RENEWABLE ENERGY
·
2026
·
IF 9.1
Yanbo Liu,Jiajia Zheng,Yanan Liu,Xiaoxiao Wang,Yen Wei,Seeram Ramakrishna,Bo Yang
Solar-driven interfacial evaporators represent a promising approach to alleviate global freshwater scarcity. However, practical applications still face challenges such as low evaporation efficiency, salt scale accumulation, and unstable evaporation. Therefore, we polymerized and deposited polydopamine (PDA) and hydrothermally synthesized CuS nanoparticles onto a polyimide (PI) aerogel to prepare a superhydrophilic porous CuS/PDA@PI nanofibrous aerogel. The aerogel achieved >97% light absorption over 200-2500 nm and a water evaporation rate of 1.963 kg m −2 h −1 under one sun irradiation (1 kW m −2 ). The apparent total evaporation efficiency reached 119.8%, exceeding the theoretical limit due to additional environmental heat harvesting. Even after 1200 min of cycling, the aerogel maintained an apparent total evaporation efficiency of 116.6%. The evaporator maintained an apparent total evaporation efficiency of 88.7% under a salt (20%) environment and exhibited self-cleaning performance. Furthermore, the aerogel exhibited purification performance for dye wastewater, acidic and alkaline solutions, and seawater. This superhydrophilic evaporator provides a viable route for practical seawater desalination.
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DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Wenchao Zhang,Yong Zhang,Dong Yue,Puzhen Wang,Yunpeng Liu,Haijuan Wu,Jialong Li,Yu Feng
The high-speed train is developing towards higher speed and greater load capacity. As an important part of this, inverter-fed traction motors need higher power. As the turn-to-turn insulating material for inverter-fed traction motors, polyimide (PI) does not satisfy the requirements for breakdown strength and corona aging life with higher power. In this paper, the heterogeneous all-organic composite is designed with polyimide as matrix and acrylic elastomer (DE) as reinforcing material. When the load of DE is 0.5 wt%, the breakdown strength of the thermosetting DE/PI composites is up to 740 kV/mm, which is 60 % higher than PI (462 kV/mm) and the corona aging life is up to 70.4 h which is increased by about 340 % compared with PI (16 h). The synergy of free volume and trap makes comprehensive properties enhanced in the thermosetting DE/PI composite. This work provides a new design for turn-to-turn insulation with a high voltage level and a high operating frequency.
研究领域:
材料科学
·
电气工程
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高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 39
·期 4
·e70109
·
IF 0
Yun Xiong,Yifan Shu,Shi Cai,Shengpeng Liu,Xiaoyu Wu
The efficient separation of gases under high-temperature industrial conditions is crucial for addressing global energy and environmental challenges, particularly in processes such as CO₂ capture in natural gas processing, power plant flue gas treatment, and cement plant emissions. However, conventional membranes often suffer from interfacial defects, low gas selectivity, and poor thermal stability, which limit their practical applications. In this study, we aimed to develop high-performance mixed matrix membranes (MMMs) to improve CO₂/CH₄ separation performance. Amino-functionalized UiO-66-NH₂ was incorporated into a polyimide (PI) matrix using a simple, scalable fabrication process involving phase inversion and thermal imidization, which ensured uniform dispersion of UiO-66-NH₂ particles and facilitated large-scale production of dense, defect-free membranes. At an optimal UiO-66-NH₂ loading of 2 wt%, the MMMs achieved a CO₂ permeability of 451 Barrer and a CO₂/CH₄ selectivity of 6.62 at 25°C and 0.1 MPa, representing improvements of 23.91% and 114.94%, respectively, compared to pure PI membranes. The performance enhancement was attributed to the increased free volume within the membrane and the strong Lewis acid–base interactions between the amino groups of UiO-66-NH₂ and CO₂ molecules. Long-term stability testing at 300°C demonstrated excellent thermal stability, with consistent gas separation performance maintained over 160 h, confirming the membranes' suitability for high-temperature industrial applications. Furthermore, the UiO-66-NH₂/PI MMMs achieved an excellent balance between high permeability and selectivity, outperforming both organic and inorganic membranes, as well as certain traditional MOF-based MMMs. These findings offer a promising strategy for the development of robust and sustainable MMMs for high-temperature industrial gas separation processes.
