Hydrophobic Material: Effect of Alkyl Chain Length on the Surface Roughness

Alfa Akustia Widati, Mochamad Zakki Fahmi, Satya Candra Wibawa Sakti, Titah Aldila Budiastanti, Tri Esti Purbaningtias

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The clean technologies of self-cleaning surfaces are expanding rapidly. Highly hydrophobic coatings with strong adhesion, high durability, and dirt-free surfaces have been prepared via sol-gel deposition of SiO2-TiO2-alkylsilane. The influence of the effects of the alkyl chain length of silane on surface roughness was investigated. This deposition involved a one-layer technique to produce the rough surfaces. The bimetal oxide of SiO2-TiO2 created a high level of surface roughness. As a result, the water contact angle of the coatings increased with the increasing alkyl chain length of silane (up to C=8). However, the water contact angle decreased when the C=16 of alkylsilane was applied. It was predicted that the longer alkyl chain would cause the molecules to collapse. The higher hydrophobicity was produced by SiO2-TiO2-OTMS coatings with a water contact angle of about 140.67 ± 1.23°. The effect of the dip-coating technique (one layer and layer-by-layer) on hydrophobicity was also discussed. The results showed that coatings produced by the one-layer technique had a higher contact angle than coatings made by the layer-by-layer technique. The coatings were stable under outdoor exposure and able to hinder dirt attachment to their surfaces.

Original languageEnglish
Article number110
JournalJournal of Manufacturing and Materials Processing
Issue number5
Publication statusPublished - Oct 2022


  • SiO-TiO-alkylsilane
  • alkyl chain length
  • clean technologies
  • hydrophobic
  • self-cleaning


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