Wiktor Wise
Electroactive polymers (EAPs) are materials that change shape or size when an electric field is applied to them. The first piezoelectric polymer was discovered in 1925, and since then, various materials have been developed to exhibit electroactive properties. One of the most common applications for EAPs is in robotics, where they are used to develop artificial muscles. For example, researchers from MIT have developed nylon fibres that flex like muscles when an electric current is applied. Additionally, flexible electronics have gained popularity, with applications in self-powered IoT systems and wearable health-monitoring devices.
| Characteristics | Values |
|---|---|
| Material | Nylon fibers |
| Type of movement | Contraction and expansion |
| Applications | Robotics, automobile and aviation industries, clothing, sensors, implanted in the human body |
| Advantages | Low cost, simple manufacturing process, good cycling longevity, high speed |
| Disadvantages | N/A |
| Other materials with similar applications | Carbon nanotubes, electroactive polymers, nitinol wire, pneumatic muscles, piezoelectric materials, artificial muscles, HASEL actuators, electroorigami actuators |
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What You'll Learn
Nylon fibres can flex like muscles
Researchers from the Massachusetts Institute of Technology (MIT) have developed a method to make nylon fibres flex like muscles. This is achieved by shaping and heating the fibres in a particular way. The process involves using ordinary nylon fishing line and compressing it to change its cross-section from round to rectangular or square.
The MIT researchers have demonstrated one of the simplest and lowest-cost systems for developing artificial muscles. The key ingredient is cheap and ubiquitous: ordinary nylon fibre. This new nylon-based system uses inexpensive materials and a simple manufacturing process, and demonstrates very good cycling longevity.
There are existing materials that can be used to produce bending motions, such as carbon nanotube yarns and shape-memory alloys. However, these materials tend to be very expensive and difficult to make. Nylon fibres, on the other hand, are cheap and easy to work with.
The researchers have shown that their nylon fibres can maintain their performance after at least 100,000 bending cycles and can bend and retract at a speed of at least 17 cycles per second. This discovery has potential applications in robotics, automobile and aviation industries, and even clothing that adjusts to the contours of the wearer's body.
The development of nylon fibres that can flex like muscles is a significant advancement in the field of artificial muscles, offering a simple, low-cost, and effective solution with a wide range of potential applications.
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Polyvinyl thin-film photovoltaics are flexible
Several materials can bend or flex when introduced to electricity. One such material is nylon fibre, which researchers at MIT have developed to mimic the bending motions of natural muscle tissues. This material can be used in robotics, the automobile industry, and aviation.
Another material that can flex when introduced to electricity is polyvinyl thin-film photovoltaics. Thin-film photovoltaics are an emerging class of alternatives to silicon photovoltaics. They are made by depositing one or more thin layers of photovoltaic material onto a substrate, such as glass, plastic, or metal. Polyvinyl thin-film photovoltaics are flexible because they are very thin, typically only a few nanometers to a few microns thick. This is much thinner than conventional crystalline silicon-based solar cells, which can be up to 200 microns thick.
The flexibility of polyvinyl thin-film photovoltaics offers several advantages. Firstly, it makes them ideal for applications such as building-integrated photovoltaics (BIPV). Their thin and flexible nature allows them to be easily integrated into various structures. Secondly, polyvinyl thin-film photovoltaics are more lightweight than other types of solar panels, making them suitable for portable devices. Thirdly, their flexibility makes them easier to install than rigid solar panels, reducing installation costs.
In addition to their flexibility, polyvinyl thin-film photovoltaics have other benefits. They are more budget-friendly than other types of solar panels, as they require less material and are easier to manufacture. They also have a reduced ecological impact due to generating less waste. Furthermore, polyvinyl thin-film photovoltaics can be made using different materials, such as amorphous silicon, cadmium telluride, or copper indium gallium selenide, offering a range of options for specific applications.
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Electroactive polymers are suitable for bending
Electroactive polymers (EAPs) are a class of polymeric materials that change shape and size when exposed to an electric field. They are suitable for bending due to their large active deformation potential, high response speed, low density, and improved resilience.
The history of the first reported occurrence of an electroactive phenomenon dates back to 1880, when Wilhelm Röntgen observed a length-change in a fixed rubber band with a weight on one end when it was electrically charged and discharged. In 1899, M. P. Sacerdote confirmed Röntgen's experiment and formulated a theory of the strain response to electric field activation. In 1925, the first piezoelectric polymer, called electret, was discovered.