研究领域:
材料科学
·
化学工程
·
环境科学
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DOI
Polymers
·
2026
·Vol. 18
·期 6
·
IF 5.8
Qian Zhang,Mingyang Cao,Chenxia Tang,Yuqing Zhou,Xiaoli Peng
Solid polymer electrolytes (SPEs) hold great potential in high-safety energy storage but face two key bottlenecks: low room-temperature ionic conductivity and insufficient mechanical strength. This study proposes a synergistic optimization strategy of “long-carbon-chain regulation of polymer microstructure combined with porous polyimide (PI) support”. A linear random copolyester, poly(1,3-propylene-co-1,4-butylene succinate-co-sebacate) (PBPSS), was synthesized via melt polycondensation using 1,3-propanediol, 1,4-butanediol, succinic acid, and sebacic acid as monomers. Subsequently, the PBPSS-75 composite electrolyte was prepared with this copolyester as the matrix and porous PI as support. Results show that long-carbon-chain sebacic acid effectively regulates polymer segment flexibility and free volume, synergistically enhancing ionic conductivity and interfacial mechanical stability with lithium metal. Experimental data indicate that PBPSS-75 composite electrolyte exhibits an ionic conductivity of up to 4.25 × 10−5S cm−1(30 °C), a lithium-ion transference number of 0.81, and an electrochemical stability window of 4.48 V (vs. Li/Li+). In LiFePO4//Li batteries, it maintains nearly 100% capacity retention after 300 cycles at 0.5 C, and achieves stable cycling for over 800 h in lithium symmetric cells. This study confirms that the combined strategy effectively addresses the conductivity-mechanical property trade-off of SPEs, providing theoretical guidance and technical reference for high-performance solid-state battery material design.
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DOI
PubMed
高影响因子
COMPOSITES COMMUNICATIONS
·
2020
·
IF 4.915
Menglin Li,Lei Sheng,Rong Xu,Yang Yang,Yaozong Bai,Shangjun Song,Gaojun Liu,Tao Wang,Xianli Huang,Jianping He
Polyimide (PI) nanofiber membrane prepared by electrospinning technique exhibits poor mechanical strength for the slippage of fibers, which limits it applied into lithium ion battery (LIB). In this study, we are devoted to promoting the macro mechanical strength of PI nanofiber membrane by inhibiting the slippage among the fibers. Lithium polyacrylate (PAALi) is a kind of excellent binder, and it contributes to increasing the adhesion effect between the fibers. As a result, the PI nanofiber membrane treated by PAALi solution shows the mechanical strength of 16.1 MPa, higher than 5.0 MPa of pristine PI membrane. The introduction of this binder makes the originally loose and disordered PI nanofibers cross-link with each other and prevents from the slip between the fibers. Surprisingly, the PAALi binder has no effect on the thermal stability and electrochemical performance of PI nanofiber separator. Furthermore, these LiCoO 2 /Li cells using the modified PI nanofiber separators exhibit better cycling stability and superior rate performance compared with the cells containing pristine PI separators. It demonstrates that the use of PAALi binder is a promising method to improve the mechanical strength of nanofiber membrane, which gets it applied in the high-power LIB.
研究领域:
材料科学
·
能源技术
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 39
·50997
·
IF 3.125
Aftab Ahmad,Hui Tong,Tao Fan,Ju Xu
Flexible high-temperature polymeric dielectrics with advanced dielectric properties are urgently demanded in various applications. In this work, series of polymer blend films were prepared from aromatic polythiourea (ArPTU) and polyimide (PI). The experimental results revealed that the blend films were properly engineered to achieve higher breakdown strength, greater dielectric constant, and larger energy density than pure PI film. For instance, the optimum property was obtained from the blend film with 10 wt% ArPTU, exhibiting prominent dielectric properties ( K = 4.52, E b = 443 MV/m), enhanced energy density (4.00 J/cm 3 ) as well as excellent heat resistance ( T g = 419°C). In addition, stable dielectric properties at broad temperature range from −50 to 250°C were also acquired. It is deduced that the good compatibility from ArPTU and PI with similar polarity are responsible for the improved properties. The superior comprehensive properties which combine the advantages of ArPTU and PI suggest the potential applications of ArPTU/PI blend film in high-temperature dielectric areas.
