相关实验视频
Updated: Sep 9, 2025
08:13
Preparation of Biopolymer Aerogels Using Green Solvents
Published on: July 4, 2016
17.8K
基托桑/聚乙烯醇气凝具有改善的隔热和降噪结构
Jing Peng1, Qiyue Xiao1, Jieyu Xue1
1National Engineering Laboratory for Modern Silk, College of Textile and Clothing Engineering, Soochow University, Suzhou 215000, PR China.
International journal of biological macromolecules
|August 29, 2025
概括
基托桑 (CS) 和聚乙醇 (PVA) 气凝为噪音污染提供了环保的解决方案. 这些轻质,多孔的材料具有出色的吸声和隔热性能.
科学领域:
- 材料科学
- 听力学
- 环境科学
背景情况:
- 噪音污染是一个日益严重的全球问题,影响健康和经济.
- 气凝具有多孔性和轻量化特性,可用于声学应用.
- 使用可生物降解材料,如酸盐 (CS) 和聚乙醇 (PVA) 解决了环境挑战.
研究的目的:
- 通过调整其成分来研究CS/PVA气凝的微观结构变化.
- 为了提高CS/PVA气凝的隔音性能.
- 探索这些环保气凝作为先进的声学材料的潜力.
主要方法:
- 通过不同的CS和PVA度的sol-gel工艺制造CS/PVA气凝
- 气凝微结构的特征,密度和多孔性.
- 声学属性的评估,包括声传输损失 (STL) 和降噪系数 (NRC).
- 对隔热能力的评估.
主要成果:
- 成功制造出具有超低密度 (0.0240 g·cm−3) 和高孔性的CS/PVA气凝.
- 在18毫米厚度下实现显著的声传输损失 (STL) >20dB (450-1000Hz,>3000Hz) 和降噪系数 (NRC) 0.428.
- 具有0.0387 W·m-1·K-1的最低导热率的有效隔热.
结论:
- CS/PVA气凝具有出色的声学性能,使其适用于降噪应用.
- 这种可调节的组合可以优化微观结构和声学特性.
- 这些可生物降解的气凝是解决声音和热绝缘问题的可持续和有效解决方案.
相关概念视频
01:22Thermal Insulation in Masonry Walls
187
In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh....
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh....
187
01:23Insulation Coordination
227
Insulation coordination is the process of matching electric equipment's insulation strength with protective device characteristics to protect the equipment against expected overvoltages. This selection is based on engineering judgment and cost. Equipment can generally withstand short-duration high transient overvoltages, but repeated tests with identical waveforms can yield inconsistent results. As a result, standard impulse voltage waveforms are used for testing, defined by specific times...
227
01:22Waterproofing and Anti-Bacterial Admixtures in Concrete
111
Concrete's susceptibility to water absorption is due to the capillary action within the pores of its hydrated cement paste. This action draws water in, creating the need for waterproofing admixtures to prevent such penetration. The efficacy of these admixtures is contingent upon the water pressure, with variations arising from different conditions such as rain, capillary rise, or hydrostatic pressure in structures intended to hold water.
Waterproofing admixtures render concrete hydrophobic,...
Waterproofing admixtures render concrete hydrophobic,...
111