Technical Briefs

Investigations Into Superhydrophobicity of a Soot Surface Attributed to Nano-Asperities

[+] Author and Article Information
N. N. Sharma

e-mail: nitinipun@gmail.com
Department of Mechanical Engineering,
BITS Pilani, Rajasthan 333031, India

1Corresponding author.

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF Micro AND Nano-Manufacturing. Manuscript received April 12, 2012; final manuscript received November 23, 2012; published online March 22, 2013. Assoc. Editor: Ashutosh Sharma.

J. Micro Nano-Manuf 1(1), 014502 (Mar 22, 2013) (3 pages) Paper No: JMNM-12-1023; doi: 10.1115/1.4023288 History: Received April 12, 2012; Revised November 23, 2012

Superhydrophobicity in nature is the result of multiscale (hierarchical) roughness which consists of nano-asperities superimposed on micrometer scale roughness. A low-cost superhydrophobic surface was prepared by depositing soot on Vaseline coated glass substrates. The surface was rapidly prepared without any sophisticated fabrication facilities. The surface exhibited a remarkably high water contact angle of 161 deg and a roll-off angle of 3 deg. Atomic force microscopy (AFM) of the surface was done which revealed a very rough surface. The roughness features with nano-asperities superimposed on micrometer scale roughness enhance the water repellency. The micrometer scale peaks on the surface support the water droplet in a Cassie–Baxter state with the nano-asperities sheltering a composite interface below the droplet. The work of adhesion for the surface was also low at 18 nJ. The study will enable easy preparation of a cost effective superhydrophobic surface.

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Grahic Jump Location
Fig. 1

Contact angle measurement of a 5 μl drop placed on paraffin entrapped soot surface

Grahic Jump Location
Fig. 2

Contact angle measurement of a 5 μl drop placed on the paraffin wax entrapped soot surface

Grahic Jump Location
Fig. 3

The surface and profile plots from AFM of soot fixed on Vaseline coated substrate. Scan area of 10 μm × 10 μm, which shows the skewness of peaks.

Grahic Jump Location
Fig. 4

The scan area of 1 μm × 1 μm shows a more even distribution of peaks and valleys



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