JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Jinbiao Min,Zhaoxi Zhou,Hainan Wang,Qihui Chen,Maochun Hong,Heqing Fu
With the development of flexible electronic devices, various requirements for flexible conductive materials have been put forward to. However, the self-healing, mechanical and conductive properties of the flexible materials are poor. Therefore, it is important to prepare self-healing materials with good mechanical and conductive properties. In this paper, room temperature self-healing and conductive composites based on imine reversible covalent bond were prepare by introducing of the carbon nanotube and carbon black. The self-healing, mechanical and conductive properties of the composites were studied. And the structure of the composites was also characterized. The experimental results showed that the mechanical strength and the electrical resistivity of composites were 6.6 MPa and 108 Ω·m, respectively. The composites have excellent room temperature self-healing properties through the reversible exchange of imine bond, and the healing efficiency of mechanical properties and the electrical properties can reach 96% and 93%, respectively. At the same time, the self-healing mechanism was put forward to. In addition, the composites can be recovered by solution recovery and hot pressing.
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
POLYMER COMPOSITES
·
2024
·
IF 4.8
Hao Zhang,Yongjie Yang,Kenan Zhang,Leibo Ji,Zhen Hua,Wei Cao,Junmin Sun,Qinfu Liu
Styrene butadiene rubber (SBR) composites reinforced by cryptocrystalline graphite (CG) and multi-wall carbon nanotubes (MWCNTs) were prepared. The SBR composite with 50 phr CG content displays superior mechanical reinforcement achieving 20.7 MPa in tensile strength. However, the electrical conductivity enhancement is modest. After incorporating MWCNTs as a secondary filler, the electrical conductivity significantly improved. The results show that the electrical conductivity of the SBR composite reinforced with 10 phr of CG and an additional 5 phr of MWCNTs surpasses that achieved by using 50 phr of CG solely. This enhancement can be attributed to the inherent excellent electric conductivity and high aspect ratio of MWCNTs, with their presence also preventing the re-agglomeration of CG. Furthermore, within 10–40 phr content of CG, the mechanical reinforcement of CG-SBR composites is enhanced with the addition of MWCNTs, whereas a minor decline in tensile strength is noted when the concentration of CG above 40 phr. Overall, the SBR composite reinforced with a synergistic combination of CG and MWCNTs is achieved, demonstrating both exceptional mechanical and conductive properties. Highlights Styrene butadiene rubber (SBR) composites with different cryptocrystalline graphite (CG) phr and additional multi-wall carbon nanotubes (MWCNTs) were characterized. CG-SBR displays good mechanical property but limited electrical conductivity. Proper ratio of CG/MWCNTs significantly enhances various properties. MWCNTs act as a “bridge” structure connecting isolated CG filler in SBR matrix. MWCNTs network effectively prevents the re-agglomeration of CG nanosheets.
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
RSC Advances
·
2016
·Vol. 6
·期 57
·51900-51907
·
IF 3.289
Kai Wu,Linyu Wu,Weixing Yang,Songgang Chai,Feng Chen,Qiang Fu
It has been demonstrated that introducing another non-conductive particle into conductive filler filled composites could result in a better conductivity due to a volume exclusion effect. It was also reported that combining electrically conductive fillers with different geometric shapes and aspect ratio together could enhance the electrical conductivity due to the synergistic effect. To further explore these two effects on the electrical property enhancement, we firstly encapsulated neat silica (SiO2) with graphene oxide (GO) through electrostatic self-assembly to render SiO2 with surface conductivity. Then neat SiO2 or SiO2@GO together with multi-walled carbon nanotubes (MWCNT) were mixed with polystyrene (PS) to prepare conductive composites. In this way, the volume exclusion effect in the PS/MWCNT/SiO2 system and combined effect of volume exclusion and synergy in the PS/MWCNT/SiO2@rGO system could be investigated and compared. An obvious increased conductivity was observed only in the transition composition region for the PS/MWCNT/SiO2 system compared with the PS/MWCNT system. However, a largely enhanced conductivity was achieved through the composition region for the PS/MWCNT/SiO2@rGO system compared with the PS/MWCNT/SiO2 system and PS/MWCNT, accompanied by great enhancement of the electromagnetic interference (EMI) shielding effectiveness. Given the SEM characterization and rheological properties, we attributed this obvious enhanced electrical property to both a volume exclusion effect and a synergistic effect.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Guiquan Liu,Guorong Wang,Xin Guo,Xuqiang Hao,Kai Wang,Zhiliang Jin
