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1.
Qian Yan Renjie Ding Haowen Zheng Pengyang Li Zonglin Liu Zhong Chen Jinhua Xiong Fuhua Xue Xu Zhao Qingyu Peng Xiaodong He 《Advanced functional materials》2023,33(34):2301982
Near-infrared (NIR) light-responsive hydrogels have the advantages of high precision, remote control and excellent biocompatibility, which are widely used in soft biomimetic actuators. The process by which water molecules diffuse can directly affect the deformation of hydrogel. Therefore, it remains a serious challenge to improve the response speed of hydrogel actuator. Herein, an anisotropic photo-responsive conductive hydrogel is designed by a directional freezing method. Due to the anisotropy of the MXene-based PNIPAM/MXene directional (PMD) hydrogel, its mechanical properties and conductivity are enhanced in a specific direction. At the same time, with the presence of the internal directional channels and the assistance of capillary force, the PMD hydrogel can achieve a volume deswelling of 70% in 2 s under light irradiation, further building a hydrogel actuator with a fast response performance. Additionally, the hydrogel actuator can lift an object 40 times its weight by a distance of 6 mm, realizing the advantages of both rapid responsiveness and high driving strength, which makes the hydrogel actuator have important application significance in remote control, microflow valve, and soft robot. 相似文献
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Yaoxun Zhang Xin Jing Jian Zou Peiyong Feng Gangrong Wang Jiazhou Zeng Liya Lin Yuejun Liu Hao-Yang Mi Shanshan Nie 《Advanced functional materials》2024,34(52):2410698
The intricate muscle arrangement structure endows the biological tissues with unique mechanical properties. Inspired by that, a mechanically robust and multifunctional anisotropic Polyacrylamide/Sodium alginate/Zirconium ion/Carbon dots (PAM/SA/Zr4+/CDs, PSZC) hydrogel is developed through the synergistic effect of mechanical-assisted stretching, Zr4+ metal-coordination and CDs embedding. The resulting hydrogel exhibited an impressive tensile strength of 2.56 MPa and exceptional toughness of 10.10 MJ m−3 along the stretching direction, attributing to the oriented alignment of PAM and SA molecular chains induced by mechanical-assisted stretching and metal-coordination. The dense network structure endowed the PSZC hydrogel with excellent anti-swelling performance, achieving a swelling ratio of only 1.7% after being stored in water for 30 days. The presence of Zr4+ conferred remarkable electrical conductivity of 2.15 S m−1 to the PSZC hydrogel. Furthermore, the integration of carbon dots imparted the PSZC hydrogel fluorescence properties, rendering it visual sensing capabilities. Overall, a straightforward strategy is proposed for fabricating a mechanically robust and multifunctional hydrogel suitable for underwater sensing and visual sensing, offering valuable insights for the development of high-performance underwater sensors. 相似文献
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Highly conductive and stretchable fibers are crucial components of wearable electronics systems. Excellent electrical conductivity, stretchability, and wearability are required from such fibers. Existing technologies still display limited performances in these design requirements. Here, achieving highly stretchable and sensitive strain sensors by using a coaxial structure, prepared via coaxial wet spinning of thermoplastic elastomer‐wrapped carbon nanotube fibers, is proposed. The sensors attain high sensitivity (with a gauge factor of 425 at 100% strain), high stretchability, and high linearity. They are also reproducible and durable. Their use as safe sensing components on deformable cable, expandable surfaces, and wearable textiles is demonstrated. 相似文献
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Hyeonseok Kim Habeom Lee Inho Ha Jinwook Jung Phillip Won Hyunmin Cho Junyeob Yeo Sukjoon Hong Seungyong Han Jinhyeong Kwon Kyu‐Jin Cho Seung Hwan Ko 《Advanced functional materials》2018,28(32)
To add more functionalities and overcome the limitation in conventional soft robots, highly anisotropic soft actuators with color shifting function during actuation is demonstrated for the first time. The electrothermally operating soft actuators with installed transparent metal nanowire percolation network heater allow easy programming of their actuation direction and instantaneous visualization of temperature changes through color change. Due to the unique direction dependent coefficient of thermal expansion mismatch, the suggested actuator demonstrates a highly anisotropic and reversible behavior with very large bending curvature (2.5 cm?1) at considerably low temperature (≈40 °C) compared to the previously reported electrothermal soft actuators. The mild operating heat condition required for the maximum curvature enables the superior long‐term stability during more than 10 000 operating cycles. Also, the optical transparency of the polymer bilayer and metal nanowire percolation network heater allow the incorporation of the thermochromic pigments to fabricate color‐shifting actuators. As a proof‐of‐concept, various color‐shifting biomimetic soft robots such as color‐shifting blooming flower, fluttering butterfly, and color‐shifting twining tendril are demonstrated. The developed color‐shifting anisotropic soft actuator is expected to open new application fields and functionalities overcoming the limitation of current soft robots. 相似文献
