The determining role of three-phase contact mobility and contact angle magnitude in the selectivity of a flotation process

1985 ◽  
Vol 263 (1) ◽  
pp. 75-80 ◽  
Author(s):  
R. Varbanov
Keyword(s):  
Contact Angle ◽  
Phase Contact ◽  
Flotation Process ◽  
Three Phase

Microstructure and Wettability on the Elytral Surface of Aquatic Beetle

2013 ◽  
Vol 461 ◽  
pp. 731-740 ◽  
Author(s):  
Ming Xia Sun ◽  
Ai Ping Liang ◽  
Gregory S. Watson ◽  
Jolanta A. Watson ◽  
Yong Mei Zheng ◽  
...  
Keyword(s):  
Contact Angle ◽  
Contact Angles ◽  
Vital Role ◽  
Butterfly Wing ◽  
Scanning Microscope ◽  
Optical Contact ◽  
Three Phase ◽  
Aquatic Beetle ◽  
Wing Scales

The microstructures on elytral surface of aquatic beetles belonging to Hydrophilidae and Dytiscidae were observed under an environment scanning microscope, and the wettabilities were determined with an optical contact angle meter. The results show the elytral surfaces are relatively smooth compared to the structures of other insects such as the butterfly wing scales or cicada wing protrusions. They exhibit a polygonal structuring with grooves and pores being the main constituent units. The contact angles (CAs) range from 47.1oto 82.1o. The advancing and receding angles were measured by injecting into and withdrawing a small amount of water on the most hydrophilic (with a contact angle of 47.1o) and hydrophobic (with a contact angle of 82.1o) elytral surfaces, which illustrates the vital role of three-phase contact line (TCL) in the wetting mechanism of aquatic beetle elytral surfaces.

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