Study on the Wettability and Optical Properties of Polydimethylsiloxane-SiO2 Nano-composite Surfaces

ADMT Journal

دوره 13، شماره 4، اسفند 2020، صفحه 21-29   

نوع مقاله: Original Article

شناسه دیجیتال (DOI): 10.30495/admt.2020.1894890.1177

نویسندگان

Reza Abedinzadeh^{* 1}؛ Hamid Shirian¹؛ Janan Parhizkar²

¹Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Isfahan, Iran

²Nanotechnology Laboratory, Department of Chemistry, University of Isfahan, Isfahan, Iran

چکیده

In this paper, the effects of different weight percentages of silica nano-particles on the wettability and optical properties of polymer based surfaces were investigated. The Polydimethylsiloxane (PDMS)-SiO₂ nano-composites containing 0.5, 1, 2, 3 and 4 wt% silica were prepared and coated on the fabric surfaces by immersion technique at the ambient conditions. Then, the characterization of nano-composite coated samples was carried out by water contact angle technique, scanning electron and atomic force microscopes and diffuse reflectance spectroscopy. It was found that increasing the silica content caused to increase the water contact angle of sample to 158° which results in an improvement in the water repellency property. This can be due to the aggregation of silica nano-particles which led to higher surface roughness of sample. The AFM and SEM images validated the results of surface roughness. However, Silica-PDMS composite coated sample exhibited a lower transmittance value (57%) in comparison to the uncoated sample (90%). This can be ascribed to the light scattering by silica nano-particles.   

کلیدواژه‌ها

Polydimethylsiloxane؛ SiO2 Nano-Particles؛ Super-Hydrophobic؛ Transmittance؛ Water Contact Angle

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