Abstract
This study investigates the effects of stearic acid-electrosprayed coatings on commercial PTFE, PVDF, and PA membrane substrates for membrane distillation (MD). Drawing inspiration from prior research involving carbon nanotube modifications, stearic acid was selected for its ability to increase hydrophobicity and reduce heat transfer resistance. The stearic acid was electrosprayed from an ethanol solution onto the substrates, which were subsequently characterized by contact angle, liquid entry pressure, and thickness measurements. The results showed a notable flux increase of 131% for PTFE and 17% for PVDF, but a decrease of 56% for PA. A heat transfer model suggests that stearic acid improves flux by lowering heat transfer resistance in PTFE and PVDF substrates. This study highlights the potential of stearic acid coatings to enhance MD performance, providing valuable insights into improving flux and energy efficiency in MD applications.
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