Electric Field Induced Selective Disordering in Lamellar Block Copolymers
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- 作者：Markus Ruppel ; Christian W. Pester ; Karol M. Langner ; Geert J. A. Sevink ; Heiko G. Schoberth ; Kristin Schmidt ; Volker S. Urban ; Jimmy W. Mays ; Alexander B枚ker
- 刊名：ACS Nano
- 出版年：2013
- 出版时间：May 28, 2013
- 年：2013
- 卷：7
- 期：5
- 页码：3854-3867
- 全文大小：928K
- 年卷期：v.7,no.5(May 28, 2013)
- ISSN：1936-086X
文摘
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鈥揹isorder 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鈥揹isorder transition and well below it.