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Syllabus content:
Syllabus content:
• The working properties, common uses and environmental impact of the following:
– nanomaterials ○ oleophobic coatings ○ hydrophobic materials
– metal foams
– super alloys
– bioplastics ○ starch-based ○ sugar-based ○ cellulose-based.
A modern material is one that has been engineered to have improved properties.
A modern material is a material that has been engineered to have improved properties.
nano materials
nano materials
**Still need to write about oleophobic coatings ○ hydrophobic materials
Chameleon Nanoflakes
Chameleon Nanoflakes
This material consists of nano-size silicon flakes each covered with a Titanium compound. The flakes possess amazing light scattering properties if mixed with clear varnishes or polymers. They can have a variety of uses but are commonly used to spray cars for a ‘two-tone’ effect.
Changes colour when viewed at different angles
Changes colour when viewed at different angles
Metal Foams
Metal Foams
Developments in metal have resulted in foamed metals. Aluminium can be foamed in much the same way as polymers like Polystyrene. It results in a lightweight material that can be sandwiched between solid sheets for reduced weight. This allows for greater impact resistance; the solid sheet absorbs the impact which is dispersed through the foam. They can also be used for filtration of gas and liquid where higher temperatures would cause damage to a polymer based foam filter.
Super alloys
Super alloys
*
Biopolymers
Biopolymers
Can also be referred to as biodegradable plastics.
Conventional oil-based plastics do not break down easily and, since the bulk of domestic waste comes from this source, they have a significant and negative effect on the environment.
Biodegradable plastics are designed to break down under the right conditions.
Biodegradable plastics are designed to break down under the right conditions.
The majority of biodegradable plastics are derived entirely from renewable sources.
Starch based polymers are produced from wheat, corn and potatoes (Potatopak).
Polylactide (PLA) is a type of biodegradable plastic used for packaging, gardening products and even some disposable nappies.
They are also used in medical implants and sutures for their ability to dissolve harmlessly into the body over time.
This instructional video explains how corn is made into biodegradable polymers.
Here is a video showing in more detail how biodegradable polymers and analysis of them as a 'better' alternative..
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