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Color‐Changing Soft Actuators: Biomimetic Color Changing Anisotropic Soft Actuators with Integrated Metal Nanowire Percolation Network Transparent Heaters for Soft Robotics (Adv. Funct. Mater. 32/2018) 
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下载免费PDF全文 Hyeonseok Kim Habeom Lee Inho Ha Jinwook Jung Phillip Won Hyunmin Cho Junyeob Yeo Sukjoon Hong Seungyong Han Jinhyeong Kwon Kyu‐Jin Cho Seung Hwan Ko 《Advanced functional materials》2018,28(32)
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Vladislav Stroganov Jitendra Pant Georgi Stoychev Andreas Janke Dieter Jehnichen Andreas Fery Hitesh Handa Leonid Ionov 《Advanced functional materials》2018,28(11)
A novel approach for fabrication of 3D cellular structures using new thermosensitive shape‐changing polymer films with photolithographically patterned surface—4D biofabrication is reported. The surface of shape‐changing polymer films is patterned to selectively adsorb cells in specific regions. The 2D cell pattern is converted to the 3D cell structure after temperature‐induced folding of the polymer films. This approach has a great potential in the field of tissue engineering and bioscaffolds fabrication. 相似文献
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Francesco Visentin Saravana Prashanth Murali Babu Fabian Meder Barbara Mazzolai 《Advanced functional materials》2021,31(32):2101121
Nature has inspired a new generation of robots that not only imitate the behavior of natural systems but also share their adaptability to the environment and level of compliance due to the materials used to manufacture them, which are typically made of soft matter. In order to be adaptable and compliant, these robots need to be able to locally change the mechanical properties of their soft material-based bodies according to external feedback. In this work, a soft actuator that embodies a highly controllable thermo-responsive hydrogel and changes its stiffness on direct stimulation is proposed. At a critical temperature, this stimulation triggers the reversible transition of the hydrogel, which locally stiffens the elastomeric containment at the targeted location. By dividing the actuator into multiple sections, it is possible to control its macroscopic behavior as a function of the stiffened sections. These properties are evaluated by arranging three actuators into a gripper configuration used to grasp objects. The results clearly show that the approach can be used to develop soft actuators that can modify their mechanical properties on-demand in order to conform to objects or to exert the required force. 相似文献
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Mimicking the hierarchically anisotropic structure and excellent mechanical properties of natural tissues, such as tendons and ligaments, using biomaterials is challenging. Despite recent achievements with anisotropic hydrogels, limitations remain because of difficulties in achieving both structural and mechanical characteristics simultaneously. A simple approach for fabricating hybrid hydrogels with a hierarchically anisotropic structure and superior mechanical properties that are reminiscent of tendons or ligaments is proposed. Alginate–polyacrylamide double‐network (DN) hydrogels incorporated with high aspect ratio mesoporous silica microparticles are stretched and fixed via subsequent drying and ionic crosslinking to achieve multiscale structures composed of an anisotropically aligned polymer network embedded with aligned microparticles. The mechanical properties of hydrogels can be further controlled by the degree of stretching, quantities, and functional groups of inorganic microparticles, and types of crosslinking cations. The subsequent reswelling results in a high water content (>80%) similar to that of natural tendons while high strength, modulus, and toughness are maintained. The optimized anisotropic hybrid hydrogel exhibits a tensile modulus of 7.2 MPa, strength of 1.3 MPa, and toughness of 1.4 MJ m?3 even in the swollen state, which is 451‐, 27‐, and 2.2 times higher than that observed in the non‐swollen tough DN hydrogel. This study suggests a new strategy for fabricating anisotropic hydrogels with superior mechanical properties to develop new biomaterials for artificial tendons or ligaments. 相似文献
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张敏;范亚男;寇芸洁;朱雁兵;尚佳奇;王斐然 《光通信研究》2025,(3)
光子轨道角动量（OAM）由于螺旋相位和高维量子特性,在量子计算方面有着巨大的应用潜力。文章基于当前已有的研究工作,介绍了OAM的重要发展历程以及各领域的相关应用,并给出了基于OAM的量子逻辑门以及其实验实现的相关工作,如高维非门、交换门和控制门等。同时,介绍了几种基于OAM的量子算法。近年来,OAM在量子计算方面的研究成为一大热点领域,但该领域尚处于发展阶段,还有很多技术和理论上的挑战需要克服。相信随着科技的进步,其在未来具有非常广阔的发展前景。 相似文献
