A Superhydrophobic Coating Based on Onion-Like Carbon Nanoparticles
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rhydrophobic Coating Based on Onion-Like Carbon Nanoparticles M. K. Eseeva, S. N. Kapustina*, D. S. Lugvishchukb, V. Z. Mordkovichb, and N. L. Lyakha a
b Technological
Northern (Arctic) Federal University, Arkhangelsk, 163002 Russia Institute for Superhard and Novel Carbon Materials, Troitsk, Moscow, 108840 Russia *e-mail: [email protected] Received May 26, 2020; revised July 31, 2020; accepted July 31, 2020
Abstract—For the first time, a superhydrophobic coating based on onion-like carbon was synthesized by an economically feasible and scalable method was obtained. Two simple and easily reproducible methods of application are proposed. The possibility of using such coating to detect the composition and humidity of the air as well as its anti-icing properties are studied. Keywords: superhydrophobicity, onion-like carbon, chemical sensor. DOI: 10.1134/S1063785020110206
nanostructures. The OLC agglomerates were were dried up and milled, and a fraction of 0.1–0.120 mm was sieved. The resulting powder was placed on the surface of the protected sample, covered with doublesided tape, after that the OLC agglomerates were ground with the same sample until a uniform coating was created. The second way involved applying a coating without using an adhesive layer, which is much more technologically advanced than the method proposed in [5]. Using a 3-min treatment with an MEF 93.1 ultrasonic disperser, we obtained a suspension of
1120
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Relative frequency
The size of onion-like carbon nanoparticles (onion-like carbon, OLC) [1] allows to use them for the Lotus effect reproduction — the main method for obtaining protective superhydrophobic coatings. The initial method of OLC synthesis was annealing of detonation nanodiamonds [2], while the cost of OLC was relatively high. Mordkovich et al. [3] proposed a method for the synthesis of OLC based on the noncatalytic partial oxidation of natural gas. The method makes it possible to obtain 100 g/h of OLC at a hydrocarbon feedstock consumption of 1.7 nm3/h, which can serve as the beginning of the semi-industrial application of these nanoobjects. Figure 1 shows the size distribution of the synthesized OLC nanoparticles. The goal of the research was to find a way to create a self-cleaning surface made of a promising material and to study its properties. The hydrophobic properties of the obtained coating were measured using a DSA20E instrument; the contact angle of wetting was determined using the tangential method. Distilled water was used; the droplet volume was 0.12 μL. The morphology of the coating was studied by electron microscopy using Vega 3 TESCAN and JEM-2010 microscopes. Hereinafter, we use the term “superhydrophobic” to refer to a surface with a contact angle of wetting above 150° at an onset droplet sliding angle of less than 5° [4]. Two ways of obtaining a coating have been considered. The first approach assumed the use of the procedure [5] proposed for obtaining a superhydrophobic coating of carbon nanotubes. The advantage of using OLC over nanotubes lies in their lo
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