The poor ionic and electronic conductivities of pseudocapacitive materials are important constraints for the further development of supercapacitors . In this work, a new Se-NiAl-LDHs electrode material was successfully synthesized by a pre-synthetic solvothermal reaction and selenization modification procedure. On the basis of the NiAl-LDHs microstructure, partially new crystalline NiSe 2 selenides are surface-generated, and the resulting Se-NiAl-LDHs electrode material exhibits an impressive specific capacitance of 1098 F g −1 at a current density of 1 A g −1 . Furthermore, this newly synthesized Se-NiAl-LDHs electrode exhibits a good capacity retention of 60.47% at 20 A g −1 , which is superior to the outdated NiAl-LDHs electrode. Moreover, when the power density reaches 1593.17 W kg −1 , the energy density of the as-prepared soft-encapsulated Se-NiAl-LDHs//AC ASC is 29 Wh kg −1 . The focus of this work is to selenize the NiAl-LDHs microstructure so that the energy storage performance has been improvement due to the better energy storage, smaller electrochemical impedance, multiple oxidation states and more abundant chemical active sites after selenide treatment.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
B.L. Zhu,X.J. Cai,C.C. Wang,J. Wu,J.L. Yao,W.Q. Sun
Sb-doped SnO 2 (ATO) films were prepared with different RF powers ( P RF ) under two O 2 flow rates ( F O 2 ) by magnetron sputtering , and then subjected to rapid thermal annealing (RTA) treatment. The effects of P RF , F O 2 , and RTA on the crystallinity, stress, surface morphology , conductive properties, transmittance in visible-light range ( T Vis ), and energy gap ( E g ) of the films were investigated. As the P RF increases, the film crystallinity improves or first improves and then slightly degrades, and the compressive stress decreases. With increasing P RF , the surface changes from textured to granular morphology and from granular to honeycomb-like morphology under two F O 2 , respectively. Meanwhile, the conductive properties first enhance and then degrade, and the T Vis and E g tend to decrease, especially at higher P RF . Basically, the films prepared with higher F O 2 have lower compressive stress, inferior conductive properties, and larger T Vis and E g compared with the films prepared with lower F O 2 . After RTA, the film crystallinity obviously improves, the compressive stress transforms into tensile stress , and the surface morphology has not undergone significant changes. Meanwhile, the conductive properties significantly enhance and E g obviously increases. The T Vis of the films prepared with lower F O 2 can be increased by RTA. The influence mechanisms of the above factors on the structure and optoelectronic properties of the ATO films were explored, and ultimately, the ATO films have the T Vis of 76.35–80.86%, sheet resistance of 51.7–91.9 Ω/sq., and quality factor of 1.03–1.67 × 10 −3 Ω −1 within the optimized P RF range. Polymer-dispersed liquid crystal (PDLC) films were fabricated using optimized performance ATO films as electrodes, and their on-state transmittance, off-state transmittance, threshold electric field, and saturation electric field were 2.08–4.61%, 61.69–68.56%, 0.656–0.796 V/μm, and 1.68–2.108 V/μm, respectively. The current results indicate the potential application of ATO films in PDLC films as electrode.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jintang Luo,Tao Song,Tingting Han,Haisong Qi,Qunhua Liu,Thomas Rosenau
Simultaneously having competitive mechanical properties, fatigue-resistant stability, temperature adaptability, excellent conductivity and sensitivity has been a challenge in the design of acrylic-based conductive hydrogels if they are meant for application in electronic skin mimics capable of sensory and stimulus responses. In this work, an acrylic-based conductive hydrogel with both excellent mechanical and electrical properties was prepared based on an integrated strategy employing the multifunctionality of TEMPO-oxidized CNFs (TOCNFs) and metal ion interaction. The TOCNFs with their abundant –COOH groups played a key role in the hydrogel by a) well-dispersing polyacrylic acid (PAA) chains in the hydrogel to form a homogeneous and porous multi-network, b) furnishing more –COOH to interact with Fe 3+ , c) forming more hydrogen bonds with PAA and glycerol, and d) offering high modulus to the final hydrogel. The obtained optimal hydrogel showed competitive mechanical properties (0.88 MPa at 70 % compressive strain; 0.24 MPa at 873 % tensile strain) and fatigue-resistant properties (56.5 % strength retention after 500 cycles of 50 % compression; 51.7 % strength retention after 20 cycles of 200 % tensile), high electrical conductivity (2.45 S m −1 ) and sensitivity (GF up to 2.62 for tensile strains over 100 %), while still maintaining a high electrical conductivity (1.67 S m −1 ) at −25 °C. Accordingly, the hydrogel prepared in this work was able to act as an electronic skin that responds to temperature variations and detect human body movement of pressing, writing, stretching and bending with highly sensitive conductive signals, which endows it great potential for applications in humanoid robotics and multi-scenario strain sensing.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Lipei Yue,Xiaoyong Zhang,Yijing Wang,Weidong Li,Ying Tang,Yongping Bai
