Smart materials

Question 1

shape memory alloys also called SMA’s

Answer 1

can be plastically deformed and return to their original shape heat or current is applied. E.G -
uses-
1. glass frames.
2. greenhouse window openers
3.medical stents

Question 2

what the advantages and disadvantages of SMA’s

Answer 2

1. less complexity.
2. lengthen life of product.
3. reduces overall size
   however
4. Expensive.
5. continuous use can cause metal fatigue.

Question 3

Nanomaterials

Answer 3

Made of tiny components less than
100mm. E.G.- may be particles nanowire or nanotube.
uses-
1. sunscreen.
2.motorcycle helmets
3. tennis rackets
4. car bumpers

Question 4

State the advantages and disadvantages of nanomaterials

Answer 4

1. larger relative surface area improves different properties.
2. can combine different properties
   however-
3. unusual chemical and physical properties,
4. need risk assessment for health and environment

Question 5

Define modern materials

Answer 5

Do not occur naturally but are existing materials that have been altered to improve properties

Question 6

Define smart materials.

Answer 6

are existing materials or modern materials that have physical properties that can be varied by external inputs.

Question 7

Reactive glass

Answer 7

Uses electrochromic technology to change the opaque with velocity while allowing light to pass on both sides.
uses-
1.windows
2. welding masks and googles.

Question 8

state the advantages and disadvantages of reactive glass

Answer 8

1.instant privacy without blocking natural light.
2. retains heat- reduces energy bills
however,
1. expensive
2. requires electrical source

Question 9

Piezoelectric materials

Answer 9

Generate a small electric charge when compress sensor. Generate movement when an electric charge is applied.
uses
1. sensors
2. Actuators

Question 10

State the Advantages and disadvantages of piezoelectric

Answer 10

1.sustainable,
2.compact size
3. low maintenance.
however-
1. wear out.
2. has temperature, load and voltage limitations.

Question 11

Temperature responsive polymers

Answer 11

can change physical properties with temperature change
application-
1. delivers drugs, cells and proteins to patients.
2.used as sensors and gel activators

Question 12

state the advantages and disadvantages of temperature responsive polymers

Answer 12

1. useful biomedical applications.
   however-
2. still in research meaning wider application may take time.

Question 13

Conductive inks

Answer 13

contains small pigments that allow small currents to flow even when dry. made with silver or carbon graphite.
applications-
1. printing RFID tags for tickets
2.drawing working circuits on polyester, polycarbonates and paper

Question 14

State the advantages and disadvantages of conductive inks

Answer 14

1.low waste
2. easy to use.
3.lighter and more economical than traditional circuit boards.