来源网址：http://www.rsoau.com 2019-03-27 15:05:03
Corn starch is commonly known as Six Grain Flour. White microstrip light yellow powder. Corn was impregnated with 0.3% sulfite, and then processed by crushing, sieving, precipitation, drying and grinding. Common products contain a small amount of fat and protein.
Special characteristics of corn starch: corn starch with water has a strange characteristic: it will harden by rapid impact, but not by slow impact. Mixing corn starch and water at a weight ratio of about 3:2 and mixing evenly, the shear thickening fluid called "Euclidean splitting" oobleck is a non-Newtonian fluid.
1. Pour out about 5mL of the finished product on the palm, and rub it with both hands to make the original liquid product into a ball-like solid ball. After stopping rubbing for about half a second, the ball will quickly "melt" and return to the liquid state. This special property can be demonstrated by repeated rubbing.
2. Place about 50-100mL of finished products in the wash-free paper cup. Use the wash-free paper cup or plastic cup for lightweight and easy operation. First, gently tilt the paper cup to show the participants the liquid products inside the cup. Then quickly sprinkle the finished products inside the cup to the audience. This phenomenon can make participants impressed.
3. Place the finished product of about 50-100mL in the wash-free paper cup, gently tilt the cup to show participants the finished product of liquid inside the cup, then reverse the wash-free cup, but swing it up and down quickly for a distance, and then return the cup. At this time, because the non-Newtonian fluid has the power to resist the rapid shear strain, the finished product in the cup will not spill out.
4. Place several liters of finished products in a large shallow basin. Participants can quickly run through the finished products in the shallow basin without sinking. If they walk slowly, they will sink into the finished products. 5. Place 50-100mL finished products on the upward sound horn vibration film, open a certain volume of low-frequency sound wave vibration and observe the distortion of the processed products.