School of Physics and Astronomy and Nottingham Nanotechnology and Nanoscience Centre, University of Nottingham, University Park, Nottingham NG7 2RD, UK.
Langmuir. 2010 Dec 7;26(23):18349-56. doi: 10.1021/la1036212. Epub 2010 Oct 28.
Patterned surfaces with microwrinkled surface structures were prepared by thermally evaporating thin aluminum (10-300 nm thick) (Al) layers onto thick prestrained layers of a silicone elastomer and subsequently releasing the strain. This resulted in the formation of sinusoidal periodic surface wrinkles with characteristic wavelengths in the 3-42 μm range and amplitudes as large as 3.6 ± 0.4 μm. The Al thickness dependence of the wrinkle wavelengths and amplitudes was determined for different values of the applied prestrain and compared to a recent large-amplitude deflection theory of wrinkle formation. The results were found to be in good agreement with theory. Samples with spatial gradients in wrinkle wavelength and amplitude were also produced by applying mechanical strain gradients to the silicone elastomer layers prior to deposition of the Al capping layers. Sessile water droplets that were placed on these surfaces were found to have contact angles that were dependent upon their position. Moreover, these samples were shown to direct the motion of small water droplets when the substrates were vibrated.
通过将厚度为 10-300nm 的薄铝（Al）层热蒸发到厚的预拉伸硅酮弹性体层上，然后释放应变，制备出具有微波纹表面结构的图案化表面。这导致形成具有特征波长在 3-42μm 范围内的正弦周期表面皱纹，幅度高达 3.6±0.4μm。对于不同的施加预应变量，确定了皱纹波长和幅度的 Al 厚度依赖性，并与最近的大振幅皱纹形成理论进行了比较。结果与理论吻合较好。通过在沉积 Al 覆盖层之前对硅酮弹性体层施加机械应变梯度，也制备了具有皱纹波长和幅度空间梯度的样品。放置在这些表面上的不流动的水滴被发现其接触角取决于它们的位置。此外，当基板振动时，这些样品被证明可以控制小水滴的运动。
