2023-05-04 フィンランド・アールト大学
◆この研究では、果皮などのバイオ廃棄物から抽出できるペクチンを凍結乾燥した多孔質材料に変換することができることが示され、この材料は熱絶縁性能に優れています。
◆研究者たちは、地元のK-マーケットと協力して、バイオ廃棄物から原材料を直接収集する方法を模索しています。
＜関連情報＞
- https://www.aalto.fi/en/news/a-sugar-extracted-from-biowaste-can-provide-a-sustainable-and-more-efficient-method-for-sound
- https://www.sciencedirect.com/science/article/pii/S1385894723009671
異方性ペクチンクライオゲルの吸音・断熱・機械的強度の最大化 Maximizing sound absorption, thermal insulation, and mechanical strength of anisotropic pectin cryogels
Fangxin Zou, Jose Cucharero, Yujiao Dong, Pinja Kangas, Ya Zhu, Janne Kaskirinne, Girish C. Tewari, Tuomas Hänninen, Tapio Lokki, Hailong Li, Jaana Vapaavuori
Chemical Engineering Journal Available: online 3 March 2023
DOI:https://doi.org/10.1016/j.cej.2023.142236
Highlights
•Pectin cryogels with hierarchically anisotropic porous structures are fabricated.
•The average sound absorption coefficient of cryogel is up to 0.76 in 500–6000 Hz.
•Sound absorption is accompanied by excellent mechanical and thermal properties.
•The performance can be controlled by freezing temperature and NaCl concentration.
Abstract
Effective use of sound absorption materials is the main way to reduce noise pollution, which constitutes a major environmental and health problem. However, the currently used porous sound absorption materials cause not only environmental pollution but their usage is also a potential health risk. Here, we demonstrate a facile strategy to create environmental-friendly and non-toxic lightweight pectin-based cryogels with hierarchically porous anisotropic structure, which integrates small pores on the walls of lamellar pores, via freeze-casting method. The fabricated pectin cryogels have better sound absorption performance (average sound absorption coefficient up to 0.76 in 500–6000 Hz), higher compression modulus (300 to 700 times higher than commercial glass wool), and comparable thermal conductivity comparing to other reported bio-based porous materials. Moreover, the sound absorption performance could be enhanced and optimized by tuning the pore wall density of lamellar pores and the size of small pores to the level of viscous and thermal layers via increasing of freeze-casting temperature and adding NaCl in pectin solution prior to the freeze-casting process. The outstanding sound absorption is linked to the unique hierarchically porous morphology of these cryogels. This strategy paves the way for the design of bio-based porous anisotropic materials for highly efficient noise absorption.
