研究目的
To investigate the impact of pre-strain stress and laser fluence on the direction and wavelength of wrinkles on PDMS surface, and to propose a model for tuning the pattern of wrinkles.
研究成果
Pre-straining is essential for patterning wrinkles on PDMS surface. Wavelength and amplitude of wrinkles can be controlled by adjusting laser power and pre-strain stress. A mechanical instability model explains the formation of wrinkles.
研究不足
The pre-strain stress must be controlled well to avoid cracks. The method is limited by the tensile strength of the modified PDMS.
1：Experimental Design and Method Selection:
A nano-second laser was used with pre-strain stress to prepare tunable wrinkles on PDMS surface. The impact of pre-strain stress and laser fluence on wrinkles was investigated.
2：Sample Selection and Data Sources:
PDMS samples were prepared and treated with laser under varying pre-strain stresses and laser powers. SEM images were used to analyze the results.
3：List of Experimental Equipment and Materials:
HT-20F laser (wavelength of 1064nm, pulse width of 20ns, frequency of 30KHz, laser spot diameter of 20μm), PDMS (Sylgard 184 from Dow corning).
4：Experimental Procedures and Operational Workflow:
PDMS samples were stretched to form pre-strain, laser was scanned over the surface, samples were cleaned and dried, then imaged with SEM.
5：Data Analysis Methods:
SEM images were processed with ImageJ to calculate the wavelength of the wrinkles pattern.
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