Making Superhydrophobic Layer on Fleece Cotton Fabric with Catalyst Volume and Condensation Time Variation

• Main Author: Aristo Noviandri, Bhisma
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/41558
• Institution: Institut Teknologi Bandung

Hoodie jacket is one of the outerwear that is used to protect users against a variety of weather conditions that use Fleece cotton fabric materials. Fleece cotton fabrics have hydrophilic properties that absorb water easily, so that in conditions of rain the hoodie jacket cannot protect users from rainwater. Therefore the surface modification of the Fleece cotton cloth is carried out by increasing surface roughness and reducing surface tension so that it has hydrophobic or water resistant properties. Surface modification of Fleece cotton fabric is done by coating the silica layer on the surface, made through the sol-gel method using Methyltrimethoxysilane (MTMS) as a precursor, Oxalic Acid (C2H2O4), Ammonium Hydroxide (NH4OH). The suspension solution was made with variations in the volume of NH4OH 0.5 mL; 0.74 mL; 1.2 mL as a catalyst in the condensation process and variation in condensation time 1 day and 3 days. Tests carried out were measurements of contact angles and rolling angle in conditions before and after the tension test was carried out on specimens that had been coated with silica particles. The results showed that Fleece cotton fabric that has been coated with silica particles has superhidrophobic properties which are characterized by contact angles greater than 150o and are able to withstand various liquids such as water, soda, tea, milk, and juice. But when 80% to 120% strain in tension test, there is a Cassie-Baxter to Wenzel transition phenomenon and a significant reduction in the contact angle.