受珊瑚启发的不对称多孔辐射冷却生物膜与热塑性聚氨酯增强机械耐受性作为建筑节能围护结构,ACS Applied Polymer Materials

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受珊瑚启发的不对称多孔辐射冷却生物膜与热塑性聚氨酯增强机械耐受性作为建筑节能围护结构
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2023-11-09 , DOI: 10.1021/acsapm.3c01914
Haoran Cai ₁ , Shuangjiang Feng ₁ , Mingxin Feng ₁ , Xu He ₁ , Chenghuan Liu ₁ , Man He ₁ , Xiaohai Bu _{1,

2} , Jun Huang ₃ , Yuming Zhou ₁

Affiliation

被动辐射冷却（PRC）是一种新兴的无能源冷却策略，它反射太阳辐射并将热量散发到外太空，以实现低于环境温度的冷却温度。尽管取得了显着进展，PRC薄膜在实际应用中的大规模商业化仍然是一个挑战，特别是在它们包封复杂表面的能力和长期使用的机械公差方面。在此，我们受天然珊瑚的启发，制造了一种尺寸和厚度可控的不对称珊瑚状多孔醋酸纤维素/热塑性聚氨酯（CA/TPU）薄膜。珊瑚状孔隙的不对称结构增强了阳光穿过孔隙的散射，羟基磷灰石纳米棒（HAP NR）的引入增强了红外发射。此外，CA的聚合物分子链与弹性体TPU之间的交联使PRC生物膜具有出色的机械耐受性和柔韧性，可拉伸至236.2%。因此，PRC生物膜表现出高达97.26%的太阳反射率和97.22%的红外发射率，在1550 W/m 2 的太阳辐射下，导致低于环境温度下降9.2 ° ^C。PRC生物膜有望在实际应用中用作建筑物、车辆和纺织品的节能围护结构。

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Coral-Inspired Asymmetrically Porous Radiative Cooling Biofilm with Thermoplastic Polyurethane-Enhanced Mechanical Tolerance as Building Energy-Saving Envelope

Passive radiative cooling (PRC) is an emerging energy-free cooling strategy that reflects solar radiation and emits heat into outer space to achieve a cooling temperature below ambient. Despite notable progress, large-scale commercialization of PRC films for practical applications still remains a challenge, specifically in terms of their ability to envelope complex surfaces and the mechanical tolerance for prolonged utilization. Herein, we fabricated an asymmetrically coral-like porous cellulose acetate/thermoplastic polyurethane (CA/TPU) film with controllable size and thickness inspired by natural coral. The asymmetrical structure with coral-shaped pores enhances the scattering of sunlight across the apertures, and the introduction of hydroxyapatite nanorods (HAP NRs) strengthens the infrared emission. Additionally, the cross-linking between the polymer molecular chains of CA and elastomer TPU enables the PRC biofilm outstanding mechanical tolerance and flexibility which can be stretched to 236.2%. As a result, the PRC biofilm exhibits high solar reflectivity of 97.26% and infrared emissivity of 97.22%, contributing to a subambient temperature drop of 9.2 °C under solar radiation of 1550 W/m². The PRC biofilm is expected to be utilized as an energy-saving envelope structure for buildings, vehicles, and textiles in practical applications.

更新日期：2023-11-09

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