PEMBUATAN PERMUKAAN ULTRAHIDROFOBIK PADA BAMBU DENDROCALAMUS ASPER YANG DIMODIFIKASI OLEH TiO2 DAN OKTA FLORO 1-PENTANOL (OFP)

The aim of this research is to prepare ultrahidrophobic surface on Dendrocalamus asper bamboo by using hydrothermal method. The ultrahydrophobic surface formation was carried out in two stages: TiO2 layer making on the bamboo surface and the formation of ultrahydrophobic surfaces on TiO2 coated bamboo using of octa fluoro 1-pentanol (OFP) as surface modifier. The ultrahydrophobic surface is made by using the volume (mL) ratio of OFP and isopropanol solvent 5:20 (BT-OFP5); 10:15 (BT-OFP10); 15: 10 (BT-OFP15); 20: 5 (BT-OFP5). The result of the measurement of contact angle shows the best volume ratio between OFP and isopropanol is 10:15 (BT-OFP10) with the contact angle is 1230. The result obtained was characterized using X-Ray Diffraction (XRD) which showed that anatase crystalline phase of TiO2 was formed on bamboo. The Scanning Electron Microscopy (SEM) analysis shows the morphology of TiO2 on the bamboo surface is spherical with the average particle size of 1.6 μm. In addition, mechanical and chemical tests, self-cleaning tests, and flammability tests are also performed. The result shows that ultrahydrophobic surfaces were successfully constructed with good mechanical properties, self-cleaning properties, and flame retardancy. Keywords: Indonesian bamboo, self cleaning, ultrahydrophobic surface, anatase TiO2, hydrotherma

Fabrication of Superhydrophobic Film on the Surface of Indonesian Bamboo Timber by TiO₂ Deposition and Using Octadecyltrichlorosilane as a Surface Modifier Agent

The tropical bamboo has been widely used in modern society as a potential material for various applications. It is well known that bamboo has low durability due to its hydrophilic properties. To overcome this problem, the superhydrophobic surface on Indonesian bamboo timber had been successfully fabricated via hydrothermal deposition of an anatase TiO2 and solution immersion of octadecyltrichlorosilane (ODTS), which exhibited a maximum water contact angle (WCA) of 155°. The as-fabricated superhydrophobic bamboo timber not only showed high mechanical resistance against the abrasion of SiC sandpaper but had also been proven to possess high chemical stability after immersion in acidic and basic aqueous solutions. Moreover, the superhydrophobic bamboo timber also demonstrated excellent self-cleaning and flame-resistance properties, in comparison to pure bamboo timber. It is believed that the strategy offered in this study can increase the utilization of bamboo timber for various purposes, especially as a self-cleaning material