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(Color) (a)–(c) AFM micrographs of PS-coated silicone sheet as a function of strain. (a) At zero strain, the surface is flat. (b) At a strain of 0.010 (arrows show compression direction), the surface abruptly wrinkles with an amplitude and wavelength of 0.08 and , respectively. (c) At a strain of 0.073, the amplitude has nonlinearly increased to . (d) Amplitude vs strain as measured from AFM images [data indicated by red circles, fit in black]. Amplitude calculated from model is shown in blue. The experimental uncertainty, taken as one standard deviation, is comparable to symbol size.
(Color) Normalized SALS data as a function of strain . The zeroth, first, second, and third orders (red, green, blue, and orange, respectively) can be seen to cycle through maxima and minima as the strain (hence, amplitude ) increases.
(Color) (a) Normalized intensities of the zeroth-, first-, second-, and third-order diffraction peaks (plotted in red, green, blue, and orange, respectively) as a function of wrinkling amplitude. Each order exhibits at least one minima. The zeroth order has decreased by three orders of magnitude at its point of minimum intensity . (b) Modeled diffraction pattern showing good agreement with data.
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