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ABSTRACT
Surface tension and friction are dominant forces at microscale. The friction and wear of solid–solid or solid–liquid contacts affect the performance and lifetime of a microgyroscope. In this paper, we propose a novel superoleophobic liquid-bearing microgyroscope, and present a simple method to fabricate a superoleophobic surface on a 2J85 ferromagnetic alloy substrate through hydrofluoric acid etching. The superoleophobic surfaces exhibit reduced viscous drag because of the ‘slip’ associated with a layer of air trapped at the liquid/solid interface. In addition, a drag reduction ratio of approximately 10.7% was observed at a high velocity.
Disclosure statement
No potential conflict of interest was reported by the authors.
Additional information
Funding
The work was sponsored by National Basic Research Program of China (No.2012CB934100), National Science Foundation of China (No. 61474034), Natural Science Foundation of Heilongjiang Province of China (NO: F201418), the Fundamental Research Funds for the Central Universities (Grant No. HIT.NSRIF.2014040, HIT.NSRIF.2013040).