Logan Steele
Artificial muscles are devices or materials that can mimic the functions of natural muscles. They are highly flexible and have a wide range of applications in medicine, robotics, industry, and many other fields. Artificial muscles are capable of changing stiffness, contracting, expanding, or rotating with an external stimulus, such as electricity, to facilitate mechanical motion. They can be created from various materials, including polymers, shape-memory alloys, and carbon nanotubes, and can offer significant advantages over natural muscles in terms of strength and power output. The development of artificial muscles has been driven by advancements in materials, fabrication processes, and device structures, with ongoing research focusing on improving their performance and exploring new applications.
| Characteristics | Values |
|---|---|
| Purpose | To mimic natural muscles and their functions |
| Use cases | Robotics, prosthetics, flexible electronics, smart textiles, medical rehabilitation, human-machine interaction |
| Power source | Electricity |
| Advantages | Lighter, more robust, cheaper, more efficient, quiet, non-toxic |
| Disadvantages | No standard material for creating devices, limitations in weight and response times |
| Production methods | 4D printing, fiber-drawing, fused deposition modeling (FDM) |
| Materials | Polymers, carbon nanotubes, paraffin, shape-memory alloys (SMAs), liquid crystalline elastomers, metallic alloys, conductive elastomer ink, polyethelene, nylon, vanadium dioxide |
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What You'll Learn
Artificial muscles can be made from fishing line and sewing thread
Artificial muscles are actuator materials that can be used to imitate natural flexible motions, such as those performed by human muscles. They are named for their ability to achieve biological muscle-like function and have a wide range of applications in robotics, flexible electronics, smart textiles, and medical rehabilitation.
Artificial muscles can be made from a variety of materials, including hydraulic systems, servo motors, shape-memory metals, and polymers that respond to stimuli. One such example of polymer-based artificial muscles is the use of commercially available polymer fibers, such as polyethylene fishing line or nylon sewing thread. These fibers, when twisted and coiled, can contract and produce motion similar to human muscles.
The process of creating these artificial muscles involves twisting and coiling the polymer fibers to the point where they coil up. This results in the construction of highly efficient actuators that can be triggered by various stimuli, such as temperature changes, electrical power, or chemical reactions. The muscles can then be powered thermally, with temperature changes causing the coils to either tighten or lengthen, resulting in contraction or expansion.
The artificial muscles created from fishing line and sewing thread have been found to be extremely powerful. They can lift 100 times more weight and generate 100 times more power than a human muscle of the same length and weight. In addition, they offer advantages such as low cost, high efficiency, long cycle life, and low hysteresis.
The development of these artificial muscles has opened up a wide range of possibilities for their use. They can be applied in robotics, such as in humanoid companion robots, and in medical rehabilitation, with potential applications in prosthetics. The lightweight and fast-acting nature of these artificial muscles makes them a promising advancement in the field of robotics and human assistance.
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They can lift 100 times more weight than human muscles
Artificial muscles are devices or materials that can mimic the functions of natural muscles, such as contracting, expanding, or rotating in response to an external stimulus. They are named for their ability to achieve biological muscle-like functions and have a wide range of applications in fields like medicine, robotics, and industry.
One example of artificial muscles is the creation of researchers at MIT, who developed artificial muscles from ordinary fishing line and sewing thread. These artificial muscles can lift 100 times more weight and generate 100 times more power than a human muscle of the same length and weight. The researchers achieved this by aligning individual macromolecules with the fibre in commercially available polymer fibres and winding them into coils. These artificial muscles contract at speeds similar to human muscles.
The key to the process is mating together two materials with different thermal expansion coefficients, meaning they have different rates of expansion when heated. This allows the artificial muscle to be lightweight and fast-acting, making it ideal for robotics and prosthetics. The fibres are made using a fibre-drawing system, which involves creating an oversized version of the material, called a preform, and then heating it to a specific temperature at which the material becomes viscous. It can then be pulled to create a fibre that retains its internal structure but is a fraction of the width of the preform.
Another example of artificial muscles with extraordinary capabilities is the tiny artificial muscles composed of twisted carbon nanotubes filled with paraffin, which are 200 times stronger than human muscle. These artificial muscles can also be deformed and then returned to their original shape when exposed to heat.
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Electroactive polymers (EAPs) are a type of artificial muscle
Artificial muscles are named for their ability to achieve biological muscle-like function. They have broad application prospects in many fields such as robotics, flexible electronics, smart textiles, and medical rehabilitation. Electroactive polymers (EAPs) are a class of electrically activated artificial muscle materials. They are actuated through the application of electric fields and can be easily manufactured in various shapes due to the ease of processing many polymeric materials. This makes them very versatile materials.