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Deng Pan Dong Wu Peng-Ju Li Sheng-Yun Ji Xuan Nie Sheng-Ying Fan Guo-Yang Chen Chen-Chu Zhang Chen Xin Bing Xu SuWan Zhu Ze Cai YanLei Hu JiaWen Li JiaRu Chu 《Advanced functional materials》2021,31(14):2009386
Marangoni-effect-driven actuators (MDAs) have the advantages of direct light-to-work conversion and convenient operation, which makes it widely researched in the cutting-edge fields including robots, micromachines, and intelligent systems. However, the MDA relies on the surface tension difference and it only works on the 2D liquid–air interface. Besides, the MDAs are normally pure black due to the light-absorption material limitation. Herein, a transparent light-driven 3D movable actuator (LTMA) and a 3D manipulation strategy are proposed. The LTMA is composed of photothermal nanoparticles-doped temperature-responsive hydrogel, whose surface energy changes as the nanoparticles absorb light energy. The 3D manipulation strategy combines Marangoni effect with photothermal buoyancy flow for realizing complex self-propellant and floating/sinking motions. The LTMA can perform more advanced tasks such as 3D obstacle avoidance and 3D sampling. Benefiting from the porous structure of hydrogel, LTMA can naturally absorb the chemical molecules for remote sampling and automated drug delivery. The light-driven, transparent, three-dimensionally movable, and programmable actuator has promising prospects in the field of micromachines and intelligent systems. 相似文献
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Yaodong Zhao Bingcheng Yi Jilin Hu Dongjie Zhang Guotai Li Yun Lu Qihui Zhou 《Advanced functional materials》2023,33(26):2300710
When skin trauma occurs, rapid achievement of the post-wound closure is required to prevent microbial invasion, inhibit scar formation and promote wound healing. To develop a wound dressing for accelerating post-wound-closure and wound healing, a thermo-responsive and tissue-adhesive hydrogel with interpenetrating polymer networks (IPN) is fabricated based on N-dimethylbisacrylamide (NIPAM) and glutaraldehyde (GTA) cross-linked hyaluronic acid (HA). Results not only confirm the thermo-stimulated self-contraction and tissue adhesiveness of the HA-based IPN (PNI-HA), which effectively aids wound closure via mechanical stretch, but also verify the hemocompatibility and cytocompatibility of PNI-HA that tend to accelerate wound healing. In vivo, a mouse model of total skin defect demonstrates that PNI-HA acting as hydrogel sealant significantly achieves the sutureless post-wound-closure at the early stage of wound healing, and then promotes wound healing by reducing inflammatory cells infiltration, promoting angiogenesis as well as reducing collagen deposition. These results indicate that the developed thermo-responsive and tissue-adhesive hydrogel dressing offers a candidate to serve as a tissue sealant for wound healing. 相似文献
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Gang Ge Yizhou Zhang Jinjun Shao Wenjun Wang Weili Si Wei Huang Xiaochen Dong 《Advanced functional materials》2018,28(32)
In this study, a binary networked conductive hydrogel is prepared using acrylamide and polyvinyl alcohol. Based on the obtained hydrogel, an ultrastretchable pressure sensor with biocompatibility and transparency is fabricated cost effectively. The hydrogel exhibits impressive stretchability (>500%) and superior transparency (>90%). Furthermore, the self‐patterned microarchitecture on the hydrogel surface is beneficial to achieve high sensitivity (0.05 kPa?1 for 0–3.27 kPa). The hydrogel‐based pressure sensor can precisely monitor dynamic pressures (3.33, 5.02, and 6.67 kPa) with frequency‐dependent behavior. It also shows fast response (150 ms), durable stability (500 dynamic cycles), and negligible current variation (6%). Moreover, the sensor can instantly detect both tiny (phonation, airflowing, and saliva swallowing) and robust (finger and limb motions) physiological activities. This work presents insights into preparing multifunctional hydrogels for mechanosensory electronics. 相似文献
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Georgi Stoychev Lorenzo Guiducci Sébastien Turcaud John W. C. Dunlop Leonid Ionov 《Advanced functional materials》2016,26(42):7733-7739
Two important aspects of actuation behavior of stimuli‐responsive hydrogels are the complexity of the shape change and its speed. Here, it is shown that varying the shape of simple polymer bilayers can result in very complex and very fast spontaneous folding. The complexity and high folding rate arise from the choice of the shape and from the presence of inhomogeneous swelling within the thermoresponsive layer entrapped between the top hydrophobic layer and the substrate. In contrast to homogeneous swelling of a freestanding bilayer, which leads to a gradual increase of curvature throughout the whole bilayer, inhomogeneous swelling first results in complete rolling of the periphery of the film, which changes its mechanical properties and affects the subsequent morphing process. Further swelling of the thermoresponsive layer generates more stress that builds up until a buckling threshold is overcome, allowing very fast switching from the flat edge‐rolled configuration into a folded one. The research demonstrates how the introduction of holes into actuating bilayers gives rise not only to a novel geometric control over the folding fate of the films but also adds the ability to tune the rate of folding, through the careful selection of hole size, location, and shape. 相似文献
