Small
·
2026
·
IF 11.8
Jingxuan Cui,Aihu Feng,Kun Liu,Junge Chen,Le Mi,Yang Yu,Yun Yu
The rapid development of infrared detection technology has spurred extensive interest in advanced functional materials with exceptional infrared stealth capabilities. This work fabricates a novel thermal-insulation and radiation-modulation integrated infrared stealth material, integrating polyimide (PI) aerogel fibers (endowed with thermal insulation) and MXene/tannic acid (TA) composite (featuring low emissivity and oxidation resistance), to achieve thermal camouflage for high-temperature targets. In this composite system, the abundant pores within PI aerogel fibers not only suppress gas convective heat transfer but also extend the heat conduction path along the pore walls, thus achieving efficient thermal insulation. Meanwhile, MXene's metallic-like conductivity and layered structure enable it to efficiently reflect infrared thermal radiation, minimizing radiant heat loss to the surroundings. Consequently, the composite PI/SA/TM exhibits a low thermal conductivity of 0.084 W·m −1 ·K −1 and a low emissivity of 0.17. At an ambient temperature of 200 °C, its radiant temperature is merely 40.7 °C, outperforming pure PI, TM film and commercial fabrics in terms of stealth performance. The incorporation of TA further enhances oxidation stability for PI/SA/TM, retaining excellent emissivity (0.24) even after 15 days of humid heat aging. This work provides new technical support for designing advanced functional integrated infrared stealth materials.
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高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 49
·495401
·
IF 3.874
Qi Wang,Boheng Yuan,Yafei Lu,Fei Shen,Bin Zhao,Xiaogang Han
To address the flammable and chemical unstable problems of liquid electrolyte, the solid electrolyte is a promising candidate to replace liquid electrolyte for solid-state batteries. Herein, a composite polymer electrolyte (CPE) of 3D polyimide (PI)-nanofiber membrane-incorporated polyethylene oxide (PEO)/lithium bis (triflu-romethanesulphonyl) imid (LiTFSI) is reported. Three advantages of the PI nanofiber network in the CPE include providing a continuous, rapid transport channel of lithium ions to improve the Li-ion conductivity, improving the mechanical properties and stability, and effectively inhibiting the dendrite growth of Li metal. The PI/PEO/LiTFSI CPE delivers an ionic conductivity of 4.2 × 10−4 S cm−1 at 60 °C, a wider electrochemical window to 5.4 V, and an excellent thermal stability, which result in the excellent electrochemical performance of LiFePO4 full cells assembled with PI/PEO/LiTFSI CPE.
研究领域:
材料科学
·
能源存储技术
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高影响因子
COMPOSITES PART B-ENGINEERING
·
2023
·
IF 13.1
Yinsong Si,Jintao Sun,Fujian Liu,Huazhang Shen,Xiaoming Qi,Qiao Xu,Chengliang Zhou,Yu Liu,Yaqin Fu
Flexible composite membrane with strong strength and good thermal performances simultaneously are highly desired in broad fields. Herein, rabbit-hair-like silica/polyimide (SiO 2 /PI) composite nanofibers with super durability are prepared by a simple electrospinning and impregnating process. The embedded hollow SiO 2 microspheres and the bamboo-shaped hollow structure of the composite nanofibers endow the membrane with excellent thermal insulation , while the externally coated thin PI layer provides quite high strength without significantly reducing its thermal stability. The obtained SiO 2 /PI composite membrane demonstrates high tensile strength (19.7 MPa), good flexibility (withstanding dynamic bending at least 20000 cycles), low thermal conductivity (18.7–42.8 mW m −1 K −1 ), multi-cycle friction resistance (500 cycles) and abrupt hot/cold alternation stability (near 400 °C). These excellent properties are mainly attributed to the 3D bonding network of the composite membrane and the impregnating-reinforcing effect on single SiO 2 nanofiber. This composite membrane not only overcomes the low tensile strength and poor durability of pure SiO 2 membrane, but also possesses lightweight and fireproof properties, demonstrating broad prospects in thermal insulation, anti-shock of fire/cold and wearable protective fabrics.
