CHEMISTRY-A EUROPEAN JOURNAL
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2024
·Vol. 30
·期 40
·e202400537
·
IF 3.9
Jifeng Chen,Hui Xu,Zhu Mao,Kaixuan Nie,Yi Ning,Zhongyu Li,Bo Tian,Zhibo Sun,Pengli Zhu,Rong Sun
Graphical Thermally conductive epoxies with self-healing ability will be widely used in flexible electronic materials in the future. In this paper, alkyl chains of different lengths were introduced to epoxies for discussing the thermally conductive, the self-healing performance, and the synergistic effect. and the epoxies suitable for flexible electronic device can be prepared by adjusting the length of alkyl chains. With the popularization of 5G technology and artificial intelligence, thermally conductive epoxies with self-healing ability will be widely used in flexible electronic materials. Although many compounds containing both performances have been synthesized, there is little systematic theory to explain the coordination mechanism. In this paper, alkyl chains of different lengths were introduced to epoxies to discuss the thermally conductive, the self-healing performance, and the synergistic effect. A series of electronic-grade biphenyl epoxies (4,4′-bis(oxiran-2-ylmethoxy)-1,1′-biphenyl ( 1 ), 4,4′-bis(2-(oxiran-2-yl)ethoxy)-1,1′-biphenyl ( 2 ), 4,4′-bis(3-(oxiran-2-yl)propoxy)-1,1′-biphenyl ( 3 ), and 4,4′-bis(4-(oxiran-2-yl)butoxy)-1,1′-biphenyl ( 4 ) were synthesized and characterized. Furthermore, they were cured with decanedioic acid to produce polymers. Results showed that alkyl chains can both affect the two properties, and the epoxies suitable for specific application scenarios can be prepared by adjusting the length of alkyl chains. In terms of thermal conductivity, compound 1 was a most promising material. However, compound 4 was expected to be utilized in flexible electronic devices because of its acceptable thermal conductivity, self-healing ability, transparency, and flexibility.
研究领域:
材料科学
·
化学工程
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DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Youjie Rong,Xiaomin Zhang,Huijie Li,Jianhua Fei,Ruiqiang Hang,Xiangyu Zhang,Xiaobo Huang,Xiaohong Yao
Flexible polymer molecular chains are of great interest to researchers in the field of flexible wearable electronics due to their unrivaled flexibility and ductility. However, achieving high toughness, high elasticity, environmental stability and easy machining of flexible electronic materials remains a challenge. In this study, we present a photocurable eutectic gel mainly composed of DMAPS, AAc, Zr 4+ and deep eutectic solvents (DES). Due to the strong coordination between zirconium ions and polymer networks, the gel can be endowed with excellent properties, such as excellent tensile strength (1.14 MPa), low hysteresis (5 kJ·m −3 ) and good adhesion (above 40 kPa). DES can not only give the gel good electrical conductivity, but also maintain the stability of the gel to ensure that the leakage or volatilization of the solvent will not occur in use. The properties mentioned above allow the gel to achieve a sensitivity factor of up to 1.7 over a small strain range, demonstrating its potential applications in the field of flexible strain sensors and triboelectric flexible electrode materials. What’s more, the gel can be used to prepare complex geometric shapes with high precision through digital light processing (DLP) based 3D printing technology. Therefore, this work introduces a novel approach for the development of highly stable flexible wearable devices, which has the potential to expand the applications of eutectic gels.
研究领域:
材料科学
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柔性电子
·
传感技术
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Xianfeng Wu,Kai Wang,Junyu Lin,Dan Yan,Zhiyong Guo,Hongbing Zhan
A metal–organic framework (MOF) thin film constructed from Zn nodes and naphthalenediimide (NDI) linkers was grown in-situ uniformly on a transparent conducting glass substrate . This transparent thin film exhibits intriguingly high-contrast electrochromic (EC) switching between canary yellow and dark brown by means of a one-electron redox reaction at its NDI linkers. The findings provide a basic comprehension of the relations between redox state and electrochromism and enrich the application of MOF in the field of optoelectronic materials.
