POLYMER
·
2021
·
IF 4.43
Shuang-Man Xie,Xing Zhao,Li-Mei Peng,Peng Yu,Xiang-Jun Zha,Kai Ke,Rui-Ying Bao,Ming-Bo Yang,Wei Yang
Liquid metal (LM) based stretchable conductors have broad application due to their excellent conductivity and deformability. However, the poor interfacial interaction between LM and majority of elastic substrates because of the high surface tension of LM, limits the spread of LM on the substrate and the reconciliatory deformation of LM with underlying substrate. Herein, through the specific affinity between the immediately formed oxide layer on surface of eutectic gallium-indium (EGaIn) and carboxyl groups, an in-situ interfacial engineering for LM conductive coating on hydrogen-bonded poly(ethylene oxide)/poly(acrylic acid) (PEO/PAA) elastomers is presented. Particularly, EGaIn patterned on PEO/PAA elastomers can autonomously adapt to the mechanical deformation of substrates to form a stable interface conductive layer, and the slope of deformation ratio between EGaIn layer and PEO/PAA elastomers keeps nearly 1 even at strain of 800%. The design of interfacial interaction also ensures the simultaneous achievement of excellent stretchability and stable conductivity of LM based stretchable electronics, that is, the resistance of the EGaIn conductor will not change significantly and remain below 1 Ω even at a strain of 800%. This work provides guideline for the design of stretchable LM-based conductor.
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 APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 7
·e53468
·
IF 3.057
Fanan Wei,Tuanjie Duan,Ligang Yao,Wenguang Yang
Conductive hydrogel has broad potential applications in wearable sensors and flexible electronic devices. However, due to the complicated and restrictive mold-casting process, the manufacture of hydrogel-based sensors is still facing great challenges. In this paper, we adopt direct inkjet printing (DIW) technology to fabricate three-dimensional structures of chemically and physically cross-linked hydrogels by integrating fumed silica as a rheological modifier into crosslinked poly(vinyl alcohol)/poly(acrylamide) (PVA/PAAm) network. Fumed silica not only enables hydrogels with excellent rheological properties, but also provides more hydrogen bond crosslinking sites, further improving mechanical properties. Meanwhile, calcium chloride (CaCl 2 ) is supplemented to construct conductive channels in the hydrogel, which powers the hydrogel with good conductivity and strain sensitivity. The sensor assembled from 3D printed hydrogel shows cycle stability and accurate recognition ability in detecting mechanical deformation and various human movements (for example knee bending and frown). This work extends the application of 3D printing hydrogel in the field of wearable devices.
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
Energy Storage Materials
·
2022
·
IF 20.831
Chong Bai,Kang Ji,Shuxuan Feng,Jiaxue Zhang,Desheng Kong
Stretchable batteries are indispensable energy storage devices to power emerging wearable electronics in soft form factors. In contrast to commonly employed engineering approaches to mitigate strains through structural design, the intrinsically stretchable devices naturally exhibit skin-like mechanical deformability by using all compliant building components. Currently, the intrinsically stretchable battery often shows a significant trade-off between electrochemical performances and mechanical deformability. Here, we introduce a low-cost and scalable approach to create an intrinsically stretchable aqueous battery featuring the deployment of state-of-art battery materials and binders. The compliant current collector, in the form of a bilayer silver nanowire/carbon nanotube nanocomposites, demonstrates excellent mechanical stretchability and electrochemical stability. The microcracked electrode layer retains stable charge transport and excellent electrochemical activity under large mechanical deformations through firm attachment to the bilayer current collector. A stretchable Zn-MnO 2 cell in a sandwiched configuration is assembled exhibiting high specific capacity (>200 mAh g −1 at 100 mA g −1 ), excellent capacity retention of ∼90% over 100 cycles, large stretchability up to 100% strain, and durability against repetitive mechanical deformations. The practical suitability is demonstrated by a stand-alone electronic system conformably mounted on the wrist, in which an LED array is powered by a pair of stretchable Zn-MnO 2 batteries.