Synthetic conductive materials capable of self-healing have attracted increasing attention and have been developing rapidly because of their potential applications. Despite great achievements, there is a need to advance mechanical properties and reduce the time for healing simultaneously since the branch functionalities are limited and the polymer mobilities are poor in current devices. In this work, we report an effective and simple free radical polymerization approach to synthesize hydrogel using multi-vinyl-modified reduced graphene oxide (rGO) and acrylate monomers containing abundant polar groups. After enhanced by polar groups modified Cellulose Nanocrystal (CNC), the hydrogel exhibits extremely fast electronic self-healing ability and excellent repeatable restoration performance at 25 °C. The stress of hydrogel reaches 2.5 MPa and 1600% of elongation. The hydrogel recovers to its original mechanical and conductive properties within 12 s after cutting and maintains efficiency of nearly 99.3% of its original mechanical and conductive properties after 5 times of cutting and self-healing processes. The design of this conductive, room-temperature self-healing hydrogel takes unique advantage of supramolecular chemistry and polymer nanoscience and shed light on promising applications for self-healing electronics, artificial skins, soft robotics, biomimetic prostheses, and energy storage.
研究领域:
材料科学
·
高分子化学
·
仿生学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
·
2016
·
IF 0.901
Jiao Pan,Min Li,Shaokai Wang,Yizhuo Gu,Qingwen Li,Zuoguang Zhang
This paper successfully interlaced floating catalyst chemical vapor deposition-grown carbon nanotube film and ultrathin carbon fiber prepreg to achieve strong and flexible carbon nanotube/carbon fiber hybrid composites with high carbon nanotube loading. Epoxidation was also introduced to improve interlaminar interfacial bonding. It was found that pristine carbon nanotube film/carbon fiber interply hybrid composite (carbon fiber/carbon nanotube/carbon fiber) showed sudden and brittle failure, while epoxidation caused a gradual failure behavior. Hybrid effect analysis suggested that the improved tensile performance and synergistic effect of epoxidized carbon nanotube film/carbon fiber hybrid composite were attributed to good load transfer and suppressed delamination induced by improved interfacial bonding. In addition carbon fiber/carbon nanotube/carbon fiber manifested excellent damping capacity with the maximum loss factor of 0.13. The in-plane electrical conductivity of composite with global carbon nanotube content of 21 wt% increased to the same order of magnitude as carbon nanotube film composite. The excellent mechanical, damping, and electrical properties demonstrated great potential for both structural and multifunctional applications of the resultant hybrid composites.
研究领域:
材料科学
·
复合材料工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 5
·1-9
·
IF 2.8
Wang Haoyuan,Yang Luxi,Li Hengfeng
Field grading composites showing nonlinear conductive performance are usually applied to protection for electrical systems. In this work, polyetherimide (PEI) matrix composite films with field-dependent nonlinear conductive behavior were fabricated by using a typical type of transition metal dichalcogenides, MoS 2 as filler. The MoS 2 filled PEI composite film showed a nonlinear coefficient of 6.92 at a relatively low filler content of 15 phr, which is the percolation threshold of this kind of composite film. Nonlinear conductive behavior of the MoS 2 /PEI composites was driven by tunneling effect. Conductivity of the 20 phr of MoS 2 filled composite film increased for almost 3 magnitudes within 20 kV/mm. Enhanced dielectric constant was brought to PEI by the MoS 2 fillers. The PEI containing 20 phr of MoS 2 showed a dielectric constant of 6.1 at 1 kHz with dielectric loss still being low. This work revealed the potential of MoS 2 being adopted as filler of field grading composites.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yang Liu,Tingting Liu,Xiangchi Liu,Lu Xu,Baijun Liu,Mingyao Zhang
Monodispersed polystyrene-nickel (PS-Ni) composite microspheres were used to enhance the conductivity of epoxy-based anisotropic conductive adhesive (ACA) for the first time. Specifically designed PS-Ni composite microspheres were used as conductive elements to construct anisotropic conductive arrays. The surface microstructure and morphology of the prepared PS-Ni composite microspheres were tuned by controlling the implementation method of electroless plating and concentration of Ni precursor. The structural composition , thermal properties , and electrical properties of PS-Ni composite microspheres were analyzed. In addition, diglycidyl ether of bisphenol-A (DGEBA) epoxy resin and low molecular weight polyamide resin were used as the matrix resin and curing agent , respectively. The optimal process parameters were employed and predicted based on the curing kinetics. A simple strategy was developed for the preparation of anisotropic conductive binders (viz. PS-Ni/EP-ACAs) via physical doping by addition of terminal carboxyl-terminated butadiene acrylonitrile (CTBN) copolymer and additives. PS-Ni/EP-ACAs exhibited satisfactory anisotropic electrical properties in fabricated components due to submicron structures composed of PS-Ni composite microspheres with excellent integrated properties in the anisotropic conducting array. Therefore, the theoretical concept and fabrication mean proposed in this study showed great potential and practical application in large-scale ACAs preparation.
