| Abstract
| - Arrays of surface wrinkles of linearly increasing heights (from tens of nanometers to tens ofmicrometers) were prepared via a spontaneous reaction−diffusion process based on periodic precipitation.The slopes, dimensions, and positions of the precipitation bands could be controlled precisely by adjustingthe concentrations of the participating chemicals as well as the material properties of patterned substrates.Additional control of periodic precipitation by localized UV irradiation allowed for the preparation ofdiscontinuous and curvilinear structures. The nonbinary 3D surface topographies were replicated into poly(dimethylsiloxane), and the applications of replicas in microfluidics, microseparations, and cell biology havebeen suggested.
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