Umair Gaines
Friction is a retarding force that occurs when two surfaces slide against each other, resulting from the electromagnetic attraction between charged particles on the surfaces. It is not a fundamental force but rather the result of energy dissipation processes such as elastic and plastic deformation, phonon and electron excitation, and adhesion. Friction can cause the generation of static electricity, also known as triboelectricity, through the triboelectric effect. This effect involves rubbing different objects or materials together to increase surface contact and produce an electric charge. The bending and deformation of tiny protrusions on the surfaces lead to the creation of voltages, resulting in static charging or static electricity.
| Characteristics | Values |
|---|---|
| What is the type of electricity produced by friction? | Static electricity |
| What is another term for static electricity produced by friction? | Triboelectricity |
| What is the process by which static electricity is produced by friction? | Triboelectric effect |
| What causes static electricity? | An imbalance of electric charges on the surface of a material |
| What is the cause of the imbalance of electric charges? | The bending and deformation of tiny protrusions on the surface of the material |
| What is the term for this phenomenon? | Flexoelectric effect |
| What is the result of the flexoelectric effect? | The creation of voltages that cause static charging |
| What is another term for static charging? | Tribocharging |
| What is the role of friction in triboelectricity? | Friction is a retarding force that contributes to the triboelectric effect |
| What are some examples of the triboelectric effect? | Lightning, metal fences emitting electrical charges, electrical systems in cars shorting out, sparks from clothes |
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What You'll Learn
- Triboelectricity: electrification of objects due to electron collision
- Flexoelectricity: polarization due to strain gradients
- Triboelectric charging: contact electrification, or static electricity
- The flexoelectric effect: voltages from protrusions cause static charging
- Triboluminescence: light associated with sliding or contact
Triboelectricity: electrification of objects due to electron collision
Triboelectricity is the electrification of two objects or materials due to the collision of electrons flowing from one material to the other. The process of rubbing materials against each other increases surface contact, intensifying the connection between their surfaces and producing an electric charge known as the triboelectric effect. The triboelectric effect is a form of contact electrification, where certain substances become electrically activated after they are removed from a different substance with which they were linked. This process is called triboelectric charging.
The triboelectric series is a list of substances ordered by their characteristics, such as how quickly they accumulate a charge relative to other substances on the list. The list was first created by Johan Carl Wilcke in 1757 in his paper on static charges. The farther away two substances are from each other on the list, the greater the charge transmitted. The triboelectric effect is dependent on the strength and polarity of the charges created, which vary according to the substances, temperature, strain, surface roughness, and other characteristics.
The mechanism behind triboelectrification is still being studied and debated. There is ongoing discussion about whether electrons or ions are transferred in the process. Some researchers, like Harper, discuss both possibilities, while others like Vick favour electron transfer. Laurence D. Marks, who led a study on the topic, supports both possibilities. The flexoelectric effect, which occurs when charges in an insulator are separated due to deformations such as bending, is also related to triboelectricity.
Triboelectricity has been known for thousands of years, with the first recording of electrostatic charging by the Greek philosopher Thales of Miletus around 600 BCE. Since then, triboelectricity has been frequently experienced and utilised in various applications, such as the Van de Graaff generator, a simple device that uses a belt of rubber to produce static electricity. In modern times, the triboelectric effect is an important concept in the aircraft industry, with NASA defining a triboelectrification rule that guides decisions about spacecraft launches. Triboelectric nanogenerators (TENGs) have also been invented to harvest small-scale mechanical energy, converting it into electricity for self-powered systems.
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Flexoelectricity: polarization due to strain gradients
Friction is a retarding force that occurs due to different energy dissipation processes, such as elastic and plastic deformation, phonon and electron excitation, and adhesion. It is not a fundamental force but is the result of an electromagnetic attraction between the charged particles on two surfaces in contact. When two surfaces slide against each other, friction is created.
Friction and static electricity are closely linked. Static electricity is an imbalance of electric charges on the surface of a material. It is produced when two objects are rubbed together, and the asperities on their surfaces bend and become deformed. This is known as the flexoelectric effect, which occurs when charges are separated due to deformations such as bending. The voltages created by this process cause static charging or static electricity.
Flexoelectricity is the response of polarization due to strain gradients. It is one of the effects of friction, along with triboelectricity and friction itself, which are all inextricably linked. Triboelectricity is the electrification of different objects and materials due to the collision of electrons flowing from one material to another when they are rubbed together.
The triboelectric effect has been known for centuries, with early records from the medieval period documenting its use. For example, Archbishop Eustathius of Thessalonica, a 12th-century Greek scholar, recorded that Woliver, king of the Goths, could draw sparks from his body. This effect was also mentioned in records from China and other places, indicating a global understanding of the phenomenon.
