Gonuguntla Manoj, Sharma Ashutosh, Sarkar Jayati, Subramanian Subash A, Ghosh Moniraj, Shenoy Vijay
Department of Chemical Engineering, Indian Institute of Technology Kanpur, UP 208016, India.
Phys Rev Lett. 2006 Jul 7;97(1):018303. doi: 10.1103/PhysRevLett.97.018303.
Based on experiments and 3D simulations, we show that a soft elastic film during adhesion and debonding from a rigid flat surface undergoes morphological transitions to pillars, labyrinths, and cavities, all of which have the same lateral pattern length scale, lambda close to lambda/H approximately 3 for thick films, H > 1 microm . The linear stability analysis and experiments show a new thin film regime where lambda/H approximately equal to 3 + 2pi(lambda/3 muH)1/4 (gamma is surface tension, mu is shear modulus) because of a significant surface energy penalty (for example, lambda/H approximately equal to 6 for H = 200 nm; mu = 1 MPa).
基于实验和三维模拟，我们表明，在与刚性平面粘附和脱粘过程中，软弹性薄膜会发生形态转变，形成柱状、迷宫状和空洞状结构，所有这些结构具有相同的横向图案长度尺度，对于厚膜（H>1微米），λ接近λ/H约为3。线性稳定性分析和实验表明，由于显著的表面能惩罚（例如，对于H = 200纳米；μ = 1兆帕，λ/H约为6），存在一种新的薄膜状态，其中λ/H约等于3 + 2π(λ/3μH)^(1/4)（γ为表面张力，μ为剪切模量）。
