CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Chenming Liu,Jing Lyu,Nan Shi,Qingqing Cheng,Zengwei Liu,Yubing Xiong,Xuetong Zhang
The control of thermal radiation features of objects for the purpose of infrared stealth has aroused extensive research interests in recent years, however, long-term and highly efficient infrared stealth for hot object under sunlight is still a giant challenge. Herein, a Kevlar nanofibrous aerogel-based 3-layer tandem cloak for long-term restraining of the thermal emission was proposed. The top layer was fabricated by magnetron sputtering silver (Ag) on the upper side of Kevlar nanofibrous aerogel film (Ag|KNA), demonstrating high thermal resistance (8.68 K·W −1 ), low infrared emissivity (0.12) and high optical reflectivity (0.87). The middle layer was realized by incorporating of phase change paraffin wax (PW) into KNA film (KNA/PW), showing phase change enthalpy of 162 J·g −1 . The bottom layer was fabricated by sputtering Ag on the lower patterned side of KNA film (PKNA|Ag), illustrating low infrared transmittance (close to zero), high thermal reflectivity (0.94) and high thermal resistance (10.42 K·W −1 ). Then flexible tandem cloak was constructed via stacking these aerogel-based top, middle and bottom layers in sequence, showing long-term (up to 12 h), high-efficiency (radiation temperature difference less than 1 °C) hiding of thermo-model targets under heating and sunshining simultaneously. This work provides a promising strategy for designing more practical tandem cloak for infrared stealth applications.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Jie Yu,Yuwei Wang,Cong Qi,Wenjie Zhang
Nanoparticles and metal foam are doped with the phase change materials (PCMs) to improve the utilization efficiency of solar energy during the day. In order to investigate the latent heat power generation properties of this hybrid PCM at night, A photothermal conversion experimental platform was built in this paper, the effects of metal foam pore density (PPI=0, 5, 10, 15) and nanoparticle concentrations ( ω = 0%, 0.5%, 0.8%, 1.0%) on the reverse temperature difference properties were investigated. Results indicates that PPI= 15 metal foam and ω = 1.0% nanoparticles can reduce the internal temperature of hybrid PCM by 35.92% and 20.93% respectively compared with pure paraffin. PPI= 15, 10, and 5 metal foam decreases the temperature difference, voltage, and power generation at most by 74.57%, 71.02%, and 74.54% compared with PPI= 0. Compared with ω = 0% nanoparticles, the temperature drop rates of ω = 1.0%, 0.8%, and 0.5% nanoparticles increase at most by 103.0%, 79.69% and 39.84% respectively. To a certain extent nanoparticles and metal foam are not conducive to reverse latent heat power generation although they are beneficial to photothermal performance. This research has reference and guiding significance for reverse latent heat power generation properties of PCMs doped with nanoparticles and metal foam at night.
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 21
·2300233
·
IF 13.3
Tian Li,Jinzhe Li,Zhengkan Xu,YingRui Tian,Jiatong Li,Jiani Du,Fanbin Meng
Nowadays, the rapidly development of advanced antidetection technology raises stringent requirements for microwave absorption materials (MAMs) to focus more attention on wider bandwidth, thinner thickness, and lower density. Adding magnetic medium to realize broadband absorption may usually result in the decline of service performance and accelerating corrosion of MAMs. Chiral MAMs can produce extra magnetic loss without adding magnetic medium due to the unique electromagnetic cross polarization effect. However, more efforts should be taken to furtherly promote efficient bandwidth of chiral MAMs and reveal attenuation mode and modulation method of chiral structure. Herein, a novel superhelical nano-microstructure based on chiral polyaniline and helical polypyrrole is successfully achieved via in situ polymerization strategy. The enhanced multiscale-chiral synergistic effect contributes to broaden effective absorption bandwidth, covering 8.6 GHz at the thickness of 3.6 mm, and the minimum reflection loss can reach −51.3 dB simultaneously. Besides, to further explain response modes and loss mechanism of superhelical nano-microstructures, the electromagnetic simulation and test analysis are applied together to reveal their synergistic enhancement attenuation mechanism. Taken together, this strategy gives a new thought of how to design, prepare, and optimize the hierarchical structure materials to achieving broadband and high-performance microwave absorption.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Adham AL-AKHALI,Kaixun NIE,Duoxun FANG,Zhengqiang TANG
