Nano-Micro Letters
·
2024
·Vol. 16
·期 1
·1-16
·
IF 31.6
Lei Leqi,Meng Shuo,Si Yifan,Shi Shuo,Wu Hanbai,Yang Jieqiong,Hu Jinlian
Engineering MXene into electrospun nanofibers can effectively enhance its thermal emissivity and conductance, and the unidirectional water transport of the wettability-gradient-induced-diode (WGID) membrane displayed diode-like properties with wettability gradient by tailoring the water contact angle of each single layer.
The WGID membrane could achieve a cooling temperature of 1.5 °C in the “dry” state, and 7.1 °C in the “wet” state, with high emissivity of 96.40% in the MIR range, superior thermal conductivity of 0.3349 W m −1 K −1 .
Zero-energy-consumption for personal cooling management via multiple heat dissipation pathways, including thermal radiation, conduction, and evaporation.
研究领域:
材料科学
·
热管理工程
·
表面科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Device
·
2025
·
IF 8
Xueqing Yang,Junwei Liu,Zhihua Zhou,Yan Liang,Junjiang Wu,Saimeng Li,Dexia Han,Yahui Du,Zhiling Guo,Yu Chen,Long Ye,Jinyue Yan
Summary The efficiency and longevity of photovoltaics (PV) are sensitive to high operation temperatures, while their operational reliability can be compromised under winter conditions. Evaporative passive cooling can help control the temperature of PV by using hydrogels as water-rich materials. However, the lack of clear design principles and the uncertainty in ensuring the winter performance of PV in mid-to-high-latitude regions remain critical gaps. In this work, we establish the design principles for hydrogels with efficient and sustained evaporative cooling capabilities and demonstrate their application in enhancing PV performance across all seasons. The developed polyacrylamide (PAM) hydrogels can deliver a maximum temperature drop of ∼27°C and a peak cooling power of 612 W/m 2 for PV heat dissipation. The developed hydrogels can alleviate snow accumulation and accelerate snow melting of PV panels in winter via vapor adsorption.
研究领域:
能源工程
·
材料科学
·
热力学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Sustainability
·
2024
·
IF 7.1
Yixuan Han,Tong Lyu,Yanpeng Wang,Zhiwei Fu,Deliang Li,Ruonan Liu,He Liu,Ziya Gao,Huilin Yuan,Ye Tian
Improving thermoelectric generators (TEGs) performance remains challenging in the context of energy crisis and thermal-pollution. Here, we present a strategy for thermal management and performance enhancement of TEGs by sustainable evaporative cooling utilizing highly hygroscopic and adhesive ionogels (PIGs). Rational swelling and poly-[2-(Methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide (PDMAPS) chains with group interactions prevent lithium chloride (LiCl) and 1-ethyl-3-methylimidazolium acetate ([EMIM][Ac]) leakage, while carbon nanotubes (CNTs) and MIL-101(Cr) optimize the evaporative cooling of PIGs. PIGs possess high sorption (252.72% at 25 °C, 90% RH for 12 h) and steady sorption-desorption kinetics. Meanwhile, PIGs exhibit high adhesion (130.89 N m −1 ) on TEGs. The evaporative cooling of PIGs enhances the temperature difference of TEGs. The potential of PIG-TEG is increased by three times at heat source temperatures of 50–80 °C, and the output power density stabilizes at ∼706.25 mW m −2 after heating at 50 °C for 1 h. Moreover, the PIG-TEG maintains stable output enhancement for prolonged time (over 24 h). Additionally, we integrate PIG-TEGs for the durable power supply of devices and design a movable model car, which utilizes waste heat for self-powering. PIGs realize effective thermoelectric output enhancement of TEGs, and provide ideas in clean energy conversion, wearable devices, and mobile power.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2024
·
IF 9
Haoran Li,Jiahui Ma,Wei Yan,Jingrui Lan,Wenpeng Hong
The lifetime and photovoltaic conversion efficiency of the solar cell will decline as the temperature rises. Herein, a versatile hydrogel allowing atmospheric water harvesting and evaporative cooling is introduced to passively reduce the working temperature of the solar cell. As a flexible substrate, the lithium-rich and highly absorbent polyacrylamide hydrogel is employed to satisfy these specifications. Preferentially, the water-saturated hydrogel, which is bonded to the backside of the solar cell, collects the waste heat produced by the cell and dissipates it into the atmosphere by water evaporation. Importantly, the hydrogel naturally gathers atmospheric vapor at night or on overcast days to revive its cooling ability. This configuration endows the PV cell with a cooling flux of up to 529 W m −2 and thus reduces the working temperature of a polycrystalline silicon cell by 26 °C at 1 sun (=1 kW m −2 ) illumination. More importantly, the hydrogel arrangement supports 6.2 % and 17 % improvements in average open-circuit and maximum power output (or photovoltaic efficiency), respectively. This is devoid of limits on access to liquid water resources, making it a potential option for efficient and sustainable solar cell power generation.