研究领域:
材料科学
·
热能工程
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高影响因子
Frontiers in Nutrition
·
2022
·
IF 6.59
Wei Jinfeng,Wang Baoguang,Chen Yixiao,Wang Qiuyi,Ahmed Adel F.,Cui Lili,Xi Xuefeng,Kang Wenyi
Insulin resistance (IR) is a physiological abnormality that occurs when insulin fails to activate the signal transduction pathway in target organs. It was found that supplementation of Nigella sativa seeds with oral antidiabetic medicines helps improve blood glucose control by enhanced β cells activity and alleviation of IR. However, the activities and related mechanisms of phytochemicals from N. sativa seeds have not been thoroughly explored. In this study, the effects of two triterpenoids, 3-O-[β-D-xylopyranose-(1→3)-α-L-rhamnose-(1→2)-α-L-arabinose]-28-O-[α-L-rhamnose-(1→4)-β-D-glucopyranose-L-(1→6)-β-D-glucopyranose]-hederagenin (Hxrarg) and 3-O-[β-D-xylopyranose-(1→3)-α-L-rhamnose-(1→2)-α-L-arabinose]-hederagenin (Hxra), on IR were studied by 3T3-L1 adipocytes model. The results demonstrated that Hxrarg and Hxra inhibited maturation of 3T3-L1 preadipocytes, dramatically stimulated glucose uptake of IR-3T3-L1 adipocytes, promoted transcription of IRS, AKT, PI-3K, and GLUT4 mRNA. Western Blot results suggested that Hxrarg and Hxra were able to markedly up-regulate expression of p-IRS, p-AKT, PI-3K, and GLUT4 proteins. These findings could provide a basic foundation for the continued development and application of N. sativa in medicine and functional foods.
研究领域:
药理学
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内分泌学
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分子生物学
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细胞生物学
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高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2025
·
IF 6.2
Ke Yang,Gang Wu,Bo Zhang,Liangyuan Jia,Huiyan Zhang
Catalytic fast pyrolysis (CFP) is one of the most efficient methods for directly converting biomass into green aromatics. Although ZSM-5 catalyst is efficient at producing aromatics, the catalyst deactivation brings challenge to industrial applications. Constructing additional mesoporous structure in ZSM-5 catalyst can overcome this drawback. In this study, two solid wastes are used as raw materials to synthesize hierarchically porous ZSM-5 catalyst based on solvent-free method, aligning with the target of “green chemistry”. Comparing with the commercial ZSM-5 catalyst, the synthesized catalyst achieves a higher BTX yield (benzene, toluene, and xylene), with increases of approximately 44 %, 7 %, and 12 %, respectively. The mesopore-to-micropore volume ratio is a key factor in determining catalytic efficiency. Moreover, PI-MS is used to monitor the deactivation behavior of catalyst online during the CFP process, showing that the synthesized catalyst has a slower deactivation rate. The hierarchically porous structure plays a crucial role in slowing the transformation of oxygenated coke into graphite-like coke, which is a major contributor to catalyst deactivation. This work can provide a green and convenient method for producing hierarchically porous ZSM-5 catalyst and be useful for improving the selectivity of aromatic compounds, offering a promising alternative to conventional ZSM-5 catalyst in industrial applications.
研究领域:
能源与环境科学
·
催化化学
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高影响因子
Oncology Letters
·
2018
·Vol. 15
·期 4
·5739-5743
·
IF 1.664
Hua Zhang,Yumei Cao,Yuru Chen,Guangxi Li,Hanshu Yu
The present study investigated the inhibitory effects of apatinib on the proliferation of the SMMC-7721 hepatocellular carcinoma cell line to explore the possible mechanism. The MTT assay was used to detect the inhibitory effects of the different concentrations of apatinib on the proliferation of SMMC-7721 cells. Annexin V/PI double staining was performed to investigate the effects of apatinib on the apoptosis of SMMC‑7721 cells. Expression of the apoptosis-related genes Bcl-2, Bax and caspase-9 after apatinib treatment was detected by reverse transcription‑quantitative PCR (RT-qPCR) and western blot analysis. Expression of the PI3K, p-PI3K, Akt and p-Akt proteins after apatinib treatment was detected using western blot analysis. The MTT results showed that apatinib inhibited the in vitro proliferation of SMMC-7721 cells. Annexin V/PI double staining showed that apatinib induced the apoptosis of SMMC‑7721 cells in a concentration-dependent manner. Results of RT-qPCR and western blot analysis showed that apatinib was able to induce the expression of pro-apoptotic genes Bax and caspase-9 and inhibited the expression of anti-apoptotic gene Bcl-2. In addition, the western blot analysis revealed that p-PI3K and p-Akt was significantly decreased following apatinib treatment, while no significant differences were found in the total protein levels of PI3K and Akt. The results of the present show that apatinib is capable of promoting the apoptosis of SMMC-7721 cells by inhibiting the PI3K/Akt signal transduction pathway, upregulating the expression of pro-apoptotic genes Bax and caspase-9, and downregulating the expression level of the anti-apoptotic gene Bcl-2.