EAPs can be classified into two main categories: ionic EAPs and dielectric EAPs. Dielectric EAPs are materials in which actuation is caused by electrostatic forces between two electrodes that squeeze the polymer. They require a large actuation voltage to produce high electric fields but have very low electrical power consumption. Examples include electrostrictive polymers and dielectric elastomers. On the other hand, ionic EAPs can be further divided into intrinsic and extrinsic EAPs. Intrinsic EAPs have electric conductivity by electron mobility or conductive particles in the polymer matrix, while extrinsic EAPs have ionic conductivity. Examples of ionic EAPs include polyelectrode gels, ionomeric polymer-metal composites (IPMC), conductive polymers, and pyromellitamide gels.
EAPs have been used in various applications, including the creation of a hand and refreshable Braille displays to aid the visually impaired. They have also been used in humanoid robots to emulate face and arm muscles. In 2012, a new class of electric field-activated, electrolyte-free artificial muscles called "twisted yarn actuators" was demonstrated. The first commercially developed device including EAPs as an artificial muscle was produced in 2002 by Eamex in Japan—a fish that could swim on its own by moving its tail using an EAP muscle.
In recent years, researchers have also developed artificial muscles from ordinary fishing line and sewing thread. These muscles can lift 100 times more weight and generate 100 times more power than a human muscle of the same length and weight. By winding them into coils, researchers have created artificial muscles that contract at speeds similar to human muscles.
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They have applications in medicine, robotics and prosthetics
Artificial muscles are materials or devices that mimic biological muscle and can change their stiffness, reversibly contract, expand, or rotate within one component due to an external stimulus. They can be made from a variety of materials, including fishing line, sewing thread, graphene fibres, carbon nanotube fibres, nylon fibres, spandex fibres, silk, cotton thread, and natural fibres.
They have applications in medicine, robotics, and prosthetics. In medicine, artificial muscles could be used for targeted drug delivery, as well as for microhydraulic actuation for surgical instruments. The use of artificial muscles in medicine is a high-priority area for research and development. In robotics, artificial muscles could be used for robotic arms, legs, grippers, and other applications where their lightweight, high power-to-weight ratio, and fast response times are advantageous. In prosthetics, artificial muscles could be used to create lightweight actuators for prosthetic limbs, improving the user experience by reducing weight.
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Artificial muscles can be created using 4D printing
Artificial muscles are materials that can achieve biological muscle-like function. They have a wide range of applications, including robotics, flexible electronics, smart textiles, and medical rehabilitation.
Artificial muscles can be created using various methods, including hydraulic systems, servo motors, shape-memory metals, and polymers that respond to stimuli. One of the most prominent types of artificial muscles is Electroactive Polymers (EAPs), which can be actuated through the application of electric fields.
Recently, researchers at Nottingham Trent University in the UK have been experimenting with creating artificial muscles using 4D printing technology. 4D printing combines advanced 3D printing technology with the change of form over time. The team, led by Fergal B. Coulter and Anton Ianakiev, has developed a system for producing seamless tubular silicone membranes with dielectric elastomer actuators (DEAs), a type of EAP. By sending low-energy electric signals to the flexible tubular structure, the DEAs can induce a change in form, mimicking the function of a muscle.
The modified 3D printing system used by the UK team employs a customized Leapfrog Creatr 3D printer to print multiple layers of tough and flexible silicone material at a consistent rate. Each surface layer of the silicone is coated with graphite, enabling it to act as a DEA electrode. The team inflates a balloon-like mandrel structure within the silicone muscles, replicating the mechanical strain and movement of a muscle.
The development of 4D-printed artificial muscles has significant implications for the field of soft robotics, as it brings researchers a step closer to creating lifelike robots with muscle-like functionality. The versatility of 4D printing technology also opens up new possibilities for designing and fabricating complex flexible actuators.
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Frequently asked questions
Artificial muscles are devices or materials that can mimic natural muscles and change stiffness, contract, expand, or rotate with an external stimulus.
Artificial muscles can be made from a variety of materials, including polymers, metals, and carbon nanotubes filled with paraffin.
Artificial muscles are highly flexible and have broad applications in medicine, robotics, industry, and many other fields. They are also lighter, more robust, cheaper, and more efficient than electric motors.
Artificial muscles use electricity to facilitate mechanical motion, similar to how natural muscles convert different chemicals into energy to operate.
Artificial muscles have been used in soft robotics, prosthetics, biomedical devices, and smart haptic surfaces. They have also been investigated for potential use in organ transplants, such as heart valve replacements.