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Triboelectric charging: contact electrification, or static electricity
Triboelectric charging, also known as contact electrification or static electricity, is a common phenomenon in daily life. It occurs when two materials are brought into contact and then separated, or when they slide against each other. This process can be observed in everyday life, such as when a plastic pen is rubbed on a shirt sleeve, or when a balloon rubbed against hair sticks to a wall. The triboelectric effect can be intensified by increasing the surface contact between the two objects, and it can occur even when two pieces of the same material are rubbed together.
The term "electricity" is derived from the Greek word "ēlektron," meaning amber—a substance that can gain an electric charge through friction with wool. The prefix "tribo" also comes from Greek, meaning "to rub." The triboelectric effect was first recorded by Thales of Miletus in 600 BCE, who noticed that rubbing amber with fur caused the fur to attract dust.
At the nanoscale, all materials have rough surfaces with tiny protrusions. When two materials come into contact and rub against each other, these protrusions bend and deform, creating voltages that cause static charging. This phenomenon is known as the flexoelectric effect, which occurs when the separation of charge in an insulator arises from deformations such as bending. The flexoelectric effect is linked to triboelectricity and friction, providing insight into how these forces can be handled in new technologies.
Triboelectric charging plays a significant role in various industries and processes, such as the packaging of pharmaceutical powders, dust storms, and planetary formation. It can also increase friction and adhesion, which has implications for understanding natural phenomena like geckos walking on water. In addition, triboelectric nanogenerators have been developed to harness mechanical energy through the combination of tribo-electrification and electrostatic induction, offering potential for new applications.
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The flexoelectric effect: voltages from protrusions cause static charging
Friction is the resistance to motion of one object in relation to another object, or when two surfaces slide against each other. It is the result of an electromagnetic attraction between the charged particles existing in the two contacting surfaces.
At the nanoscale, all materials have rough surfaces with countless tiny protrusions. When two materials come into contact and rub against one another, these protrusions bend and deform. This is called the flexoelectric effect, which occurs when the separation of charge in an insulator arises from deformations such as bending.
Marks’s team from Northwestern University found that these deformations give rise to voltages that ultimately cause static charging. Using a simple model, the team showed that the voltages arising from the bending protrusions during rubbing are large enough to cause static electricity. This work explains a number of experimental observations, such as why charges are produced even when two pieces of the same material are rubbed together.
The flexoelectric effect has important implications for existing electrostatic applications, such as energy harvesting and printing, as well as for avoiding potential dangers, such as fires started by sparks from static electricity.
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Triboluminescence: light associated with sliding or contact
Triboluminescence is the emission of light resulting from the friction or contact of two surfaces. The prefix tribo- comes from the Greek word for 'rub' and refers to sliding, friction, and related processes.
The phenomenon of triboluminescence has been observed since ancient times. For instance, the Greek philosopher Thales of Miletus first reported friction-induced static electricity in 600 BCE when he rubbed amber with fur and noticed that the fur attracted dust. In the medieval period, Archbishop Eustathius of Thessalonica recorded that the King of the Goths, Woliver, could draw sparks from his body.
Triboluminescence occurs due to the transfer of charge between two surfaces in contact. All materials, no matter how smooth they seem, have rough surfaces with countless tiny protrusions or asperities. When two materials come into contact and rub against each other, these protrusions bend and become deformed. This bending and deformation lead to the generation of voltages, resulting in static charging or static electricity. This process is known as the flexoelectric effect, which occurs when the separation of charges in an insulator arises from deformations such as bending.
The triboelectric effect refers to the process of increasing surface contact between two objects or materials by rubbing them together to produce an electric charge. Triboelectric charging plays a significant role in various industries and natural processes, such as the packaging of pharmaceutical powders, dust storms, and even planetary formation. It is also linked to the generation of static electricity, with researchers suggesting that triboelectricity, flexoelectricity, and friction are closely interconnected.
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Frequently asked questions
Yes, friction can cause electricity. This phenomenon is called the triboelectric effect.
When two objects are rubbed together, the asperities (protrusions) on their surfaces bend and become deformed. These deformations create voltages, which cause static charging or static electricity. This is known as the flexoelectric effect.
A common example of friction causing electricity is when a balloon rubbed against hair makes the balloon stick to a wall.
The phenomenon of friction-induced static electricity was first reported by the Greek philosopher Thales of Miletus in 600 BCE. He observed that rubbing amber with fur caused the fur to attract dust.