研究领域:
材料科学
·
能源存储
·
可穿戴设备
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Shuwei Wang,Guo Li,Zhaotie Liu,Zhongwen Liu,Jinqiang Jiang,Yue Zhao
Shape transformation of polymeric materials, including hydrogels, liquid crystalline, and semicrystalline polymers, can be realized by exposing the shape-changing materials to the effect of a variety of stimuli such as temperature, light, pH, and magnetic and electric fields. Herein, we demonstrate a novel and different approach that allows a flat sheet or strip of a polymer to transform into a predesigned 3D shape or structure by simply stretching the polymer at room temperature and then releasing it from the external stress, that is, a 2D-to-3D shape change is activated by mechanical deformation under ambient conditions. This particular type of stimuli-controlled shape-changing polymers is based on suppressing plastic deformation in selected regions of the flat polymer sheet prior to stretching and release. We validated the design principle by using a polymer blend composed of poly(ethylene oxide) (PEO), poly(acrylic acid) (PAA), and tannic acid (TA) whose plastic deformation can be locally inhibited by surface treatment using an aqueous solution of copper sulfate pentahydrate (Cu2+ ink) that cross-links PAA chains through a Cu2+–carboxylate coordination and, consequently, increases the material’s Young’s modulus and yield strength. After room temperature stretching and release, elastic deformation in the Cu2+ ink-treated regions leads to 3D shape transformation that is controlled by the patterned surface treatment. This facile and effective “stretch-and-release” approach widens the scope of preparation and application for shape-changing polymers.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
PubMed
高影响因子
CARBON
·
2021
·
IF 9.594
Weihong Huang,Yarong Wang,Yiming Zhang,Jiahao Zhu,Dexing Liu,Jiaxin Wang,Lingchong Fan,Rui Qiu,Min Zhang
Stretchable synaptic transistors with the ability to emulate multiplexed neural signal transmission is an important step toward mimicking complex brain activities in bionic memory sensors, intelligent soft robots , and skin electronics. The reports about stretchable artificial synaptic transistors are very limited and further exploration is urgently required. In this work, intrinsically stretchable carbon nanotube synaptic transistors (IS-CNT-STs) with poly (urea-urethane) dielectric have been realized. The synaptic characteristics and the synaptic mechanism have been analysed. Synaptic functions of the biological synapses including excitatory and inhibitory behaviours, short-term plasticity, and filtering characteristic are successfully emulated in the IS-CNT-STs. Moreover, the IS-CNT-STs have exhibited excellent mechanical stretchability even after experiencing large stretching deformation. After stretched by 50% strain, and even after 400 stretching cycles by 25% strain, both the transistor characteristics and the synaptic functions remain correctly. The realized IS-CNT-STs possess low operating voltage, multiple synaptic plasticity, and mechanical deformation response. The demonstrations indicate their capability to work in the stretchable artificial neuromorphic systems .
研究领域:
生物医学工程
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材料科学
·
神经形态计算
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Shengqu Liu,Yuehui Zhong,Xiaoling Zhang,Menghan Pi,Xiaoyu Wang,Ruijie Zhu,Wei Cui,Rong Ran
Developing flexible energy storage devices with the ability to retain capacitance under extreme deformation is promising but remains challenging. Here, we report the development of a durable supercapacitor with remarkable capacitance retention under mechanical deformation by utilizing a physical double-network (DN) hydrogel as an electrolyte. The first network is hydrophobically associating polyacrylamide cross-linked by nanoparticles, and the second network is Zn2+ cross-linked alginate. Through soaking such a DN hydrogel into a high concentration of ZnSO4 solution, a highly deformable electrolyte with good conductivity is fabricated, which also shows adhesion to diverse surfaces. Directly attaching the hydrogel electrolyte to two pieces of an active carbon cloth facilely produces a flexible supercapacitor with a high specific capacitance and theoretical energy density. Remarkable capacitance retention under tension, compression, and bending is observed for the supercapacitor, which can also maintain above 87% of the initial capacitance after 4000 charge–discharge cycles. This study provides a simple way to fabricate hydrogel electrolytes for deformable yet durable supercapacitors, which is expected to inspire the development of next-generation flexible energy storage devices.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Intelligent Systems
·
2022
·Vol. 4
·期 9
·2200089
·
IF 7.298
Zhaojia Sun,Shuyu Wang,Yuliang Zhao,Zhitao Zhong,Lei Zuo
Multimodal sensing is crucial for soft robots’ environmental interaction and closed-loop control. The sensing signals of mechanical deformation and temperature changes are often hard to differentiate manually. Herein, two hydrogel sensors are used for simultaneously proprioceptive, thermoceptive, and mechanoreceptive sensing. These stretchable sensors show high sensitivity to strain and temperature changes. Then, a machine learning model composed of a 1D convolutional neural network and a feed-forward neural network is utilized to decode the sensing signal for various stimuli identification. It is demonstrated that the proposed method can accurately predict the soft actuator's body posture changes, such as bending, twisting, and stretching. In addition, the model can discern contact events with or without thermal stimuli. This data-driven method for multimodal sensing discrimination might pave the way for future intelligent soft robots.