研究领域:
材料科学
·
能源技术
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2021
·
IF 4.156
Fangjia Yan,Xiaojuan Zhang,Edouard Asselin,Dongping Duan,Zhibao Li
Two interconnected reactors were used to produce high quality SrCO 3 by leaching celestite in NaHCO 3 solution at elevated temperature of 363.15 K. This new method avoids undesirable polluting by-products generated in the widely used black ash process. The precipitation kinetics of celestite (SrSO 4 ) leaching in NaHCO 3 at various temperatures was investigated with a view to industrial application. It was found that high temperature significantly enhanced the leaching conversion while initially concentrated Na 2 SO 4 in leaching solution has limited influence on the leaching reaction. The new process overcomes the key disadvantage of high energy consumption during sodium sulfate recovery that is inherent in the soda ash process. Having studied the effects of NaHCO 3 concentration and temperature on the leaching reaction, a shrinking core model was established with an apparent activation energy of E a = 86.6 kJ/Mol. The rate-determining step was the diffusion of ions through the product layer. Saleable Na 2 SO 4 products were successfully obtained via evaporative cooling crystallisation
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Zimeng Zhao,Haoyun Li,Yangyang Peng,Jinlian Hu,Fengxin Sun
Smart clothing with adaptive personal thermal management functionality is highly desirable for wearing comfort and energy efficiency. However, due to the lack of common materials that can fabricate dynamic thermoregulation fabrics, translating the existing technologies to commercial applications remains challenging. Herein, leveraging an industrial textile manufacturing approach, a hierarchically programmed meta-louver fabric with switchable modes for both hot and cold is developed. The efficacy of adaptive pore channels by manipulating the orientation of chiral knit loops to regulate water evaporation, as well as thermal convection and radiation, is experimentally demonstrated. In sharp contrast to current pore-actuated smart textiles, the designed meta-louver fabric gains its adaptive thermoregulation capacity directly from the multiscale textile structure engineering, ranging from the single-helical-fiber enabled yarn actuators to pre-tension induced chiral-helical knit loops. This strategy is shown to be also effective for other fiber materials, such as cotton, and thus provides a universal paradigm for a new family of metamaterials by engineering the interconnection of multiscale structures.
