SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Jun Li,Long-Fei Ren,Jiahui Shao,Yonghui Tu,Zhongbao Ma,Yuanxin Lin,Yiliang He
Electrospinning is a notable technique to prepare nanofibrous membranes with remarkable features required for membrane distillation (MD). However, hydrophobic membrane fabricated by electrospinning alone could hardly ensure a high flux. In this study, triple layer membrane that is composed of a PVDF-PTFE hydrophobic layer, a PET support layer, and a chitosan-polyethylene oxide (CS-PEO) hydrophilic layer, was fabricated by electrospinning. Firstly, the PVDF-PTFE and CS-PEO layers were optimized, whose contact angles and thicknesses were 144.3°, 55 μm and 20°, 75 μm, respectively. Then, the triple layer membrane (TL-M), dual layer membrane without hydrophilic layer (DL-M) were fabricated and tested in a DCMD process using 3.5 wt% NaCl as the feed to illustrate the effect of hydrophilic layer. The triple layer composite membrane (average flux: 19 kg/m −2 h −1 , rejection rate: 99.92%) showed better performance in comparison to the dual-layer membrane (average flux: 15 kg/m −2 h −1 , rejection rate: 99.88%). In addition, the driving forces of TL-M (from 14.34 to 14.16 kPa) and DL-M (from 13.26 to 12.88 kPa) were calculated. Results suggested the incorporation of hydrophilic layer could increase the driving force, and largely enhance the membrane flux which could ensure the triple layer membrane possesses a good potential for DCMD application.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
GLOBAL CHALLENGES
·
2021
·Vol. 5
·期 4
·2000092
·
IF 3.847
Zhenzhen Guo,You Xu,Fang Yu,Jiacheng Yin,Xianbao Wang
Interfacial water evaporation technology by using solar energy provides one of the promising pathways for freshwater shortage management. However, current research mainly focuses on the improvement of evaporation efficiency by macro or microregulations, ignoring the steam temperature, which is a manifestation of the quality of water. Herein not only is a high-rate solar evaporation achieved but also steam temperature is enhanced by a simple three-tier (wet absorber–air gap–dry absorber) device. In a routine interfacial evaporation test, the evaporator achieves a stable evaporation rate up to 2.15 kg m −2 h −1 under one sun, demonstrating a competitive evaporation rate compared with other reports. With the three-tier device, the steam temperature can increase 33.7%, 41.13%, and 47% without dry absorber under one sun, two sun, and three sun illumination, respectively. At the same time, the steam temperature can be as high as 95.5 °C under three sun intensities. This work provides the possibility of using a simple three-tier device for high-temperature steam generation without extra energy input, which contributes to an idea for future research on the production high-quality water.
研究领域:
可再生能源
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环境科学
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材料科学
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水资源管理
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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
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纺织工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
Zhuo Chen,Xiufang Cui,Yongchao Fang,Chao Yan,Rui Wang,Yongzhi Jing,Xinhe Wang,Guo Jin,Xiang Wang
Gd 2 O 3 and Sm 2 O 3 co-doped LZ ceramic ((La 0.5 Gd 0.25 Sm 0.25 ) 2 Zr 2 O 7 /YSZ) are designed and prepared by atmospheric plasma spraying (APS). It is the aim of this study to investigate the similarities and differences between co-doped sample and mono-doped samples, (La 0.5 Gd 0.5 ) 2 Zr 2 O 7 /YSZ and (La 0.5 Sm 0.5 ) 2 Zr 2 O 7 /YSZ on hot corrosion behaviors exposed to Na 2 SO 4 + V 2 O 5 molten salts . Thermodynamic calculations are used to predict the hot corrosion mechanism before experiments. Characterization and hot corrosion behavior are analyzed using X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM). Results indicate that the main hot corrosion products are composed of rare-earth vanadates ((La, Gd)VO 4 , (La, Sm)VO 4 and (La, Gd, Sm)VO 4 , respectively) and ZrO 2 . After 10 h of corrosion, the reaction layer evolves into trilayered structure containing Zr-rich layer, V-rich layer and mixed-layer. The formation mechanism is discussed in detail. The co-doped sample exhibits excellent degradation resistance, which can be attributed to the higher entropy value. The formation of the particular trilayered structure occurs earlier in the co-doped sample, which also provides a role in reducing the degradation rate of ceramics.
