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Magic Sand Vanderbilt Student Volunteers for Science Magic Sand Vanderbilt Student Volunteers for Science

Magic Sand Vanderbilt Student Volunteers for Science - PowerPoint Presentation

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Uploaded On 2022-06-28

Magic Sand Vanderbilt Student Volunteers for Science - PPT Presentation

Fall 2013 I Background Since sand can get wet it means that the water molecules are attracted to the sand grains Waterloving property of sand is called hydrophilic Magic sand is regular sand covered with an oillike substance that is waterhating or ID: 927928

water sand oil magic sand water magic oil explain stick hydrophobic add bottle regular cup dropper properties spoon attracted

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Presentation Transcript

Slide1

Magic Sand

Vanderbilt Student Volunteers for Science

Fall 2013

Slide2

I. Background

Since sand can get wet, it means that the water molecules are attracted to the sand grains.

Water-loving property of sand is called

hydrophilic

.

Magic sand is regular sand covered with an oil-like substance that is water-hating or

hydrophobic

.

Slide3

II. Activities

Demonstration:

show that water and oil don’t mix.

Shake the bottle containing the oil and water.

Explain that the oil on top is

hydrophobic.

Slide4

Investigating Hydrophobic and Hydrophilic Properties

Use the 1-oz dropper bottle to add

two drops

onto the magic sand spoon (red) and regular sand spoon.

Tilt the spoons.

The water on the magic sand spoon will not stick. But the water will stick on the regular sand.

Explain that the magic sand is like the oil (hydrophobic); it will not stick to water.Explain that the regular sand is hydrophilic, therefore the water molecules are attracted to the sand grains and soak into it.

Slide5

Nanotechnology

Explain that a nanometer is a billionth of a meter.

Provide examples of different objects at the

nanoscale

.

Ordinary materials have different properties at the

nanoscale. Show the Nano-Tex fabric.Explain how nanotechnology has allowed the development of stain resistance.

Slide6

More Activities

Use the dropper bottle to add water to the 1

oz

cup.

Sprinkle magic sand on top of the water in the cup.

Take the popsicle stick and slowly push through the layer of magic sand.

Explain why the stick isn’t wet. Add 2 drops of water onto the sand in the cup. Keep adding until a large drop of water forms.Explain why the droplet forms.

Slide7

More Activities (cont.)

Mix the magic sand and water.

Ask what the magic sand looks like (should have a silvery sheen).

Carefully

pour off the water from the sand into the waste container.

Make sure to leave the sand in the cup behind!

Slide8

Magic Sand and Oil

Use 1

oz

dropper bottle to add

2 drops

of the oil onto the magic sand. Explain why the oil soaks into the sand.

The oil and the magic sand have similar properties (hydrophobic). This means that the oil is attracted to the magic sand and will soak into it.

Slide9

Clean-Up

If the magic

sand has

not

been contaminated, the teacher can keep it.

Place the 1oz cups with contaminated sands into the trash bag and dispose of it.