Fabrication and Evaluation of Superhydrophobic Surfaces Using Carbon Soot and Different Adhesives

Abstract

The aim of this research is to create self-cleaning hydrophobic and superhydrophobic surfaces (SHS) on a glass substrate. Carbon soot has been deposited from the candle flame in order to manufacture a SHS on glass slides. The water contact angle (WCA) and roll-off angle were measured after carbon soot deposition using a test rig built in the laboratory. Further, to make SHS on glass slides more robust, candle wax and vassilline were applied on a glass substrate with or without roughening it using emery paper of grade (P80, P220 & P400). The highest WCA was 160° for a candle sooted on glass roughened with emery paper of grade P80 using vassilline as an adhesive. The mechanical durability of the prepared surfaces has been investigated using a peel-off technique with highly glue adhesive tape. The WCA was measured after each peel-off to check the changes in the degree of wettability of the fabricated surface. From the investigation, it has also been observed that more roughened glass slides show more resistance to the removal of carbon soot.

Comparative study of fabricated superhydrophobic surfaces via LST with carbon soot, chemical etching and auto-oxidation

“…Fiber laser marking machine focused laser beam of wavelength 1064 nm, frequency 50 kHz, power consumption 50%, scanning speed of 100 mm s −1 and repetition rate of 4, was carried out in ambient air (figure 7). Later the samples are left in ambient atmosphere for auto-oxidation for 10 days [10].…”

“…However, air was effectively trapped between two protruding nubs of micro/nanostructure owing to laser texturing with a p/d ratio of 1.2, which created effective gaps between the protrusions. The combined effect of mico/nanoprotrusion and low surface energy caused by air entrapment and carbon deposition is optimum and responsible for SH behaviour [10]. As a result, all subsequent characterization for textured specimens, was carried out on sample id C.4 with diameter and pitch of 100 μm and 120 μm, respectively.…”

“…Superhydrophobicity is of great interest for industrial applications as it shows important functional characteristics like antifogging [9], self-cleaning [10,11], antibacterial activity [12], drag reduction [13], high corrosion resistance [14], anti-icing and dropwise condensation [13] etc. In recent years, there is an increased impetus on developing superhydrophobic materials, through various processes like chemical etching, solution-immersion process, spray coating, LST, laser electrodeposition, template deposition [14].…”