Vitrimer-based soft actuators with multiple responsiveness and self-healing ability triggered by multiple stimuli

Matter ◽  
2021 ◽  
Author(s):  
Yang Yang ◽  
Huimin Wang ◽  
Shuai Zhang ◽  
Yen Wei ◽  
Xiangming He ◽  
...  
Keyword(s):  
Self Healing ◽  
Soft Actuators

scholarly journals A Self-Healing Polymer with Fast Elastic Recovery upon Stretching

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 597 ◽  
Author(s):  
Pei-Chen Zhao ◽  
Wen Li ◽  
Wei Huang ◽  
Cheng-Hui Li
Keyword(s):  
Room Temperature ◽  
Elastic Recovery ◽  
Self Healing ◽  
Original Length ◽  
Healing Efficiency ◽  
Recovery Behavior ◽  
Long Time ◽  
Highly Stretchable ◽  
Soft Actuators

The design of polymers that exhibit both good elasticity and self-healing properties is a highly challenging task. In spite of this, the literature reports highly stretchable self-healing polymers, but most of them exhibit slow elastic recovery behavior, i.e., they can only recover to their original length upon relaxation for a long time after stretching. Herein, a self-healing polymer with a fast elastic recovery property is demonstrated. We used 4-[tris(4-formylphenyl)methyl]benzaldehyde (TFPM) as a tetratopic linker to crosslink a poly(dimethylsiloxane) backbone, and obtained a self-healing polymer with high stretchability and fast elastic recovery upon stretching. The strain at break of the as-prepared polymer is observed at about 1400%. The polymer can immediately recover to its original length after being stretched. The damaged sample can be healed at room temperature with a healing efficiency up to 93% within 1 h. Such a polymer can be used for various applications, such as functioning as substrates or matrixes in soft actuators, electronic skins, biochips, and biosensors with prolonged lifetimes.

scholarly journals Design of a High-Speed Prosthetic Finger Driven by Peano-HASEL Actuators

2020 ◽  
Vol 7 ◽  
Author(s):  
Zachary Yoder ◽  
Nicholas Kellaris ◽  
Christina Chase-Markopoulou ◽  
Devon Ricken ◽  
Shane K. Mitchell ◽  
...  
Keyword(s):  
High Speed ◽  
Kinematic Model ◽  
Electrical Energy ◽  
Dc Motor ◽  
Self Healing ◽  
Force Output ◽  
Prosthetic Limbs ◽  
Neuromuscular Systems ◽  
Soft Actuators ◽  
Prosthetic Finger

Current designs of powered prosthetic limbs are limited by the nearly exclusive use of DC motor technology. Soft actuators promise new design freedom to create prosthetic limbs which more closely mimic intact neuromuscular systems and improve the capabilities of prosthetic users. This work evaluates the performance of a hydraulically amplified self-healing electrostatic (HASEL) soft actuator for use in a prosthetic hand. We compare a linearly-contracting HASEL actuator, termed a Peano-HASEL, to an existing actuator (DC motor) when driving a prosthetic finger like those utilized in multi-functional prosthetic hands. A kinematic model of the prosthetic finger is developed and validated, and is used to customize a prosthetic finger that is tuned to complement the force-strain characteristics of the Peano-HASEL actuators. An analytical model is used to inform the design of an improved Peano-HASEL actuator with the goal of increasing the fingertip pinch force of the prosthetic finger. When compared to a weight-matched DC motor actuator, the Peano-HASEL and custom finger is 10.6 times faster, has 11.1 times higher bandwidth, and consumes 8.7 times less electrical energy to grasp. It reaches 91% of the maximum range of motion of the original finger. However, the DC motor actuator produces 10 times the fingertip force at a relevant grip position. In this body of work, we present ways to further increase the force output of the Peano-HASEL driven prosthetic finger system, and discuss the significance of the unique properties of Peano-HASELs when applied to the field of upper-limb prosthetic design. This approach toward clinically-relevant actuator performance paired with a substantially different form-factor compared to DC motors presents new opportunities to advance the field of prosthetic limb design.

Hydraulically amplified self-healing electrostatic actuators with muscle-like performance

Science ◽  
2018 ◽  
Vol 359 (6371) ◽  
pp. 61-65 ◽  
Author(s):  
E. Acome ◽  
S. K. Mitchell ◽  
T. G. Morrissey ◽  
M. B. Emmett ◽  
C. Benjamin ◽  
...  
Keyword(s):  
High Speed ◽  
Dielectric Breakdown ◽  
Artificial Muscle ◽  
Robotic Arm ◽  
Soft Robotics ◽  
Self Healing ◽  
Electrostatic Actuators ◽  
Robotic Devices ◽  
Soft Actuators ◽  
Wide Potential

