Emerging Liquid Alloy Intelligence: From Fundamental to Application Exploration

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "D:Materials and Processing".

Deadline for manuscript submissions: closed (10 November 2021) | Viewed by 7485

Special Issue Editors


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Guest Editor
School of Mechanical Science and Engineering, Huazhong University of Science and Technology, 1037 Luoyu Rd, Wuhan 430074, China
Interests: soft robotics; bio-inspired soft microsystems; stretchable electronics; microfluidics; biomedical devices; non-conventional manufacturing technologies
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Guest Editor
Technical Institute of Physics and Chemistry (TIPC), Chinese Academy of Sciences (CAS)

Special Issue Information

Dear Colleagues,

Being a high-fluidity, highly conductive material at room temperature, liquid alloys demonstrate numerous attractive advantages in many aspects, particularly for the deformable smart system in dynamic situations. Potentially, they will be an essential part of future soft intelligence and ultimately serve as an intimate partner of our daily life.

We invite original research papers, technical notes and shorter communications that focus on all areas on liquid alloy development at the micro/nanoscale, from fundamental research, including materials, interface, processing and devices, to application exploration, including biology, environment, electromagnetics, agriculture and robots, to contribute to this Special Issue. We are also looking for high-quality comprehensive reviews and perspectives that reference prior interest expressed to the Editorial Office and have received formal approval. Topics of particular interest include but are not limited to the following:

Materials discovery and processing:

  • Physical and chemical properties;
  • Bulky, droplet, marble, and composites;
  • Interface characteristics regulation;
  • Manufacturing process technologies.

Structures and devices:

  • Advanced micro/nanostructures or simulations;
  • Ultra-high-sensitivity flexible sensors;
  • Multi-modal sensors;
  • Environment or health monitoring sensors;
  • Microfluidic chips or devices;
  • Flexible or deformable actuators.

Systems and applications:

  • Diagnostics or therapy;
  • Biotechnology;
  • Soft machines;
  • Wearable devices;
  • Reconfigurable antenna or radio frequency (RF) devices;
  • Thermal cooling system design and devices;
  • Precision agriculture and plants protection;
  • Ocean or space exploration;
  • Sensing and manipulation of intelligent soft robotics.

Prof. Dr. Zhigang Wu
Prof. Dr. Wei Rao
Guest Editors

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Published Papers (2 papers)

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Research

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14 pages, 4065 KiB  
Article
A Gravity-Triggered Liquid Metal Patch Antenna with Reconfigurable Frequency
by Peng Qin, Guan-Long Huang, Jia-Jun Liang, Qian-Yu Wang, Jun-Heng Fu, Xi-Yu Zhu, Tian-Ying Liu, Lin Gui, Jing Liu and Zhong-Shan Deng
Micromachines 2021, 12(6), 701; https://doi.org/10.3390/mi12060701 - 16 Jun 2021
Cited by 7 | Viewed by 2794
Abstract
In this paper, a gravity-triggered liquid metal microstrip patch antenna with reconfigurable frequency is proposed with experimental verification. In this work, the substrate of the antenna is quickly obtained through three-dimensional (3D) printing technology. Non-toxic EGaIn alloy is filled into the resin substrate [...] Read more.
In this paper, a gravity-triggered liquid metal microstrip patch antenna with reconfigurable frequency is proposed with experimental verification. In this work, the substrate of the antenna is quickly obtained through three-dimensional (3D) printing technology. Non-toxic EGaIn alloy is filled into the resin substrate as a radiation patch, and the NaOH solution is used to remove the oxide film of EGaIn. In this configuration, the liquid metal inside the antenna can be flexibly flowed and deformed with different rotation angles due to the gravity to realize different working states. To validate the conception, the reflection coefficients and radiation patterns of the prototyped antenna are then measured, from which it can be observed that the measured results closely follow the simulations. The antenna can obtain a wide operating bandwidth of 3.69–4.95 GHz, which coverage over a range of frequencies suitable for various channels of the 5th generation (5G) mobile networks. The principle of gravitational driving can be applied to the design of reconfigurable antennas for other types of liquid metals. Full article
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Review

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17 pages, 4068 KiB  
Review
Recent Progress on Plant-Inspired Soft Robotics with Hydrogel Building Blocks: Fabrication, Actuation and Application
by Zhenyu Xu, Yongsen Zhou, Baoping Zhang, Chao Zhang, Jianfeng Wang and Zuankai Wang
Micromachines 2021, 12(6), 608; https://doi.org/10.3390/mi12060608 - 24 May 2021
Cited by 16 | Viewed by 4123
Abstract
Millions of years’ evolution has imparted life on earth with excellent environment adaptability. Of particular interest to scientists are some plants capable of macroscopically and reversibly altering their morphological and mechanical properties in response to external stimuli from the surrounding environment. These intriguing [...] Read more.
Millions of years’ evolution has imparted life on earth with excellent environment adaptability. Of particular interest to scientists are some plants capable of macroscopically and reversibly altering their morphological and mechanical properties in response to external stimuli from the surrounding environment. These intriguing natural phenomena and underlying actuation mechanisms have provided important design guidance and principles for man-made soft robotic systems. Constructing bio-inspired soft robotic systems with effective actuation requires the efficient supply of mechanical energy generated from external inputs, such as temperature, light, and electricity. By combining bio-inspired designs with stimuli-responsive materials, various intelligent soft robotic systems that demonstrate promising and exciting results have been developed. As one of the building materials for soft robotics, hydrogels are gaining increasing attention owing to their advantageous properties, such as ultra-tunable modulus, high compliance, varying stimuli-responsiveness, good biocompatibility, and high transparency. In this review article, we summarize the recent progress on plant-inspired soft robotics assembled by stimuli-responsive hydrogels with a particular focus on their actuation mechanisms, fabrication, and application. Meanwhile, some critical challenges and problems associated with current hydrogel-based soft robotics are briefly introduced, and possible solutions are proposed. We expect that this review would provide elementary tutorial guidelines to audiences who are interested in the study on nature-inspired soft robotics, especially hydrogel-based intelligent soft robotic systems. Full article
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