科研之友
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摘要
Microstructures in the dual-and three-level hierarchical templates are replicated on the surfaces of large-sized polypropylene (PP) samples using microinjection-compression molding (mu-ICM) in a single step. Results indicate that the single- and dual-level structured surfaces can be molded via the former template under lower and higher compression forces, respectively. The single-level micro blade structure yields an increase in static contact angle (CA) from the intrinsic value of the PP (85.0 degrees) to 134.2 degrees on the molded surface. The dual-level structure involving micro blades and micro pyramids results in the lotus-leaf effect (CA > 150 degrees, rolling angle RA < 5 degrees) on the surface. The 250 mu m diameter micro columns, the top surfaces of which show the aforementioned dual-level microstructure, are uniformly distributed on the three-level hierarchical surface molded via the later template. The CA and RA values on this surface are 164.5 degrees and above 90 degrees, respectively. Thus a functional surface displaying the petal effect is obtained. The high level of RA is resulted from the localized noncomposite wetting state near the upper edge of micro columns. This work gives an insight into the design, manipulation and mass production of superhydrophobic surface.
- 出版日期2013-10-20
- 单位华南理工大学
