What is nanoscience?
The study of structures that are between 1 and 100 nm in size
The study of structures that are between 10 and 1,000 nm in size
The study of structures that are between 1 and 1,000 nm in size
Which of these is a use for titanium dioxide nanoparticles?
Catalysts
Deodorants
Sunscreens
What property of nanoparticle silver would make it useful in surgical wound dressings?
It keeps out air
It destroys bacteria
It acts as a catalyst
Which of these is a potential risk of using nanoparticles to make products for human use?
Nanoparticles are toxic
Nanoparticles are very expensive
Nanoparticles may have effects that have not yet been discovered
Which smart material would you find in the lenses of glasses that darken in bright sunlight?
Photochromic pigment
Shape memory alloy
Thermochromic pigment
Silver nanoparticles can be used in wound dressing. What property of silver nanoparticles does this use?
They are shiny
They kill bacteria
They block out ultraviolet light
What is the meaning of a smart material?
Materials have properties that change when a change occurs in their environment, and this change is reversible
Materials have properties that stay the same when a change occurs in their environment
Materials have properties that change when a change occurs in their environment, and this change is not reversible
Which of the following is a use for a shape memory polymer?
Nappies
Sunglasses
Car bumpers
Nitinol (NiTi) is a shape memory alloy. What elements are present in nitinol?
Nickel and tin
Nickel and titanium
Nitrogen and tin
What change in the environment affects the smart material thermochromic pigment?
pH
Light
Temperature