COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Shicheng Miao,Xiang Wang,Zhenzhen Dong,Yiran Xiang,Lige Wang,Zinuo Zhao
As the power density of miniaturized electronic devices continues to increase, the development of multifunctional thermal management composites that combine excellent thermal conductivity with low dielectric loss has emerged as a critical challenge in addressing the heat dissipation limitations. However, uneven filler dispersion and interfacial phonon scattering and polarization loss in conventional composites severely limit the synergistic optimization of comprehensive performance. In this work, core-shell structured polyacrylonitrile (PAN) with dopamine-modified boron nitride nanosheets (PBN) interconnected to form a thermally conductive network were innovatively constructed by coaxial electrospinning and hot-pressing process design strategies, the final in-plane orientation is achieved through the process of hot-pressing. The incorporation of 10wt% PBN loading resulted in a substantial enhancement in thermal conductivity. The in-plane thermal conductivity of the composite was enhanced to 6.99 W.m -1 .K -1 , representing an increase of 1377.7% over neat PAN, and the out-of-plane thermal conductivity was as high as 0.387 W.m -1 .K -1 , an increase of 674% over the neat PAN film. Excellent electrical insulation (volume resistivity =6.04×10 14 Ω.cm) with low dielectric properties (ε=1.89 at 1 kHz, tanδ=0.012) is maintained at the same time. The material demonstrates considerable potential for application in scenarios such as chip heat dissipation and flexible printed circuit boards, thereby providing innovative solutions for the thermal design of next generation, highly reliable electronic devices.
研究领域:
材料科学
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纳米技术
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电子封装
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热管理
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介电与电气绝缘
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Ruibin Guo,Yue Zhong,Bingjie Wang,Li Li,Wenjing Qin,Yanchun Tan,Zhiwei Zhao,Nijuan Liu,Zunli Mo
The use of tetracycline antibiotics in industry, healthcare, animal husbandry, agriculture, and aquaculture has resulted in excessive concentrations in a variety of aquatic environments. In this work, PAN/Bi 2 WO 6 /Cu 2 O nanofibrous membranes (PBC ENMs) with photocatalytic degradation performance were successfully prepared using electrostatic spinning technique, and the morphology of catalysts and PBC ENMs were characterised by SEM, BET and UV–Vis. The results demonstrated that the prepared nanofibrous membranes could achieve 97.05 % photocatalytic degradation of TC under visible light, and the degradation efficiencies of its derivatives, chlortetracycline (CTC) and oxytetracycline (OTC), reached 90.87 % and 85.12 %, respectively. Free radical trapping experiments and mechanistic analyses showed that·O 2– is the main active factor in the degradation process. The highest degradation rate of 97.05 % was achieved at initial pH = 7.2.PBC ENMs adsorbed above 87.5 % after six cycles of the experiment. The highest degradation rate of 97.05 % was achieved at initial pH = 7.2 PBC ENMs adsorbed above 87.5 % after six cycles of the experiment. Based on the above advantages, the preparation process of PBC ENMs is simple, low-cost and has good catalytic effect, which provides a simple and efficient treatment means for the treatment of TC wastewater and has a broad application prospect.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yijun Fu,Jiahao Liu,Junyi Zou,Sijun Xu,Yanhong Wei,Wei Zhang,Dawei Li
The power supply system is an important part of modern electronic equipment. Traditional batteries have disadvantages such as large volume and poor flexibility. Nanogenerators possess characteristics such as miniaturization, sustainable power supply, and independence from external energy sources. In this work, a piezo-triboelectric hybridized nanogenerator is developed. Barium titanate (BaTiO 3 ) and MXene (Ti 3 C 2 ) are incorporated into the electrospinning process of polyacrylonitrile (PAN), resulting in an electrospun PAN/BaTiO 3 /MXene nanofibrous membrane with significantly enhanced piezoelectric properties in comparison with the pure PAN fibrous membrane. Meanwhile, the electronegative properties of the PAN/BaTiO 3 /MXene nanofibrous membrane are augmented as the negative layer during contact and separation friction. The piezoelectric output voltage of the PAN/BaTiO 3 /MXene nanofibrous membrane reaches up to 6.4 V. When a nickel-copper conductive fabric is used as the positive layer, the piezo-triboelectric hybridized nanogenerator produces an output voltage of 11.3 V, an output current of 300nA, and a maximum output power density of 3.4 mW·m −2 over a contact-separation area of only 2 × 2 cm 2 . In addition, given that MXene itself exhibits excellent photothermal conversion ability, the PAN/BaTiO 3 /MXene nanofibrous membrane can be quickly heated up to about 54℃ under near-infrared irradiation at a power of 0.8 W·cm −2 , highlighting its potential in photothermal-therapy applications.
