Electric field induced selective disordering in lamellar block copolymers.

Electric field induced selective disordering in lamellar block copolymers.
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电场诱导层状嵌段共聚物的选择性无序

DOI:
10.1021/nn3059604
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发表时间:
2013
期刊:
影响因子:
17.1
通讯作者:
Böker A.
Böker A.
中科院分区:
材料科学1区
文献类型:
--
作者:
Ruppel;Pester;Langner;Sevink;Schoberth;Schmidt;Böker A.

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外部电场通过晶粒的旋转或成核和生长来排列纳米结构的嵌段共聚物,这取决于化学上不同的嵌段共聚物组分被分离的强度。在有序-无序转变附近,理论和模拟提出了第三种机制:选择性无序。我们提出了一个时间分辨的小角度X射线散射研究,演示了如何电场确实可以选择性地分解不良排列lameries在溶致嵌段共聚物溶液中,而lameries与平行于所施加的电场取向的界面占上风。本研究增加了一个额外的机制,实验证实的套件的机械路径,纳米结构的嵌段共聚物可以与电场对齐。我们的研究结果进一步揭示了电场辅助退火的好处,以减轻取向无序和拓扑缺陷的嵌段共聚物中间相,无论是在附近的有序-无序过渡,并远远低于它。
External electric fields align nanostructured block copolymers by either rotation of grains or nucleation and growth depending on how strongly the chemically distinct block copolymer components are segregated. In close vicinity to the order–disorder transition, theory and simulations suggest a third mechanism: selective disordering. We present a time-resolved small-angle X-ray scattering study that demonstrates how an electric field can indeed selectively disintegrate ill-aligned lamellae in a lyotropic block copolymer solution, while lamellae with interfaces oriented parallel to the applied field prevail. The present study adds an additional mechanism to the experimentally corroborated suite of mechanistic pathways, by which nanostructured block copolymers can align with an electric field. Our results further unveil the benefit of electric field assisted annealing for mitigating orientational disorder and topological defects in block copolymer mesophases, both in close vicinity to the order–disorder transition and well below it.
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