研究领域:
材料科学
·
电化学
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Shuangfei Xiang,Feng Zheng,Shuangshuang Chen,Qinghua Lu
Flexible electronic materials have aroused significant interest due to the need for flexible electronics in a variety of applications. However, several obstacles such as low mechanical properties, interfacial adhesion problems, and nonreusability hinder their rapid development. Here, an ionogel was developed by a one-step photopolymerization of an ionic liquid (IL) with the C═C bond of 1-vinyl-3-butylimidazolium tetrafluoroborate in another ionic liquid solution of 1-butyl-3-methylimidazolium tetrafluoroborate without a chemical cross-linker. The poly(ionic liquid) and the ionic liquid (PIL/IL) were highly compatible and resulted in an extremely uniform, stable, and optically transparent PIL/IL ionogel. In addition, this method also avoided complicated solvent replacement in the preparation processes of common ionogels. Our experimental and theoretical results showed that the reported ionogel integrated excellent mechanical properties, ultrastrong adhesive, self-healability, and recyclability. These remarkable advantages were benefited from the strong electrostatic force and other noncovalent bond interactions in the ionogel system. The unique ionogel presented in this study is therefore an ideal candidate material for self-adhesive and reusable wearable electronics.
研究领域:
材料科学
·
柔性电子学
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DOI
PubMed
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2025
·
IF 4.3
Hui Tong,Ziwei Pan,Xie Fu,Yulong Zhou,Xia Zhang,Kun Zhang,Shuai Kang,Jinling Luo,Wenqiang Lu,Lyes Douadji
As a recent focal point of research, soft electronics encompass various factors that synergistically enhance their mechanical properties and ensure stable electrical performance. However, challenges such as immiscible conductive fillers, poor phase interfaces, and unstable conductive networks hinder the overall efficacy of these materials. To address these issues, a hydrogel featuring an oriented interpenetrating network structure (OIPN) is developed. The pyrrole monomer is in situ polymerized within the confined space of PVA macromolecular chains at low temperatures, resulting in a double network structure. Subsequently, the conductive hydrogel with an OIPN configuration is synthesized through directional freezing combined with salting out techniques. After doping phytic acid (IP6), non-covalent bonds dynamically reinforce the dual network architecture and the pathways for conductivity transfer. Due to its distinctive OIPN structure, the hydrogel containing 50% PPy and 2.3% IP6 exhibits remarkable conductivity (75 µs mm −1 ), excellent stretchability (400%), optimal multi-stimuli sensing responses (mechanical and gaseous stimuli), and outstanding device stability (over 2600 cycles at 40% strain). This multifunctional hydrogel presents a promising strategy for advancing applications in soft electronic materials.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
Polymers
·
2025
·Vol. 17
·期 9
·1187
·
IF 4.9
Ao Liu,Linlin Ouyang,Depeng Gong,Chaocan Zhang
To enhance the high-temperature resistance of silicone rubber and meet the application requirements of flexible conductive silicone rubber under elevated temperature conditions, this study adopts a chemical modification strategy by introducing phenyl groups into the molecular chains of silicone rubber to improve its thermal resistance. High-phenyl-content hydroxyl-terminated silicone oil (MPPS) was used as the polymer backbone, and vinylmethyldimethoxysilane (VDMS) served as the chain extender. Through a silanol condensation reaction, vinylmethylphenyl polysiloxane (VMPPS) with a crosslinkable structure was synthesized, providing reactive sites for subsequent vulcanization and molding. Subsequently, needle-like silver-coated glass fiber (AGF) conductive fillers were prepared via a green and environmentally friendly electroless silver plating method. These fillers were incorporated into the phenyl polysiloxane matrix to impart electrical conductivity to the phenyl silicone rubber while synergistically enhancing its thermal resistance. Finally, thermally resistant conductive silicone rubber was fabricated through high-temperature vulcanization, and the key properties of the material were systematically characterized. The synthesized phenyl polysiloxane exhibited a number-averaged molecular weight of up to 181,136, with a PDI of 2.43. When the loading of AGF reached 25 phr, the phenyl silicone rubber composite achieved the electrical percolation threshold, exhibiting a conductivity of 7.12 S/cm. With a further increase in AGF content to 35 phr, the composite demonstrated excellent thermal stability, with a 5% weight loss temperature of 478 °C and a residual mass of 37.36% at 800 °C. Moreover, after thermal aging at 100 °C for 72 h, the conductivity degradation of the phenyl silicone rubber was significantly lower than that of commercial silicone rubber, indicating outstanding electrical stability. This study provides an effective approach for the application of flexible electronic materials under extreme thermal environments.
