Utilization and Study of Raw Groundnut Shell as a Source of Sound Absorbing Material

ABSTRACT

Natural biodegradable materials have the potential of an alternative traditional sound-absorbing material. These materials have the advantages of low cost, light in weight, easily available, eco-friendly, and nonpolluting. Groundnut shell is a cover of the peanuts and considered an agriculture waste material that can be used in the field of noise control. This study highlights the possibility of the groundnut shell material as a sound absorption material by evaluating the acoustical properties like Air Flow Resistivity (AFR) and Sound Absorption Coefficient (SAC). Three different samples made of groundnut shell with thicknesses 10, 20, and 30 mm have been considered for the analysis. The effect of thickness and the air gap of the different samples on the acoustics parameters have been discussed. The experimental results show that the AFR decreases with increasing thickness of the sample material while a sound absorption coefficient (SAC) is found higher values at medium and high frequency (from 1000 to 4000 Hz). This study will be useful for the development of new sound absorbing material.

摘要

利用不同的质子、非质子和碱性溶剂对纤维素进行溶胀，这些溶剂能够穿透纤维素的结晶部分，是提高纤维素的可接近性和改性反应活性的重要方法之一. 本文利用FTIR、固态13cnmr和DSC热分析等方法，讨论了未干燥的Lyocell纤维在不同溶剂和水溶液溶胀时纤维素II结构的变化. 纤维的保水性和可及性的变化与溶剂相关的纤维结构变化有关，并与FTIR和13cnmr光谱结果一致.

KEYWORDS:

• Acoustic absorption
• air flow resistivity (afr)
• groundnut shell
• natural fiber
• sound absorption coefficient (sac)

关键词:;:

• ¹³CCP/MAS-NMR
• 结晶度
• DSC
• FTIR
• 肿胀

Data Availability

Authors can confirm that all relevant data are included in the article and/or its supplementary information files.

Disclosure statement

There is no conflict of interest from author’s side.