研究领域:
材料科学
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表面工程
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 22
·19578-19587
·
IF 2.324
Liu Chuanmei,Xu Jiangtao,Liu Zhengqin,Ning Xin,Jiang Shouxiang,Miao Dagang
In this study Ti/Ag/Ti tri-layer and Ti–Ag alloy films were deposited on the surfaces of polyethylene terephthalate (PET) fabrics by multi-target magnetron sputtering system to fabricate highly electro-conductive textiles. Before sputtering, the fabric was treated by polyacrylic acid ester (PA) to form a continuous surface on the surface of PET fabric by padding method. The as-fabricated fabrics were characterized by scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectrometer. And the physical properties of the coated fabrics were evaluated by electrical conductivity, contact angle (CA), flexibility and adhesion. At last, a simple electric circuit was made with the as-treated fabric to evaluate the electrical property and explore its application further. The results of the study revealed that pretreatment with PA could form a continuous film on the surface of PET fabric. The PA-coated PET fabric with Ti/Ag/Ti fabric exhibited excellent electrical property whose electrical resistivity was only 5.1 × 10 −7 Ω m, CA of 137°. The PA-coated PET fabric with Ti–Ag alloy film exhibited a rather lower electrical resistivity of 3.4 × 10 −7 Ω m, CA of about 130°. Moreover, the samples retain ideal flexibility and adhesion. Therefore this study can broaden the application area of magnetron sputtering on discontinuous surface to fabricate electrical conductive fabric. And due to the excellent electro-conductivity, this kind of fabric will be a promising material for smart textiles.
研究领域:
材料科学
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纺织工程
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表面工程
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2018
·
IF 2.88
Jian Zhu,Zai-jie Xu,Guo-jun Weng,Jing Zhao,Jian-jun Li,Jun-wu Zhao
In this report, Ag-dielectric-Au three-layered nanoshells with controlled inner core size were synthesized. The fluorescence emission of the rhodamine 6G (R6G) could be quenched by the three-layered nanoshells distinctly. What's more, the fluorescence quenching efficiency could be further improved by tuning the etching of inner Ag nanosphere . The maximum fluorescence quenching efficiency is obtained when the separate layer just appears between the inner Ag core and the outer Au shell. Whereas the fluorescence quenching efficiency is weakened when no gaps take place around the inner Ag core or the separate layer is too thick and greater than 13 nm. The fluorescence quenching properties of the Ag-dielectric-Au three-layered nanoshells with different initial sizes of the Ag nanoparticles are also studied. The maximum fluorescence quenching efficiency is obtained when the three-layered nanoshells are synthesized based on the Ag nanoparticles with 60 nm, which is better than others two sizes (42 and 79 nm). Thus we believe that the size of initial Ag nanospheres also greatly affects the optimized fluorescence quenching efficiency. These results about fluorescence quenching properties of Ag-dielectric-Au three-layered nanoshells present a potential for design and fabrication of fluorescence nanosensors based on tuning the geometry of the inner core and the separate layer.
研究领域:
纳米生物学
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材料科学
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光学
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产品关联
DOI
PubMed
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Pengju Chen,Peng Xiao,Tian Tian,Yang Li
Ytterbium silicate (Yb 2 Si 2 O 7 ) and lanthanum zirconate (La 2 Zr 2 O 7 ) ceramic powders were synthesized by the sol–gel method. A novel tri-layer La 2 Zr 2 O 7 /Yb 2 Si 2 O 7 /SiC environmental barrier coating was prepared on the surface of C/SiC composites to improve the service temperature of the coating (above the Si melting point, 1683 K). Results show that both Yb 2 Si 2 O 7 and La 2 Zr 2 O 7 ceramic powders had extremely high purity and were accompanied by a large number of nanoparticles. The tri-layer La 2 Zr 2 O 7 /Yb 2 Si 2 O 7 /SiC coating can efficiently prevent the oxidation failure of C/SiC composites in 1773 K air environment for more than 100 h with slight weight loss of 5.71 × 10 −3 g·cm −2 and the matching weight loss rate of 5.71 × 10 −5 g·cm −2 ·h −1 . No significant chemical reaction was observed between Yb 2 Si 2 O 7 middle and La 2 Zr 2 O 7 outer coatings during the oxidation process at 1773 K, indicating that the tri-layer La 2 Zr 2 O 7 /Yb 2 Si 2 O 7 /SiC coating had better oxidation stability in 1773 K air environment.