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2024
·Vol. 16
·期 47
·22021-22028
·
IF 5.8
Yan Wang,Weiqiang Liao,Xikai Yang,Kexin Wang,Shengpeng Yuan,Dan Liu,Cheng Liu,Shiman Yang,Li Wang
Wearable verbal language servers function as sophisticated and effective tools for fostering intelligent interactions between humans and machines. In the realm of collecting acoustic vibration signals, flexible iontronic pressure sensors have demonstrated their efficacy by incorporating microstructures into the functional layer, resulting in heightened pressure sensitivity. However, the substantial viscosity of the integrated iontronic materials or the lack of bonding at the heterogeneous interface emerges as a significant hindrance to capacitance recovery, leading to sluggish response speeds and mechanical instability. Here, we address the issue by introducing hydrogen bonding between naturally microstructured protein micro-fibers and hydrophilic ionic hydrogel into the dielectric layer. Due to the good resilience of protein micro-fibers and the enahnced interfacial bonding, this flexible vibration sensor demonstrates outstanding performance characteristics, featuring exceptional signal stability, a high-pressure resolution of 522 pF kPa−1, an ultra-fast response time of 0.6 ms, and a relaxation time of 0.6 ms, with a limit of detection (LOD) of 0.12 Pa, making it well-suited for acoustic vibration acquisition. By using a one-dimensional convolutional neural network (1D-CNN) deep learning to process and recognize collected acoustic signals, our sensor achieved an impressive accuracy of 98.2%. These wearable vibration sensors exemplify promising versatile applications in biometric authentication, personalized services, and human-computer interaction.
研究领域:
生物医学工程
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材料科学
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人工智能
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DOI
PubMed
高影响因子
Materials Research Express
·
2019
·Vol. 7
·期 1
·015007
·
IF 1.449
Pengdong Feng,Mao Zhong,Weiwei Zhao
Next generation wearable electronics require stretchable dielectrics. There has been significant effort to characterize and improve the components of dielectric composites for use in these devices. In this work, a new stretchable dielectric material, composited by silver nanoparticles (Ag NPs), nickel nanoparticles (Ni NPs), and polydimethylsiloxane (PDMS), is prepared and characterized. The alternating arrays of Ag NPs groups and Ni NPs groups in the three-dimensional matrix of PDMS function as micro capacitors and prevent current percolation. Compared with PDMS alone, the alternating arrays exhibit a dielectric constant (k) that is increased by 1146% and can reach 35.13, with dielectric loss as low as 0.009. Slightly lower k and larger dielectric loss appear at high frequencies. The material exhibits negative temperature dependence, and the composition ratio affects the dielectric properties. The strain at break is 139.68% and the elastic modulus is as low as 3.57 kPa. By controlling the type, size and dispersion of metal nanoparticles in PDMS matrix, a parallel-plate capacitor with constant capacitance is achieved, demonstrating the dependence of the dielectric constant on the applied strain. Moreover, by replacing the parallel plates with cylindrical fibers, a capacitive strain sensor was demonstrated. After hundreds of stretching-releasing cycles, the dielectrics work normally. The excellent properties of this material suggest its significant potential for use in wearable electronics.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 15
·8038-8047
·
IF 11.9
Bingyan Guo,Yukuan Wu,Shaoshuai He,Changyong Wang,Mengmeng Yao,Qingyu Yu,Xiaojun Wu,Chaojie Yu,Min Liu,Lei Liang,Zhongming Zhao,Yuwei Qiu,Fanglian Yao,Hong Zhang,Junjie Li
In the field of flexible electronic devices, conductive hydrogels have attracted great attention. However, it is difficult for existing hydrogel materials to realize excellent mechanical properties and high electrical conductivity simultaneously. To address this issue, this study proposes a facile method for producing super-strong conductive hydrogels via mechanical stretching combined with the Hofmeister effect. The anisotropic hydrogels possess highly anisotropic structures, which provide anisotropic mechanical properties and electrical conductivity. The prepared anisotropic hydrogels exhibit a combination of high strength (16.57 MPa), ultra-high toughness (39.23 MJ m−3), and high conductivity (0.38 S m−1), which are better than those of the anisotropic hydrogel along the vertical stretching direction and the isotropic hydrogel. And thus, the anisotropic hydrogels achieve a remarkable gauge factor (GF = 1.17). The anisotropic hydrogels demonstrate superior capabilities in human motion sensing. The excellent mechanical properties and high conductivity of anisotropic hydrogels make them a potential candidate for flexible electronic materials.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xiangdong Wang,Xiaoyu Wang,Menghan Pi,Rong Ran