Electroactive polymers can be divided into two principal classes: dielectric and ionic. Dielectric EAPs are materials in which actuation is caused by electrostatic forces between two electrodes that squeeze the polymer. Dielectric elastomers can undergo very high strains and are capacitors that change their capacitance when a voltage is applied, allowing the polymer to compress in thickness and expand in area due to the electric field. This type of EAP requires a large actuation voltage (hundreds to thousands of volts) but has a very low electrical power consumption.
Ionic EAPs, on the other hand, are driven by the displacement of ions during electrical stimulation, resulting in a change in shape or volume. Their main advantage is that they can be activated by low voltages of 1-2V. However, they need to maintain wetness as the ions are diffused inside an electrolyte. Ionic EAPs are commonly used as bending actuators with strong bending capabilities but have a relatively slow response speed.
The versatility of electroactive polymers is further demonstrated by their applications in various fields. For example, they can be used in robotics, automobile and aviation industries, and biomedical devices. Additionally, they can be used for static shape correction, jitter suppression, and the correction of optical aberrations caused by atmospheric interference.
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Carbon nanotubes are fast artificial muscles
Several materials can flex when introduced to electricity. One such material is nylon fibre, which can be used to produce bending motions similar to those of natural muscle tissues. Nylon fibres can be heated using various methods, including electric resistance heating, chemical reactions, or a laser beam. When a voltage is applied, the fibre bends in the direction of the heat source.
Another material that can flex when introduced to electricity is carbon nanotubes. Carbon nanotubes are tiny, cylindrical tubes made of carbon atoms. When combined with an electrolyte, they function as fast artificial muscles. Researchers at the University of Texas at Dallas and their collaborators worldwide have been working with carbon nanotubes to create artificial muscles. By twisting and coiling carbon nanotube or polymer yarns, they have created powerful unipolar muscles that contract when electrically charged.
Electrochemically driven carbon nanotube muscles provide a solution to the need for fast, powerful, large-stroke artificial muscles. These muscles are actuated by applying a voltage between the muscle and a counter electrode, driving ions from a surrounding electrolyte. This process allows the muscle to contract in one direction over the entire stability range of the electrolyte, making it faster and more powerful than other artificial muscles.
Carbon nanotube yarns also offer great longevity, with more than a million linear contraction cycles. However, they are still too expensive for widespread use. The development of electrochemically driven carbon nanotube muscles provides an alternative to thermally driven artificial muscles, which have limitations due to their energy conversion efficiencies being restricted by the thermodynamic heat engine limit.
Overall, carbon nanotubes show great potential as fast artificial muscles, with their ability to contract quickly and powerfully when electrically charged.
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Flexible, organic, thin materials can generate electricity
The potential applications of this material are vast, from artificial skin sensors to powering pacemakers, clothing, control buttons, robots, and other medical devices. It could also be used in wearable monitors that generate electricity from the wearer's movement. For example, it could be implanted near the heart to generate electricity from the heartbeat, powering pacemakers without the need for invasive battery-replacement operations.
The development of this material is an exciting breakthrough, but it is not easy to produce. The two materials must be shaped before being connected, and a strong electric field is then introduced to create the piezoelectric effect. This process is challenging, but the unique benefits of organic materials, such as lower prices, small weight, material abundance, and high flexibility, make them an attractive prospect for future technologies.
Other flexible materials that can generate electricity when stressed include carbon nanotubes combined with an electrolyte, which functions as an artificial muscle with an applied potential. However, this material is still too expensive and inaccessible for widespread use. Nylon fibers have also been developed by MIT researchers to flex like muscles with the application of electricity, and these fibers are inexpensive and simple to manufacture.
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Frequently asked questions
Electroactive polymers (EAPs) are a group of polymers that change shape or size when an electric field is applied.
Some examples of EAPs include polyvinylidene fluoride (PVDF) and ionic polymer-metal composites (IPMCs).
The electric field causes a force to be applied to each partial charge in the polymer, resulting in the rotation of the entire polymer unit, which leads to deformation and strain.
EAPs have a variety of applications, including sensors, actuators, and artificial muscles. They can also be used in robotics, biomedical devices, and tactile displays.
Yes, researchers have developed flexible materials that can generate electricity when stressed or stretched. These materials can be used in sensors, clothing, and robotics.