研究领域:
材料科学
·
纺织工程
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
Nano-Micro Letters
·
2025
·Vol. 17
·期 1
·1-21
·
IF 36.3
Dong Xiuli,Chan Kit-Ying,Yin Xuemin,Zhang Yu,Zhao Xiaomeng,Yang Yunfei,Wang Zhenyu,Shen Xi
Hygroscopic hydrogel is a promising evaporative-cooling material for high-power passive daytime cooling with water self-regeneration. However, undesired solar and environmental heating makes it a challenge to maintain sub-ambient daytime cooling. While different strategies have been developed to mitigate heat gains, they inevitably sacrifice the evaporation and water regeneration due to highly coupled thermal and vapor transport. Here, an anisotropic synergistically performed insulation-radiation-evaporation (ASPIRE) cooler is developed by leveraging a dual-alignment structure both internal and external to the hydrogel for coordinated thermal and water transport. The ASPIRE cooler achieves an impressive average sub-ambient cooling temperature of ~ 8.2 °C and a remarkable peak cooling power of 311 W m −2 under direct sunlight. Further examining the cooling mechanism reveals that the ASPIRE cooler reduces the solar and environmental heat gains without comprising the evaporation. Moreover, self-sustained multi-day cooling is possible with water self-regeneration at night under both clear and cloudy days. The synergistic design provides new insights toward high-power, sustainable, and all-weather passive cooling applications.
研究领域:
材料科学
·
能源技术
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small Science
·
2024
·Vol. 4
·期 3
·2300237
·
IF 11.1
Zuoxin Hu,Yu Qiu,Jicheng Zhou,Qing Li
Radiative cooling and evaporative cooling are sustainable cooling techniques without additional energy input. However, radiative cooling lacks dynamic cooling ability, while evaporative cooling demands external water replenishment, hindering their applications. Herein, a smart radiative/evaporative cooling bilayer combining a polydimethylsiloxane (PDMS) upper layer with a hydrogel lower layer is presented for efficient all-day dynamic passive cooling. The PDMS layer with high solar reflectivity (0.930) and emissivity (0.952) provides excellent all-day radiative cooling and protects the hydrogel from solar exposure, while the hydrogel layer demonstrates remarkable water evaporation and absorption, achieving dynamic evaporative cooling. Thus, the synergy of the two layers significantly enhances the overall cooling performance. Specifically, the bilayer can achieve the peak cooling power values of 424.4 and 650.6 W m −2 as well as the maximum subambient cooling temperatures of 10.4 and 3.7 °C during sunny and cloudy mid-days, respectively. Moreover, the bilayer obtains 3.2 °C warmer temperature compared with the PDMS alone during cold nighttime, while the two structures exhibit comparable cooling performance during hot nighttime, indicating the self-adaptive cooling property of the bilayer. In addition, the bilayer can achieve good cooling performance even under continuous cloudy days, offering a promising strategy for efficient all-day dynamic passive cooling.
研究领域:
材料科学
·
能源工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2021
·Vol. 306
·期 3
·2000696
·
IF 4.367
Xiaoyan Li,Muhammad Javed,Ming Luo,Zaisheng Cai,Bi Xu
Fabrics which can keep people cool in a hot climate have attracted considerable attention in recent years. Among various cooling strategies, fabric cooling by water evaporation is proved to be very safe, simple and sustainable. Here, a tri-layer laminated fabric (TLF) inspired by perspiration is designed to realize passive cooling of human body. An interlayer fabric which is coated with crosslinked sodium polyacrylate can absorb and store a large amount of water. A moisture-absorbing and quick-drying fabric is used as the outer layer while a waterproof breathable fabric is used on the inside of the laminate in contact with skin. The prepared TLF shows decent evaporative cooling performance under dry heat conditions. The water absorbency of TLF is about 400% higher than that of pristine cotton after 1 h soaking in water. Under a 1 sun irradiation (1000 W m −2 ), the indoor temperature of a simulated room can be reduced by ≈5–7 °C compared with the other without a cooling system. Meanwhile, the evaporative cooling effect can be maintained up to 5 h. This cooling fabric shows broad application prospects in the fields of thermal cooling to human and buildings.