Fabricating underwater superoleophobic surfaces is an advanced technique for controlling undesirable oil and wax adhesion on engineering structures and household appliances. This article presented a facile method based on the combination of laser ablation of stainless steel substrates followed by magnetron sputtering of a metallic tungsten target to fabricate superhydrophilic and underwater superoleophobic surfaces. The results showed that the laser-ablated stainless steel substrate without coatings exhibited hydrophilicity and underwater oleophobicity. However, its transition to superhydrophilicity and underwater superoleophobicity with a 0° water contact angle and higher than 156° underwater oil contact angles occurred after the deposition of a thin tungsten film followed by annealing at 300 °C. The prepared surface maintained its wetting behavior for more than 4 weeks, even in corrosive aqueous HCl and NaOH solutions. According to the data from SEM and XPS, this distinguished wetting behavior resulted from the presence of the regular microscale texture patterns, abundant hydroxyl content, and low carbon content on the tungsten layer after annealing at 300 °C. Thus, laser ablation combined with magnetron sputtering of tungsten demonstrated effective results in fabricating superhydrophilic and underwater superoleophobic surfaces that are independent of the initial wetting of the substrates.
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2023
·Vol. 25
·期 14
·2201885
·
IF 3.6
Yi-Ran Li,Ying-Ming Li,Wen-Juan Hu,De-Yi Wang
Shaped photothermal conversion energy-storage materials are urgently developed to deal with the energy crisis and environmental pollution, and widely applicated in the fields of solar-thermal power, new energy vehicle power battery, and so on, in which the serious electromagnetic radiation affects its normal use. Meanwhile, frequently used organic phase-change materials are easily flammable, which greatly threaten the safety of life and property. Therefore, it is urgent to design shaped photothermal conversion and energy-storage materials with high electromagnetic interference (EMI) shielding efficiency and good flame retardancy. Herein, 2D graphene oxide sheets are simultaneously reduced and foamed by hydrazine, and a multifunctional F-reduced graphene oxide (rGO)/paraffin composite is prepared by vacuum impregnation method. When incorporating 40 wt% of F-rGO, the photothermal-conversion efficiency reaches 81.6%, the latent heat rate only reduces by 22.4%, and the change of phase enthalpy for the composites only decreases by 9.5% and after 10 thermal cycles. In addition, its EMI shielding efficiency is as high as 74.6 dB. Compared with pure paraffin, its heat release capacity, peak heat release rate, and total heat release are reduced by 50.1%, 52.0%, and 43.0%, respectively, due to the tortuous path and catalytic carbonization of F-rGO.
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2023
·
IF 6.2
Hongyu Liu,Zhou Wang,Bingli Pan,Menghan Li,Saisai Huang,Joong Hee Lee,Nam Hoon Kim
A novel carbon felt/nitrogen-doped reduced graphene oxide/paraffin wax ternary skeleton (CF/N−RGO/PW) is developed to enhance the tribological performances of monomer casting nylon-6 (MCPA6). FE−SEM results confirm the successful formation of the three-dimensional (3D) CF/N−RGO/PW skeleton, where N−RGO sheets are decorated on carbon fibers. Most importantly, the flexuous N−RGO sheets can accommodate PW to provide sufficient lubricity for MCPA6, working as ponds to store PW. On the other hand, abundant cracks are found along carbon fibers, working as ditches to transport PW onto the rubbing surface. Thus, the ternary CF/N−RGO/PW 3D skeleton exhibits a pond and ditch structure for the efficient storage and transportation of PW. In comparison with the neat MCPA6, the friction coefficient and wear loss of MCPA6/CF/N−RGO/PW decline by (83 and 65) %, respectively. Theoretical calculations based on density functional theory support the efficient adsorption of PW onto N−RGO. Therefore, the as-prepared MCPA6/CF/N−RGO/PW composite herein provides a new reference to prepare polymer composites with advanced tribological performance on account of the novel strategy of the storage and transportation of lubricants.
