Wetting Transition from Lotus Leaf to Rose Petal using Modified Fly Ash

Mahanta, Urbashi and Khandelwal, Mudrika and Deshpande, Atul Suresh (2019) Wetting Transition from Lotus Leaf to Rose Petal using Modified Fly Ash. ChemistrySelect, 4 (27). pp. 7936-7942. ISSN 2365-6549

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We present a facile and scalable approach to develop lotus leaf as well rose petal like superhydrophobic surfaces using fly ash (an industrial waste obtained from the burning of coal). To achieve this, as‐obtained fly ash powder with wide particle size distribution (FA) was processed through sedimentation technique to obtain fly ash powder with narrower particle size distribution (FAS) and modified with two different concentrations of stearic acid (SA) and treated at two different temperatures – one each below and above melting point of SA. All samples showed superhydrophobicity, where, the water contact angle (WCA) increased with an increase in the amount of stearic acid and modification temperature. Interestingly, the water droplets roll‐off from the modified FA surfaces at a small tilting angle of 5° similar to the lotus leaf, whereas, the modified FAS surfaces exhibited high adhesion for water droplets even when inverted, as in case of the rose petal. It was seen that drying at temperature lower than melting temperature of stearic acid introduced additional roughness, yet the WCA decreased. This is investigated to understand the effect of topology and substrate nature on WCA in different wetting states.

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IITH Creators:
IITH CreatorsORCiD
Khandelwal, MudrikaUNSPECIFIED
Deshpande, Atul SureshUNSPECIFIED
Item Type: Article
Subjects: Materials Engineering > Materials engineering
Divisions: Department of Material Science Engineering
Depositing User: Team Library
Date Deposited: 24 Jul 2019 04:09
Last Modified: 24 Jul 2019 04:09
URI: http://raiith.iith.ac.in/id/eprint/5799
Publisher URL: http://doi.org/10.1002/slct.201901535
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