Ethan Clarke
Plastic containers are a common feature of daily life, but are they diamagnetic? Diamagnetism is a property of materials that are repelled by a magnetic field, and it occurs in all materials. When a material is subjected to a magnetic field, the response will be either attraction or repulsion. Materials are classified as ferromagnetic, paramagnetic, or diamagnetic based on their response. While ferromagnetic materials like iron are strongly attracted to magnets, paramagnetic materials align with the magnetic field but are not as strongly attracted. Diamagnetic materials, on the other hand, exhibit a repulsive force when exposed to a magnetic field. This effect is usually very weak and can only be detected with sensitive laboratory equipment. So, are empty plastic containers diamagnetic?
| Characteristics | Values |
|---|---|
| Definition | The property of materials that are repelled by a magnetic field |
| Materials that are diamagnetic | Water, Copper, Bismuth, Zinc, Marble, Glass, Gold, Silver, Antimony, NACL, Carbon, Plastic |
| Magnetic field | Points in the opposite direction from the magnetic fields around them |
| Magnetism retention | Lose their magnetization when the external magnetic field is removed |
| Magnetic permeability | Less than the permeability of vacuum |
| Effect | Weak |
| Examples | A thin slice of pyrolytic graphite can be stably floated in a magnetic field; Levitating frog experiment |
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What You'll Learn
Plastic is diamagnetic
Diamagnetism was first discovered by Anton Brugmans in 1778, who observed that bismuth was repelled by magnetic fields. Michael Faraday later demonstrated in 1845 that this was a property of all matter and that materials responded either diamagnetically or paramagnetically to an applied magnetic field.
Diamagnetic materials, including plastics, have a relative magnetic permeability less than or equal to 1 and a magnetic susceptibility less than or equal to 0. This means that they are very weakly repelled by magnetic fields, and this effect is not observable in everyday life. In fact, diamagnetism is so weak in most materials that it can only be detected using sensitive laboratory instruments.
However, some materials, such as pyrolytic graphite, exhibit strong diamagnetism and can even be levitated in stable equilibrium within a magnetic field, with no power consumption. This phenomenon has been successfully demonstrated using thin slices of pyrolytic graphite and rare earth permanent magnets at room temperature.
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Superconductors and diamagnetism
Diamagnetism is a property of materials that are repelled by a magnetic field. When a magnetic field is applied, an induced magnetic field is created in the opposite direction, resulting in a repulsive force. This phenomenon is observed in all materials and is a quantum mechanical effect. However, in most materials, diamagnetism is weak and can only be detected using sensitive laboratory equipment.
Superconductors, on the other hand, exhibit strong diamagnetism due to the Meissner effect. When a superconductor is cooled below its critical temperature and subjected to a magnetic field, it expels all magnetic fields from its interior. This phenomenon was discovered by German physicists Walther Meissner and Robert Ochsenfeld in 1933. They observed that when superconducting tin and lead samples were cooled below their transition temperature in the presence of a magnetic field, nearly all interior magnetic fields were cancelled out.
The Meissner effect is characterized by the formation of screening currents that flow in opposition to the applied magnetic field. These currents create a magnetization that cancels out the external magnetic field, resulting in perfect diamagnetism or superdiamagnetism. Superdiamagnetism refers to the complete absence of magnetic permeability in certain materials at low temperatures. It is a feature of superconductivity and is distinct from the Meissner effect, which occurs during the transition to the superconducting state.
The combination of superdiamagnetism and flux pinning enables superconducting magnetic levitation. While superdiamagnetism repels approaching permanent magnets, flux pinning prevents the magnet from floating away. This results in stable magnetic levitation without any power consumption.
In conclusion, superconductors exhibit strong diamagnetism due to the Meissner effect, which expels magnetic fields from their interior when they are cooled below their critical temperature. This phenomenon leads to the emergence of superdiamagnetism and enables superconducting magnetic levitation through the combined effects of superdiamagnetism and flux pinning.
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Paramagnetic vs. diamagnetic materials
Materials can be broadly categorized into three types based on their behaviour when exposed to a magnetic field: ferromagnetic, paramagnetic, and diamagnetic.
