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Advances in Acoustics and Vibration
Volume 2016, Article ID 5971814, 8 pages
http://dx.doi.org/10.1155/2016/5971814
Research Article

Physical and Acoustical Properties of Corn Husk Fiber Panels

1Department of Mechanical Engineering, Faculty of Engineering, Mataram University, Nusa Tenggara Barat, Indonesia
2Department of Mechanical Engineering, Faculty of Engineering, Brawijaya University, East Java, Indonesia

Received 25 August 2016; Revised 14 November 2016; Accepted 21 November 2016

Academic Editor: Benjamin Soenarko

Copyright © 2016 Nasmi Herlina Sari et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This research focuses on the development of a sustainable acoustic material comprising natural fibers of corn husk that were alkali modified by 1%, 2%, 5%, and 8% NaOH. The morphology and the acoustical, physical, and mechanical properties of the resulting fibers were experimentally investigated. Five different types of sample were produced in panel form, the acoustical properties of which were studied using a two-microphone impedance tube test. The porosity, tortuosity, and airflow resistivity of each panel were investigated, tensile tests were conducted, and the morphological aspects were evaluated via scanning electron microscopy. The sound absorption and tensile properties of the treated panels were better than those of raw fiber panels; the treated panels were of high airflow resistivity and had low porosity. Scanning electron micrographs of the surfaces of the corn husk fibers revealed that the different sound absorption properties of these panels were due to roughness and the lumen structures.