Catal. A: Gen. 177: 139-148. CrossRef

Yunos Nurul Hidayah Mohd; 2010. Loading capacity and release property of piperine loaded silica aero-gel and silica xero-gel. MSc Thesis. (Chemistry) Faculty of Science Universiti Teknologi Malaysia


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