C3.11/C3.12 - Nanoparticles

Question 1

nanoscience

Answer 1

study of particles between 1- 100 nanometres in size

Question 2

1 nm =

Answer 2

• 1 x 10 to the power of -9
  -1 billionth of a metre

Question 3

particulate matter (pm)

Answer 3

-particles in air
-often pollutants or pollen/dust

Question 4

size of nanoparticles

Answer 4

2 order of magnitude (100 times) smaller than the finest dust particle
-invisible in light

Question 5

the higher the SA:V ratio is ..

Answer 5

the greater the proportion of particles exposed at the surface are

Question 6

Nanoparticles SA:V ratio

Answer 6

-higher ratio = reacts quicker

Question 7

why do nanoparticles react quicker

Answer 7

more particles nearer to surface = more exposure to reactant = faster reaction

Question 8

surface are

Answer 8

length x width x number of faces

Question 9

volume

Answer 9

length x width x depth

Question 10

why is nanotech useful

Answer 10

-smaller quantities are used for same outcome
-less resources are used up
-more sustainable approach in industries

Question 11

Nanotech: Fabrics - application

Answer 11

-silver nanoparticles embedded in fabric

Question 12

Nanotech: Fabrics - benefits

Answer 12

-gives fabric antibacterial properties
-odour resistant

Question 13

Nanotech: Fabrics - cons

Answer 13

-washed out of clothes
-damage environment

Question 14

Nanotech: Medicine -application

Answer 14

-delivery of drugs to particular locations in body
-known as nanocages

Question 15

Nanotech: Medicine - pros

Answer 15

-destroys tumour cells but not healthy cells

Question 16

Nanotech: Medicine - cons

Answer 16

-needs more testing before trusted by public

Question 17

Nanotech: Electronics - application

Answer 17

-used to improve displays

Question 18

Nanotech: Electronics - pros

Answer 18

-reduces power consumption
-decreases weight of screens
-less material

Question 19

Nanotech: Electronics - cons

Answer 19

• damage environment if disposed of incorrectly

Question 20

Nanotech: sunscreens - application

Answer 20

-nanoparticles coated in zinc oxide

Question 21

Nanotech: sunscreens - pros

Answer 21

-absorb uv light more efficiently
-better skin coverage

Question 22

Nanotech: sunscreens - cons

Answer 22

-can cause skin damage

Question 23

Nanotech: cosmetics - application

Answer 23

-face creams/deodrant use silver nanoparticles

Question 24

Nanotech: cosmetics - pros

Answer 24

-better skin coverage
-effective on bacteria

Question 25

Nanotech: cosmetics - cons

Answer 25

-can cause skin damage

Question 26

Nanotech: catalysts - application

Answer 26

-platinum nanoparticles used as catalysts in fuel cells that produce hydrogen ions

Question 27

Nanotech: catalysts - pros

Answer 27

-cheaper
-lighter than normal ones as less platinum is used

Question 28

Nanotech: catalysts - cons

Answer 28

-difficult to dispose of without causing environmental damage