研究领域:
材料科学
·
涂层技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Dong Wang,Jinmei Li,Baoyu Gao,Yue Chen,Zhining Wang
Forward osmosis (FO) has attracted enormous research interests as a prospective low-energy membrane-separation technology in many potential applications such as desalination, wastewater treatment and agricultural irrigation. The novel thin film nanocomposite (TFN) FO membranes have demonstrated great improvement in separation performance and antifouling capacities. As an intermediate layer, carbon nanotubes (CNTs) could control the interfacial polymerization (IP) process to obtain an ultrathin and dense polyamide (PA) selective layer. Silver phosphate loaded acidified graphitic carbon nitride (aCN/AP) exhibited excellent nanofiller properties, including excellent aqueous dispersity, confined mass transfer, and outstanding bacteriostasis. In view of this, we fabricated TFN FO membranes with CNT as interlayer and aCN/AP as nanofillers into PA layer. Improved hydrophilic and enhanced negatively surface charges were obtained with the incorporation of aCN/AP. The optimal TFN-aCN/AP membrane possessed a higher water flux of 67.0 L m −2 h −1 accompanied with a reverse salt flux lower than 3.0 g m −2 h −1 by using 1 M NaCl as draw solution. Besides, the TFN-aCN/AP membrane showed excellent antibacterial property against both gram-negative E.coli and gram-positive S.aureus with a sterilization rate of 99.0% and 92.0%, respectively. This work provides a new strategy to fabricate novel TFN FO membranes with high permselectivity and excellent antibacterial capacities.
研究领域:
材料科学
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环境工程
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生物学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Wu Shaojun,Xu Xianglai
The electromagnetic wave-absorbing materials provide an efficient solution to notable electromagnetic pollution issues. However, as for the design of ultra-wideband, layered absorbing materials remain a critical challenge in the field of wave absorption. This paper first designs a series of broadband tri-layered absorbing structures using the prepared hybridized absorbers of EG-TEA@Fe 3 O 4 @GO with wrinkled morphology and MoO 3 @MWCNT with necklace-like morphology, as well as common dielectric and magnetic absorbers via particle swarm optimization algorithm, determining the appropriate range of electromagnetic parameters for the transmission layer (0 < ε ′ < 5, 0 < ε ″ < 1; 0 < μ ′ < 1, 0 < μ ″ < 0.5), absorption layer (5 < ε ′ < 7, 1 < ε ″ < 2; 1 < μ ′ < 1.2, 0.5 < μ ″ < 0.7) and reflection layer ( ε ′ > 7, ε ″ > 2; μ ′ > 1.2, μ ″ > 0.7) in wideband absorbing materials. Based on these findings, tri-layered absorbing structure with a wider effective absorption bandwidth of 15.63 GHz, stronger stealth capability with maximum RCS reduction of 17.9 dB m 2 and relatively thinner thickness was constructed, which was consistent with the predicted result. The absorption mechanism of the designed tri-layered absorbing structure, dominated by dielectric loss below 4 GHz and magnetic loss above 4 GHz, as well as multiple reflections induced by the fabricated absorber’s unique morphologies, is analyzed through CST simulations and electromagnetic analysis. The tri-layered absorbing structures we developed demonstrate significant advantages over similar reported counterparts, indicating great potential for applications in the ultra-wideband absorption field, and providing an effective method for the fabrication of ultra-wideband absorbing materials via controlling each layer’s electromagnetic parameters to a suitable range and adjusting the unique morphology of the absorbers with high specific surface area. Graphical abstract
研究领域:
电磁学
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材料科学
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物理学
✓ 已验证
产品关联
DOI
高影响因子
E-POLYMERS
·
2024
·Vol. 24
·期 1
·
IF 3.2
Yi Guo
