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275 results on '"Han, Dong-Dong"'

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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9. 21 kW, 166 fs pulses from passive mode-locked ytterbium-doped fiber laser employing Bi2O2Te nanosheets as saturable absorber in 1 μm.

Author

Hui, Zhan-Qiang, Yang, Zhao-Feng, Han, Dong-Dong, Li, Tian-Tian, Gong, Jia-Min, and Li, Xiao-Hui

Subjects
MODE-locked lasers, FIBER lasers, FREQUENCY combs, OPTICAL communications, LASER machining, NANOSTRUCTURED materials
Abstract

Ultrafast pulsed lasers are pivotal in advanced domains such as optical communications, optical metrology, all-optical sampling, optical frequency combs, laser ranging, and laser machining, where saturable absorbers (SAs) are crucial components. Various SAs based on two-dimensional (2D) materials have attracted great attention in recent years due to their low cost, high stability, large modulation depth, broadband absorption, and excellent optical nonlinearity. In this work, Bi2O2Te nanosheets (NSs) based SA with a saturation intensity of 20.6 MW/cm2 and a modulation depth of 2.2% was prepared by utilizing liquid phase exfoliation (LPE) technique, which was firstly applied to a passively mode-locked ytterbium-doped fiber laser (YDFL). The experiment results show that a sequence of dissipative soliton (DS) pulse train with a repetition frequency of 3.303 MHz was obtained at 1032.5 nm. The pulse duration, signal-to-noise ratio (SNR), and maximum peak power were 166 fs, 70 dB, 21 kW, respectively. The results not only underscore the potential of Bi2O2Te NSs-based SA for ultrafast photonics applications around 1 μm wavelength, but also open a way for further exploration of high-performance, all-fiber laser sources utilizing 2D materials. [ABSTRACT FROM AUTHOR]

Published
2024
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12. Successful Application of Novel Low Density High Temperature Resistant Cement in Bohai Bay Steam Recovery Wells

Author

Feng, Ying tao, additional, Tian, Jin, additional, Puspitasari, Melinda, additional, Zhang, Hao, additional, Cui, Ce, additional, Li, Yi, additional, Geng, Li Jun, additional, Han, Dong Dong, additional, Tang, Yu Tong, additional, Wang, You Wei, additional, Feng, Qing Hao, additional, Zhao, Dong Hui, additional, Zhao, Hu, additional, Yu, Bin, additional, Xiao, Wei, additional, Fang, En lou, additional, Dan, Lian, additional, and Zhao, Jun, additional

Published
2024
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15. Impact of metabolic dysfunction-associated fatty liver disease on liver transplant recipients with hepatitis B virus-related hepatocellular carcinoma

Author

Zhu, Ji-Qiao, primary, Ye, Xiao-Yong, additional, Yang, Shi-Wei, additional, Liu, Jia-Zong, additional, Ren, Zhang-Yong, additional, Jia, Ya-Nan, additional, Liu, Zhe, additional, Ding, Cheng, additional, Kou, Jian-Tao, additional, Li, Xian-Liang, additional, Han, Dong-Dong, additional, and He, Qiang, additional

Published
2023
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18. 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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36. 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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