期刊
JOURNAL OF MICROMECHANICS AND MICROENGINEERING
卷 20, 期 3, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0960-1317/20/3/035018
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资金
- Ministry of Commerce, Industry and Energy Republic of Korea [20060150000]
- National Research Foundation of Korea [2007-00158] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We present the replication of polyethylene (PE) nano-micro hierarchical structures and their application for superhydrophobic surfaces. A commercial ultrasonic welding system was used to apply ultrasonic vibration energy to the forming of nano-micro hierarchical structures. To evaluate ultrasonic formability, Ni nanomold and nano-micro hierarchical mold were designed and fabricated. The optimal weld times were 1.5 s and 3.0 s for PE nanoprotrusions and nano-micro hierarchical structures, respectively. The forming process was conducted at atmospheric pressure. The PE structures were well replicated without a vacuum. The trapped air in the microcavity of the nano-micromold was dispersed and absorbed into the molten PE. Ultrasonic nano-microreplication technology showed an extremely short processing time and did not require a vacuum environment. To investigate the applicability of ultrasonic forming, the fabricated nanoprotrusions and nano-micro hierarchical structures were coated with plasma polymerized fluorocarbon (PPFC) of a hydrophobic nature and were applied to modify superhydrophobic surfaces. The contact angle was increased from 106 degrees (smooth surface) to 125 degrees (nanostructured surface) and finally to 160 degrees (nano-microstructured surface) so that the surface became superhydrophobic.
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