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Polyimide Aerogel Membranes with Adjustable Transparency and High Flexibility for Highly Efficient Solar Thermal Collection
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-05-21 , DOI: 10.1021/acssuschemeng.1c02042 Xianbo Hou 1 , Rubing Zhang 1, 2 , Daining Fang 3
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-05-21 , DOI: 10.1021/acssuschemeng.1c02042 Xianbo Hou 1 , Rubing Zhang 1, 2 , Daining Fang 3
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Aerogel-based solar collectors inherently possess superinsulated performance, which can achieve green and sustainable thermal collection under atmospheric pressure without the need of a vacuum gap. However, the inherent brittleness, low transparency, and weak mechanical properties of aerogels limit the practical application as solar collectors. Herein, polyimide aerogel membranes (PIAMs) with integrated properties of robust flexibility, high transparency, and low thermal conductivity have been prepared. The prepared PIAMs achieve the adjustable transparency and significant transformation from fragility to high flexibility by introducing the asymmetric molecular structure. In particular, the prepared PIAMs realize an average optical transmittance of ∼90% over the long wavelength range of 500–2650 nm and exhibit high flexibility, a low density of 0.161 g/cm3, a low thermal conductivity of 0.045 W/mK, and a robust tensile strength of 6.02 MPa. Moreover, a simple and low-cost parabolic trough solar collecting device is assembled using PIAMs as an exterior structure, which could operate at atmospheric conditions and achieve highly efficient thermal collection. The results demonstrate that the effective thermal collecting temperature of solar collector was up to 231.5 °C. The as-prepared PIAMs with robust flexibility and high optical transparency can be used as the candidate for the application of solar collectors and advanced optical elements.
中文翻译：
具有可调节透明度和高灵活性的聚酰亚胺气凝胶膜，用于高效太阳能热收集
基于气凝胶的太阳能集热器本身具有超绝缘性能，可以在大气压下实现绿色和可持续的集热，无需真空间隙。然而，气凝胶固有的脆性、低透明度和弱机械性能限制了其作为太阳能集热器的实际应用。在此，已经制备了具有强柔韧性、高透明度和低导热性的综合特性的聚酰亚胺气凝胶膜（PIAM）。通过引入不对称分子结构，制备的 PIAMs 实现了可调节的透明度和从脆弱到高柔韧性的显着转变。特别是，制备的 PIAM 在 500-2650 nm 的长波长范围内实现了约 90% 的平均光透射率，并表现出高灵活性，低密度为 0.3，0.045 W / mK的导热系数低，和6.02 MPa的健壮的拉伸强度。此外，使用PIAM作为外部结构组装了一个简单且低成本的抛物线槽式太阳能收集装置，该装置可以在大气条件下运行并实现高效的热收集。结果表明，太阳能集热器的有效集热温度高达231.5℃。所制备的 PIAM 具有强大的灵活性和高光学透明度，可用作太阳能收集器和先进光学元件应用的候选者。
更新日期：2021-06-07
中文翻译：
具有可调节透明度和高灵活性的聚酰亚胺气凝胶膜，用于高效太阳能热收集
基于气凝胶的太阳能集热器本身具有超绝缘性能，可以在大气压下实现绿色和可持续的集热，无需真空间隙。然而，气凝胶固有的脆性、低透明度和弱机械性能限制了其作为太阳能集热器的实际应用。在此，已经制备了具有强柔韧性、高透明度和低导热性的综合特性的聚酰亚胺气凝胶膜（PIAM）。通过引入不对称分子结构，制备的 PIAMs 实现了可调节的透明度和从脆弱到高柔韧性的显着转变。特别是，制备的 PIAM 在 500-2650 nm 的长波长范围内实现了约 90% 的平均光透射率，并表现出高灵活性，低密度为 0.3，0.045 W / mK的导热系数低，和6.02 MPa的健壮的拉伸强度。此外，使用PIAM作为外部结构组装了一个简单且低成本的抛物线槽式太阳能收集装置，该装置可以在大气条件下运行并实现高效的热收集。结果表明，太阳能集热器的有效集热温度高达231.5℃。所制备的 PIAM 具有强大的灵活性和高光学透明度，可用作太阳能收集器和先进光学元件应用的候选者。
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