ENERGY AND BUILDINGS
·
2024
·
IF 6.6
Yan Zhang,Wenjing Qin,Yanli Wang,XinXin Li,Changshun Gu,Mengyao Chen,Xiujie Guo,Hengchao Liu,Boxin Zhao
With the frequent occurrence of extreme climates, passive daytime radiant cooling (PDRC) and passive daytime radiant heating (PDRH) technologies are receiving more and more attention as green and sustainable ways to regulate temperature. Here we present a Janus composite porous fiber membrane (MXene@PVDF/TPU), prepared by controlling the ratio of two components, PVDF and TPU, in the electrospinning precursor solution, to regulate the optical, mechanical, and other properties of the fiber membrane. By spraying MXene on one side of the fiber membrane, we achieve radiative heating performance, while the side without MXene spraying exhibits radiative cooling performance. Switching between cooling and heating modes can be accomplished by simply flipping the composite fiber membrane. The cooling side of the fiber membrane has high solar reflectance (93.75 %) and mid-infrared emissivity (83.09 %), and can cool the ambient temperature up to 8.2 °C at noon. At the same time, the heating side of the fiber membrane has low reflectance (14.18 %) and mid-infrared emissivity (24.22 %), and can heat the environment up to 7.4 °C at noon. Besides, due to the electrical and thermal properties of MXene, the MXene@PVDF/TPU fiber membrane exhibits excellent Joule heating characteristics, which can effectively compensate for the PDRH. Switching between the modes of cooling and heating can be achieved by a simple flip of the composite fiber membrane, which is important to reduce carbon emissions to alleviate the energy crisis.
研究领域:
材料科学
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环境科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Huiyu Yang,Rong Chen,Xiaohua Cheng,Liangang Zhao,Hai Liu,Bo Deng,Zushun Xu,Chunli Gong
Passive Radiant Cooling and Heating are green and sustainable methods of radiant heat management without consuming additional energy. However, the absorption of sunlight and poor insulation of materials can reduce radiative cooling and also affect radiative heating performance. Herein, we have constructed porous hierarchical dual-mode silk nanofibrous aerogel (SNF) films with high mechanical toughness and stability using silk nanofibers/GO. The porous hierarchical structure endows the cooling side of the dual-mode film with low thermal conductivity (0.034 W·m −1 ·K −1 ) and high atmospheric window emissivity (92.7 %), with a sub-ambient cooling temperature of up to 9.6 °C under direct sunlight. The heating side of the dual-mode film has a high solar absorptivity (93.8 %) and a low atmospheric window emissivity (11.4 %). The covered air temperature was warmed by 25.5 °C in the simulated cold environment by the ice water bath. Importantly, both sides of the film are hydrophobically modified with FOTS to exhibit self-cleaning properties that protect the surface from contamination and facilitate long-term radiative cooling/heating. The films showed excellent cooling and heating properties even after two months of immersion in different pH solutions. This dual-mode aerogel film has great potential for outdoor applications and can be adapted to radiant heat management in various complex environments.
研究领域:
材料科学
·
能源与环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Applied Materials Today
·
2024
·
IF 7.2
Xiaolong Cao,Kai Yan,Hua Chen,Qunna Xu,Yan Zong,Xiaodan Sun,Xiao Li
Smart fabrics show a huge advantage in the field of flexible wearable electronics because of their superior hygienic properties. Here, a flexible wearable fabric for underwater sensing with both electromagnetic wave absorption (EWA) and passive radiation heating properties is fabricated by integrating polypyrrole (PPy), ferroferric oxide (Fe 3 O 4 ) nanospheres, and hydrophobic polyurethane (PDMS-PUF) onto the surface of the fabric. The multi-layer integrated structure allows the fabric sensor to be superhydrophobic (water contact angle is 154.5°) without much impact on its air permeability. At the same time, the conductive PPy network confers the fabric sensors with a rapid response rate (245/327 ms), effectively enabling long-term monitoring, especially during underwater sports in which the real-time altitude of the wearer can be monitored. Moreover, owing to the strong near-infrared absorption and ideal photothermal conversion performance of PPy, the fabric sensor achieves the maximum solar absorption rate (95.1 %) in the visible light region, and shows favorable radiative heating characteristics (10 min temperature rise of 23.5°C). Remarkably, the fabric is endowed with multiple loss mechanisms on the presence of PPy and Fe 3 O 4 , achieving prominent EWA properties (-29.1 dB at 12.16 GHz). Therefore, the smart fabric is an ideal candidate for smart swimsuits and health protection.
研究领域:
材料科学
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柔性电子
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健康保护
·
可穿戴设备
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Yubin Li,Guoliang Dai,Jie Fan,Hong Xiao
Visible light transparent and low infrared emission materials have great prospects in infrared camouflage, building energy efficiency, passive radiation heating and many other fields, yet their manufacture remains a formidable challenge. inspired by the overlap of branches and fallen leaves in winter, we applied bionic principles to build a conductive network combining AgNWs and MXene on a transparent PET substrate, and developed an optically transparent, infrared-low-emission flexible conductive film. The prepared MA 10/133 film has a visible light transmittance of not less than 71 %, a sheet resistance of 12.03Ω·sq −1 , and average emissivities of 0.37 and 0.18 in two infrared atmospheric windows of 3–5 μm and 8–14 μm, and demonstrates excellent visible transparency and infrared camouflage performance. In addition, in the field of personal thermal management, with superior passive radiant heating performance, MA 10/133 film covered simulated human skin is 4.5°C and 1.5°C higher than those covered by cotton and woolen fabrics. Stable and controllable Joule heating performance can be used as an effective complement to passive radiant heating performance, with a maximum saturation temperature of 74.7°C at a driving voltage of 5 V, which is sufficient to cope with colder outdoor environments. These properties make composite films promising candidates for military thermal camouflage, outdoor life jackets and smart, energy-efficient windows.
研究领域:
材料科学
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光电子学
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红外技术
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仿生学
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热管理
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柔性电子学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-9
·
IF 14.7
Tian Yucheng,Chen Yixiao,Wang Sai,Wang Xianfeng,Yu Jianyong,Zhang Shichao,Ding Bin
Incorporating passive heating structures into personal thermal management technologies could effectively mitigate the escalating energy crisis. However, current passive heating materials struggle to balance thickness and insulating capability, resulting in compromised comfort, space efficiency, and limited thermoregulatory performance. Here, a dual air-gelation strategy, is developed to directly synthesize ultrathin and self-sustainable heating metafabric with 3D dual-network structure during electrospinning. Controlling the interactions among polymer, solvent, and water enables the microphase separation of charged jets, while adjusting the distribution of carbon black nanoparticles within charged fluids to form fibrous networks composed of interlaced aerogel micro/nanofibers with heat storage capabilities. With a low thickness of 0.18 mm, the integrated metafabric exhibits exceptional thermal insulation performance (15.8 mW m −1 K −1 ), superhydrophobicity, enhanced mechanical properties, and high breathability while maintaining self-sustainable radiative heating ability (long-lasting warming of 8.8 °C). This strategy provides rich possibilities to develop advanced fibrous materials for smart textiles and thermal management.
研究领域:
材料科学
·
纳米技术
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纺织工程
·
热管理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）