Facile synthesis of highly porous silica aerogel granules and its burning behavior under radiation
Source abstract
Abstract
In this paper, alcogel granules were obtained in n-hexane using tetraethoxysilane as the precursor. Solvent exchange and surface modification were processed synchronously, followed by ambient pressure drying. The whole process can be completed within 12 h. To minimize shrinkage during drying process, N,N-Dimethylacetamide (C4H9NO, DMA), acting as drying control chemical additive, was introduced. The critical point of DMA was studied and determined to be at n(TEOS)/n(DMA) = 2. The resulting aerogels have a well-developed mesoporous structure, low tap density (0.086 g/cm3), extremely large specific surface area (1267 m2/g), super hydrophobicity (⊖ = 162°) and uniform pore size distribution. Particularly, the aerogels’ burning behavior was studied using cone calorimeter under various radiant heat flux. It’s found that when the heat flux reaches to 50 kW/m2, the aerogel’s combustion type turns to flame from smoulder. O2 depletion and CO2 production rise. Heat relesase rate and total heat release increase significantly.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Aerogels and thermal insulation · Catalytic Processes in Materials Science · Catalysis and Oxidation Reactions
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (37)
Show source-provided references
1. Gurav JL, Rao AV, Bangi UKH (2009) Hydrophobic and low density silica aerogels dried at ambient pressure using TEOS precursor. JAllC 471(1–2):296–302
2. Wingfield C, Franzel L, Bertino MF, Leventis N (2011) Fabrication of functionally graded aerogels, cellular aerogels and anisotropic ceramics. JMCh 21(32):11737–11741
3. Venkateswara Rao A, Kalesh RR (2003) Comparative studies of the physical and hydrophobic properties of TEOS based silica aerogels using different co-precursors. Sci Technol Adv Mat 4(6):509–51510.1016/j.stam.2003.12.010 ↗
4. Kim Kyekyoon KYJ, Ravindra S (1991) Upadhye, hollow silica spheres of controlled size and porosity by sol—gel processing. J Am Ceram Soc 74(8):1987–199210.1111/j.1151-2916.1991.tb07819.x ↗
5. Pajonka GM (1991) Aerogel catalysts. Appl Catal 72:217–26610.1016/0166-9834(91)85054-Y ↗
6. Yokogawa H, Yokoyama M (1995) Hydrophobic silica aerogels. J Non-Cryst Solids 186:23–2910.1016/0022-3093(95)00086-0 ↗
7. Cabañas A, Enciso E, Carbajo Carmen M, Torralvo MJ, Pando C, Renuncio JAR (2007) Studies on the porosity of SiO2-aerogel inverse opals synthesised in supercritical CO2. Micropor Mesopor Mat 99(1–2):23–2910.1016/j.micromeso.2006.08.030 ↗
8. He F, Zhao H, Qu X, Zhang C, Qiu W (2009) Modified aging process for silica aerogel. J Mater Process Technol 209(3):1621–162610.1016/j.jmatprotec.2008.04.009 ↗
9. Hunt AJ, Lofftus KD, Tewari PH (1985) Ambient-temperature supercritical drying of transparent silica aerogels. Mater Lett 3(9,10):363–367
10. Estella J, Echeverría JC, Laguna M, Garrido JJ (2008) Effect of supercritical drying conditions in ethanol on the structural and textural properties of silica aerogels. J. Porous Mater 15(6):705–71310.1007/s10934-007-9156-9 ↗
11. Kistler SS (1931) Coherent expanded-aerogels. J Phys Chem 36(1):52–6410.1021/j150331a003 ↗
12. Smith DM, Deshpande R, Jeffrey Brinke C (1992) Preparation of low-density aerogels at ambient pressure. MRS Online Proceedings Library Archive 271:56710.1557/PROC-271-567 ↗
13. Deshpande R, Smith DM, Brinker CJ (1996) Preparation of high porosity xerogels by chemical surface modification: U.S. Patent 5,565,142. U.S. Patent and Trademark Office, Washington, DC
14. Douglas DS, Smith M, Julie M (1995) Anderson, William Ackerman, preparation of low-density xerogels at ambient pressure. J Non-Cryst Solids 186:104–11210.1016/0022-3093(95)00040-2 ↗
15. Kim CE, Yoon JS, Hwang HJ (2008) Synthesis of nanoporous silica aerogel by ambient pressure drying. JSGST 49(1):47–5210.1007/s10971-008-1828-7 ↗
