Droplets of structured fluid on a flat substrate
Droplets of structured fluid on a flat substrate
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DOI：
10.1039/b905163e
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发表时间：
2009-01-01
期刊：
影响因子：
3.4
通讯作者：
Matsen, Mark W.
中科院分区：
文献类型：
--
作者：
Kim, Jaeup U.;Matsen, Mark W.
研究了对称AB型两嵌段共聚物液滴在平板上的平衡形态。使用自洽场理论（SCFT），我们提供了第一个预测的平衡液滴的形状和内部结构。当A组分的基底亲和力η（A）小时，液滴采用与简单流体非常相似的近似球形形状。然而，在球形液滴内部，同心圆形层状层堆叠在彼此的顶部上;因此液滴的厚度有效地由半整数或整数层量化。在较大的hA和较小的接触角下，最上层的面积变得相对较大，导致几乎平坦的多面顶表面，随后是半球形斜面。这种几何形状是显着的近晶液晶观察到的液滴形状的回忆。
We study the equilibrium morphology of droplets of symmetric AB diblock copolymer on a flat substrate. Using self-consistent field theory (SCFT), we provide the first predictions for the equilibrium droplet shape and its internal structure. When the substrate affinity for the A component, eta(A), is small, the droplet adopts a nearly spherical shape much like that of simple fluids. Inside the spherical droplet, however, concentric circular lamellar layers stack on top of each other; hence the thickness of the droplet is effectively quantized by a half-integer or integer number of layers. At larger hA and smaller contact angle, the area of the upper-most layer becomes relatively large, resulting in a nearly flat, faceted top surface, followed by a semi-spherical slope. This geometry is remarkably reminiscent of the droplet shapes observed with smectic liquid crystals.