✓ 已验证
产品关联
DOI
高影响因子
Gels
·
2023
·Vol. 9
·期 4
·317
·
IF 4.6
Linlin Xie,Xiaoxu Wu,Guichao Wang,Yury M. Shulga,Qiong Liu,Ming Li,Zhi Li
To address the leakage issue of paraffin phase-change materials in thermal management, a monolithic MTMS-based silica aerogel (MSA) is employed to encapsulate paraffin through a facile impregnation process. We find that the paraffin and MSA form a physical combination, with little interaction occurring between them. The prepared no-leakage paraffin/MSA composites have a density of 0.70 g/cm3and exhibit good mechanical properties and nice hydrophobicity, with a contact angle of 122°. Furthermore, the average latent heat of the paraffin/MSA composites is found to reach up to 209.3 J/g, about 85% of the pure paraffin’s latent heat, which is significantly larger than other paraffin/silica aerogel phase-change composite materials. The thermal conductivity of the paraffin/MSA remains almost the same as that of the pure paraffin (~250 mW/m/K), without any heat transfer interference from the MSA skeletons. All these results indicate that MSA can effectively serve as a carrier material for encapsulating paraffin, which is beneficial for expanding the applications of MSAs in thermal management and energy storage.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Linfeng Li,Yaoqi Huang,Wenbin Li,Liyi Zou,Xi Wu,Yuanyuan Li,Xiaomin Cheng
Microencapsulated phase change materials (MEPCMs) have different thermal conductivity requirements under various application conditions. Organic-shell MEPCMs currently dominate the microcapsule due to their easy availability. The aim of this paper is to regulate the thermal properties, especially the thermal conductivity, of organic-shell microcapsules. Herein, with the precision and uniformity of atomic layer deposition (ALD) coating, the thickness of ZnO coating is controlled on the surface of paraffin @ polymethyl methacrylate (PMMA) to realize the regulation of thermal properties of MEPCMs. The experimental results illustrate that the introduction of ALD ZnO shell abates the phase transition enthalpy of MEPCM, but it realizes the optimization of thermal stability and phase transition reversibility for MEPCMs, which is confirmed by the mechanical test results of microcapsules. Furthermore, it is particularly worth mentioning that the thermal conductivity of MEPCM can be adjusted from 0.16 to 1.99 W m −1 K −1 within the ALD cycle range given in this research. The equivalent thermal conductivity of MEPCM was verified by calculation, and the relationship between ALD treatment and thermal conductivity was obtained. This research provides a strategy for accurately regulating the thermal conductivity of phase change microcapsules, breaking through the bottleneck in the application of microcapsules.
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2023
·Vol. 13
·期 22
·2300325
·
IF 27.8
Zhen Zhang,Tianping Wang,Weiwen Wang,Xiangnan Wang,Xianglin Luo,Chong Cheng,Xikui Liu
Metallophthalocyanines (MPcs) hold great promise in the electrochemical reduction of oxygen; however, their practical applications in energy storage and conversion are still limited by their low stability and poor water oxidation activity. Herein, a novel stable 2D imide-linked metalphthalocyanine framework (denoted as FePc-PI) is reported, that has atomically dispersed Fe-N 4 sites deposited on the KB substrate via in situ growth, followed by incorporation of ultrafine nickel oxide nanoparticles (NiO x @FePc-PI/KB) to induce bifunctional electrocatalytic activities for the oxygen reduction reaction and oxygen evolution reaction. Benefitting from the robust aromatic backbone, the engineered catalytic centers, and the unique electronic structures owing to the interaction between the Fe-N 4 sites and NiO x species, the newly developed NiO x @FePc-PI/KB catalyst exhibits excellent reversible oxygen bifunctional activity ( E 1/2 = 0.926 V, η 10 = 285 mV), delivering a record-low overpotential difference (Δ E ) of 0.59 V, which far exceeds the noble-metal-based Pt/C+RuO 2 benchmark (Δ E = 0.77 V) and represents the highest level for reported bifunctional electrocatalysts. Furthermore, the rechargeable aqueous Zn-air batteries assembled with the NiO x @FePc-PI/KB catalyst deliver a high peak power density of 232.9 mW cm −2 and long-term cycling durability over 1400 cycles. Flexible all-solid-state Zn-air batteries exhibit stable cycling at various flat/bent/flat states, thus demonstrating their excellent prospects in realistic implementations.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 4