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Yongsuk Choi Ethan B. Secor Jia Sun Hyoungjun Kim Jung Ah Lim Moon Sung Kang Mark C. Hersam Jeong Ho Cho 《Advanced functional materials》2018,28(34)
The lamination of a high‐capacitance ion gel dielectric layer onto semiconducting carbon nanotube (CNT) thin‐film transistors (TFTs) that are bottom‐gated with a low‐capacitance polymer dielectric layer drastically reduces the operating voltage of the devices resulting from the capacitive coupling effect between the two dielectric layers sandwiching the CNT channel. As the CNT channel has a network structure, only a compact area of ion gel is required to make the capacitive coupling effect viable, unlike the planar channels of previously reported transistors that required a substantially larger area of ion gel dielectric layer to induce the coupling effect. The capacitively coupled CNT TFTs possess superlative electrical characteristics such as high carrier mobilities (42.0 cm2 (Vs)?1 for holes and 59.1 cm2 (Vs)?1 for electrons), steep subthreshold swings (160 mV dec?1 for holes and 100 mV dec?1 for electrons), and low gate leakage currents (<1 nA). These devices can be further integrated to form complex logic circuits on flexible substrates with high mechanical resilience. The layered geometry of the device coupled with scalable solution‐based fabrication has significant potential for large‐scale flexible electronics. 相似文献
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Funian Mo Yan Huang Qing Li Zifeng Wang Ruijuan Jiang Weiming Gai Chunyi Zhi 《Advanced functional materials》2021,31(28):2010830
Capacitive-type strain sensors based on hydrogel ionic conductors have undergone rapid development benefited from their robust structure, drift-free sensing, higher sensitivity, and precision. However, the unsatisfactory electro-mechanical stability of the conventional hydrogel conductors, which are normally vulnerable to large deformation and severe mechanical impacts, remains a challenge. In addition, there is not enough research regarding the adhesiveness and mechanical properties of the dielectric layer, which is also critical for the mechanical adaptability of the whole device. Here, a dynamically super-tough capacitive-type strain sensor based on energy-dissipative dual-crosslinked hydrogel conductors and an organogel dielectric with high adhesive strength is developed. Combining with the mechanical advantages of the hydro/organo-gels, the capacitive strain sensor exhibits high stretchability and superior linear dependence of sensitivity with a gauge factor of ≈0.8% at 100% strain. Moreover, the sensor displayed ultrastability against various severe mechanical stimuli that can even survive unprecedentedly from extremely catastrophic car run-over by 20 times. With these synergistic mechanical advantages, the capacitive strain sensor is successfully applied as a highly-reliable wearable sensing system to monitor diverse faint physiological signals and large-range human motions. 相似文献
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基于RM型三变量通用逻辑门的查表设计 总被引：5，自引：0，他引：5
本文讨论了逻辑函数的RM展开与分类，给出了基于逻辑函数RM展开的三变量函数P分类表、接线顺序表以及P分类代表函数的接线方案。在此基础上提出了基于RM型三变量通用逻辑门的查表设计方法，并给出了具体设计实例。 相似文献
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Haibo Ye Zhiyong Liu Bo Sun Xuning Zhang Tielin Shi Guanglan Liao 《Advanced Electronic Materials》2023,9(2):2200657
Mimicking the human visual memory system has attractive prospects in the field of artificial vision. However, the prominent challenge of realizing human visual memory is how to detect and store image information at the same time, which demands a multifunctional electronic device that can sense and memorize image information like the brain. In this work, simple two-terminal optoelectronic resistive random access memory (ORRAM) devices are demonstrated based on lead-free Cs2AgBiBr6 perovskite, exhibiting a unique optoelectronic resistive characteristic that can be reset by UV light illumination. A proof-of-concept artificial self-storage visual system based on the ORRAM is constructed, which shows similar reinforcement learning and memory forgetting functions to the human visual memory system, and realizes the integrated functions of image sensing and memory for a long-term retention time (>6000 s). Theoretical calculations indicate that UV light illumination will induce the annihilation of Br defects and cause the fracture of conductive filaments, resulting in the optical RESET phenomenon. Furthermore, by integrating with perovskite solar cells, an all-optically controlled universal implication logic gate is constructed. This work provides an important step toward the mimicry of human visual memory and the multifunctional artificial visual integration of perception and storage. 相似文献