Nanoparticles Flashcards
Define nanoscience
Nanoscience is the study of very tiny particles or structures between 1 and 100 nanometres in size - where 1 nanometre = 10 -9 metres
Write 1mm in metres
1mm= 1 x 10 -3 m
A thousandth of a metre
Write 1 micrometre in metres
1 μm = 1 x 10 -6 m
A millionth of a metre
Write 1 nanometre in metres
1nm = 1 x 10 -9 m
A billionth of a metre
State another name for coarse particles
Coarse particles can be referred to as:
PM10 (subscript 10)
Dust
State the diameter of Coarse particles
Coarse particles (PM10) have diameters between 1 x 10 -5 m and 2.5 x 10 -6 m.
How many atoms do Coarse particles contain
Coarse particles contain tens of thousands of atoms
State another name for Fine particles
Fine particles can be referred to as:
PM2.5 (subscript 2.5)
State the diameter of Fine particles
Fine particles (PM2.5), have a diameter between 100
and 2500 nm
(1 x 10-7 m and 2.5 x 10-6 m).
How many atoms do Fine particles contain
Fine particle contain several thousand atoms
State the diameter of nanoparticles
Nanoparticles have a diameter between 1 and 100 nanometres
How many atoms do Nanoparticles contain
Nanoparticles contain a few hundred atoms
What is the relationship between the particle size and surface area to volume ration
As the side of cube decreases by a factor of 10 the surface area to
volume increases by a factor of 10.
Show the relationship between particle size and surface area to volume ration, with cubes.
file:///C:/Users/44748/Documents/nanoparticles.pdf
The size of the side of a cube is 10 cm
Surface area = 10 x 10 x 6 = 600 cm2
Volume = 10 x 10 x 10 = 1000 cm3
Surface Area : Volume ratio = 600/1000 = 0.6 /cm
The size of the size of a cube is 1 cm
Surface area = 1 x 1 x 6 = 6
Volume = 1 x 1 x 1 = 1
Surface Area : Volume ratio = 6/1= 6 /cm
How big is the surface area : volume ratio of nanoparticles
Nanoparticles have a huge surface area : volume ratio