Preparation of large-area durable superhydrophobic coating using dual spray confocal technology, facing self-cleaning photovoltaic surfaces

Research Overview: According to the study published in Volume 222, Part A of Progress in Organic Coatings (January 2027), Navami Sunil et al. proposed a scalable dual spray confocal preparation method using boehmite derived from gibbsite as raw material to construct large-area durable superhydrophobic coatings. The target applications include self-cleaning photovoltaic surfaces and multifunctional surfaces. This study focuses on the scalability of coatings from raw materials to film-forming processes, as well as their durability performance under large-area preparation conditions.

Key points of process and materials

Research adopts dual spray confocal technology to deposit boehmite based materials into a film by spraying, forming a superhydrophobic surface.

. Abstract information shows that this method emphasizes the two characteristics of “scalable” and “large-area”, which means that the process route is not limited to small area experimental samples, but is oriented towards actual surface engineering needs. Boehmite is derived from trihydrate alumina and belongs to inorganic aluminum based materials. Its surface morphology and chemical properties are the basis for constructing superhydrophobic micro nano structures. The study also listed self-cleaning photovoltaics as an application scenario, indicating that the coating needs to maintain surface functionality under outdoor lighting, pollution deposition, and other conditions.

Significance for the polymer additive industry

From the perspective of polymer aging and stabilization technology, the value of this research lies not in directly providing a certain additive formula, but in highlighting the comprehensive durability issues faced by large-area coatings during outdoor service.

. To maintain long-term self-cleaning ability of superhydrophobic surfaces, the chemical structure and microstructure of the coating must resist light, heat, water vapor, and pollutant erosion, which is closely related to the design of weather stability. For coating systems containing organic components, polymer aging can alter surface energy and damage rough structures, thereby weakening hydrophobicity and self-cleaning effects; Therefore, introducing an antioxidant system into similar systems to suppress oxidative degradation during processing and use, combined with HALS and UVA to build light stable protection, is a common approach to extend the lifespan of outdoor coatings. The inorganic boehmite based superhydrophobic layer and organic polymer coating used in this study have different aging mechanisms, but their large-scale construction and durability evaluation methods have reference significance for the validation of composite systems. When the stabilizer system needs to simultaneously consider processing stability and long-term weather resistance, laboratory sample data is often insufficient to reflect the actual performance of large-area coatings. Therefore, the scalable preparation process and area related durability testing have become important links in formula screening. For coatings aimed at photovoltaic self-cleaning, if combined with polymer substrates in the future, the stabilization scheme also needs to consider compatibility with surface micro and nano structures to avoid the migration or precipitation of additives that can damage hydrophobic properties.

Boundary to be noted

This source is a journal research paper, and the abstract information does not disclose specific formula ratios, aging test duration, and quantitative durability data. The above discussion on antioxidant systems, HALS, UVA, and composite systems is based on column domain correlation analysis, not the original conclusion.

. Readers should refer to the full text data of the paper when citing.

Information source:Scalable confocal dual-spray fabrication of durable large-area superhydrophobic coatings using gibbsite-derived boehmite for self-cleaning photovoltaic and multifunctional surfaces， Organized by Herun Chemical.