研究领域:
材料科学
·
电气工程
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DOI
高影响因子
Photonics
·
2022
·Vol. 9
·期 10
·784
·
IF 2.536
Zixin Yang,Gaozhe Cai,Jianlong Zhao,Shilun Feng
Urine examinations are widely applied in hospitals using urine test strip analyzers or other sophisticated professional instruments. However, such methods are inconvenient health monitoring of patients at home. Herein, we construct an optical device for point-of-care testing (POCT) for urine analysis at home or on the spot. A black box and color calibration curve are established to eliminate the influence of ambient light with an independent internal lighting system included in the device. A Raspberry Pi with a CSI camera is programmed to automatically collect the strip images and identify the HSV values of the image with an image processing algorithm. During this process, these corrected colors are converted to concentration values by preloaded standard curves. Under optimal conditions, the proposed POCT device can quantitatively and automatically detect glucose within 1 min, with linear detection ranging from 2 mM to 60 mM and a detection limit of 1.16 mM. In addition, the device demonstrates satisfactory accuracy and quantitative analysis of ketone bodies, glucose, protein, occult blood, pH, and leukocytes in human urine samples with high-resolution concentrations, achieving results similar to those obtained with hospital instruments. The proposed device is portable and user-friendly, providing convenient colorimetric analysis for urine. Furthermore, the proposed device also has considerable potential for the development of in vitro diagnosis methods through combination with other test strips.Keywords:colorimetry detection;HSV parameters;point-of-care testing;urine test
研究领域:
医学诊断
·
生物工程
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Junhao Xin,Xiaowei Zhou,Guolong Huo,Zhiguang Zhang,Yuchen Zhang,Shuanyan Kang,Zhongde Dai,Nanwen Li
In the current study, three 6FDA 1 /BPDA 1 -based polyimides (PIs) containing different diamine moieties (DMB, TCDB, TFDB) were selected to prepare CMS membranes (CMSMs), providing a systematic study of PIs with different side group functionalization. The resultant CMSMs were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectra, and CO 2 absorption measurements. Pure gas (N 2 , O 2 , CH 4 , CO 2 ) and mixed gas (CO 2 /CH 4 ) permeability tests were also conducted. The resultant CMSMs exhibited attractive gas separation performance. Compared to DMB-based PI, TFDB-based with trifluoromethyl (-CF 3 ) side groups exhibited ultra-high permeability (P CO2 = 14938 Barrer, P O2 = 3146 Barrer) and moderate selectivity (α CO2/CH4 = 20.3, α O2/N2 = 4.5), while CMSMs prepared from PI with chlorine functionalization showed higher gas permeability (P CO2 = 6031 Barrer, P O2 = 1311 Barrer) and selectivity (α CO2/CH4 = 46.2, α O2/N2 = 6.5). The results indicated that side group functionalization on PIs exerts a considerable influence on the gas permeation properties of CMSMs.
研究领域:
材料科学
·
化学工程
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高影响因子
POLYMER INTERNATIONAL
·
2025
·
IF 3.6
Fan Kong,Fei Fang
An amphiphilic block copolymer, poly(ethylene glycol)- b -poly( N -vinyl carbazole), functionalized with a 1,8-naphthalimide fluorescent signaling moiety containing a pH-responsive piperazinyl recognition unit (PEG- b -PVK- co -PNA), was synthesized via reversible addition-fragmentation chain transfer polymerization. The block copolymer demonstrates a low molar mass dispersity and spontaneously self-assembles into uniform nanoparticles in aqueous media, serving as a fluorescent sensor for detecting hydrogen ion. The emission from the PVK block is effectively quenched, whereas the 1,8-naphthalimide moiety exhibits a pronounced fluorescence enhancement at 505 nm due to Förster resonance energy transfer between the PVK donor and the 1,8-naphthalimide acceptor in the copolymer nanoparticles. The photoluminescence intensity at 505 nm displays a linear correlation with decreasing pH values in the range 3.0–6.5 for the copolymer nanoparticles in acidic medium, highlighting the block copolymer's potential for quantitative pH sensing in acidic environments. © 2025 Society of Chemical Industry.
