State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China and Kavli Institute for Theoretical Physics China, Beijing 100190, China and Center of Soft Matter Physics and Its Applications, Beihang University, Beijing, China.
Center of Soft Matter Physics and Its Applications, Beihang University, Beijing, China.
Phys Rev Lett. 2014 Aug 29;113(9):098301. doi: 10.1103/PhysRevLett.113.098301. Epub 2014 Aug 25.
When a droplet of a soft matter solution is dried, cavities are often formed in the droplet, giving a hollow sphere in the end. A theoretical model is given for this phenomenon. It is shown that the formation of a gel-like layer (skin layer), which has a finite shear modulus, is essential for the phenomenon to take place. The condition for cavity formation (how it depends on the shear modulus and thickness of the skin layer), and the variation of the droplet volume and cavity volume after the cavity formation are examined.
当一滴软物质溶液被干燥时，液滴中常常会形成空腔，最终形成一个空心球体。本文提出了一个关于这种现象的理论模型。研究表明，形成具有有限剪切模量的凝胶状层（皮层）对于发生这种现象至关重要。本文还研究了空腔形成的条件（它如何取决于皮层的剪切模量和厚度），以及空腔形成后液滴体积和空腔体积的变化。
