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cover of episode How does soap make bubbles?

How does soap make bubbles?

2025/2/6
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Moment of Um

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Frank Bates
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Frank Bates: 大家好,我是Frank Bates,明尼苏达大学的教授。我主要研究化学工程和材料科学。关于肥皂泡的形成,我的理解是这样的:首先,形成泡泡的关键是肥皂和水的结合,而且水中占绝大部分。肥皂泡实际上是非常薄的水膜,内外都被空气包围。纯水无法形成稳定的薄膜,但肥皂水可以。想象一下,在一大群人中,如果有一小部分人不喜欢拥挤,他们会跑到人群边缘形成边界,就像肥皂分子会跑到水和空气的边界形成表面层一样。这些肥皂分子会阻止水分子聚集成滴,从而保持薄膜的形状。肥皂越多,形成的薄膜就越薄。正是肥皂和水的这种结合,形成了能够产生肥皂泡的液态薄膜。

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We know how important it is to wash our hands with soap and warm water. Get between the fingers, under the nails, all that good stuff. But why does soap get all foamy when you add water? Where do those bubbles come from? We asked University of Minnesota professor Frank Bates to help us find the answer.

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