Ultra-long lifetime water bubbles stabilized by negative pressure generated between microparticles,Soft Matter

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Ultra-long lifetime water bubbles stabilized by negative pressure generated between microparticles
Soft Matter ( IF 2.9 ) Pub Date : 2017-10-16 00:00:00 , DOI: 10.1039/c7sm01684k
Jin Yang _{1,

2,

3,

4} , Ao Wang _{1,

2,

3,

4} , Quanshui Zheng _{1,

2,

3,

4}

Affiliation

Bubbles blown up from a water surface can only last for seconds before bursting due to gravity, surface tension and evaporation. Although adding certain surfactants and depressing evaporation can significantly extend the bubbles’ lifetime, there is still no method to prevent the bubble film from getting thinner and avoid the effects of evaporation. Here we report our experimental observation that centimeter length scale water bubbles can last for over a month at room temperature in the open natural environment with evaporation if they are covered with densely distributed microparticles on the bubble top surface. The underlying stability mechanism to balance out evaporation water loss is revealed to be the existence of negative pressure in the water between the two water–air interfaces of the film of the bubbles. This negative pressure is generated by surface tension of the locally curved water–air interfaces spanned over the particles and acts against gravity to suck water up from the water bulk and self-adaptively compensate the water loss due to evaporation. A theoretical model of the above water supplementary mechanism is built and computed numerically using Surface Evolver. A three-dimensional fluorescence experiment is also designed to verify the above water transfer process. This mechanism is generally valid for making ultra-long lifetime bubbles not only with water, but also for other liquids and suitable particles that satisfy certain contact angle requirements.

中文翻译：

微粒之间产生的负压可稳定超长寿命的气泡

由于重力，表面张力和蒸发，从水表面吹出的气泡只能持续几秒钟，然后破裂。尽管添加某些表面活性剂并抑制蒸发可以显着延长气泡的寿命，但仍然没有方法可以防止气泡膜变薄并避免蒸发的影响。在这里，我们报告了我们的实验观察结果，如果在气泡自然表面上覆盖有密集分布的微粒，那么在室温下，在开放的自然环境中，厘米尺度的水泡可以持续一个月以上的蒸发。平衡蒸发水分损失的基本稳定机制被发现是气泡膜的两个水-空气界面之间的水中存在负压。这种负压是由分布在颗粒上的局部弯曲的水-空气界面的表面张力产生的，并抵抗重力将水从水团中吸走，并自适应地补偿了由于蒸发引起的水分流失。建立了上述补水机理的理论模型，并使用Surface Evolver进行了数值计算。还设计了三维荧光实验，以验证上述水转移过程。这种机制通常不仅可用于制造超长寿命的气泡，而且还可用于制造满足某些接触角要求的其他液体和合适的颗粒。

更新日期：2017-11-15

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