Surface hydrophobicity: effect of alkyl chain length and network homogeneity
| Autor: | Thomas N.H. Cheng, Siti S. Ramli, Wenqian Chen, Vikram Karde, Jerry Y. Y. Heng |
|---|---|
| Přispěvatelé: | Engineering & Physical Science Research Council (EPSRC) |
| Rok vydání: | 2020 |
| Předmět: |
Technology
Engineering Chemical General Chemical Engineering 0904 Chemical Engineering Nanoparticle wettability Contact angle chemistry.chemical_compound Engineering Homogeneity (physics) Inverse gas chromatography PARTICLES SILICA NANOPARTICLES Alkyl hydrophobicity chemistry.chemical_classification Silanes Science & Technology STABILITY FREE-ENERGY OIL-RECOVERY Silane Chain length SIZE chemistry Chemical engineering surface energy silica nanoparticle GROWTH lipids (amino acids peptides and proteins) alkyl chain network |
| Popis: | Understanding the nature of hydrophobicity has fundamental importance in environmental applications. Using spherical silica nanoparticles (diameter = 369 ± 7 nm) as the model material, the current study investigates the relationship between the alkyl chain network and hydro-phobicity. Two alkyl silanes with different chain length (triethoxymethylsilane (C1) vs. trimethoxy(octyl)silane (C8)) were utilised separately for the functionalisation of the nanoparticles. Water contact angle and inverse gas chromatography results show that the alkyl chain length is essential for controlling hydrophobicity, as the octyl-functionalised nanoparticles were highly hydrophobic (water contact angle = 150.6° ± 6.6°), whereas the methyl-functionalised nanoparticles were hydrophilic (i.e., water contact angle = 0°, similar to the pristine nanoparticles). The homogeneity of the octyl-chain network also has a significant effect on hydrophobicity, as the water contact angle was reduced significantly from 148.4° ± 3.5° to 30.5° ± 1.0° with a methyl-/octyl-silane mixture (ratio = 160:40 µL·g−1 nanoparticles). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|