The densities, pore sizes and specific surface areas of the silica aerogels were in the range of 0.273-0.849 g cm-3, 3.24-10.22 nm, and 238-726 m2g-1, respectively.
📌 3 Key Takeaways
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Objective & Hypothesis:In this study, the experimental results of the surface area, morphology, and density of silica aerogels obtained at different preparation conditions are reported.
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Key Findings & Data:The aerogels have been produced by sol-gel process followed by ambient pressure drying.
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Conclusion & Impact:The densities, pore sizes and specific surface areas of the silica aerogels were in the range of 0.273-0.849 g cm-3, 3.24-10.22 nm, and 238-726 m2g-1, respectively.
In this study, the experimental results of the surface area, morphology, and density of silica aerogels obtained at different preparation conditions are reported. The aerogels have been produced by sol-gel process followed by ambient pressure drying. Rice hull ash silicate solution was used as an inexpensive precursor. The type of acids and gelation pH has strongly affected the structural properties of the final products. The silica aerogels have a well-developed nanoporous structure and a high specific surface area. The densities, pore sizes and specific surface areas of the silica aerogels were in the range of 0.273-0.849 g cm-3, 3.24-10.22 nm, and 238-726 m2g-1, respectively.
KARAKUZU, B., TEMEL, T. M., YÜCEL, S., TERZİOĞLU, P., ELALMIŞ, Y. (2016). EFFECT OF ACID TYPE AND GELATION pH ON THE STRUCTURAL PROPERTIES OF SILICA AEROGELS PREPARED BY USE OF RICE HULL BIOSILICA. Sigma Journal of Engineering and Natural Sciences, Cilt: 34 Sayı: 2, 175–182. https://ajindex.com/articles/897852
Wang J., Zhou Q., Song D., et.al., “Chitosan–silica composite aerogels: preparation, characterization and Congo red adsorption”, J Sol-Gel Sci Technol, 76,501–509, 2015
Pierre A.C., Pajonk G.M. “Chemistry of aerogels and their applications”. Chem Rev., 102, 11, 4243–4265, 2002
Yücel S., Terzioğlu P., Aydın-Sinirlioğlu Z., et al., “Synthesis, Characterization, In Vitro Degradability and Bioactivity of Strontium Substituted Rice Hull Ash Silica Based Melt Derived 45S5 Bioactive Glass”, Journal of Engineering and Natural Sciences, Sigma 33, 23-32, 2015
Tzong-Horng L., Chun-Chen Y., “Synthesis and surface characteristics of nanosilica produced from alkali-extracted rice husk ash”, Mater. Sci. Eng., B, 176, 521–529, 2011
Shi F., Wang L., Liu J., “Synthesis and characterization of silica aerogels by a novel fast ambient pressure drying process”, Mater Lett, 60, 29–30, 3718–3722, 2006
Shewale P. M., Rao A. V., Rao A. P., “Effect of different trimethyl silylating agents on the hydrophobic and physical properties of silica aerogels”, App Surface Sci, 254, 6902–6907, 2008
Tadjarodi A., Haghverdi M., Mohammadi V., “Preparation and characterization of nano-porous silica aerogel from rice husk ash by drying at atmospheric pressure”, Mater. Res. Bull., 47, 2584–2589, 2012
Leofanti G., Padovan M., Tozzola G., et al., “Surface area and pore texture of catalysts”, Catal. Today, 41, 207–219, 1998
Bhagat S.D., Kim Y.H., Moon M.J., et al., “A cost-effective and fast synthesis of nanoporous SiO2 aerogel powders using water-glass via ambient pressure drying route”, Solid State Sci., 9, 628–635, 2007
Yan X. X., Deng H. X., Huang X. H., et al., “Mesoporous bioactive glasses. I. Synthesis and structural characterization”, J. Non-Cryst. Solids, 351, 40, 3209-3217, 2005
Sinkó K., “Influence of Chemical Conditions on the Nanoporous Structure of Silicate Aerogels”, Materials, 3, 704-740, 2010
Lee S., Cha Y. C., Hwang H. J., et al., “The effect of pH on the physicochemical properties of silica aerogels prepared by an ambient pressure drying method”, Mater Lett, 61, 3130–3133, 2007
Kim C. E., Yoon J. S., Hwang H. J., “Synthesis of nanoporous silica aerogel by ambient pressure drying” J Sol-Gel Sci Technol, 49,47–52,2009
Kocon L., Despetis F., Phalippou J., “Ultralow density silica aerogels by alcohol supercritical drying”, J Non-Cryst Solids, 225, 1998, 96–100