研究领域:
材料科学
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纳米技术
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能源技术
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 24
·3540
·
IF 4.7
Siyang Wu,Luyu Zhang,Xiaochun Qiu,Yuntai Guo,Liangliang Dong,Mingzhuo Guo,Jiale Zhao
This study reports the development of highly conductive and stretchable fibrous membranes based on PVDF/PAN conjugate electrospinning with embedded silver nanoparticles (AgNPs) for wearable sensing applications. The fabrication process integrated conjugate electrospinning of PVDF/PAN, selective dissolution of polyvinylpyrrolidone (PVP) to create porous networks, and uniform AgNP incorporation via adsorption-reduction. Systematic optimization revealed that 10 wt.% PVP content and 1.2 mol/L AgNO3concentration yielded membranes with superior electrical conductivity (874.93 S/m) and mechanical strength (2.34 MPa). The membranes demonstrated excellent strain sensing performance with a gauge factor of 12.64 within 0–30% strain and location-specific sensing capabilities: moderate movements at wrist (ΔR/R0: 98.90–287.25%), elbow (124.65–300.24%), and fingers (177.01–483.20%) generated stable signals, while knee articulation exhibited higher sensitivity (459.60–1316.48%) but significant signal fluctuations. These results demonstrate the potential of the developed conductive porous PVDF/PAN composite fibrous membranes for applications in wearable sensors, flexible electronics, and human-machine interfaces, particularly in scenarios requiring moderate-range motion detection with high reliability and stability. The findings suggest promising opportunities for developing next-generation wearable sensing devices through the optimization of conjugate electrospun fibrous membranes.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Liu Song,Denghui Ren,Shencheng Fan,Yingyun Li,Shilin Deng,Yanying LV,Jing Li
A critical challenge in self-healing asphalt is concurrently achieving repeatable healing and mechanical reinforcement. This study introduces epoxy-amine functionalized polyacrylonitrile (EA-PAN) fibers to address this gap, leveraging thermally activated chemistry at the fiber-asphalt interface. The fibers were synthesized and systematically characterized (SEM, AFM, FTIR, XPS), and their impact on asphalt composite performance was evaluated through rheological tests (DSR), damage-healing protocols, and nano-computed tomography (Nano-CT). Functionalization significantly enhanced interfacial compatibility. The surface roughness (Ra) of EA-PAN fibers increased to 272 nm, compared to 133 nm for unmodified PAN, and their formamide contact angle decreased to 36.14° from 67.57°. Consequently, the EA-PAN&SBS/MA composite exhibited superior high-temperature performance, with its dynamic shear modulus (G*) increasing by 112.5% at 82°C compared to the PAN&SBS/MA composite. Most notably, EA-PAN&SBS/MA achieved an excellent healing index of 85.11%, significantly surpassing the 61.54% of PAN&SBS/MA. Nano-CT analysis confirmed efficient microcrack repair in the EA-PAN&SBS/MA composite, with its interfacial void ratio decreasing from 83.67% to 11.33% post-healing. FTIR analysis revealed that healing is driven by new covalent bonds from residual epoxy and amine groups. This study validates that EA-PAN fibers provide an effective strategy for developing advanced asphalt composites that are both mechanically robust and highly self-healing.
