Basic physical concepts in food matrices - Solid states in food systems
5 important questions on Basic physical concepts in food matrices - Solid states in food systems
Which 2 physical states are there in solid systems?
- Crystalline
- Amorphous
What is the difference the between crystalline and amorphous state?
- Crystalline material --> atomic order at large scale
- Amorphous --> no specific ordering of the atoms in the material
How are crystalline and amorphous materials made?
- Slow cooling --> atoms in material have time to order themselves --> crystalline state is formed
- Faster cooling --> molecules slow down fast enough to prevent ordering of the molecules --> amorphous state
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What happens when you heat up a crystalline material?
What happens when you heat up an amorphous material?
- The disordered arrangement of the solid material can rearrange.
- Above the glass temperature, the ability for rearrangement is high enough for it to move, and the material is called a rubber.
- Even higher T (melting temperature) --> convert into a crystalline state, where the molecules have an ordered arrangement
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