ACS Applied Polymer Materials
·
2025
·
IF 4.7
Jiahong Xiang,Li GuangMing,Zhenbang Zhang,Tao Chen
This study introduces the fabrication of dual-layer composite nanofiber membranes incorporating AG80 (tetrafunctional epoxy resin), BN (boron nitride), and PI (polyimide) through electrospinning, with the aim of overcoming the limitations of conventional polyimide (PI) materials in thermal management and electrical insulation for flexible circuit boards. Although PI is recognized for its mechanical strength, chemical stability, and insulating properties, its low thermal conductivity, brittleness, and complex processing challenges limit its broader application. By precisely controlling the composition of AG80, BN, and PI, and optimizing electrospinning parameters, we successfully developed a nanofiber membrane that exhibits enhanced thermal stability and insulation properties. The resultant membrane demonstrates remarkable flexibility, retaining mechanical integrity after 10,000 bending cycles, and achieves a high thermal conductivity of 1.42 W/m·K. Optimized porosity further enhances surface adhesion, rendering it ideal for high-performance flexible circuit boards. These findings provide valuable theoretical and practical insights for the design and development of advanced flexible electronic devices.
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
Journal of Physical Chemistry C
·
2015
·
IF 4.772
Yuangang Li,Rongrong Wang,Huajing Li,Xiaoliang Wei,Juan Feng,Kaiqiang Liu,Yongqiang Dang,Anning Zhou
Co-Pi decorated TiO2@graphitic carbon nitrides (g-C3N4) nanorod arrays (denoted as CCNRs) with different mass ratios of g-C3N4 have been constructed on the FTO substrate through three processes, hydrothermal growth, chemical bath deposition and electrodeposition. First, TiO2 nanorod arrays were grown onto a FTO substrate by a hydrothermal method. Second, g-C3N4 was coated onto the TiO2 nanorod arrays by immersing the above substrate with TiO2 nanorod arrays into a solution of urea and then heated at higher temperature. In this procedure, the amount of the g-C3N4 on the TiO2 nanorod arrays can be controlled by tuning the concentration of the urea solution. At last, Co-Pi were decorated on the surface of the TiO2@g-C3N4 by electrodeposition. The as-prepared CCNRs were characterized by XRD, FESEM, TEM, XPS, UV–vis, and FTIR, respectively, which illustrated that Co-Pi moieties were successfully decorated on the hybrid TiO2@g-C3N4 nanorod arrays. Photoelectrochemical (PEC) measurements have demonstrated that the prepared CCNRs serve as an efficient and stable photoanode for PEC seawater splitting. The photocurrent density reaches 1.6 mA/cm2 under 100 mW/cm2 (AM1.5G) light illumination at 1.23 V (RHE). More significantly, the CCNRs photoanode is quite stable during seawater splitting and the performance remain undiminished even after 10 h continuous illumination. Finally, a systematical photocatalytic mechanism of the Co-Pi decorated TiO2@g-C3N4 was proposed, and it can be considered as potential explanation of enhanced PEC performance.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2019
·
IF 3.78
Junfeng Cheng,Jun Zhou,Cheng Zhang,Zheng Cao,Dun Wu,Chunlin Liu,Hui Zou
To achieve an enhanced laser marking for polypropylene , the “core-shell” ATO@PI (antimony-doped tin oxide@polyimide) laser-sensitive composite was successfully designed and prepared. This laser-sensitive composite consisted of an ATO “core” with high photothermal conversion efficiency and a PI “shell” with high laser induced carbonization rate. Compared with pure ATO, the results showed that 0.3 wt% of the ATO@PI composite endowed polypropylene with an enhanced laser marking performance. The results of SEM and TEM revealed that PI was tightly coated around the ATO surface and the laser-sensitive composite particles were approximately spherical. Both Raman and near infrared (NIR) absorption spectrum observed that, after irradiation of 1064 nm laser, the carbonization degree of polypropylene using ATO@PI was much higher than that of only using pure ATO. The photothermal conversion of ATO and the local carbonization of PI in the composite synergistically increase the degree of laser induced carbonization of polypropylene. Importantly, the “core-shell” laser-sensitive composite designed here further broadens the application prospects of inorganic particles in the field of polymer laser marking.
