Antibody drop based handling with near-superhydrophobic mesh substrates overcomes condensation sticking

Chung, Dwayne Chung Kim; Katariya, Mayur; Zahidi, Alifa Afiah Ahmad; Lau, Chun Yat; Liew, Oi Wah; Ng, Tuck Wah

doi:10.1016/j.msec.2018.11.040

Cited by 6 publications

(4 citation statements)

References 30 publications

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“…Contrary to earlier experimental evidence showing that the soot-treated surfaces exhibited “slippery” superhydrophobic properties with drop roll off even at small inclines, fog-harvested drops are now sustained vertically on the edge of the superhydrophobic strips, providing strong evidence of wetting transition from Cassie to Wenzel states during the course of fog harvesting. Condensation-mediated wetting transitions have previously been observed for superhydrophobic surfaces. , Growth of the condensed drop ensues and eventually coalesces with an adjacent drop until it becomes too large to be held against gravity . Hence, the downward flow results in further coalescence and “clearance” of all drops into the collection tray at the bottom (Figure D) and the cycle of water harvesting is repeated.…”

Section: Resultsmentioning

confidence: 77%

“…Condensation-mediated wetting transitions have previously been observed for superhydrophobic surfaces. 30,31 Growth of the condensed drop ensues and eventually coalesces with an adjacent drop until it becomes too large to be held against gravity. 32 Hence, the downward flow results in further coalescence and "clearance" of all drops into the collection tray at the bottom (Figure 5D) and the cycle of water harvesting is repeated.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Fog Harvesting with Highly Wetting and Nonwetting Vertical Strips

et al. 2022

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Highly wetting and nonwetting substrates have been widely used in fogwater collection systems for enhanced water harvesting. In this work, fog harvesting substrates comprising PVC strips of different wetting properties and widths ranging from 1–5 mm were vertically aligned and spaced apart at regular intervals to give the same solid area fraction of 0.8. Evaluation of the water collection efficiencies of the tested configurations revealed that 1 mm wide superhydrophilic strips was the most efficient, achieving double the amount of water harvested compared with 2.8 mm wide strips. This finding was attributed to the low Stokes numbers of the aerosol particle distribution of the fog which tended to result in them being brought by the flow streamlines toward the air gaps between the strips. Stagnant flow regions at the edges of each strip, revealed through potential flow calculations, then caused higher liquid imbibition and impaction there for water harvesting. It was also found that the Cassie nonwetting substrates that originally exhibited contact angles of 161° transformed to Wenzel wetting with zero contact angle within 60 min of fog interception. Optical profilometry revealed no obvious difference in surface roughness between the central region and edges of the strips, indicating that surface morphology was unlikely to be a contributing factor for enhanced water collection at the edges. The findings here indicated that highly wetting vertical strip architectures with narrow widths (1 mm) were favorable over wider strips for water harvesting provided that clogging and re-entrainment were not significant factors.

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Section: Resultsmentioning

confidence: 77%

Section: ■ Results and Discussionmentioning

confidence: 99%

Fog Harvesting with Highly Wetting and Nonwetting Vertical Strips

et al. 2022

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“…Active air plastron thus could help restore the superhydrophobicity in situ against dynamic environments. Also, previous studies revealed that condensation could influence the non-wetting feature of passive superhydrophobic surfaces, 41,42 the strategy developed here would be effective to reduce this effect.…”

Section: Resultsmentioning

confidence: 86%

“…26 Here, the active air plastron applied through a porous superhydrophobic surface would provide a convenient strategy to control the liquid–solid contact. 17 With an unprecedentedly low contact time (Table S1, ESI†), active air plastron on a porous superhydrophobic surface will provide a robust and effective strategy for ultra-fast drop detachment or controlling the liquid–solid contact, which could be useful in a wide range of applications such as drag reduction in marine transportation for the air-cushion vessel or the amphibious aircraft, 46 manipulation or directional transportation of liquid drops (such as antigen/anti-body drops 41 ), self-cleaning, 43,47 anti-icing 45 and energy harvesting. 48…”

Section: Resultsmentioning

confidence: 99%