Неньютоновская жидкость: оублек
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Создание жидкости, увеличивающей вязкость при нагрузке, из кукурузного крахмала и воды
Цель
Приготовить и исследовать неньютоновскую жидкость, ведущую себя как твёрдое тело или жидкость в зависимости от приложенной силы.
Предпосылки
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.'
Предупреждения по безопасности
- 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
Материалы
-
Cornstarch (400 g)About 2 cups
-
Water (250 mL)About 1 cup
-
Food coloring (5 drops)Optional
Оборудование
Процедура
Place the mixing bowl on the plastic sheet. Add the cornstarch to the bowl.
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.
Test 1 (Slow force): Gently dip your hand in and slowly pull it out. The oobleck flows like a liquid.
Test 2 (Fast force): Punch the surface hard. Your fist bounces off as if hitting a solid.
Test 3 (Shaping): Squeeze a handful quickly into a ball. When you stop squeezing, it melts back into liquid.
Optional: Place the bowl on a speaker playing low-frequency bass. The oobleck forms standing wave patterns and finger-like protrusions.
Ожидаемые результаты
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.
Уборка
Let oobleck dry and scrape off surfaces. Do NOT wash down drains. Dispose of dried oobleck in trash. Wipe surfaces with damp cloth.
Детали
- Категория
- Classroom Demonstrations
- Сложность
- Beginner (Middle School)
- Продолжительность
- 20 мин
- Прим. стоимость
- $3,00
- Шаги
- 6
- Материалы
- 3