Dewetting of thin films on heterogeneous substrates: pinning versus coarsening.
Dewetting of thin films on heterogeneous substrates: pinning versus coarsening.
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异质基底上薄膜的去湿：钉扎与粗化。
DOI：
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发表时间：
2001
期刊：
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通讯作者：
M. Bär
中科院分区：
文献类型：
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作者：
L. Brusch;H. Kühne;U. Thiele;M. Bär
本文研究了周期性异质衬底（模板）上的液膜脱湿模型。获得稳定的周期性条纹图案所需的条纹模板不均匀性的幅度和周期性，即，pinning计算。这需要在均匀衬底上的薄膜的去湿期间驱动典型的粗化动力学的纵向和横向模式的稳定。如果非均匀性具有比临界去湿模式更大的空间周期，则弱非均匀性足以进行钉扎。我们的研究结果意味着一个大的区域之间的共存粗化动力学和钉扎。
We study a model for a thin liquid film dewetting from a periodic heterogeneous substrate (template). The amplitude and periodicity of a striped template heterogeneity necessary to obtain a stable periodic stripe pattern, i.e., pinning, are computed. This requires a stabilization of the longitudinal and transversal modes driving the typical coarsening dynamics during dewetting of a thin film on a homogeneous substrate. If the heterogeneity has a larger spatial period than that of the critical dewetting mode, weak heterogeneities are sufficient for pinning. Our results imply a large region of coexistence between coarsening dynamics and pinning.