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422 results on '"Zhang, Yong-Lai"'

8. Flexible Superhydrophobic Infrared Invisibility Cloak for Hiding Objects From Both Thermal and Laser Detections

Author

Yang, Jun-Hao, Han, Dong-Dong, Ge, Xiao-Liang, Bi, Ran, Xu, Zhao-Hua, Ren, Hang, Zhu, Yang, Zheng, Yan, Zhang, Liu, Wang, Lei, Zhang, Yong-Lai, and Xu, Su

Abstract

Infrared invisibility has continued to develop in recent decades, triggered by novel physics, advanced fabrication technology and raw materials. However, the quick response of infrared stealth during transmedia (water–air/water–land) movement, which is important in practical scenarios, has not been investigated. Here, we employ the random thermal effect of the interaction between laser and matter to construct a bionic flexible thin-film superhydrophobic infrared invisibility cloak. The average emissivity of invisibility cloak is 0.224 over 8–14 ${{\mu }}\text{m}$, and specular reflectivity at the incident angle of 10 degree is 1.1% over 2.5–16 ${{\mu }}\text{m}$. These characteristics indicate the integrated stealth functionality against active (laser) and passive (thermal) detection, respectively. The contact angle between the cloak and water is 154°, which also indicates its unique cross-media response capability. We also show that the developed infrared stealth cloak is robust to practical (nonideal) manufacturing conditions. Our design strategy expands the concept of infrared stealth to cross-media applications.

Published
2024
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14. Multiresponsive MXene Actuators with Asymmetric Quantum‐Confined Superfluidic Structures.

Author

Ma, Jia‐Nan, Ma, Bo, Wang, Zheng‐Xiao, Song, Pu, Han, Dong‐Dong, and Zhang, Yong‐Lai

Subjects
ACTUATORS, SOFT robotics, CHEMICAL stability, SMART materials, THERMAL conductivity
Abstract

MXene, which is known for its high electrical/thermal conductivity, surface hydrophilicity, excellent mechanical flexibility, and chemical stability, is a versatile and smart material for soft actuators. However, most MXene actuators are fabricated by combining MXene with other inert materials to form a bilayer or multilayer structure. Considering the strain mismatch at multimaterial interfaces under frequent deformation, MXene‐based actuators are generally associated with poor stability, which limits their practical applications. Herein, inspired by the natural quantum‐confined superfluidic (QSF) effect, a multiresponsive MXene actuator that can be driven by moisture, light, and electricity by engineering an asymmetric QSF structure on both sides of the MXene film is reported. The actuation mechanism of the MXene film can be attributed to nonuniform water adsorption, transport, and desorption within the asymmetric QSF channels under moisture, photothermal, and electrothermal stimuli. Interestingly, MXene actuators can be flexibly formed into various shapes under moisture‐assisted mechanical compression, which not only enhances their multiresponsive actuation, but also permits a more complex deformation. As proof‐of‐concept demonstrations, various intriguing applications including a dual‐role robot, a smart shielding curtain, and a dragonfly robot, are fabricated, revealing the potential of MXene actuators for soft robotics. [ABSTRACT FROM AUTHOR]

Published
2024
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25. Bioinspired Superhydrophobic Swimming Robots with Embedded Microfluidic Networks and Photothermal Switch for Controllable Marangoni Propulsion.

Author

Mao, Jiang‐Wei, Han, Dong‐Dong, Zhou, Hao, Sun, Hong‐Bo, and Zhang, Yong‐Lai

Subjects
SWITCHING systems (Telecommunication), SWIMMING, MARANGONI effect, BIOLOGICALLY inspired computing, ROBOTS, SUPERHYDROPHOBIC surfaces
Abstract

Chemical Marangoni propulsion enables dynamic and untethered motion by generating surface tension gradient through chemical release, thereby having great potential for the development of insect‐scale self‐propelled robots. However, as the release and diffusion of chemical "fuels" are commonly uncontrollable, the Marangoni propulsion is unstable, thereby restricting robotic applications. Herein, the laser fabrication of superhydrophobic swimming robots to develop controllable Marangoni propulsion based on a photothermal composite of graphene and polydimethylsiloxane is reported. By combining the microfluidic channels with photothermal air chambers, a light‐triggered switch that can control the release of chemical "fuels" is proposed. Furthermore, a superhydrophobic surface is fabricated on the swimming robot by laser treatment, which reduced water resistance and promoted propulsion. On‐demand actuation and swimming route planning are realized by programming the alcohol/air segments in the releasing channels, on‐demand actuation and swimming route planning have been realized. As a proof‐of‐concept, a Marangoni swimming robot equipped with a miniature digital camera is used in an actual environment. Therefore, this study is expected to advance the practical applications of the chemical Marangoni effect in swimming robots. [ABSTRACT FROM AUTHOR]

Published
2023
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28. Laser-induced color centers in crystals

Author

Gao, Si, primary, Duan, Yan-Zhao, additional, Tian, Zhen-Nan, additional, Zhang, Yong-Lai, additional, Chen, Qi-Dai, additional, Gao, Bing-Rong, additional, and Sun, Hong-Bo, additional

Published
2022
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41. Reprogrammable Soft Robot Actuation by Synergistic Magnetic and Light Fields.

Author

Han, Bing, Ma, Zhuo‐Chen, Zhang, Yong‐Lai, Zhu, Lin, Fan, Hua, Bai, Benfeng, Chen, Qi‐Dai, Yang, Guang‐Zhong, and Sun, Hong‐Bo

Subjects
MAGNETIC fields, SOFT robotics, ROBOT control systems, DEGREES of freedom, ROBOTS
Abstract

Soft robots controlled by different actuation schemes are flourishing owing to the continued development of smart materials. However, most of the existing actuators are powered by a single source with predetermined mechanical properties and motion characteristics. Speed, power, and efficiency of these actuators are thus far inferior to their conventional counter parts. How to preload or alter the internal energy distribution and trigger rapid kinetic energy release combined with re‐programmability is a challenge and corresponding solutions will extend the practical use of soft robotics. Herein, a hybrid magnetically and photothermally responsive actuator with high degrees of freedom by using a coupled‐field manipulation strategy is proposed. As a proof‐of‐concept, a crab robot (CraBot) that contains uniformly distributed superparamagnetic particles and localized light‐responsive joints is produced. The spatial magnetic field exerts force on the robot, leading to real‐time adjustment of energy distribution within the entire robot. Meanwhile, the focused light field enables selective deformation of specific joints, releasing the accumulated energy into kinetic energy of motion for quick actuation. The directional accumulation and addressable release of elastic energy enables the CraBot to walk efficiently with improved power and speed. Such a hybrid‐field manipulation strategy holds great promise for sophisticated actuation of soft robots. [ABSTRACT FROM AUTHOR]

Published
2022
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