With growing concern for environmental issues associated with the use of chemicals and nanomaterials to
achieve membrane hydrophobicity, polydimethylsiloxane has emerged as a promising and eco-friendly alternative.
However, few studies have explored the application of pure PDMS solutions through dip coating to
achieve hydrophobicity in membranes designed for membrane distillation; a process which demands the
membranes possess specific porosity and pore size characteristics. This study explored how dip coating with
different PDMS concentrations affected the hydrophobicity and physical properties of glass fiber membranes.
Increasing the concentration of polydimethylsiloxane up to 15% resulted in a stepwise rise in hydrophobicity, but
the functionality as a membrane was compromised when the concentration reached 20%. Hydrophobicity on the
membrane surface was higher with 15% PDMS treatment than on the chemically grafted membrane, but the
latter demonstrated superior performance in the membrane distillation process. Nevertheless, the study confirms
the potential of the pure PDMS-coated membrane as a viable option for membrane distillation, with the possibility
of enhancing performance through improvements in pore size and surface morphology.