arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1303.7348cond-mat.soft
收藏

嵌段共聚物膜中层状结构的稳定性和取向性

Stability and Orientation of Lamellae in Diblock Copolymer Films

Vanessa Weith, Alexei Krekhov, Walter Zimmermann

摘要:

用平均场模型研究了嵌段共聚物中微相分离和层状结构取向的动力学。层状结构的形成和它们的稳定状态进行了探讨,它表明,层状结构是稳定的,不仅为对应于自由能的最小值的结构的周期。稳定λ的波长范围是由一个功能的方法,介绍了这项工作,这是在协议的线性稳定性分析的结果。通过对自由能的广泛分析,研究了嵌段共聚物与限制平面边界的相互作用对层状取向的影响。通过改变在一个边界处的表面性质,发现相对于边界从优先垂直到平行层状取向的过渡,这与边界之间的距离无关。计算机模拟表明,层状取向顺序动力学,这是定量表征的取向序参量和结构因子方面的时间尺度,取决于显着的限制边界的属性,以及对淬火深度。

英文摘要:

The dynamics of microphase separation and the orientation of lamellae in diblock copolymers is investigated in terms of a mean-field model. The formation of lamellar structures and their stable states are explored and it is shown that lamellae are stable not only for the period of the structure corresponding to the minimum of the free energy. The range of wavelengths of stable lamellae is determined by a functional approach, introduced with this work, which is in agreement with the results of a linear stability analysis. The effects of the interaction of block copolymers with confining plane boundaries on the lamellae orientation are studied by an extensive analysis of the free energy. By changing the surface property at one boundary, a transition from a preferentially perpendicular to a parallel lamellar orientation with respect to the boundaries is found, which is rather independent of the distance between the boundaries. Computer simulations reveal, that the time scale of the lamellar orientational order dynamics, which is quantitatively characterized in terms of an orientational order parameter and the structure factor, depends significantly on the properties of the confining boundaries as well as on the quench depth.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