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高影响因子
POLYMER INTERNATIONAL
·
2021
·Vol. 70
·期 11
·1612-1620
·
IF 2.99
Kuan Liu,Yuhan Wei,Jinyao Xu,Lingfei Qiu,Shaping Hu,Jiayi Wan,Juhua Feng
A novel conjugated polymer PFCZ-IM containing 2-(thiophen-2-yl)-1H-benzo[d]imidazole units was synthesized and characterized. The basic photophysical properties of the polymer and its fluorescence recognition behaviors toward metal ions and amino acids were investigated. In the study of the response of metal ions, PFCZ-IM had high sensitivity to Fe 3+ , Ag + and Cu 2+ , which significantly quenched the fluorescence of the polymer. The binding of the 2-(thiophen-2-yl)-1H-benzo[d]imidazole moiety to Cu 2+ was investigated by density functional theory calculation. Interestingly, [PFCZ-IM-Cu 2+ ] also exhibited outstanding characteristics of fluorescence ‘turn on’ in the presence of cysteine (Cys), as the interaction between Cu 2+ and Cys caused the polymer to dissociate from the complex. In particular, addition of 30 μmol L –1 of Cys can increase the Cu 2+ -quenching fluorescence of PFCZ-IM by 34.8 times with short response time, demonstrating that [PFCZ-IM-Cu 2+ ] has tremendous potential in the actual detection of Cys. This polymer is expected to be utilized for dual fluorescence detection of specific metal ions and Cys. © 2021 Society of Industrial Chemistry.
研究领域:
材料科学
·
分析化学
·
生物化学
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DOI
高影响因子
POLYMER INTERNATIONAL
·
2019
·Vol. 68
·期 12
·1952-1960
·
IF 2.433
Yu Wang,Huihui Liu,Xiaoqiang Zheng,Yongping Bai
Our objective is to develop a versatile and facile method that allows the synthesis of novel primary fluorinated co-oligomers as precursors of photo-crosslinkable networks. Transparent carboxyl-terminated fluorinated co-oligomers with molecular weights ranging between 2000 and 10 400 g mol −1 were synthesized via facile degradation. The structural changes of fluorinated backbone were investigated using various analysis techniques. Then two major approaches, namely esterification and ring opening, were applied to obtain photochemical diacrylates (HEMA- and GMA-IEM-terminated co-oligomers). These two precursors can be cured in 60 s under UV radiation without high temperature, high pressure or toxic solvent. The glass transition temperatures of HEMA- and GMA-IEM-terminated fluoropolymers at about −20 °C, assessed from differential scanning calorimetry, showed an increase after crosslinking, and the glass transitions at 20 °C were no longer observed. These two crosslinked films were found to have higher decomposition temperatures, when compared to starting precursors. The contact angles on the surface of the two elastomer materials were only about 74° and 78°, which increased to 105° and 110° after UV irradiation. The tensile strength of the two cured fluoroelastomers can still reach 1.3 MPa at 200 °C. © 2019 Society of Chemical Industry
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高影响因子
POLYMER INTERNATIONAL
·
2017
·Vol. 66
·期 12
·1897-1905
·
IF 2.07
Yingshuang Shang,Yifan Liu,Zhaoyang Wang,Zilong Jiang,Zhenhua Jiang,Haibo Zhang
A series of copolymers containing conjugated fluorene groups as a compatibilizer to improve the dispersion of multi-walled carbon nanotubes (MWCNTs) were prepared and used to improve the wear resistance of poly(ether ether ketone)/graphite (PEEK/GP) composites. The solubility of MWCNTs had a maximum at a concentration ratio of 2:1 polymer:MWCNTs. Transmission electron microscopy indicated that polymer − MWCNT interactions were capable of partially debundling the nanotubes in chloroform, with individual nanotubes or small bundles clearly observed. The tribological properties of PEEK composites incorporating the modified MWCNTs were investigated using a pin-on-disc apparatus and a block-on-ring apparatus. The PEEK composites had a lower frictional coefficient under the block-on-ring testing condition, but a lower wear rate was achieved in the pin-on-disc test. © 2017 Society of Chemical Industry
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
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