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Ice Cream nano Nanocamp  		June 27, 2012		Chris Marin Ice Cream nano Nanocamp  		June 27, 2012		Chris Marin

Ice Cream nano Nanocamp June 27, 2012 Chris Marin - PowerPoint Presentation

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Uploaded On 2018-11-09

Ice Cream nano Nanocamp June 27, 2012 Chris Marin - PPT Presentation

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

cream ice shape liquid ice cream liquid shape nitrogen definite atoms colloid places crystals controlling solid fixed change cold

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Presentation Transcript

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!