Existing soft actuators have persistent challenges that restrain the potential of soft robotics, highlighting a need for soft transducers that are powerful, high-speed, efficient, and robust. We describe a class of soft actuators, termed hydraulically amplified self-healing electrostatic (HASEL) actuators, which harness a mechanism that couples electrostatic and hydraulic forces to achieve a variety of actuation modes. We introduce prototypical designs of HASEL actuators and demonstrate their robust, muscle-like performance as well as their ability to repeatedly self-heal after dielectric breakdown—all using widely available materials and common fabrication techniques. A soft gripper handling delicate objects and a self-sensing artificial muscle powering a robotic arm illustrate the wide potential of HASEL actuators for next-generation soft robotic devices.

scholarly journals A Stretchable Pillararene-Containing Supramolecular Polymeric Material with Self-Healing Property

Molecules ◽  
2021 ◽  
Vol 26 (8) ◽  
pp. 2191
Author(s):  
Meng Zhao ◽  
Changjun Li ◽  
Xiaotao Shan ◽  
Huijing Han ◽  
Qiuhua Zhao ◽  
...  
Keyword(s):  
Polymeric Material ◽  
Polymeric Materials ◽  
Absorption Efficiency ◽  
Self Healing ◽  
Wearable Electronics ◽  
Energy Absorption Efficiency ◽  
New Type ◽  
Healing Property ◽  
Soft Actuators ◽  
Energy Absorbing

Constructing polymeric materials with stretchable and self-healing properties arise increasing interest in the field of tissue engineering, wearable electronics and soft actuators. Herein, a new type of supramolecular cross-linker was constructed through host-guest interaction between pillar[5]arene functionalized acrylate and pyridinium functionalized acrylate, which could form supramolecular polymeric material via photo-polymerization of n-butyl acrylate (BA). Such material exhibited excellent tensile properties, with maximum tensile strength of 3.4 MPa and strain of 3000%, respectively. Moreover, this material can effectively dissipate energy with the energy absorption efficiency of 93%, which could be applied in the field of energy absorbing materials. In addition, the material showed self-healing property after cut and responded to competitive guest.

Thermo‐ and Mechanochromic Camouflage and Self‐Healing in Biomimetic Soft Actuators Based on Liquid Crystal Elastomers

2021 ◽  
Author(s):  
Zhongcheng Liu ◽  
Hari Bisoyi ◽  
Yinliang Huang ◽  
Meng Wang ◽  
Hong Yang ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Self Healing ◽  
Liquid Crystal Elastomers ◽  
Soft Actuators

scholarly journals Dynamics of electrohydraulic soft actuators

2020 ◽  
Vol 117 (28) ◽  
pp. 16207-16213 ◽  
Author(s):  
Philipp Rothemund ◽  
Sophie Kirkman ◽  
Christoph Keplinger
Keyword(s):  
Electric Fields ◽  
High Speed ◽  
Scaling Analysis ◽  
Self Healing ◽  
Electrostatic Actuator ◽  
Fundamental Physics ◽  
Soft Actuators ◽  
External Loads ◽  
Electrohydraulic Actuators ◽  
Inertial Regime

Nature has inspired the design of robots in which soft actuators enable tasks such as handling of fragile objects and adapting to unstructured environments. Those tasks are difficult for traditional robots, which predominantly consist of hard components. Electrohydraulic soft actuators are liquid-filled shells that deform upon the application of electric fields; they excel among soft actuators with muscle-like force outputs and actuation strains, and with actuation frequencies above 100 Hz. However, the fundamental physics that governs the dynamics of electrohydraulic soft actuators is unexplored. Here, we study the dynamics of electrohydraulic soft actuators using the Peano-HASEL (hydraulically amplified self-healing electrostatic) actuator as a model system. Using experiments and a scaling analysis, we discover two dynamic regimes: a regime in which viscous dissipation reduces the actuation speed and a regime governed by inertial effects in which high-speed actuation is possible. For each regime, we derive a timescale that describes the influence of geometry, materials system, and applied external loads on the actuation speed. We also derive a model to study the dynamic behavior of Peano-HASEL actuators in both regimes. Although this analysis focuses on the Peano-HASEL actuator, the presented results may readily be generalized to other electrohydraulic actuators. When designed to operate in the inertial regime, electrohydraulic actuators will enable bio-inspired robots with unprecedented speeds of motion.

Autonomous self-healing polyisoprene elastomers with high modulus and good toughness based on the synergy of dynamic ionic crosslinks and highly disordered crystals

2020 ◽  
Vol 11 (41) ◽  
pp. 6549-6558
Author(s):  
Yohei Miwa ◽  
Mayu Yamada ◽  
Yu Shinke ◽  
Shoichi Kutsumizu
Keyword(s):  
Mechanical Properties ◽  
Room Temperature ◽  
Self Healing ◽  
High Modulus ◽  
Disordered Crystals ◽  
Ionic Crosslinks

We designed a novel polyisoprene elastomer with high mechanical properties and autonomous self-healing capability at room temperature facilitated by the coexistence of dynamic ionic crosslinks and crystalline components that slowly reassembled.

Congenital self-healing histiocytosis

1982 ◽  
Vol 118 (4) ◽  
pp. 267-272 ◽  
Author(s):  
E. Bonifazi
Keyword(s):  
Self Healing
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