研究领域:
机器人学
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材料科学
·
人工智能
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xiaojing Lv,Haofei Xu,Yuanyuan Yang,Mi Ouyang,Minao Xia,Chunyan Liu,Dominic S. Wright,Cheng Zhang
A flexible laterally-configured electrochromic supercapacitor was designed and fabricated through a fully-solution process. The laterally-configured transparent conductive electrode PEDOT:PSS-AgNWs/PET was prepared by spraying technology and then the magenta electrochromic polymer (PProDOT) and gel electrolyte were cast sequentially onto the laterally-configured electrode. The as-prepared device exhibits alternative color changes between magenta and transparent within the potential range −0.9 V and 0.9 V, and the electrochromic behavior is retained even if bent, proving its excellent flexible display properties. As expected, a “ZJUT” patterned flexible display device works clearly when applying driving potentials to the two circuits simultaneously. In addition, the asymmetric device (PProDOT||PEDOT:PSS) integrates excellent electrochromic and electrochemical energy storage properties in terms of high optical contrast of 59.5 %, large coloration efficiency of 423.5 cm 2 ·C −1 , fast switching time (7.4 s and 3.9 s), reasonable areal capacitance of 2.15 mF/cm 2 at a current density of 0.05 mA/cm 2 and robust cyclic stability which can retain 85.65 % and 77.42 % of its initial optical contrast and capacitance even after 1000 cycles of mechanical deformation. Hence, this work demonstrates the flexible laterally-configured electrochromic supercapacitor has great potential in the portable and wearable display fields, such as smart watches and electronic paper.
研究领域:
材料科学
·
能源存储与转换
·
显示技术
✓ 已验证
产品关联
DOI
高影响因子
Cell Reports Physical Science
·
2022
·
IF 7.832
Juanjuan Yin,Kuo Wei,Jiaxin Zhang,Shide Liu,Xinliang Wang,Xiaoming Wang,Qingrui Zhang,Zhihui Qin,Tifeng Jiao
The fabrication of a flexible all-solid supercapacitor able to work under various deformations, even under extreme conditions, remains challenging because of the rigidity of electrodes, the freezing of gel electrolytes, and interfacial contact problems. Here, we report a flexible supercapacitor with excellent mechanical deformation and ultra-low temperature tolerance assembled by using the designed MXene/carboxymethyl cellulose film electrode and all-round polyvinyl alcohol/LiCl (PVA/LiCl) hydrogel electrolyte. The supercapacitor combines mechanically flexible (12.7 MPa at 5.9% strain) and highly conductive (267 S/cm) electrodes with the PVA/LiCl hydrogel electrolyte with high ion conductivity, excellent mechanical properties, self-adhesion, and antifreezing ability. As a result, the assembled supercapacitor exhibits a high specific capacitance (113.13 mF cm −2 ) with a retention of ∼95% under mechanical deformations, and more importantly, the electrochemical stability can be maintained even at −40°C when subjected to severe deformations. This work offers an option to design flexible supercapacitors as environment-adaptable energy-storage devices.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Kanjun Sun,Enke Feng,Guohu Zhao,Hui Peng,Ganggang Wei,Yaya Lv,Guofu Ma
