Heterogeneous Conductance‐Based Locally Shape‐Morphable Soft Electrothermal Actuator

Ahn, Junseong; Jeong, Yongrok; Zhao, Zhi‐Jun; Hwang, Soonhyoung; Kim, Kyuyoung; Ko, Jiwoo; Jeon, Sohee; Park, Jaeho; Kang, Hyeokjung; Jeong, Jun‐Ho; Park, Inkyu

doi:10.1002/admt.201900997

Cited by 31 publications

(35 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Electro‐active paper/fabric actuators that can bend, twist, and coil upon application of a voltage can be employed in soft robotics, [ 267 ] artificial muscles, [ 268 ] and biomimetic devices. [ 269 ] Traditional ionic liquid impregnated paper actuators work based on a combination of ion migration and piezoelectric effect.…”

Section: Electronic Devices Based On Flexible Porous Substratesmentioning

confidence: 99%

“…Owing to the large surface roughness and ultra-low resistance of the functionalized fabric, the resulting HMI shows excellent detection performance, including high sensitivity in a wide pressure range (0-30 kPa), low detection limit (0.76 Pa), and fast response time (6 ms). [267] Copyright 2019, Wiley-VCH. b) Self-sensing paper actuator that can distinguish the touch of soft and hard objects based on different piezoresistive responses.…”

Section: Human-machine Interfacesmentioning

confidence: 99%

“…Adding metal nanoparticles (e.g., Ag, Au) can further improve the conductivity of the heating layer. Figure 19a presents the fabric-based electrothermal actuator reported by Ahn et al [267] for use in biomimetic self-walking robots and object lifting robots. The conductive Ag NW/CNT composite heating layer can be driven by low voltage (<12 V).…”

Section: Actuatorsmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

A New Class of Electronic Devices Based on Flexible Porous Substrates

Zhang

Huang

et al. 2022

Advanced Science

View full text Add to dashboard Cite

With the advent of the Internet of Things era, the connection between electronic devices and humans is getting closer and closer. New‐concept electronic devices including e‐skins, nanogenerators, brain–machine interfaces, and implantable medical devices, can work on or inside human bodies, calling for wearing comfort, super flexibility, biodegradability, and stability under complex deformations. However, conventional electronics based on metal and plastic substrates cannot effectively meet these new application requirements. Therefore, a series of advanced electronic devices based on flexible porous substrates (e.g., paper, fabric, electrospun nanofibers, wood, and elastic polymer sponge) is being developed to address these challenges by virtue of their superior biocompatibility, breathability, deformability, and robustness. The porous structure of these substrates can not only improve device performance but also enable new functions, but due to their wide variety, choosing the right porous substrate is crucial for preparing high‐performance electronics for specific applications. Herein, the properties of different flexible porous substrates are summarized and their basic principles of design, manufacture, and use are highlighted. Subsequently, various functionalization methods of these porous substrates are briefly introduced and compared. Then, the latest advances in flexible porous substrate‐based electronics are demonstrated. Finally, the remaining challenges and future directions are discussed.

show abstract

Section: Electronic Devices Based On Flexible Porous Substratesmentioning

confidence: 99%

Section: Human-machine Interfacesmentioning

confidence: 99%

Section: Actuatorsmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

A New Class of Electronic Devices Based on Flexible Porous Substrates

Zhang

Huang

et al. 2022

Advanced Science

View full text Add to dashboard Cite

show abstract

“…[ 28,29 ] The shapes of these soft actuators can be changeable under these stimuli, especially the electrical stimulus that can be easily controlled as an input signal are widely employed. [ 18,30,31 ]…”

Section: Introductionmentioning

confidence: 99%

Transparent Soft Electrothermal Actuators with Integrated Cu Nanowire Heater for Soft Robotics

