Facile stearic acid modifications of alumina nanoparticles for superhydrophobic coating

Noppakhate  JIRABORVORNPONGSA; Naris  SUPAJANYA; Pornapa  SUJARIDWORAKUN

doi:10.55713/jmmm.v36i4.2632

ผู้แต่ง

Noppakhate JIRABORVORNPONGSA Metallurgy and Materials Science Research Institute, Chulalongkorn University, Bangkok 10330, Thailand; Center of Excellence on Photocatalysts for Clean Environment and Energy, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand
Naris SUPAJANYA Department of Materials Science, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand
Pornapa SUJARIDWORAKUN Center of Excellence on Photocatalysts for Clean Environment and Energy, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand; Department of Materials Science, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand; Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, Bangkok 10330, Thailand

DOI:

https://doi.org/10.55713/jmmm.v36i4.2632

คำสำคัญ:

Superhydrophobic coating, Surface modification, Stearic acid, alumina, Polydimethylsiloxane

บทคัดย่อ

In this study, alumina nanoparticles were modified with stearic acid (SA) dissolved in ethanol solution via facile techniques, which were soaking and refluxing. The effects of these modification techniques on the thermal behaviors and the functional groups of the SA-modified alumina were investigated. Stearic acid was successfully modified onto alumina nanoparticles using both techniques. In comparison, the refluxing technique yielded a higher degree of SA modification, corresponding to a grafting density of 2.59 molecules·nm^‒2, which is approximately twice that of the soaking technique. Then, the SA-modified alumina via refluxing technique was mixed with polydimethylsiloxane (PDMS) and spray coated on glass slides. The effects of coating layers and the SA-modified alumina content on the wettability and optical property were studies. The 4-layered coating containing 10 wt% of SA-modified alumina exhibited superhydrophobic property with a water contact angle of 150.0° and the contact angle hysteresis of 6.2°. It also showed excellent self-cleaning performance. However, transmittance of 4-layered coating reduced dramatically. The results showed that increasing the number of coating layers enhanced surface wettability but adversely affected optical transmittance due to increased light scattering. Therefore, a balance between wettability and optical transparency must be considered. These findings indicated that SA-modification effectively enhanced the hydrophobicity of alumina particles, and the incorporation of these SA-modified particles introduced sufficient roughness to further improve hydrophobicity. The progress in the surface modification and the utilization of a spray coating method highlight the potential for scalable and facile fabrication of superhydrophobic coating.

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