Year 8 composites and smart materials. (RGSHW). - Phoenix Hoyle | Library

Instructions

Complete the formative and make a set of bullet points on 

a) composite materials -  include descriptions and examples and their uses.
b) smart materials - include descriptions and examples and their uses.

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14.2 Know that _______________  are made from materials that have different  _______________ that combine to make a more useful material

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Houses

Streets

composites

properties

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14.3 Know that a composite is formed of a ___________  material and a reinforcement material

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Star wars

Star trek

matrix

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Cement is the ___________  
The rocks or iron bars are used for the __________________ .

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Matrix

reinforcement

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Label the diagram.

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Carbon fibre - reinforcement

Concrete - matrix

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A composite is any material made of at least two other materials.

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Iron bar reinforcement

Concrete matrix

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The carbon fibres are the ___________________ .
The glue (polymer) is the ___________ 

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matrix

Reinforcement

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Other types of composites exist.

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Bendable for comfort

Water resitant

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Change colour
Affected by heat
Affected by light

Similarity
Differences

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 ______________________________  are metal alloys that can remember their shape when heated. These alloys have been utilised on ______________  frames that spring back to shape if they are squashed.
Nickel titanium (nitinol) is a type of SMA, and it contracts when heated, whereas most metals expand. When braces are made from nitinol, they heat up in the mouth and ‘pull’ on the teeth, so they move with the nitinol. (https://youtu.be/XPrg8EZlD1E)
__________________  (https://youtu.be/VqSYnEBAL-c) pigments change colour when their temperature changes. The term ‘thermo’ relates to heat, and chroma means colour - so thermochromic pigments change colour when they are heated up. These pigments can be mixed with paint or polymers to give the materials the same colour-changing properties as the pigment. An example of this technology is seen on _________________________  or bath items for children. 

Other Answer Choices:

Shape-memory alloys (SMA)

colour-changing mugs

Thermochromic

spectacle

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_________________  pigments ( https://youtu.be/xdND71k8Rvw ) work in a similar way but 'photo' refers to light - so these pigments change their properties when exposed to ultraviolet (UV) light. A well-known example would be glasses where the lenses are clear when worn inside a building, but become more like _______________  when exposed to bright sunlight outside. The same technology has been used in windows to prevent rooms from getting too hot in warm weather.
_________________________________  (QTC)  ( https://youtu.be/DNpIPdvZ91k ) is an insulating rubber containing tiny particles of metal. When squashed, the metal particles meet and allow the flow of electrical current. As a result, QTC is an ______________  when resting and a ______________  when pressure is applied. It is often used in outdoor applications where water might otherwise damage tiny microswitches. It has been used in clothing to control ________________  and portable music players, in power tools to give variable speed controls and in touch-sensitive pads. 

Other Answer Choices:

insulator

Quantum-tunnelling composite

conductor

sunglasses

Photochromic

smartphones

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___________________________  have the ability to repair themselves, which can extend the lifespan of the products that use them. These include polymers that can heal knife cuts in themselves, metals that resist ______________      and concrete that can heal when cracked.
________________  can be formed by a magnetic field and are being used in hydraulic suspension pistons, with the strength of the _____________  field allowing the suspension to be hard or soft depending on what is necessary. They also have friction reducing properties allowing magnetic objects to glide across the surface.
______________(https://youtu.be/lEvVcaEmjjo)  is a polymer that becomes malleable when heated to about 62°C. When it cools down it becomes hard enough to drill and cut. This makes it perfect for ______________  as it can be reheated and formed again. It is also excellent for creating ergonomic handles.

Other Answer Choices:

magnetic

Polymorph

modelling

corrosion

Self-healing materials

Ferrofluids

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Thermochromic - changes colour due to changing temperature

Photochromic - changes colour due to changing light

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https://youtu.be/p1Ggc8anKm4 

Other Answer Choices:

Hydrogel

Structure has cross links and a structure that can absorb water.