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The effect of natural fiber sound absorption performance on sodium hydroxide treatment

Nasidi, Ida Norfaslia and Ismail, Lokman Hakim and Samsudin, Emedya Murniwaty (2018) The effect of natural fiber sound absorption performance on sodium hydroxide treatment. In: 25th International Congress on Sound and Vibration, 8-12 July 2018, Hiroshima, Japan.

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Empty fruit bunch and coconut coir are among major agricultural wastes that is readily available in the form of fiber. Previous studies have proven that those wastes are among natural fibers that are viable for sound absorption material. Nevertheless, those fibers contain residue and residual oil that needs to be removed using pre-treatment procedure. In this research, sodium hydroxide (NaOH) treatment is applied in different concentration, zero to ten percent. The treated empty fruit bunch and coconut coir fibers were used as composite material by adding urea formalde-hyde as the resin binder. Impedance tube using two microphones method was used to measure the effects of pre-treatment towards the acoustical performance of the fiber composites at low and high frequency bands. Changes on the surface morphology of the treated fibers were exam-ined using Scanning Electron Microscope (SEM) analysis. Findings indicated that as the NaOH concentration increased, it will cause the surface roughness of the fibers to increase; thus, re-sulted in more energy to dissipate. Empty fruit bunch only required two percent of NaOH con-centration while coconut coir required slightly higher NaOH concentration at eight percent in order to achieve maximum absorption of 0.65 coefficients. This research concluded that pre-treatment using NaOH changed the surface morphology of the fibers and improved the absorp-tion capabilities of empty fruit bunch and coir fiber as sound absorber.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Uncontrolled Keywords: Sodium hydroxide; sound absorption; EFB; coir fiber.
Subjects: T Technology > T Technology (General)
Depositing User: Mr Abdul Rahim Mat Radzuan
Date Deposited: 09 Mar 2020 04:05
Last Modified: 09 Mar 2020 04:05
URI: http://eprints.uthm.edu.my/id/eprint/12795
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