Paramagnetic Materials
Paramagnetic materials are those that are attracted to a magnetic field. They have a small, positive susceptibility to magnetic fields. This means that when exposed to a magnetic field, paramagnetic materials will pull towards it. However, they are only attracted to one pole of the magnet. This behaviour is due to the presence of some unpaired electrons in the material. When exposed to a magnetic field, these unpaired electrons, also known as paramagnetic electrons, can realign under the influence of the external magnetic field, creating a net spin for the orbital. However, this magnetic property is fleeting and disappears after the material is removed from the magnetic field as electrons return to their original randomized orientations.
Some common paramagnetic materials include nickel (Ni), chromium (Cr), gallium (Ga), aluminum (Al), lithium (Li), nitrogen gas (N2), and oxygen gas (O2). Iron oxide (FeO), coordination complex myoglobin, and many metallic complexes are examples of paramagnetic compounds.
Diamagnetic Materials
Diamagnetic materials, on the other hand, are those that are repelled by a magnetic field. They have a weak, negative susceptibility to magnetic fields. This means that when exposed to a magnetic field, diamagnetic materials will exhibit a repelling action. However, this behaviour is not always visible, and some diamagnetic materials may appear to be immune to the effects of magnets. This is because diamagnetism is a weak effect in most materials and can only be detected by sensitive laboratory instruments.
Diamagnetic materials include those that have all their electrons paired. Since the electrons occur in pairs and spin in opposite directions, their magnetic fields cancel each other out, resulting in no permanent net magnetic moment per atom. Some common diamagnetic materials include copper (Cu), silver (Ag), gold (Au), lead (Pb), zinc (Zn), sulfur (S), and hydrogen gas (H2). Well-known diamagnetic compounds include water (H2O), table salt (NaCl), marble (calcium carbonate), and glass (silica-quartz).
Plastic is a diamagnetic material. Therefore, empty plastic containers are diamagnetic and will exhibit a repelling action when exposed to a magnetic field. However, this behaviour may not be visible, and the plastic container may appear to be unaffected by the magnet.
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Ferromagnetic vs. diamagnetic materials
All materials can be categorized as paramagnetic, ferromagnetic, or diamagnetic. These terms describe how a material responds to a magnetic field.
Diamagnetic materials are those that are repelled by magnets. They don't exhibit any attraction to magnets. Rather, diamagnetic materials exhibit the opposite behavior: they repel magnets. All diamagnetic materials exhibit a repelling action when exposed to a magnetic field. Some diamagnetic materials will visually push away from magnets, meaning they have a strong repelling behavior. Other diamagnetic materials will look like they are immune to the effects of magnets. In most materials, diamagnetism is a weak effect that can only be detected by sensitive laboratory instruments. However, a superconductor acts as a strong diamagnet because it entirely expels any magnetic field from its interior (the Meissner effect). Examples of diamagnetic materials include hydrogen, helium, carbon, copper, silver, gold, and plastic.
Ferromagnetic materials, on the other hand, exhibit a strong attraction toward magnets. They don't necessarily produce their own magnetic field; only magnets produce a magnetic field. Ferromagnetic materials simply pull themselves toward magnets. They are attracted to both poles of magnets. Some of the most common types of ferromagnetic materials include iron, nickel, cobalt, steel, and their alloys.
Paramagnetic materials are weakly attracted to magnets. They are attracted to only one pole of a magnet. Some examples of paramagnetic materials include aluminum and air.
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Examples of diamagnetic materials
Diamagnetic materials are those that are repelled by magnets and magnetic fields. They are not attracted to magnets and do not retain magnetic properties when removed from a magnetic field. This is because the magnetic fields of diamagnetic materials point in the opposite direction to the magnetic fields around them.
Diamagnetism is a quantum mechanical effect that occurs in all materials. However, when it is the only contribution to the magnetism, the material is called diamagnetic. In paramagnetic and ferromagnetic substances, the weak diamagnetic force is overcome by the attractive force of magnetic dipoles in the material.
Diamagnetic materials are used in Magnetic Resonance Imaging (MRI) systems. Some examples of diamagnetic materials include:
- Copper
- Zinc
- Silver
- Gold
- Antimony
- Marble
- Water
- Glass
- Wood
- Bismuth, which is the strongest known diamagnetic material
- Pyrolytic graphite, which is a strongly diamagnetic material that can float in a magnetic field
- Some plastics
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Frequently asked questions
Yes, plastic is a diamagnetic material.
Diamagnetic materials are those that are repelled by magnets and magnetic fields. In other words, they have a repulsive force when exposed to a magnetic field.
Copper, water, bismuth, zinc, marble, glass, gold, silver, and carbon are all diamagnetic materials.
