Nanoparticles Flashcards
What are the diameter ranges to each of these particles?
Nanoparticle-
Fine particles-
Coarse particles-
Nanoparticle-1-100nm
Fine particles-100-2500nm
Coarse particles-2500-10000nm
What is a nanoparticle?
A small particle between 1 to 100 nanometres.
How many atoms do nanoparticles contain?
Few hundred atoms.
What is crosslinking?
Forming covalent bonds.
What is nanocoating?
Nanoscale thickness of thin film used to protect or improve a material.
Benefits of nanocoating for the environment?
Less materials are used,
therefore less energy and fuel is used
less waste is produced.
Why is graphite soft and conducts electricity?
Structure and bonding
Each carbon atom forms 3 covalent bonds.
There are many layers of carbon with weak intermolecular forces which can slide over each other.
Has delocalised electrons that can move freely throughout the lattice structure.
Why is Buckminsterfullerene a good lubricant?
Spherical shape will make the molecule roll.
Why is it cheaper to use nanoparticles of silver over coarse particles of silver?
Nanoparticles have a larger surface area, therefore less can be used for the same effect.
What is a giant lattice structure?
Compound of ions arranged in a regular pattern.
Ionic substance properties?
They can dissolve in water and they have a high melting point.
Bonding in sodium chloride?
Attracted by electrostatic forces. Sodium loses an electron and becomes a positive ion (Na+). Chlorine gains an electron and becomes a negative ion (Cl-).
What is electrolysis?
When ionic substances are decomposed into simpler substances by an electric current.
Ethical issues of using a compound of iodine on sodium chloride used in food.
People should have the right to choose.
Individuals may need different amounts.
Why does Iodine have a low melting point?
Simple molecules that have weak intermolecular forces. They require little energy to overcome.
