Abstract
Stable oil-in-water Pickering emulsions were successfully developed via the simplest approach: amine-terminated polydimethylsiloxane with very high viscosity and low surface free energy was encapsulated by glycerol functionalized silica NPs using a rotor-stator device. The factors affecting the Pickering emulsions performance were investigated. At a certain process (silica NPs concentration: 3 wt%, Oil/water ratio: 1:20, emulsifying speed: 15,000 rpm, emulsifying time: 5 min), it gave smaller and more stable emulsions. Then the Pickering emulsion was applied on plain weave cotton and polyester fabrics through conventional pad-dry-cure method. The coated substrates showed superhydrophobicity and maintained good water-repellency even after 30 standard laundering cycles, which are attributed to the synergistic effect of low surface free energy composite and hierarchical roughness. By contrast, fabrics coated with classical emulsifiers stabilizing Pickering emulsion adopting the same recipes were quickly wetted by liquid droplets.
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