研究领域:
肿瘤学
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分子生物学
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细胞生物学
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高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2025
·
IF 4.7
Faxiang Feng,Zanming Zhu,Jiale Li,Shi Su,Guilin Dong,Guanhui Wang,Xiaobing Liu,Runlin Han
The widespread use and even abuse of antibiotics has led to antibiotic wastewater posing a serious threat to global human health. However, due to its poor biodegradability, the effectiveness and cost of traditional wastewater treatment technologies in the field of antibiotic wastewater treatment remain challenging. This study introduces BiCl₃ into a polyimide (PI) solution and employs electrospinning technology to fabricate PI fiber membranes with high BiOCl loading in-situ, demonstrating outstanding photocatalytic performance. The photocatalytic performance of PI/BiOCl nanocomposite membrane was investigated in detail and the mechanism of photocatalytic degradation was explored. Experimental results demonstrate that the nanocomposite membrane exhibited excellent hydrophilicity. It exhibits significant efficacy in degrading tetracycline hydrochloride (TC). Under UV irradiation, it achieves a photodegradation efficiency of 99.3 % for TC within 8 h. After five cycles, the membrane maintained over 90.3 % degradation efficiency for TC, with photodegradation efficacy declining by only 9.1 %. It was found that the photocatalytic degradation of TC was mainly induced by superoxide radical (·O 2 − ). The membrane exhibits excellent stability, recoverability, and reusability, sustaining consistent degradation performance during prolonged operation. This approach offers a novel perspective for future research into developing more efficient and environmentally friendly materials for degrading tetracycline hydrochloride.
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Materials
·
2024
·Vol. 17
·期 16
·4135
·
IF 3.1
Zijia Wang,Yawen Chang,Siyang Jia,Fujuan Liu
In this study, polyimide (PI) and polysulfonamide (PSA) were used as base materials, and polyethylene glycol (PEG) was added to successfully prepare PI/PSA/PEG nanofiber membranes through electrospinning technology. Subsequently, water etching was performed on the membranes, utilizing the water solubility of PEG to form the rough wrinkled structure, further enhancing the surface hydrophobicity. The experimental results showed that under the conditions of a spinning voltage of 10 kV, PI/PSA mass fraction of 15 wt.%, and PEG-to-PI/PSA mass ratio of 1/3, the obtained fiber membranes exhibit a uniform morphology (an average diameter of 0.73 µm) and excellent hydrophobicity (the initial water contact angle (WCA) reaching 130.4°). After PEG water etching, the surface of the PI/PSA/PEG hydrophobic membranes formed the rough wrinkled structure, which not only improved their mechanical properties but also further enhanced their hydrophobicity (the initial WCA increasing to 137.9°). Hence, fiber membranes are expected to have broad application prospects in fields such as waterproofing and moisture permeability.
研究领域:
材料科学
·
化学工程
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高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2024
·
IF 8.3
Xiangyu Mei,Azim Abdullaev,Qingbiao Yang,Kun Peng,Shuaida Shi,Fujian Liu,Yinsong Si,Yaqin Fu
Polyimide (PI) has been extensively used in 5G microelectronics however the relatively high dielectric constant (∼3.5) and moisture adsorption have greatly limit its practical applications in high-frequency region. Here hydrophobic PI/SiO 2 composite films with low dielectric constant and excellent thermal stability were synthesized by dispersing methyl modified hollow silica nanospheres (MHS) into polyamic acid solution prior to imidization treatment. Comparing with unmodified hollow silica nanospheres (HS), the MHS obtained through methyl modification can disperse uniformly in the PI matrix. Thus, the relaxation and orientation polarization of the PI chains as well as their electron migration are suppressed, resulting in a significant decrease in dielectric constant. The PI/MHS-10% film exhibits a stable low dielectric constant (1.9–2.3) in the high-frequency range (8.2 GHz–12.4 GHz), meanwhile maintains a high breakdown voltage (192 kV/mm), mechanical properties (64 MPa) and an excellent thermal stability ( T d5% = 546.5 °C; T max = 589.0 °C). Moreover. PI/MHS demonstrates much lower linear expansion coefficient of 25.0 ppm/K that better matches the substrate. The surface contact angle of PI/MHS increases from 73° to 110° and the water absorption rate decreases from 3.1% to 1.6%, effectively avoiding the moisture adsorption. This work provides a simple method to prepare high-performance composite films for 5G practical applications.