Integrated configuration can greatly improve the stability of an energy-storage device in a large or repeated mechanical deformation process, but there is little attention paid to develop this conceptual energy-storage device. Here, we successfully design two embedded polypyrrole (PPy) layers as electrodes and a boron cross-linked PVA(poly(vinyl alcohol))/KCl hydrogel film as electrolyte to construct an integrated electrode–electrolyte–electrode flexible supercapacitor (so-called all-in-one supercapacitor). The boron cross-linked PVA/KCl hydrogel film (B-PVA/KCl) is prepared by simple physical and chemical cross-linking methods. Then, the conducting PPy is embedded in the B-PVA/KCl film by in situ growth to form a PPy/B-PVA/KCl composite film, which shows superior toughness and strength when it undergo large deformations, such as stretch, twist and compression. The integrated flexible supercapacitor can obtain a large areal capacitance of 224 mF cm–2 and a remarkable energy density of 20 μWh cm–2. Furthermore, such device exhibits excellent electrochemical stability under various bending angles (0°, 90°, and 180°) or 500 bending-releasing cycles, which due to the integrated electrode–electrolyte–electrode configuration can avoid the fall-off of electrode materials from the substrates and overcome the relative displacement between electrode and electrolyte layers during the consecutive bending cycles.
研究领域:
材料科学
·
电化学
·
能量存储
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 33
·期 11
·2210961
·
IF 19.924
Yongyu Lu,Dehai Yu,Haoxuan Dong,Sen Chen,He Zhou,Lichen Wang,Zhongshan Deng,Zhizhu He,Jing Liu
Leakage is a significant issue that prevents the widespread application of liquid metals (LMs) and an effective solution has not yet been developed. One potential solution is to use the high surface tension of LMs to encapsulate them in a porous material. However, it is challenging as it is difficult to infuse LMs into tiny pores. This study proposes a bottom-up strategy where LMs are doped with NdFeB@Ag particles, which are then magnetized to form a tight porous structure. This structure is robust and resistant to collapse under mechanical deformation. Therefore, LMs can be reliably immobilized within the pores between the particles, and a dynamic leakage-free state is achieved. The encapsulated LMs demonstrate excellent properties including a large latent heat of 153.46 J cm −3 , high thermal conductivity of 35.62 W m −1 K −1 , and enhanced electrical conductivity of 69.61%, which efficiently extends their functional scope and potential value.
研究领域:
材料科学
·
工程学
·
热能工程
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2021
·Vol. 36
·期 9
·1835-1845
·
IF 3.089
Chen Changsong,Wu Yihua,Zhu Zhi-Gang,Shih Wan Y.,Shih Wei-Heng
Abstract All-inorganic perovskite materials have many advantages such as adjustable emission range, narrow emission peaks, and good crystallinity, which have attracted widespread interest. They can be used as solar cells, LEDs, photodetectors, displays, and other optoelectronic devices. However, poor environmental stability is the major factor limiting its applications. We introduced a Poly(styrene-ethylene-butylene-styrene) SEBS polymer to create perovskite/SEBS composite films which have excellent stability even in the water environment. Besides, due to the elastic nature of SEBS, the composite films exhibited good mechanical deformability and could maintain most of its fluorescence intensity after being stretched hundreds of times. A WLED device was constructed by stacking CsPbBr 3 /SEBS films and CsPbI 3 /SEBS films over a blue LED. The WLED performed well with color rendering index of 82.6 with chromaticity coordination (0.35, 0.36) and color temperature 4784 K. Graphic Abstract
In order to create a stable and flexible photoluminescent material, we combined a
poly(styrene-ethylene-butylene-styrene) (SEBS) polymer and cesium lead-halide
nanocrystals forming a flexible photoluminescent composite. The composite films
show both good environment stability and excellent flexibility.
研究领域:
材料科学
·
光电技术
·
纳米技术
·
光子学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）