Silica-Aerogel Cotton Composites as Sound Absorber
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 9
Abstract
In the research reported in this paper, silica aerogel was synthesized in a cotton nonwoven mat (CNM) and then the composite was used as a sound absorber. The experimental data indicated that using aerogel as a coating on CNM significantly improved sound absorption up to 2,500 Hz. However for higher frequencies silica aerogel coating reduced sound absorption compared to neat CNM. The best sound absorption performance of the CNM coated aerogel happened between 250 and 2,500 Hz. The effects of different processing conditions were studied on the final properties of the silica aerogel and consequently on the sound absorption of the coated CNM. The pore size and surface area of the synthesized silica aerogel had no direct influence on the sound absorption properties of the composites; on the other hand, the density of the silica aerogel was the only critical factor that determined the sound absorption coefficients of the composites.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
The writers would like to acknowledge the Iran National Science Foundation for the financial support and also Iran Test and Research Auto Company (ITRAC) for carrying out the sound absorption tests.
References
Barrett, E. P., Jyner, L. G., and Halenda, P. P. (1959). “The determination of pore volume and area distributions in porous substances. I. Computations from nitrogen isotherms.” J. Am. Chem. Soc., 73(1), 373–380.
Burger, T., and Fricke, J. (1998). “Aerogel: Modification and applications.” Berichte der Bunsengesellschaf fur Physikalische Chemie, 102(11), 1523–1528 (in German).
Cabot. (2013). “Why aerogel solutions?” 〈http://www.cabot-corp.com/Aerogel/Daylighting/Why-Aerogel-Solutions〉 (Dec. 11, 2013).
Campolina, B., Dauchez, N., Atalla, N., and Doutres, O. (2012). “Effect of porous material compression on the sound transmission of a covered single leaf panel.” Appl. Acoust., 73(8), 791–797.
Castagnede, B., Aknine, A., Brouard, B., and Tarnow, V. (2000). “Effects of compression on the sound absorption of fibrous materials.” Appl. Acoust., 61(2), 173–182.
Conroy, J., Hosticka, B., Davis, S., Smith, A., and Norris, P. (1999). “Microscale thermal relaxation during acoustic propagation in aerogel and other porous media.” Microscale Thermophys. Eng., 3(3), 199–215.
Cross, J., Goswin, R., Gerlach, R., and Fricke, J. (1989). “Mechanical properties of aerogels.” J. Phys. Colloques, 50(C4), 185–190.
Forest, L., Gibiat, V., and Hooley, A. (2001). “Impedance matching and acoustic absorption in granular layers of silica aerogels.” J. Non-Cryst. Solids, 285(1–3), 230–235.
Forest, L., Gibiat, V., and Woignier, T. (1998). “Biot’s theory of acoustic propagation in porous media applied to aerogels and alcogels.” J. Non-Cryst. Solids, 225, 287–292.
Gerlach, R., Kraus, O., Fricke, J., Eccardt, P., Kroemer, N., and Magori, V. (1992). “Modified aerogels as acoustic impedance matching layers in ultrasonic devices.” J. Non-Cryst. Solids, 145, 227–232.
Gibiat, V., Lefeuvre, O., Woignier, T., Pelus, J., and Phalippou, J. (1995). “Acoustic properties and potential applications of silica aerogels.” J. Non-Cryst. Solids, 186, 244–255.
Gronauer, M., and Fricke, J. (1986). “Acoustic properties of micro-porous -aerogel.” Acta Acustica United with Acustica, 59(3), 177–181.
Gross, J., and Fricke, J. (1992). “Ultrasonic velocity measurements in silica, carbon and organic aerogels.” J. Non-Cryst. Solids, 145, 217–222.
Hao, A., Zhao, H., and Chen, J. Y. (2013). “Kenaf/polypropylene nonwoven composites: The influence of manufacturing conditions on mechanical, thermal and acoustical performance.” Compos. Part B, 54, 44–51.
Hench, L., and West, J. (1990). “The sol gel processs.” Chem. Rev., 90(1), 33–72.
Keshavarz, R., and Ohadi, A. (2013). “Effects of compression on sound absorption of transversely isotropic fibrous materials at oblique incidence.” Appl. Acoust., 74(3), 383–395.
Omranpour, H., and Motahari, S. (2013). “Effects of processing conditions on silica aerogel during aging: Role of solvent, time and temperature.” J. Non-Cryst. Solids, 379, 7–11.
Pierre, A., and Pajonk, G. (2002). “Chemistry of aerogels and their applications.” Chem. Rev., 102(11), 4243–4266.
Rey, R., Alba, J., Arenas, J., and Sanchis, V. (2012). “An empirical modelling of porous sound absorbing materials made of recycled foam.” Appl. Acoust., 73(6–7), 604–609.
Schmidt, M., and Schwertfeger, F. (1998). “Applications of silica aerogel products.” J. Non-Cryst. Solids, 225, 364–368.
Zimmermann, A., Gross, J., and Fricke, J. (1995). “Constant-Q acoustic attenuation in silica aerogels.” J. Non-Cryst. Solids, 186, 238–243.
Information & Authors
Information
Published In
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jul 3, 2014
Accepted: Sep 29, 2014
Published online: Nov 3, 2014
Discussion open until: Apr 3, 2015
Published in print: Sep 1, 2015
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.