·1-13
·
IF 2.8
Du Qingyuan,Li Chenglin,Sun Jingyao,Zhang Hao,Zhang Xiaowen,Liu Changhao,Wu Daming,He Jianyun,Guo Zhanhu
Phase change materials (PCMs) have been widely used in passive thermal management and energy storage due to their high latent heat capacity. However, the low thermal conductivity and leakage problems of PCMs are two bottlenecks for its application in the field of heat-related applications. Although many present studies can tackle one or two of these problems by preparing phase change composites (PCCs), it is still a challenge to achieve high performance PCCs with excellent thermal, mechanical, and phase change properties simultaneously. In this work, we report a spatial confining forced network assembly (SCFNA) method to efficiently prepare the thermal conductive, flexible, leak-proof hexagonal boron nitride/paraffin wax/ polydimethylsiloxane (hBN/PW/PDMS) PCCs by constructing hBN and PW thermal conductive networks as the functional matrix of PCCs. In the hBN/PW/PDMS PCCs, PW is served as the PCM, a dense hBN network provides the high thermal conductivity, and the mechanical properties and shape stability are provided by PDMS. The hBN/PW/PDMS PCCs as thermal interface materials reduce the LED chips surface temperature and exhibit efficient and reliable thermal management performance. Our work provides an efficient and economical method for the preparation of PCCs with outstanding thermal management capability.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Jiahao Sun,Xiaoxiao Huang,Yuhao Liu,Kaili Zhang,Yuefeng Yan,Yanan Liu,Xu Yan
Carbon fiber (CF) is a research focus due to its high performance in aviation, aerospace, and defense. However, its inherent high electrical conductivity makes it impedance mismatched. Herein, a material was prepared by grafting and coating SiO 2 on short-cut carbon fiber (SCCF). The structure of SiO 2 layer coated on the surface of SCCF brings about a stronger synergy of multiple loss mechanisms such as interface polarization and dipole polarization. It is shown that with the increase of SiO 2 content, it has a significant optimizing effect on the impedance matching of SiO 2 /SCCF composites, and the SiO 2 layer structure increases the loss mechanisms of interface and dipole polarization. At 2 vol% filling ratio and 6.35 GHz frequency, corresponding reflection loss (RL) value was −29.3 dB. Meanwhile, the SiO 2 /SCCF composite achieves an ultra-broadband electromagnetic wave absorption performance with an effective absorption bandwidth (EAB) of 12.3 GH. Therefore, this work provides a strategy for designing efficient and lightweight CF-based composites with electromagnetic wave absorption performance.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Qi Chen,Xing Liu,Tingting Wang,Xiaogang Su,Meng Liu,Somboon Chaemchuen,Francis Verpoort
Exploring a simple, rapid, solvent-free synthetic method for mass production of cheap, broadband microwave absorbers remains the main challenge. Here, a mild solvent-free procedure is reported to synthesize zinc oxide nanoparticles (ZnO NPs) embedded in porous carbon derived from mixing sucrose and zinc nitrate hexahydrate. The characteristic morphology and the ZnO NPs distribution in these composites were tuned using the different raw materials proportions. The mesoporous structure of porous carbon benefits the compositional advantages between carbon foam and ZnO NPs. The optimal synthesized ZnO/C-2 carbon material demonstrates the strongest absorption of –41.7 dB with a frequency of 14.5 GHz at a thin thickness of 2 mm, and its widest effective absorption is close to 6 GHz (12.2–17.8 GHz). This work produces a feasible route for the sensible design of other effective microwave absorbers for large-scale production.
✓ 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）