What is a liquid All liquids have a definite volume conform to the shape of container are not compressible are made up of atoms that arent in fixed places What is a solid All solids have a definite volume ID: 724932
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Slide1
Ice Cream
nano
Nanocamp
June 27, 2012 Chris Marin Slide2
What is a liquid?
All liquids: have a definite volumeconform to the shape of container
are not compressibleare made up of atoms that aren’t in fixed placesSlide3
What is a solid?
All solids:have a definite volumehave a definite shape
are made up of atoms in fixed placesSlide4
What is ice cream??It has ice in the name, is it a solid?Not quite! See how it took the shape of the glass?
Is it a liquid?Not unless you wait to long!It’s both!Slide5
ColloidsA colloid is one phase mixed into another.
Ice cream is both a foam, emulsion, and sol!Slide6
So what is ice cream?In the above microscope image, A is air bubbles, C is ice crystals, F is fat, and S is a solution of liquid.
A big part of controlling ice cream’s texture is controlling how much air and ice are in the colloid. Slide7
nano-ice creamWe will be using liquid nitrogen to rapidly make ice cream
Normally, ice cream takes hours to make, but liquid nitrogen is extremely cold (-321 °F, or 77 K)The change in temperature when the liquid nitrogen is poured in should be so rapid that the cream doesn’t have time to change to iceInstead, tiny nanometer sized ice crystals should form, like snow does on a very cold day.This should make our ice cream very very smooth!