✓ 已验证
产品关联
DOI
高影响因子
Drug Design Development and Therapy
·
2022
·
IF 4.319
Yuxuan Zhu,Ting Yuan,Yuan Zhang,Jianyou Shi,Lan Bai,Xingmei Duan,Rongsheng Tong,Lei Zhong
Purpose Esophageal squamous cell carcinoma (ESCC) is a refractory malignancy with high morbidity and mortality. Thus, there is an urgent need to find effective targets and agents for ESCC treatment. The purpose of this study was to assess the anti-ESCC effects of a pan-histone deacetylase (HDAC) inhibitor AR-42 and its mechanisms of action.Methods Immunohistochemical staining was performed to detect HDAC1 expression in ESCC and adjacent tissue samples. MTT assay, Edu cell proliferation test, flow cytometry, and subcutaneous xenograft were used to assess the anti-ESCC effects of AR-42; furthermore, the antiangiogenic activity of AR-42 was evaluated using endothelial cell migration, invasion, and tube formation assays as well as zebrafish angiogenesis assay. Western blot analysis was performed to explore the underlying mechanism of the anti-ESCC activity of AR-42.Results HDAC1-positive expression was much higher in ESCC cells than in paracancerous tissues, and the elevated HDAC1 expression was a strong indicator of lymph node metastasis and a more advanced TNM stage of ESCC. Moreover, AR-42 potently suppressed ESCC cell growth through cellular proliferation inhibition and apoptosis induction. Moreover, AR-42 displayed a moderate antiangiogenic activity, and it could significantly inhibit the migration, invasion and tubulogenesis of human umbilical vein endothelial cells as well as intersegmental vessel formation in zebrafish at micromolar concentrations. More importantly, the inhibitory activity of AR-42 on ESCC cells and angiogenesis could also be observed in the TE-1 xenograft model. Further studies showed that AR-42 exerts its anti-ESCC effects mainly by upregulating the expression of p21 and blocking the transduction of multiple signaling cascades related to tumor growth, especially Stat3-mediated signaling.Conclusion Overall, AR-42 has significant potency for inhibiting ESCC cell growth and shows moderate effect in suppressing angiogenesis, displaying strong anti-ESCC effects in vitro and in vivo. Thus, AR-42 deserves further evaluation as a potential candidate for ESCC therapy.
研究领域:
肿瘤学
·
药理学
·
分子生物学
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细胞生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 35
·49017
·
IF 2.52
Baichen Wang,Shuo Dou,Yu Gao,Wei Li
A carbon nanohybrid Pickering stabilizer was synthesized by the hydrothermal reaction of 2-ethyl-4-methylimidazole (EMI), graphene oxide (GO), and carbon nanotubes (CNTs). A water-in-oil (w/o) type Pickering emulsion was achieved using the mixed carbon nanohybrids/Span 80 to form a porous and conductive polyacrylonitrile (PAN) nanocomposites after polymerization. Contact angle and X-ray photoelectron spectroscopy (XPS) results show that the carbon nanohybrid stabilizer is amphiphilic. The effects of the composition and concentration of stabilizers were investigated. When the concentration of the carbon nanohybrid stabilizer is 4 mg ml −1 , the conductivity of the resulting material is 2.31 × 10 −9 S m −1 , which is six orders of magnitude higher than that of porous PAN composites without carbon nanohybrid stabilizer. At the mass ratio of 6GO:1CNTs, the conductivity of porous PAN-based composites reaches 2.47 × 10 −8 S m −1 . The significantly increased conductivity is the evidence for the three dimensional conductive network constructed by carbon nanohybrid stabilizer at the oil/water interface.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
BIOCHEMICAL SYSTEMATICS AND ECOLOGY
·
2018
·
IF 0.847
Latif Ahmad,Yi He,Andrew J. Semotiuk,Quan-Ru Liu,Jia-Chen Hao