研究领域:
材料科学
·
激光技术
✓ 已验证
产品关联
DOI
高影响因子
FIBERS AND POLYMERS
·
2021
·Vol. 22
·期 3
·664-675
·
IF 2.153
Liu Huizhong,Li Dawei,Shen Ying,Deng Bingyao
Due to the ultralow density and high specific area, nanofibrous sponges show great potential in the field of filtration and separation. To prepare nanofibrous sponges for high temperature smoke filtration, polytetrafluoroethylene (PTFE) was chosen due to its corrosion resistance and high temperature resistance. PTFE nanofiber prepared via electrospinning shows irregular concave-convex pores in the fiber body, which can improve the specific surface area and further enhance filtration performance. However, sponges made of PTFE nanofiber suffered from severe shrinkage, which limited the development in sponge products. In this study, polyimide (PI) nanofiber converted from polyamic acids (PAAs) nanofiber was introduced into the PTFE sponges to reinforce the dimensional stability. The parameters that influenced the morphology, porosity, shrinkage ratio, and thermodynamic properties of the composite sponges were also investigated. Moreover, the filtration performance of the composite sponges was tested. Results indicated that PTFE/PI composite nanofiber sponges possessed high porosity (94.34–98.12 %), excellent thermal stability (above 550 °C), and decent filtration efficiency (the maximum filtration efficiency reached 99.97 % to PM 2.0) were prepared, which demonstrated the potential in the field of high-temperature filtration.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Min Sang,Guanghui Liu,Shuai Liu,Yuxuan Wu,Shouhu Xuan,Sheng Wang,Shanyong Xuan,Wanquan Jiang,Xinglong Gong
In recent years, soft electrothermal actuators (ETAs) have attracted great concern because of their potential applications in biomimetic intelligent devices, soft robotics and aerospace engineering. However, achieving the simultaneous optimization of low-voltage actuation, ultrafast preparation and highly integrated functionality are main challenges to the development of ETAs. Herein, a flexible, hydrophobic, mechanically robust and electromagnetic-interference (EMI) shielding PTFE/MXene/PI soft ETA is constructed through a very simple and fast “cutting and sticking” method by taping PTFE and PI tapes onto the surface of MXene film. The commercially available PTFE and PI tapes endow PTFE/MXene/PI sandwich structure with ideal mechanically robustness and hydrophobic self-cleaning function, thus it can work in different environments. Remarkably, PTFE/MXene/PI sandwich structure shows an outstanding EMI shielding ability with the maximum SE T value of 44 dB owing to the high electrical conductivity of MXene film. More importantly, the PTFE/MXene/PI sandwich actuator can bend from PTFE side toward PI side under the electrical stimulus, because the excellent electrothermal MXene layer is sandwiched between the two tapes with large difference in thermal expansion coefficients. Under a 6 V low voltage, the actuator can generate heat energy with the maximum saturation temperature of 110 °C and large bending deformation with the maximum bending angle of 122° within 40 s. Interestingly, the PTFE/MXene/PI structure can be designed and manufactured in different shapes and configurations upon actuation, such as the “S” shape and four-finger gripper. At last, a smart shielding curtain with the combination of actuation properties and EMI shielding performance is finally developed as a principle of concept, which further indicates the multifunctional PTFE/MXene/PI ETA can be widely applied in smart EMI shielding system and soft robotic devices.
研究领域:
材料科学
·
智能设备
·
软体机器人
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 45
·21010-21023
·
IF 3.3
Taoming Yu,Li Liu,Yuehui Wang,Shiwen Zhang,Lili Li,Ce Liang
The construction of photocatalysts with a Z-scheme heterojunction is considered to be a superior strategy for improving photocatalytic activity. In this study, a photocatalyst (PI/TiC/TiO2) with a Z-scheme heterojunction was fabricated, in which polyimide (PI) and TiO2 were used as the organic/inorganic semiconductor photocatalyst and TiC acted as the transmission bridge for electrons between PI and TiO2. In the self-made air flow photocatalytic reactor, the photocatalytic degradation efficiencies of organic dyes by PI/TiC/TiO2 increased with the increase of both the concentration and diffusion rate of O2. The degradation efficiencies of RhB and MB by PI/TiC/TiO2 reached 93.87% and 90.96%, respectively, within 90 min of visible light exposure, showing its outstanding photocatalytic performance. The mechanism analysis indicated that the Z-scheme heterojunction in PI/TiC/TiO2 facilitated the separation and migration of photoexcited charges while retaining stronger redox capabilities for charge carriers. This study provides an insight into the construction of visible light responsive organic/inorganic photocatalysts with Z-scheme heterojunctions for organic pollution treatment applications.
