Drop transfer between superhydrophobic wells using air logic control

Abstract

Superhydrophobic surfaces aid biochemical analysis by limiting sample loss. A system based on wells here tolerated tilting up to 20° and allowed air logic transfer with evidence of mixing. Conditions for intact transfer on 15 to 60 μL drops using compressed air pressure operation were also mapped.

Concentrating nanoparticles in environmental monitoring

“…An electrical circuit devised to provide an audible alarm through a buzzer when this happens is provided as supplementary material. When the appropriate droplet volume is reached, it can be easily transferred using a light puff of air (Vuong et al 2015) from the well to a microscope slide (Fig. 1B) where the approach previously reported (Cheong et al 2013) is used to bring the concentrated nanoparticles to the edge of the circular coverslip for microscopic imaging.…”

“…However, this same effect has the capacity to engender movement of the droplet on the surface even with the slightest amount of tilt. The use of SH wells has been found to offer a ready solution to the undesired movement problem (Vuong et al 2015). We adapt a low cost and practical technique for enhanced collection of nanoparticles by coupling SH evaporation to the squeeze flow approach.…”

Contact angle hysteresis analysis on superhydrophobic surface based on the design of channel and pillar models

“…Most reported studies have applied superhydrophobic surfaces to increase the extent of hysteresis on neighboring hydrophobic or hydrophilic regions [7]. In recent years, with the rapid development of science and technology, ultra-precision machining technology is promising for potential applications in the hydrophobic surface field [8].…”

A superhydrophobic manhole for drops

“…In the absence of any holes, the drops were found to roll off inclines to the horizontal that were no greater than 20 (see Fig. In attempting to attain high pre-concentration it may be possible to adopt a multiple drop cascade approach, wherein drops that fell through the top substrate holes can be gently moved 22 to merge together and then made to undergo the evaporation process again over another hole. On the other hand, when placed on the 2 mm hole of the ne SH mesh substrate, there was a signicant increase in the ability of the drop to be retained without any rolloff (see Fig.…”