To address the excessive energy consumption of building cooling, the coverage of passive radiation cooling materials on the surface of buildings can effectively save the global refrigeration power resources and reduce the greenhouse gas emissions generated by refrigeration equipment. In this work, passive radiation hydrophobic fabric cooling materials with three functional layers (i.e., top polydimethylsiloxane [PDMS] film layer for solar emissivity, middle polymethylmethacrylate [PMMA] film layer for solar reflectivity, and bottom cotton fabric layer for support) were prepared. This passive radiation cooling material with optimized thickness of PDMS (1.5 mm) and PMMA (3.5 mm) have a rich uneven filament structure and ideal internal bonding structure, which enabled 94% of solar reflectivity and 93.4% of atmospheric window emissivity (8–14 μm). Top layer of the composite film was hydrophobic (a contact angle of 117°) and allowed the rolling of water droplets to remove most of the surface dust. Moreover, these composites presented an excellent cooling of 7.7–15.0°C in the outdoor real cooling test. For medium-sized houses, the roof covered with composite was expected to reduce the emission CO 2 by 17% every year. The findings of this work indicated that the prepared three-layered radiation cooling materials have great potentials in thermal energy storage buildings.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Yuanyuan Zheng,Zhonghua Dai,Chenxi Liu,Hang Chen,Xiaolong Wang,Xin Wang,Xin Zhao,Weiguo Liu,Yu Cong,Shuitao Gu
Polymer dielectrics are extensively studied for applications in electronics pulsed power systems owing to their excellent processability, high breakdown strength and low energy loss. To synergistically achieve high energy density and high discharge efficiency, we report an asymmetric three-layer all-polymer composite, which consists of a mixture of P(VDF-HFP) and P(St-MMA) as an intermediate layer sandwiched between a linear polymer P(St-MMA) dielectric layer and a nonlinear polymer P(VDF-HFP) dielectric layer. The results of the study showed that a high efficiency of 94.14 % and a high energy discharge density of 14.86 J/cm 3 were achieved concurrently. In this case, the linear dielectric layer provides high energy efficiency, and the high energy density is provided by the nonlinear layer dielectric layer. In particular, the middle layer can effectively balance the electric field distribution, which improves the breakdown strength and increases the energy density. The structural design of asymmetric three-layer all-polymer films provides an effective way to realize high-performance dielectric energy storage materials .
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2025
·
IF 5.6
Zhichao Wang,Chuanzhen Huang,Zhenyu Shi,Hanlian Liu,Xu Han,Zhuang Chen,Shuying Li,Zhen Wang,Jun Huang
The in vitro blood-brain barrier (BBB) structures can offer advantages for studying cerebrovascular functions and developing neuroprotective drugs. However, currently developed BBB models are overly simplistic and inadequate for replicating the complex three-dimensional architecture of the in vivo BBB. In this study, a method is introduced for fabricating a three-layer vascular structure exhibiting BBB function using a coaxial extrusion bioprinting technique with a two-layer nozzle. Photocurable materials were incorporated into the inner layer of the coaxial nozzle, and photoinitiators from the outer layer diffused into the inner layer. As a result, only the materials in the inner layer at the interface between the inner and outer layers underwent crosslinking upon UV exposure. After removing the uncrosslinked materials, a two-layer vascular structure can be formed. Subsequently, a three-layer structure was established after seeding endothelial cells. The perfusion experiments demonstrated that the vascular structure facilitated the continuous flow of culture medium, thereby providing nutrients and oxygen to the surrounding neural tissue. The drug screening analysis indicated that this vascular structure could possess barrier function, allowing the passage of small molecular drugs while effectively blocking macromolecular drugs. Overall, these results suggest that the three-layer vascular structure exhibits excellent perfusion capacity and barrier function, making it a promising candidate for neuroprotective drug screening.
研究领域:
生物医学工程
·
药理学
·
神经科学
✓ 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）