COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2022
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IF 9.463
Fei Xue,Chen-hui Huang,Xiao-dong Qi,Jing-hui Yang,Cheng-shou Zhao,Yan-zhou Lei,Yong Wang
Solid-liquid organic phase change materials (OPCMs) appeal tremendous attention in thermal energy storage and management for their various merits. However, low thermal conductivity (TC), inferior encapsulation ability and fatal fire hazard significantly impair the application accessibility of the OPCMs. This work designed and fabricated a new three-dimensional (3D) melamine foam (MF)/phosphorous cellulose (PC)/graphite nanoplatelets (GNPs) (MF/PC/GNP) network to compound with the OPCMs with all these problems simultaneously sovled. With the assistance of MF-modified ice-templated method and PC, the GNPs form a dense network to efficiently enhance the TC of the composite PCMs to 1.08 W/(m·K) at a relatively low content of 2.39 wt%, while the electric conductivity (EC) reaches 0.690 S/cm. In addition, the peak of heat release rate (PHRR) of the composite PCMs decreases from 725.62 kW/m 2 of pure PEG to 624.04 kW/m 2 . Besides, the MF/PC/GNP network also endows the composite PCMs with multiple energy-transition aiblities.
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高影响因子
Journal of Materials Chemistry A
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2020
·Vol. 8
·期 5
·2701-2711
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IF 11.301
Sen Meng,Xing Zhao,Chun-Yan Tang,Peng Yu,Rui-Ying Bao,Zheng-Ying Liu,Ming-Bo Yang,Wei Yang
Interfacial solar steam generation has been proved to be effective for desalination and water purification applications and a large number of smartly designed structures have been reported to reduce the heat conduction loss into bulk water by introducing thermally insulating porous foams. Actually, directly using air as the thermal insulation layer should be one of the most efficient ways to reduce the heat loss into bulk water. To this end, we present a bridge-arched hollow and self-floating integrative solar absorber/water evaporator prepared by a one-step hydrothermal reaction. The fully integrative water evaporator can achieve ∼92.9% water evaporation efficiency and 1.476 kg m−2 h−1 water evaporation rate under just 1 sun illumination. Such a high efficiency is caused by the unique bridge-arched raised upper surface, hollow interior, and tailored bilayer structure consisting of hydrophilic porous melamine foam for water transportation and a reduced graphene oxide layer for photothermal conversion. These features not only provide broadband solar absorption (∼95%), efficient light-to-heat conversion and a high water evaporation rate, but also suppress the heat loss at the same time. Owing to the simplicity of fabrication and recyclability, this novel composite structure is an ideal material for commercial, portable solar thermal conversion applications to obtain clean water via seawater desalination and wastewater purification.
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高影响因子
Journal of Energy Storage
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2024
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IF 8.9
Jianfeng Hu,Shenghua Xu,Ye Wang,Xin Lai,Zhengbin Xia,Zhengguo Zhang,Peng Xie,Sixing Zhang
Organic phase change materials pose a risk of flammability in practical applications, and composite materials prepared after encapsulation also face the problem of high thermal resistance when in contact with equipment. In this study, a new type of flexible composite phase change material with flame retardancy and insulation was prepared. Melamine foam (MF) was also physically modified with flexible long-chain polymer polyvinyl alcohol (PVA) to improve tensile property, leading to the preparation of one porous material, denoted as PMF. Subsequently, ammonium polyphosphate (APP), an intumescent flame retardant, was incorporated to formulate the composite phase change material APP/PEG@PMF. The mechanical properties of melamine foam were assessed using the universal material testing machine both before and after modification and the optimal amount of PVA, determined to be 15 %, was selected. The experimental results show that the composite materials have a high latent heat (both higher than 160 J/g). After 100 heating and cooling cycles, the material demonstrates excellent shape stability, proficiently preventing PEG leakage during phase transformation. Additionally, it exhibits prominent shape memory attributes, thereby reducing the contact thermal resistance when integrated within equipment. The oxygen index meter and vertical combustion test show that when the APP content is higher than 10 %, the oxygen index of the composite material reaches 22.6 %, while the thermal conductivity decreases to 0.13 W/(m·K). It not only improves the safety of PCMs in practical application scenarios, but also broadens the potential application spectrum of this composite material within the thermal insulation domain.
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高影响因子
DESALINATION
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2026
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IF 9.8
Chen Tan,Jing Miao,Kanghui Liu,Aichun Zhao,Xinlong Guo,Linjie Qin
Developing cost-effective adsorbents capable of treating multipollutant wastewater under fluctuating pH conditions remains a major challenge for layered double hydroxide (LDH)-based materials. Herein, we report a La-doped MgAl-borate LDH/Nitrogen-doped carbon hybrid (LaMgAl-BLDH/NC) constructed through a C-O-M interfacial coupling, in which hydroxyl-rich N-doped carbon reacts with the metal‑oxygen layers of LaMgAl-BLDH to form robust covalent C-O-M linkages. This bonding-directed assembly produces a chemically durable and strongly integrated 3D porous network with enhanced charge heterogeneity and improved resistance to acidic or alkaline corrosion. Benefiting from this strengthened interfacial coupling and the synergistic effects of La incorporation, the LaMgAl-BLDH/NC composite exhibits high removal capacities toward structurally diverse pollutants, achieving maximum capacities of 995.20 mg/g for Congo red, 3020.19 mg/g for malachite green, and 151.34 mg/g for phosphate. Notably, compare with conventional LDHs that undergo structural degradation in acidic or alkaline environments, the C-O-M reinforced hybrid maintains excellent performance over a broad pH range of 4–10. The maximum adsorption capacities of the adsorbent for Congo red, malachite green and phosphate at pH 2, 4 and 12 correspond to 79.65%, 87.32% and 58.83% of those obtained at their respective optimal pH values. Mechanistic analysis reveals that electrostatic interaction, ion exchange, π-π stacking, pore filling jointly govern the removal process. Optimization via Box-Behnken response surface methodology further enhances removal efficiency by identifying favorable synthesis and operational conditions. This work establishes a generalizable, low-cost C-O-M bonding strategy for pH-tolerant LDH/carbon hybrids, enabling efficient remediation of multipollutant industrial wastewater.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Le Cheng,Jiachun Feng
With the progress of intelligent electronic equipment, flexible and wearable strain sensors are being widely used in various applications such as electronic skins and smart robot. In this work, we proposed a facile method for the preparation of stretchable strain sensors as well as compressible strain sensors by using commercially available melamine form (MF). Firstly, MF was coated with reduced graphene oxide (rGO) to construct conductive networks via layer-by-layer assembly of polyethyleneimine and graphene oxide followed by chemical reduction. Thermoplastic elastomer poly (styrene- b -ethylene-butylene- b -styrene) (SEBS) was then infused into the MF@rGO scaffolds through solution absorption method. By adjusting the concentration of SEBS solution used, stretchable and compressible strain sensors were fabricated and both of them exhibited excellent mechanical properties, sensitive responsiveness and electromechanical durability. The deformation capacity of these two types of sensors could reach as high as 50% strain and the maximum gauge factors of stretchable and compressible strain sensors was 2.43 and 1.74, respectively. Stable signals during at least 1000 cycles for both stretchable and compressible strain sensors were well maintained. The potential sensing application of real-time monitoring of human motions was also demonstrated.
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高影响因子
危险品化学品经营许可证（带存储）