Family Boraginaceae has drawn the attention of many botanists for many years because of its systematic position and the presence of toxic pyrrolizidine alkaloids (PAs). Some researcher used these alkaloids as chemotaxonomic markers at the family and subfamily level in several botanical families. Therefore, this explorative study carried out with an aim to determine the distribution of selected PAs and their chemotaxonomic significance in the tribe Lithospermeae. For this, Lithospermeae species along with other Boraginaceae members from different parts of Pan-Himalayan regions in Pakistan and China were brought to Beijing Normal University in Beijing, China. For HPLC fingerprint analysis, dried silica gel aerial parts (500 mg) of twenty-four mature flowering species of Lithospermeae and the available PAs: supinine, heliotrine, lycopsamine, europine, and echimidine were used as chemotaxonomic markers. In the laboratory, the plants of Lithospermeae were investigated for pyrrolizidine alkaloids by using high performance liquid chromatography (HPLC). Five pyrrolizidine alkaloids were identified qualitatively in 24 species of tribe Lithospermeae from Pan-Himalaya. The results of the study support the previous research that PAs can be used as a taxonomic marker. The PAs lycopsamine and echimidine were common in all Onosma species except O. sinicum Diels, O. waddellii Duthie, and O. griffithii Vatke. So we proposed that lycopsamine and echimidine can be used as taxonomic markers for Onosma species from Pan-Himalayan regions. In the case of the genus Maharanga , M. emodi (Wall.) A. DC. and M. bicolor (Wall. ex G. Don) A. DC. show the same composition of PAs lycopsamine and echimidine. But these two species could be easily distinguished from each other; heliotrine is present in M. emodi but absent in M. bicolor . Arnebia guttata Bunge was the only species in the genus Arnebia which was detected for only europine. A. benthamii (Wall. ex) G. Don. I.M. Johnst. and A. euchroma (Royle) I.M. Johnst. were similar in PA composition for heliotrine, lycopsamine, and echimidine. These two species can easily be distinguished from each other: europine is present in the former genus but absent in the latter one. Moreover, the result of HPLC fingerprint analysis shows that supinine is distributed throughout all investigated species from the Pan-Himalayan regions except Lithospermum arvense L. So we proposed that supinine could serve as a chemotaxonomic marker in the tribe Lithospermeae.
研究领域:
植物学
·
药理学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2015
·
IF 3.562
Yanfei Wang,Wei Liu,Gaoming Mo,Ruoyu Zhang
The gelation process in Polyacrylonitrile (PAN)/Dimethyl Sulfoxide (DMSO)/Water (H 2 O) systems was studied by rheology. Chambon–Winter criterion was used to detect the critical gelation temperature variation. Interestingly, we found that the loss tangent coincided at two different temperatures in different frequency periods with the temperature decreased. By using the physical and mathematical analysis, we were able to tell that the first one was the critical sol–gel transition temperature, which appeared at higher temperatures under lower frequencies; and the second point was an indication of another self-similar structure, which appeared at lower temperatures under higher frequencies. We analyzed the coarsening mechanism in the gelation process of ternary blends, and considered that the volume growth of the physical linkage can interpret this unusual phenomenon. A ‘Joint Point to Joint Section’ model, similar to nucleation process, was proposed to interpret the mechanism of the growth of the physical linkages. Based on the above data, phase boundaries of critical gel and the second self-similar structure can be drawn. As the PAN or water content increased, both transition temperatures increased, which indicated the non-solvent water favored the aggregation of PAN molecules and promoted the forming of the second self-similar structure.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Kaini Yang,Xiangyu Wang,Yan Yi,Jun Ma,Ping Ning