研究领域:
材料科学
·
电子工程
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高影响因子
Polymers
·
2026
·Vol. 18
·期 6
·716
·
IF 5.8
Qichang Guo,Chuanbo Liu,Juncheng Lv,Shutian Liu
The drive systems of new energy vehicles, which employ high-speed motors and low-viscosity lubricants, often subject motor bearings to high-temperature and oil-starved conditions. This can lead to the deformation of polymer bearing cages, resulting in abnormal vibration and noise. In this study, polyimide/molybdenum disulfide (PI/MoS2) composites were prepared, and their thermal stability was characterized using a dynamic mechanical analysis (DMA). High-temperature friction and wear tests against ceramic balls were conducted on a multifunctional tribometer. The wear behavior and surface element distribution were examined by laser confocal microscopy (LCSM), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS). Results indicate that the PI-MoS2composites effectively mitigate surface contact deformation with rising temperatures, reducing the wear loss by around 30% compared to pure PI. This improvement is attributed to the enhanced heat resistance from MoS2and the formation of a lubricating film during friction. The findings provide guidance for selecting and designing composite materials for high-speed bearing cages.
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JOURNAL OF MEMBRANE SCIENCE
·
2026
·
IF 8.8
Chenlu Li,Yuanyuan Yang,De Wang,Yongli Wang,Shixuan Zhu,Chaoqi Zhang,Huatang Cao,Yue Du,Zhenyu He,Yinyu Xiang,Junsheng Li
The practical application of high-energy-density potassium metal batteries (KMBs) is currently hindered by severe safety hazards derived from dendritic growth and the energy-diluting nature of electrochemically inactive components. Here we report a synergistic multi-functional strategy to construct an active separator (MoS 2 /PI), comprising a robust polyimide (PI) nanofiber skeleton and a kinetic-regulating MoS 2 coating. Corroborated by theoretical simulations and experimental characterizations, the potassiophilic MoS 2 layer effectively modulates the local electric field and minimizes the nucleation barrier, thereby orchestrating a uniform K + flux for dendrite-free deposition. Distinguishing this work from conventional inert barriers, the proposed design activates the separator into an energy-boosting component. Both the accessible carbonyl sites in the PI backbone and the MoS 2 coating participate in reversible potassiation. They contribute individual specific capacities of ∼7.0% and ∼21.2% relative to the KPB cathode, respectively, achieving a total capacity enhancement of ∼28.2%. Benefiting from this dual-active mechanism, the K||K symmetric cells exhibit ultra-stable cycling for over 4000 h. Potassium Prussian Blue (KPB)||K full cells equipped with the MoS 2 /PI separator deliver a superior capacity of 93.1 mAh g -1 , significantly outperforming those using commercial PP (69.3 mAh g -1 ) and GF (72.6 mAh g -1 ) separators. The device also demonstrates exceptional durability by maintaining 80.7% capacity after 1000 cycles, corresponding to a stable lifespan of 3270 h. This study validates the active separator strategy as a critical pathway for developing next-generation high-energy-density alkali metal batteries.
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高影响因子
POLYMER BULLETIN
·
2026
·Vol. 83
·期 11
·610
·
IF 4.2
Zhong Tian,Liu Wenlong,Dong Hangshuo,Tang Shaoguo,Ren Hongyu,Zhang Xingwen
Polyimide (PI) is widely used in the fields of integrated circuits and microelectronics due to its strong structure designability and excellent dielectric properties. However, the dielectric constant and loss of traditional PI are relatively high, which cannot meet the requirements of 5G development. In this work, a fluorine-containing photosensitive PI (PSPI) with excellent solubility was prepared by a two-step method. The reactive diluents and a photoinitiator were added to prepare a PSPI resin. After UV curing, the contact angle of the PSPI film was 67.4°, and the relative dielectric constant measured at 1000 kHz was 2.51. By adding 7-phenyl-epoxy polyhedral oligomeric silsesquioxane (B-POSS) as a modifier, at a B-POSS loading of 5%, the resultant POSS/PSPI composite film achieved the maximum contact angle of 94.5°, representing a 40.2% increase compared with pure PSPI. When the B-POSS content was elevated to 7%, the composite delivered the minimum relative dielectric constant of 2.04 at 1000 kHz, which was reduced by 18.7% relative to the pristine PSPI. The addition of B-POSS improved the hydrophobicity and dielectric properties of the PSPI film. This research provides a feasible approach for obtaining low dielectric PI films with excellent comprehensive performance in the field of electronic devices.
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