研究领域:
材料科学
·
环境科学
·
光催化技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 101
·期 3
·519-528
·
IF 2.606
Li Xiaohua,Yang Zichun,Shao Huilong,Li Kunfeng,Fei Zhifang
In this paper, PI-reinforced polymethylsiloxane aerogels composites were prepared by using methyltriethoxysilane (MTES) as precursor and polyimide fibers as reinforcement phase in the aqueous solvent system through acid-base two-step method and CO 2 supercritical drying method. The effects of changes in the length and content of PI fibers on the thermal, mechanical, and sound insulation properties of the aerogel composites were systematically studied. The PI fiber is tightly bonded with the flexible aerogel substrate, showing good thermal properties. The density of the prepared samples is between 0.05 and 0.20 g/cm 3 , and the thermal conductivity is between 0.021 and 0.026 W/(m K). The thermal conductivity of samples decreases with the increase of fiber length and increases with the increase of PI fiber content, and the initial thermal decomposition temperature reaches 522.1 °C. During the compression test, PI-reinforced polymethylsiloxane aerogels did not crack in the 20% deformation compression process, and the rebound rate was between 44 and 46%, which was little affected by the reinforcing phase. The maximum compressive strength was 0.023 MPa, which was 1.4 times that of the polymethylsiloxane aerogel without adding reinforcing phase. The sound insulation property of PI simple with density around 52 mg/cm 3 is mainly affected by fiber content and length change in low-frequency region, and the sound transmission loss of the sample with 3 mm and 2 wt% PI fibers reaches 18 dB at 500 Hz.
Graphical abstract
研究领域:
材料科学
·
热力学
·
声学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 11
·6327-6336
·
IF 10.733
Jingchao Liu,Jianming Li,Mingfei Shao,Min Wei
To achieve highly efficient photoelectrochemical (PEC) water splitting, great efforts have been dedicated to develop various photoelectrode materials in pure water electrolytes. Recently, some studies are turning to hydrogen production from seawater or wastewater, to save valuable freshwater resources and make waste profitable. Here, we fabricate one-dimensional SnO2@BiVO4 core–shell nanorod arrays decorated with cobalt-phosphate cocatalyst (1D SnO2@BiVO4/Co-Pi NRAs), which show efficient charge separation and transport properties due to the rational design of conducting core-layer and introduction of the cocatalyst. The as-obtained SnO2@BiVO4/Co-Pi photoanodes exhibit largely enhanced PEC water oxidation performance: the maximum photocurrent density of 2.63 mA cm−2 at 1.23 V vs. RHE is 6.58 times higher than that of pristine BiVO4 films (∼0.40 mA cm−2). Moreover, the ternary photoanode exhibits promising PEC performance for urea oxidation, giving rise to a current density of 3.44 mA cm−2 at 1.23 V vs. RHE in a neutral urea electrolyte. This work presents a sunlight-driven, eco-friendly and sustainable method to produce hydrogen and simultaneously treat urea-rich wastewater.