研究领域:
材料科学
·
纺织工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yong Li,Wenjia Huang,Jinlin Chen,Shuangfei Xiang,Shujun Zhao,Feiya Fu,Xiangdong Liu
The Janus fabrics offer potential advantages in moisture management for a comfortable microclimate between our bodies and the environment, but challenges remain in achieving desirable unidirectional sweat transfer and integrating wearing comfort, cost-effectiveness, and fabrication scalability. Here, cotton fabrics are modified on their opposing surfaces to create a Janus structure with dual discrepancies in surface energy and fabric porosity, resulting in improved water transport capability and a well-balanced combination of the mentioned properties. The hydrophobic surface was created by covalently grafting a block copolymer, poly(acrylic acid)- b -poly(lauryl methacrylate), onto one side of a cotton fabric using a “mist polymerization” technique. Porosity differentiation was then achieved by electrospinning silk fibroin (SF) onto the opposite side. The resulting dual-discrepancy in the fabric synergistically enhances its unidirectional transport capability, achieving an outstanding water evaporation rate of 3.0 kg m −2 in 6 h, and at least 2 °C evaporative cooling compared with other conventional fabrics such as cotton and PET. This study demonstrates valuable insights into the development of smart textiles that provide a comfortable microclimate for the human body.
研究领域:
材料科学
·
纺织工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wansheng Li,Yu Feng,Taisen Yan,Yongqiang Zhang,Xingguo Wei,Qinghang Lv,Jiang Qin
With the increasing power of electronic devices, thermal management has become crucial for their operational efficiency and lifespan. In this work, we have demonstrated a sorption-based thermal management strategy enabled by hygroscopic hydrogel. The polyacrylamide (PAM) hydrogel impregnated with LiCl (PAM-LiCl) was attached to a silicon wafer. And Pt metal circuits were coated to the silicon wafer to measure the temperature variations under different heat flux densities. The results show that the hydrogel can effectively reduce the surface temperature. At a heating power of 0.3 W/cm 2 , the temperature control duration reached 30 min, with an average effective heat transfer coefficient of 65.5 W/(m 2 ·K) and an effective heat storage density of 171 J/cm 2 . Additionally, we developed and validated a multiphysics model considering desorption and vapor diffusion within the hydrogel. Numerical results indicate that during the desorption cooling process, the surface heat transfer resistance and the internal diffusion resistance play a dominant role. Additionally, we analyzed the effects of material properties, structure parameters, and operating conditions on the thermal management performance. This study helps to understand the key points of sorption-based thermal management technology and guide the design and optimization of sorption-based thermal management system.
研究领域:
材料科学
·
热能工程
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xin Shen,Feifei Wang,Zhiping Mao,Hong Xu,Bijia Wang,Xiaofeng Sui,Xueling Feng
Innovative thermal management materials are in high demand for construction of energy-efficient systems. Evaporative cooling hydrogel has been extensively investigated in passive building cooling owing to its cost-effective and environmental-friendly characteristics. However, poor mechanical properties and shape instability severely restrict its scope and lifespan. In this study, we report an ingenious and effective thermal management material, the PCMs organohydrogel, with advanced thermal performance and outstanding shape and thermal stability, which integrates the advantages of evaporative cooling performance of water and latent heat storage capability of eicosane. The biphasic PCMs organohydrogel was synthesized by the CAA-HRP-H 2 O 2 ternary enzyme-mediated polymerization of the eicosane-in-water emulsion stabilized by the cellulose acetoacetate (CAA). CAA played important roles in the system not only as the emulsifier but also as the polymerization mediator. The encapsulation of PCMs by the organohydrogel provides the composites outstanding thermal stability as the decomposition temperature of the eicosane was elevated by 101 °C. Furthermore, the PCMs organohydrogel exhibits excellent thermomechanical performance and shape memory effect because of the wrapped phase-transition micro-inclusions and the interfacial tension of heterophases. The application of the PCMs organohydrogel as passive cooling material on the model house roof was demonstrated. The cooling effectiveness of the PCMs organohydrogel was investigated, indicating that the biphasic PCMs organohydrogel is expected to be an efficient and reliable passive thermal management material in building thermoregulations .
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）