The current technologies for production of nanoparticle-membrane are apt to involve complicated multi-step process and/or toxic chemicals and other defects. This study provides a green and clean cryogel manufacture method for fabrication of hydrophilicity Polyacrylonitrile (PAN) membrane with highly porous structure for supporting nano zero-valent iron (NZVI) via a surface modification by employing biodegradable lactic acid. Non-toxic natural compound, glutathione (GSH) was adopted not only as modifiers but also as chelators to promote the capture capacity of hexavalent chromium (Cr(VI)). The specific surface area of the prepared composite (GLPN, 193.16 m 2 /g) was larger than the previously studied NZVI-membrane (PPN, 131.61 m 2 /g), and NZVI was distributed uniformly and not agglomerated on the membrane. Compared with NZVI, the efficiency of GLPN removed Cr(VI) has increased by 39.80%. At low pH and Cr(VI) initial concentration, GLPN can completely remove Cr(VI) when the GSH concentration is increased to 50 mM, and the removal efficiency can still reach 86.96% after 6 regenerations. Visual MINTEQ model and experimental results show that the mechanism of GLPN removing Cr(VI) includes the synergy of electrostatic adsorption, chelation, reduction and co-precipitation. The process conforms to two-parameter nonlinear dynamics and Redlich-Peterson isotherm model. This novel strategy shows that GLPN has excellent stability, reducibility and green reproducibility, and can efficiently remove and recycle heavy metal in the natural water matrices or wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Chao Han,Qin Liu,Qing Xia,Yan Wang
Membranes with high permeance, excellent selectivity coupled with adequate solvent resistance are required for organic solvent nanofiltration (OSN) applications. But the “trade-off” relationship between the solvent resistance and permeance remains a critical challenge for polymeric-based thin film composite (TFC) membranes with necessary chemical crosslinking. Herein, a novel facile cyclization modification of polyacrylonitrile (PAN) nanofiber substrate is proposed by a simply thermal treatment and subsequent alkaline hydrolysis, and employed for the fabrication of TFC-OSN membrane for the first time in strong polar aprotic solvent systems. The reaction mechanism involved, solvent resistance and pore structure of PAN nanofiber substrate brought by the modification are investigated. TFC-OSN membrane supported by the modified PAN nanofiber substrate exhibits ultrahigh solvent permeance up to 13.3 L m −2 h −1 bar −1 coupled with a 99.7% rejection in rose bengal/DMF system and a good long-term stability. This study is therefore believed to provide useful guidelines for the development of next-generation OSN membranes.
研究领域:
材料科学
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化学工程
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环境科学
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产品关联
DOI
高影响因子
Nanoscale
·
2022
·Vol. 14
·期 48
·18133-18142
·
IF 8.307
Fushuo Wu,Zhihua Tian,Peiying Hu,Jingwen Tang,Xueqin Xu,Long Pan,Jian Liu,Peigen Zhang,ZhengMing Sun
Lightweight and flexible multifunctional materials with excellent electromagnetic interference (EMI) shielding and Joule heating performances are highly demanded for smart and wearable electronics. In this work, polyacrylonitrile (PAN) nanofiber films are prepared by electrospinning and then coated with polypyrrole (PPy) via vapor deposition, yielding a continuous three-dimensional (3D) conductive network of PAN@PPy. Ti3C2Tx MXene nanosheets with high electrical conductivity are sprayed on the PAN@PPy film to enhance its EMI shielding performance. The as-prepared PAN@PPy/MXene films (55 μm thick) exhibit a high EMI shielding effectiveness (SE) of 32 dB, achieving an extraordinarily high normalized surface-specific SE (SSE/t) of up to 17 534.5 dB cm2 g−1 from 8.2 to 12.4 GHz; simultaneously, the temperatures of PAN@PPy/MXene films can be driven up to 170.5 °C at an input voltage of 4 V, and exhibit fast-response, stable, and long-term Joule heating performance. The high SSE/t and efficient Joule heating ability of the films bode potential applications in smart and wearable devices.
研究领域:
材料科学
·
电子工程
✓ 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）