Multifunctional Superhydrophobic Composite Coatings with Remarkable Passive Heat Dissipation and Anticorrosion Properties

Abstract

Effective surface passive heat dissipation and durable superhydrophobicity are highly desired for promoting more flexible applications of power-intensive energy systems of aluminum and aluminum-based composites. Herein, we developed a simple and universal approach to fabricate durable superhydrophobic composite coatings composed of hexamethyldisilazane-modified silicon carbide nanowires (HMDS-SiCNWs) and fluorosilicone (FSi) resin. The as-prepared superhydrophobic coating on aluminum substrates exhibited excellent water-repellent property, stain repellency, corrosion resistance, and outstanding mechanical durability, largely due to the hierarchical micro-/nanoscale structure and low surface energy created by HMDS-SiCNWs on the FSi resin matrix. The coatings maintained superhydrophobic after exposure to harsh conditions such as knife scraping, tape peeling, and immersing in boiled water and liquid nitrogen for 1 h. When functioned on an Al radiator for a constant 18 W heat source, such a coating can decrease the temperature by as much as 10 °C and improve the cooling efficiency by up to 10%. Therefore, the combined passive heat dissipation and superhydrophobic multifunctional coating shows promising application in heat exchange systems which are required to be exposed to harsh external environments.

Optimizing the Superhydrophobicity of the Composite PDMS/PUA Film Produced by a R2R System

“…In nature, there are many examples of superhydrophobic surfaces possessing this special self-cleaning property such as butterfly wings, shark skin, and lotus leaves. − It is revealed that this property of the lotus leaf or the “Lotus effect” results from the rough morphology and the hydrophobic epicuticular wax covering the entire surface leaf. − Inspired by this discovery, many researchers have mimicked the “Lotus effect” by designing and fabricating artificial superhydrophobic surfaces using the combination of micro/nano or hierarchical morphologies and low surface energy materials. − However, besides the elemental factors constituting the superhydrophobicity of a surface-like surface roughness and hydrophobic material coating, the superhydrophobic surface has to be transparent for applications requiring high optical transmittance like solar cell panel protection . Therefore, several strategies for fabricating flexible transparent superhydrophobic structures have been reported.…”

Facile Fabrication of Robust and Fluorine-Free Superhydrophobic PDMS/STA-Coated Cotton Fabric for Highly Efficient Oil-Water Separation

“…Since the discovery of the lotus leaf effect [17], superhydrophobic materials with high water repellency abilities can achieve self-cleaning [18], anti-corrosion [19], anti-biofouling [20], anti-fogging [21] and oil-water separation [22], and so on. Preparation of superhydrophobic materials with oil-water separation ability have become a research topic.…”

Fabrication of a Superhydrophobic SiO2 Coating with Anticorrosive Protection

“…In these above obtained properties, people can pay more attention to protect the matrix from the impurity. Numerous studies have shown that the common preparation methods for superhydrophobic coatings includes etching‐modified, sol‐gel, electrical desposition, laser process and hydrothermal in‐situ growth [19,20] . For example, Tang et al [21] .…”

“…Numerous studies have shown that the common preparation methods for superhydrophobic coatings includes etchingmodified, sol-gel, electrical desposition, laser process and hydrothermal in-situ growth. [19,20] For example, Tang et al [21] used a laser chemical method to ablate and assist in the decomposition of stearic acid on 316 L stainless steel to obtain superhydrophobic micropatterns, with an optimal sample contact angle of 153.9°. The obtained superhydrophobic surface can capture air and form cavitation in the multi-layer structure, so as to prevent the infiltration of external substances and improve the corrosion resistance.…”