Smart Materials

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22 Terms

1
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What is a smart material

A material whose physical properties change in response to an external stimuli

2
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What are 4 stimuli smart materials change in response to

-Light

-Temperature

-Pressure

-Moisture

3
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What does SMA stand for

Smart memory alloy

4
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What do smart memory alloys do

They can return to an original shape once heat is applied

5
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What are three uses of SMA’s

-Dental braces

-Heart surgery

-’Memoflex’ glass

6
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Why is SMA used in dental braces

They are designed to change at body temperature so when they are placed in the mouth they remain at a constant temperature

7
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Why is SMA used in heart surgery

They use SMA tubes that are designed to expand at 37 centigrade so they can insert them into the artery and then the ambient temperature will make them expand

8
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Why is SMA used in ‘memoflex’ glass

Use SMA frames so if the frames bent out of shape they will return to their original shape at room temperature.

9
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What do thermochromic inks do

They are liquid crystals that when heated change colour

10
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What are two uses of thermochromic inks

-Thermometers

-Batteries

11
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Why is thermochromic ink used in thermometers

Babies find thermometers invasive n=and this technology allows thermometers to be created that can just be placed on the forehead and display a different colour if the baby has a fever

12
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Why is thermochromic ink used in batteries

If there is enough energy in the battery for use the strip is heated up changing colour to let the user know

13
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What do hydrochromic inks do

They change colour in response to moisture

14
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List two uses of hydrochromic ink

-Marketing materials

-On umbrella

15
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What do phosphorescent pigments do

They absorb large amounts of light energy and then remit the light for a large amount of time (glow in the dark)

16
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What is a use of phosphorescent pigment

In emergency exit signs

17
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Why is phosphorescent pigment used in emergency exit signs

They are not reliant on electricity to glow so if the power goes out in an emergency people can still safely evacuate

18
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What does photochromic pigment do

Changes colour due to light intensity

19
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What are two uses of photochromic pigment

-Sunglasses

-Security ink

20
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Why is photochromic pigment used in sunglasses

They darken in response to light which protects the eye

21
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Why is photochromic pigment used in security ink

The ink will not appear under normal light, just UV making forging important documents harder

22
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What does electroluminescent wire do

Glows in response to a current