16. Uchida N, Ishiyama N, Kato Z, Uematsu K (1994) Chemical effects of DCCA to the sol-gel reaction process. JMatS 29:5188–5192
17. Gurav JL, Nadargi DY, Rao AV (2008) Effect of mixed Catalysts system on TEOS-based silica aerogels dried at ambient pressure. Appl Surf Sci 255(5):3019–302710.1016/j.apsusc.2008.08.059 ↗
18. Hilonga A, Kim J-K, Sarawade PB, Kim HT (2009) Low-density TEOS-based silica aerogels prepared at ambient pressure using isopropanol as the preparative solvent. JAllC 487(1–2):744–750
19. Wu G, Yu Y, Cheng X, Zhang Y (2011) Preparation and surface modification mechanism of silica aerogels via ambient pressure drying. Mater Chem Phys 129(1–2):308–31410.1016/j.matchemphys.2011.04.003 ↗
20. Shi F, Wang L, Liu J (2006) Synthesis and characterization of silica aerogels by a novel fast ambient pressure drying process. Mater Lett 60(29–30):3718–372210.1016/j.matlet.2006.03.095 ↗
21. Hong SK, Yoon MY, Hwang HJ, Ehrman S (2011) Fabrication of spherical silica aerogel granules from water glass by ambient pressure drying. J Am Ceram Soc 94(10):3198–320110.1111/j.1551-2916.2011.04765.x ↗
22. He S, Li Z, Shi X, Yang H, Gong L, Cheng X (2015) Rapid synthesis of sodium silicate based hydrophobic silica aerogel granules with large surface area, Adv Powder Technol 26(2):537–54110.1016/j.apt.2015.01.002 ↗
23. He S, Huang D, Bi H, Li Z, Yang H, Cheng X (2015) Synthesis and characterization of silica aerogels dried under ambient pressure based on water glass. J Non-Cryst Solids 410(0):58–6410.1016/j.jnoncrysol.2014.12.011 ↗
24. Smith DM, Maskara A, Boes U (1998) Aerogel-based thermal insulation, . J Non-Cryst Solids 225(1):254–25910.1016/S0022-3093(98)00125-2 ↗
25. Venkateswara Rao* HMSA, Tamhankar AK, Shinde ML, Gadave DB, Wagh PB (1999) Influence of N,N-dimethylformamide additive on the physical properties of citric acid catalyzed TEOS silica aerogels. Mater Chem Phys 60:268–27310.1016/S0254-0584(99)00089-9 ↗
26. ISO 5660-1, Reaction to Fire Tests e Heat Release Smoke Production and Mass Loss Rate Part1 Heat Release Rate, 2002
27. Scherer GW (1997) Effect of drying on properties of silica gel. J Non-Cryst Solids 215:155–16810.1016/S0022-3093(97)00079-3 ↗
28. Prakash SS, Brinker CJ, Hurd AJ, Rao SM (1995) Silica aerogel films prepared at ambient-pressure by using surface derivatization to induce reversible drying shrinkage. Nature 374(6521):439–44310.1038/374439a0 ↗
29. Leventis N, Lu H (2011) Polymer-Crosslinked Aerogels. In: Aegerter MA, Leventis N, & Koebel MM (Eds) Aerogels Handbook. Springer, New York, pp 251–28510.1007/978-1-4419-7589-8_13 ↗
30. Haranath AVRAPBWD (1999) Influence of DCCAs on optical transmittance and porosity properties of TMOS silica aerogels. J Porous Mater 6:55–6210.1023/A:1009649403740 ↗
31. Song He XDC, Bi HaiJiang, Yang Hui (2014) Synthesis and effect of DCCA on the ambient pressure dried, TEOS-based silica aerogel. Adv Mater Res 1044-1045:119–12310.4028/www.scientific.net/AMR.1044-1045.119 ↗
32. Brinker Jeffrey GWSC (1990) Sol-Gel Science—The physics and chemistry of sol-gel processing. Academic Press, San Diego, NewYork
33. DIS I (1990) 5660, Fire tests—Reaction to fire—rate of heat release from building products. International Organization for Standardization, Geneva, Switzerland
34. El354 ASTM (1994) Standard test method for heat and visible smoke release rate for materials and products using an oxygen consumption calorimeter. 1997 Annual Book of ASTM Standards, 4, 649–666
35. ASTM E-906 (1998) standard test method for heat and visible smoke release rates for materials and products, American Society for testing and materials, West Conshohocken, PA
36. Thornton WM (1917) XV. The relation of oxygen to the heat of combustion of organic compounds. Philosophical Magazine Series 6(33(194)):196–20310.1080/14786440208635627 ↗
37. Huggett C (1980) Estimation of rate of heat release by means of oxygen consumption measurements. Fire Mater 4(2):61–6510.1002/fam.810040202 ↗