Ekbatani Shahed, Rattanawongkun Phattharasaya, Klayya Supattra, Papageorgiou Dimitrios G, Soykeabkaew Nattakan, Zhang Han
School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, UK.
Center of Innovative Materials for Sustainability (iMatS), School of Science, Mae Fah Luang University, 333 M1, Muang, Chiang Rai 57100, Thailand.
Polymers (Basel). 2025 Jan 22;17(3):281. doi: 10.3390/polym17030281.
Effective sound absorption materials are essential for mitigating noise pollution in urban and industrial environments, which pose serious health risks to humans. This work develops a hierarchical natural fibre binderless composite based on porous luffa, modified with localised cellulose nanocrystals (CNCs), for application in acoustic panels. The impedance tube approach was employed to systematically evaluate sound absorption performance across a range of frequencies. Adding 3 wt.% and 7 wt.% CNCs to the porous luffa structure improved its sound absorption, especially in mid-to-high frequency areas. The binderless luffa panels with 3% CNC panels exhibited the most balanced performance across various thicknesses, while 7% CNC-luffa panels demonstrated excellent sound absorption averages across all frequency ranges, although increased rigidity and reflective tendencies were observed. The nano-modification successfully maintained the sound absorption coefficient with reduced panel thickness. This study establishes CNC-modified luffa composites as a sustainable and efficient alternative to conventional acoustic materials, leveraging renewable resources and lightweight characteristics. These findings highlight the potential of CNC-luffa composites for noise mitigation, paving the way for environmentally conscious acoustic solutions.
有效的吸声材料对于减轻城市和工业环境中的噪声污染至关重要，这些环境对人类健康构成严重风险。这项工作开发了一种基于多孔丝瓜的分级天然纤维无粘结剂复合材料，用局部纤维素纳米晶体（CNC）进行改性，用于吸音板。采用阻抗管方法系统地评估了一系列频率下的吸声性能。向多孔丝瓜结构中添加3 wt.%和7 wt.%的CNC可改善其吸声性能，尤其是在中高频区域。含3% CNC的无粘结剂丝瓜板在各种厚度下表现出最平衡的性能，而含7% CNC的丝瓜板在所有频率范围内均表现出优异的平均吸声性能，尽管观察到其刚性增加和反射倾向增强。纳米改性成功地在减小板厚的情况下保持了吸声系数。本研究将CNC改性丝瓜复合材料确立为传统声学材料的一种可持续且高效的替代品，利用了可再生资源和轻质特性。这些发现突出了CNC丝瓜复合材料在降噪方面的潜力，为注重环保的声学解决方案铺平了道路。
