Converting the nanodomains of a diblock-copolymer thin film from spheres to cylinders with an external electric field.
Converting the nanodomains of a diblock-copolymer thin film from spheres to cylinders with an external electric field.
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DOI：
10.1063/1.2170082
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发表时间：
2006-02
期刊：
影响因子：
--
通讯作者：
M. Matsen
中科院分区：
文献类型：
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作者：
M. Matsen
我们研究了外加电场将两嵌段共聚物薄膜的形态从嵌入在基质中的单层球形微区转变为穿透基质的圆柱形微区的能力。正如预期的那样，外加磁场增加了圆柱形磁区的相对稳定性，同时减少了阻碍向圆柱形转变的能垒。通过两个嵌段共聚组分之间的大介电对比度，特别是当低介电对比度组分形成基质时，增强了场的有效性。此外，通过选择在组成上尽可能对称的球状两嵌段共聚物，能量屏障被最小化。我们的计算是迄今为止在数量上最可靠的，使用了基于自洽场理论的精确的数值谱算法，并辅之以对线性介质材料的精确处理。
We investigate the ability of an applied electric field to convert the morphology of a diblock-copolymer thin film from a monolayer of spherical domains embedded in the matrix to cylindrical domains that penetrate through the matrix. As expected, the applied field increases the relative stability of cylindrical domains, while simultaneously reducing the energy barrier that impedes the transition to cylinders. The effectiveness of the field is enhanced by a large dielectric contrast between the two block-copolymer components, particularly when the low-dielectric contrast component forms the matrix. Furthermore, the energy barrier is minimized by selecting sphere-forming diblock copolymers that are as compositionally symmetric as possible. Our calculations, which are the most quantitatively reliable to date, are performed using a numerically precise spectral algorithm based on self-consistent-field theory supplemented with an exact treatment for linear dielectric materials.