Investigation on pdms/ss superhydrophobic coating on tiles for self-cleaning application
| dc.contributor.author | Ang Xue Yong | |
| dc.date.accessioned | 2021-02-15T02:54:44Z | |
| dc.date.available | 2021-02-15T02:54:44Z | |
| dc.date.issued | 2019-07 | |
| dc.description.abstract | In recent years, superhydrophobic coating which has water repelling characteristic has gained more attention in various applications. For instance, water droplets can roll down and take dirt away from tiles with superhydrophobic surfaces for self-cleaning purpose. However, low durability of the coating is still a challenging issue that hinders its potential in practical applications. Therefore, the aim of this project is to prepare durable superhydrophobic coating with low toxicity, strong adherence to tiles and selfhealing property to extend its service life for self-cleaning application. A simple sol-gel method was used to prepare superhydrophobic coating with polydimethylsiloxane (PDMS), silica solution (SS) and epoxy resin (DGEBA). Spray-coating technique was employed to apply the superhydrophobic coating on tile substrates. The coated tile substrates were characterized via water contact angle (WCA) and tilting angle (TA) measurement, Field-Emission Scanning Electron Microscopy (FESEM), Atomic Force Microscopy (AFM) and Fourier Transform Infrared Spectroscopy (FTIR). The type of solvent used in coating preparation was investigated to produce coating with low toxicity. Among 3 types of solvent (acetone, hexane, isopropanol), tile sample coated with isopropanol-added solution acquires the highest water contact angle of 151 ±2°after UV curing for 24 hours. The effect of PDMS:SS ratio and addition of epoxy on superhydrophobicity and durability were also studied in detail. Sample coated with 1:1:0.2 (PDMS:SS:Epoxy) ratio is the optimized sample with a contact angle of 151 ±2° after UV curing. The effect of PDMS base coat addition on self-healing property was then evaluated by comparing coated samples with and without base coat. The coated samples used in this part were samples coated with the optimized formulation. The results revealed that coated sample with base coat retained its superhydrophobicity up to 3 cycles of destroying-healing process and fluctuated then after, while coated sample without base coat showed inconsistent self-healing property. The durability of coating was assessed by UV aging, pencil hardness test and peel-off test. It is proven that coated sample with PDMS base coat which has a layer-by-layer structure is durable with strong adhesion between coating and substrate and acquire a higher water contact angle of 161 ±2°, as compared to the sample without base coat. | en_US |
| dc.identifier.uri | http://hdl.handle.net/123456789/11252 | |
| dc.language.iso | en | en_US |
| dc.title | Investigation on pdms/ss superhydrophobic coating on tiles for self-cleaning application | en_US |
| dc.type | Other | en_US |
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