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2016 ; 6
(ä): 28574
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Self-Propelled Hovercraft Based on Cold Leidenfrost Phenomenon
#MMPMID27338595
Shi M
; Ji X
; Feng S
; Yang Q
; Lu TJ
; Xu F
Sci Rep
2016[Jun]; 6
(ä): 28574
PMID27338595
show ga
The Leidenfrost phenomenon of liquid droplets levitating and dancing when placed
upon a hot plate due to propulsion of evaporative vapor has been extended to many
self-propelled circumstances. However, such self-propelled Leidenfrost devices
commonly need a high temperature for evaporation and a structured solid substrate
for directional movements. Here we observed a "cold Leidenfrost phenomenon" when
placing a dry ice device on the surface of room temperature water, based on which
we developed a controllable self-propelled dry ice hovercraft. Due to the
sublimated vapor, the hovercraft could float on water and move in a programmable
manner through designed structures. As demonstrations, we showed that the
hovercraft could be used as a cargo ship or a petroleum contamination collector
without consuming external power. This phenomenon enables a novel way to utilize
programmable self-propelled devices on top of room temperature water, holding
great potential for applications in energy, chemical engineering and biology.