High conductivity, high strength and stretchability are important characteristics of flexible electronic materials. However, it is still a challenge that balancing the electrical conductivity and mechanical strength of materials. This paper proposes a simple method to embed hydroxyethyl cellulose (HEC) into polyvinyl alcohol (PVA) hydrogel to form large pores that can adsorb ions. The conductivity of the hydrogel immersed in the sodium chloride solution can reach 5.77 S/m, and the strength can reach 2.86 MPa when the strain is 400.30%. Then the hydrogel is soaked in a sodium chloride glycerin aqueous solution to prepare PVA-HEC organic hydrogel (PHOH) with both high strength and high conductivity at −30 and 65 °C. In order to meet the requirements of multiple sensors in the future, we added temperature-sensitive particles into the system to prepare fibers, which are used as woven temperature-sensitive conductive materials. Finally, we prepared a green energy source triboelectric nanogenerator (TENG) by the PHOH. This strategy is conducive to the self-powering, miniaturization and intelligence of flexible electronic materials.
研究领域:
材料科学
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生物医学工程
·
柔性电子学
✓ 已验证
产品关联
DOI
高影响因子
Aggregate
·
2022
·Vol. 4
·期 1
·e249
·
IF 0
Le Yao,Xiaoqing Ming,Chengjiang Lin,Xiaozheng Duan,He Zhu,Shiping Zhu,Qi Zhang
Developing smart iontronic materials is highly desired for eradicating the widely occurring potential short-circuit hazard and subsequent safety problems caused by high ambient humidity. In this work, a humidity-responsive ionogel (HRIG) based on a poly(benzyl methacrylate) matrix swollen by hydrophobic ionic liquid and hygroscopic lithium salt is reported. The HRIG exhibits an anomalous decrease in ionic conductivity upon hydration by increased humidity, totally differing from traditional ionic conductors, which are usually more conductive due to the plasticizing effect of water molecules. This unique ionogel shows a dramatic decrease in ionic conductivity (as much as 10 2 ) when exposed to humidity. The conductive pathway within the HRIG would be shut down spontaneously above a critical relative humidity due to water-induced phase separation. Moreover, this transition can be perfectly reversed when the ambient humidity drops. A humidity-responsive smart supercapacitor that can be switched on and off by capturing humidity changes is designed for demonstration. It is believed that such unusual HRIG material will provide new insights into the development and applications of smart iontronics.
研究领域:
材料科学
·
离子电子学
✓ 已验证
DOI
FOOD CHEMISTRY
·
2024
·
IF 8.5
Hua Wang,Lin Hao,Yaxing Guo,Chun Wang,Qiuhua Wu,Zhi Wang
Porous electron-rich organic frameworks have attracted an increased attention in the adsorption and removal of pollutants due to their abundant electron-rich nitrogen atoms, which can effectively interact with positively charged substance. In this study, a porous electron-rich organic framework (Car-POF) and positively charged amino-functionalized magnetic nanoparticles (Fe 3 O 4 -NH 2 ) were used to construct a magnetic electron-rich Fe 3 O 4 -NH 2 @Car-POF for the enrichment of some phenylurea herbicides from water and milk samples prior to high performance liquid chromatographic detection. The adsorption capacity of Fe 3 O 4 -NH 2 @Car-POF for the phenylureas ranged from 14.93 to 28.83 mg g −1 . The LODs were observed in the range of 0.05–0.20 ng mL −1 and 0.5–1.5 ng mL −1 , and LOQs in the range of 0.17–0.66 ng mL −1 and 1.7–5.0 ng mL −1 for water and milk samples with RSD less than 9.0. The adsorption studies with cationic and anionic dyes revealed that Fe 3 O 4 -NH 2 @Car-POF is favorable for the adsorption of positively charged compounds.
研究领域:
环境科学
·
分析化学
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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）