研究目的
To investigate how different coatings on solar glass reduce the initial adhesion forces between the surface of PV modules and SiO2 spheres, which simulate dust particles, and to understand the effects of relative humidity on these forces.
研究成果
Bare solar glass exhibits the highest adhesion forces with strong humidity dependence. Coatings, particularly those with high surface roughness like Coating 2 and Teflon, show reduced adhesion forces and minimal humidity influence, suggesting potential for reducing soiling and cementation. Surface roughness is more critical than surface energy in minimizing adhesion, but effectiveness depends on particle size and shape.
研究不足
The study used only one type of particle (20 μm SiO2 spheres), so results may not generalize to other particle sizes or shapes. Electrostatic interactions were not addressed. Absolute adhesion force values varied between experiments, possibly due to inaccurate force constants or dynamic measurement conditions. Some custom coatings were contaminated before roughness measurements could be completed.
1：Experimental Design and Method Selection:
Used atomic force microscopy (AFM) with force-distance (F-z) measurements to quantify adhesion forces between SiO2 spheres attached to AFM cantilevers and coated glass surfaces. The study varied relative humidity (RH) from 15% to 80% to assess van der Waals and capillary forces.
2：Sample Selection and Data Sources:
Samples included bare solar glass, commercial coatings (Coating 1, Coating 2, Coating 3), Teflon, TiO2 crystal, UV-treated Si, and custom coatings from collaborators. SiO2 spheres (20 μm diameter) were used to simulate dust particles.
3：List of Experimental Equipment and Materials:
AFM system (Bruker Dimension 3100 with Nanoscope V controller), cantilevers with attached SiO2 spheres, saturated K2SO4 salt solutions for RH control, deionized water, various coating materials.
4：Experimental Procedures and Operational Workflow:
Performed F-z measurements inside an AFM enclosure. Controlled RH using salt solutions, waited for equilibrium, and conducted dynamic measurements as RH increased. Measured adhesion forces, contact angles, and surface roughness for each sample.
5：Data Analysis Methods:
Adhesion force calculated as F = k * Δz, where k is the cantilever force constant and Δz is deflection. Analyzed trends in adhesion force with RH, compared across samples, and correlated with surface roughness and contact angle measurements.
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