非牛顿流体：欧布莱克

用玉米淀粉和水制备剪切增稠流体

Classroom Demonstrations Beginner (Middle School) 20 分钟 ~$3.00

目标

制备并探索根据施加力的不同可表现为固体或液体的非牛顿流体。

背景

Oobleck is a suspension of cornstarch in water that exhibits shear-thickening (dilatant) behavior. Under slow, gentle force, it flows like a liquid. Under sudden, strong force, the starch particles jam together and it behaves like a solid. This non-Newtonian behavior occurs because the starch particles are suspended at a critical concentration where they can rearrange under slow stress but lock together under rapid stress. The name comes from the Dr. Seuss book 'Bartholomew and the Oobleck.'

安全警告

  • Cornstarch is slippery when wet — clean up spills immediately
  • Do not pour oobleck down the drain — it will clog pipes
  • Non-toxic but not for consumption

材料

  • Cornstarch (400 g)
    About 2 cups
  • Water (250 mL)
    About 1 cup
  • Food coloring (5 drops)
    Optional

设备

Large mixing bowl Spoon Plastic sheet or tray (to contain mess) Speaker with subwoofer (optional, for vibration demo)

步骤

1

Place the mixing bowl on the plastic sheet. Add the cornstarch to the bowl.

2 分钟
2

Slowly add water while mixing with your hands. The ideal ratio is about 1.5–2 parts cornstarch to 1 part water. Add water gradually until the mixture is the consistency of thick honey.

5 分钟
3

Test 1 (Slow force): Gently dip your hand in and slowly pull it out. The oobleck flows like a liquid.

3 分钟
4

Test 2 (Fast force): Punch the surface hard. Your fist bounces off as if hitting a solid.

3 分钟
5

Test 3 (Shaping): Squeeze a handful quickly into a ball. When you stop squeezing, it melts back into liquid.

3 分钟
6

Optional: Place the bowl on a speaker playing low-frequency bass. The oobleck forms standing wave patterns and finger-like protrusions.

4 分钟 Protect the speaker with plastic wrap

预期结果

The oobleck flows under gentle handling but solidifies under impact. It can be rolled into a ball that melts in your palm. On a vibrating speaker, it forms dramatic standing wave patterns.

清理

Let oobleck dry and scrape off surfaces. Do NOT wash down drains. Dispose of dried oobleck in trash. Wipe surfaces with damp cloth.

详情

类别
Classroom Demonstrations
难度
Beginner (Middle School)
时长
20 分钟
预估费用
$3.00
步骤数
6
材料
3

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Frequently Asked Questions

What is the objective of 非牛顿流体：欧布莱克?
制备并探索根据施加力的不同可表现为固体或液体的非牛顿流体。
How difficult is 非牛顿流体：欧布莱克?
This experiment is rated as Beginner (Middle School). It takes approximately 20 minutes to complete.
What safety precautions are needed for 非牛顿流体：欧布莱克?
Key safety precautions include: Cornstarch is slippery when wet — clean up spills immediately; Do not pour oobleck down the drain — it will clog pipes; Non-toxic but not for consumption.
What materials are needed for 非牛顿流体：欧布莱克?
The main materials required are: Cornstarch, Water, Food coloring.
What results should I expect from 非牛顿流体：欧布莱克?
The oobleck flows under gentle handling but solidifies under impact. It can be rolled into a ball that melts in your palm. On a vibrating speaker, it forms dramatic standing wave patterns.