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
COMPOSITES SCIENCE AND TECHNOLOGY
·
2019
·
IF 6.309
Ting Huang,Chuan-Guo Ma,Pei-Bang Dai,Jian Zhang
The surface-modified hollow glass beads with reduced graphene oxide (rGO@HGB) were prepared by electrostatic self-assembly method and then blended with conductive carbon black (CB) and epoxy resin (EP), and were further used to prepare the CB/rGO@HGB/EP composites with segregated structure. Then microstructure, conductivity properties and dielectric properties of the composites were studied. The results show that rGO@HGB are excluded from the EP matrix, and CB particles are dispersed in the EP, forming a three-dimensional segregated percolation network in the CB/rGO@HGB/EP composites. rGO is coated on the surface of HGB to form a conductive bridge with the CB segregated conductive network, resulting in an efficient synergistic effect for improvement of conductive property and dielectric constant. Compared with CB/EP composites, the percolation threshold of CB/rGO@HGB/EP composites is significantly reduced to 0.08 vol%, and the electrical conductivity is greatly improved. The dielectric constant of 0.2 vol% CB/rGO@HGB/EP composites (600.27) at 1 kHz is 137 times higher than that of CB/EP composites (4.35), and the corresponding dielectric loss is only 0.08.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Haoyu Wu,Xiaojing Guo,Lu Gao,Tianchi Zhou,Zheng Niu,Xueqi Dong,Yongnan Zhou,Ziyin Li,Feng F. Hong,Jinli Qiao
Through the combinations of layer-by-layer method and double cross-linking process, OH – conducting membrane based on bacterial cellulose (BC) had been synthesized with the modification by Poly (diallyldimethyl-ammonium chloride) (PDDA) and Poly (vinyl alcohol) (PVA) of different molecular weights. Under the help of PVA, an enhanced internal three-dimensional network could be easily constructed to overcome the disadvantage of excessively loosely binding in the BC membrane. Charge carrier PDDA were confirmed by FTIR and SEM to be firmly embedded into the network while studies on XRD and DSC indicated that amorphous content which was beneficial to ionic transfer and ions hopping held the large proportion in the membrane. Stability measurements such as thermogravimetric analysis, mechanical properties, alkaline and oxygen resistance were carried out, showing that the prepared membranes possessed excellent durable performance under various extreme conditions. Moreover, OH – conductivity and water uptake were intensively investigated by changing crosslinking conditions, KOH concentrations and PVA molecular weights. Achieving the maximum σ OH − of 72.95 mS cm −1 at room temperature, the LPVA-PDDA-BC-OH – membrane showed the lowest calculated activation energy value of 10.211 KJ mol −1 , indicating that both Grotthus and vehicle mechanisms played an important role on ionic transportation. When as-prepared LPVA-PDDA-BC-OH – membrane was applied for CO 2 electrochemical reduction (CO 2 ER) in 0.5 M KHCO 3 , current density could reach up to 47.44 mA cm −2 at −1.06 V RHE . Meanwhile, Faradaic efficiency for formate (FE HCOO − ) could achieve the maximum value of 67.89 % that dampened only 7.09 % after 20 h electrolysis. Furthermore, when as-prepared LPVA-PDDA-BC-OH – membrane was assembled into the flexible zinc-air batteries (F-ZAB), excellent power density of 130.3 mW cm −2 could be obtained at room temperature.
研究领域:
材料科学
·
电化学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）