One-Step Aqueous Spraying Process for the Fabrication
of Omniphobic Fabrics Free of Long Perfluoroalkyl Chains
Posted on 2019-09-26 - 13:34
We report on a simple
and versatile method for the preparation
in one-step of omniphobic textiles, using only aqueous suspensions
of silica particles and polyurethane devoid of long perfluoroalkyl
chains (C8) that are now legally-banned because of severe environmental
concerns. The omniphobic coatings can be applied on different substrates
including fabrics, can resist acidic and basic conditions and a moderate
number of washing cycles, and repel liquids such as n-octane, dodecane, hexadecane, ethylene glycol, glycerol, olive oil,
and water. Analysis of the wetting properties of coated fabrics indicates
that the liquid repellence results from the trapping of air in the
re-entrant roughness created by aggregates of silica particles, together
with the low surface tension of the polyurethane which bears legally
accepted short perfluoroalkyl chains (C4). Our study is a significant
step forward toward achieving more environmentally-friendly and robust
omniphobic textiles.
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Cai, Ronggang; De Smet, David; Vanneste, Myriam; Nysten, Bernard; Glinel, Karine; Jonas, Alain M. (2019). One-Step Aqueous Spraying Process for the Fabrication
of Omniphobic Fabrics Free of Long Perfluoroalkyl Chains. ACS Publications. Collection. https://doi.org/10.1021/acsomega.9b02583