Chang

Zhao

Song

et al. 2021

Macro Materials & Eng

View full text Add to dashboard Cite

Soft actuators with high flexibility have received widespread attention. Here, a transparent electrothermal soft actuator is designed and manufactured via sandwiched copper nanowires (Cu NWs) between two kinds of flexible substrates with different thermal expansion characteristics (polyethylene‐terephthalate (PET) and low‐density polyethylene (LDPE)). In order to improve bending characteristics of the soft actuator, heating performance of heaters with different widths is studied, and the bending characteristics of strain gauges under different voltages are also studied. The fabricated soft actuator can produce a bend of 90° and provide about 1 mN of force at a low voltage of 6 V. The application of this type of soft actuator is demonstrated toward biomimetic robotics, a two‐finger flexible transparent gripper is designed, where two soft actuators are utilized to simulate the movements of human fingers and realizes the operation of picking and placing fine objects. In addition, the topography of the object can be feasibly observed during clamping process of the soft actuator with certain light transmittance, which is favorable for the soft gripper application.

show abstract

Lower‐Voltage‐Driven Deformable Soft Electrothermal Actuators with Embedded Liquid Metal EGaIn

Zhang

Cheng

et al. 2023

Adv Eng Mater

View full text Add to dashboard Cite

An interactive human-machine interface (iHMI), a platform for the two-way exchange of information between humans and computers for a variety of symbols and actions, has been the subject of extensive attention. [1,2] Traditionally, rigid sensors and actuators have been used for sensing in iHMI. However, rigid components are often poorly compatible with humans and uncomfortable to wear. Therefore, flexible, stretchable, and deformable actuators have been a focal point in recent studies. Soft actuators play an important role in a variety of fields such as haptic systems, [3,4] soft robots, [5,6] and rehabilitation devices [7,8] due to their low cost, easy deformation, high concealment, and good environmental adaptation. [9,10] Soft actuators can respond to a wide range of stimuli, including electrical [11] and magnetic fields, [12] light [13] and hydraulic pressure, [14] and so on. Based on the types of stimuli, soft actuators can be classified into electrothermal actuators (ETAs), magnetic response actuators, light thermal actuators, electrochemical actuator temperature response actuators, humidity response actuators, and so on. [15][16][17][18] Among them, the ETAs have attracted more interest due to their simple construction and ease of control. As a response to the input electrical signal, the ETAs can generate deformation because of the mismatch in the thermal expansion coefficient (TEC) between different materials/ layers of ETAs when heated. Compared with other electrically responsive actuators, the ETAs can respond to lower voltages rapidly and accurately, indicating these ETAs are more suitable for iHMI. [19] In addition, the highest level of national safety voltage is 6 V, which will not cause harm to human body. Thus, more studies have been carried out focusing on ETAs driven by lower voltage. The key to achieving fast low-voltage-driven ETAs is the acquisition of large, fast temperature increments, which depends on the Joule heat produced by the heating layer/conductive circuit. Thus, designing and fabricating suitable materials for the heating layer/conductive circuit is of significance for lower-voltage-driven ETAs.The conductive composite materials can be obtained by mixing conductive materials (such as carbon nanotubes, [20] silver nanowires, [21] and graphene [22] ) and flexible materials (such as polydimethylsiloxane (PDMS), [23] silicone rubber, and liquid crystal elastomer (LCE) [24] ). Ahn et al. proposed a new deformable ETA utilizing nonhomogeneous electrical conductivity. In the new ETA, carbon nanotubes/silver nanowires/PDMS composites are used as the heating layer, by which the temperature can be increased to up to 120 °C at a driving voltage of 10 V.

show abstract

Heterogeneous Conductance‐Based Locally Shape‐Morphable Soft Electrothermal Actuator

Cited by 31 publications

References 37 publications

A New Class of Electronic Devices Based on Flexible Porous Substrates

A New Class of Electronic Devices Based on Flexible Porous Substrates

Transparent Soft Electrothermal Actuators with Integrated Cu Nanowire Heater for Soft Robotics

Lower‐Voltage‐Driven Deformable Soft Electrothermal Actuators with Embedded Liquid Metal EGaIn

Contact Info

Product

Resources

About