Nanotubes

Nanoscience

The study of structures that are between 1–100 nanometres in size.

Nanoparticle

A particle that measures between 1–100 nm in diameter. It contains only a few hundred atoms.

Nanotube

A cylindrical nanostructure made from carbon atoms arranged in a tube, often with very high strength and conductivity.

Carbon Nanotube (CNT)

A tube-shaped form of carbon, similar to a rolled-up sheet of graphene, with strong covalent bonds, making them strong, light, and excellent conductors.

Graphene

A single layer of carbon atoms arranged in a 2D hexagonal lattice, from which nanotubes are made.

Surface Area to Volume Ratio (SA:V)

A measure of how much surface area a particle has compared to its volume; nanoparticles have a very high SA:V ratio.

Fullerene

A form of carbon molecule made entirely of carbon atoms arranged in a hollow sphere, tube, or cage (e.g., buckminsterfullerene, C₆₀). Nanotubes are a type of fullerene.

Buckminsterfullerene (C₆₀)

A spherical fullerene made of 60 carbon atoms, arranged like a football (pentagons and hexagons).

Intermolecular Forces (IMFs)

Weak forces between molecules; nanotubes and graphene have strong covalent bonds, not weak IMFs.

What is a nanotube?

A nanotube is a long, thin cylinder made from carbon atoms, usually a rolled-up layer of graphene.

What are carbon nanotubes made from?

They are made from carbon atoms arranged in hexagons, usually from graphene sheets.

Why are carbon nanotubes useful in industry?

They are very strong, lightweight, and excellent conductors of electricity and heat.

List 3 uses of carbon nanotubes.

• Strengthening materials (e.g., sports equipment)

• Conductive materials in electronics

• Drug delivery in medicine

What is the main bonding type in carbon nanotubes?

Strong covalent bonds between carbon atoms.

Why are nanotubes used in nanotechnology?

Due to their small size, high strength, and excellent conductivity.

What property of nanoparticles makes them different from bulk materials?

They have a high surface area to volume ratio, giving them unique properties.

What is nanoscience?

The study of structures sized between 1–100 nm.

How does the structure of a carbon nanotube relate to its properties?

Carbon atoms in nanotubes are bonded in hexagons via strong covalent bonds, making them extremely strong and stiff, and allowing electron delocalisation, making them conductive.

How can nanotubes be used in medicine?

They can be used to deliver drugs directly into cells due to their tiny size and ability to enter biological structures.

What is the difference between graphene and a carbon nanotube?

Graphene is a flat 2D sheet of carbon atoms; a nanotube is a rolled-up cylinder of graphene.

Why are carbon nanotubes better electrical conductors than many metals?

They allow electrons to move freely along the tube due to delocalised electrons and strong covalent bonding.

What are some challenges or risks of using nanoparticles and nanotubes in products? (Triple only)

• Toxicity concerns — unknown long-term health effects.

• Environmental impact — hard to control once released.

• Regulation is still developing in nanotechnology.