研究领域:
材料科学
·
能源与环境科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2024
·
IF 10.5
Hao Wu,Xiaohu Ren,Wanxin Hu,Yun Tang,Hongfeng Yin,Huiqing Fan,Hudie Yuan,Chao Wang,Yalou Xin
Polymer-based aerogels have proven to be a promising choice to obtain high-performance and lightweight materials for electromagnetic microwave (EMW) absorption. Here, directional freeze-drying was used to produce multifunctional ultralight CNTs/PI composite aerogels with oriented microchannel structures. The unique oriented pore structure causes the multiple reflections and scattering of incident EMW inside the material, which favors the attenuation of the EM energy. By changing the CNTs content in the composite aerogels, the dipole polarization and the interface polarization can be effectively regulated. With a CNTs content of 30 % and a thickness of 2.5 mm, the minimum reflection loss (RL min ) of −41 dB was achieved at 15.36 GHz. A large effective absorption bandwidth (EAB) of 6.88 GHz was achieved at a thickness of 3 mm. In addition, the CNTs/PI composite aerogels displayed excellent toughness, thermal isolation and the thermal stability. The high-temperature resistant, lightweight composite aerogels proposed in this study could provide a feasible and effective approach for the development of advanced multifunctional microwave-absorbing materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Food Science and Human Wellness
·
2023
·
IF 7
Zhenhua Liu,Mengke Wang,Lijun Meng,Yixiao Chen,Qiuyi Wang,Yan Zhang,Xuefeng Xi,Wenyi Kang
Patrinia scabiosaefolia , is used as wild vegetable in China for more than 2 000 years, with a variety of pharmacological activities, including anti-inflammatory, anti-tumor and hypoglycemic. Based on our ongoing research on chemical constituents and hypoglycemic activity of P. scabiosaefolia , 4 lignan compounds, (+)-isolariciresinol ( 1 ), 7 R ,7' R ,8 S ,8' S -(+)-neo-olivil-4- O - β - D -glucopyranoside ( 2 ), 4- O- methylcedrusin ( 3 ) and patrinian A ( 4 ), were isolated and identified. The hypoglycemic activity showed that compounds 2 and 3 could extremely significantly improve insulin resistance at 100 ( P < 0.001), 50 ( P < 0.001) and 25 µmol/L ( P < 0.01) in IR 3T3-L1 cells. While compound 4 only promoted glucose uptake by IR 3T3-L1 cells at 100 µmol/L ( P < 0.01). Western blotting experiments showed that compounds 2 and 4 up-regulated the protein expressions of p-IRS, PI-3K, p-AKT and glucose transporter 4 (GLUT4), and promoted the transcription of GLUT4 mRNA. Therefore, the mechanisms of compounds 2 and 4 were presumed to improve IR by activating PI-3K/AKT signaling pathway.
研究领域:
药理学
·
分子生物学
·
内分泌学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 36
·26788-26800
·
IF 2.779
Wang Renjie,Huang Aiwen,Yan JiaHui,Cheng Qiaohuan,Chen Qianqian,Yao Chenxue,Zhu He,He Fang,Miao Wei,Zhou Xuefei,Xu Sankui
Photocatalysts with different compositions have wide applications in the field of antibiotics degradation, especially for tetracycline hydrochloride (TC-HCl) degradation. One of the key pathways to improve their performance is by recombination of organic and metallic materials. In this innovative research, the composite photocatalyst PI/ZnO was successfully fabricated by one facile sintering process. The samples were characterized by scanning electron microscope (SEM), Fourier transforms infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The photocatalytic performance of the samples was studied by the UV–visible diffuse reflectance spectrum (DRS). The results showed that the visible-light photocatalytic performance for TC-HCl degradation of PI/ZnO composite was approximately 71.2-fold and 3.1-fold as high as that of pure PI and bare ZnO, respectively. In addition, the mechanism of the photocatalytic reaction was revealed by the radical quenching experiments.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 9
·期 1
·39
·
IF 3.504
Ming Cai,Hongwei He,Xiao Zhang,Xu Yan,Jianxin Li,Fuxing Chen,Ding Yuan,Xin Ning
Bicomponent composite fibers, due to their unique versatility, have attracted great attention in many fields, such as filtration, energy, and bioengineering. Herein, we efficiently fabricated polyvinylidene fluoride/polyimide (PVDF/PI) side-by-side bicomponent nanofibers based on electrospinning, which resulted in the synergism between PVDF and PI, and eventually obtained the effect of 1 + 1 > 2. Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) were used to characterize the morphology and chemical structure of nanofibers, indicating that a large number of side-by-side nanofibers were successfully prepared. Further, the thermal stability, mechanical strength, and filtration properties of PVDF/PI were carefully investigated. The results revealed that the bicomponent nanofibers possessed both good mechanical strength and remarkable thermal stability. Moreover, the mechanical properties of PVDF/ PI were strengthened by more than twice after the heat treatment (7.28 MPa at 25 °C, 15.49 MPa at 230 °C). Simultaneously, after the heat treatment at 230 °C for 30 min, the filtration efficiency of PVDF/PI membrane was maintained at about 95.45 ± 1.09%, and the pressure drop was relatively low. Therefore, the prepared PVDF/PI side-by-side bicomponent nanofibers have a favorable prospect of application in the field of medium- and high-temperature filtration, which further expands the application range of electrospun fiber membranes.
研究领域:
材料科学
·
纳米技术
·
环境工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）