{
    "protocol": "The membranes were synthesized using Plasma Enhanced Chemical Vapor Deposition (PECVD) at an optimal plasma input power of 100 W. The synthesis involved investigating the nature of the plasma discharge, either continuous or pulsed. Characterization of the membranes included Scanning Electron Microscopy (SEM) for morphology and thickness, X-ray photoelectron spectroscopy (XPS) for chemical composition, and contact angle method for surface hydrophily/hydrophoby. For evaluating the water sorption behavior, ellipsometry and Cahn microbalance were used, while water permeability was assessed through diffusion measurements using a permeation cell.1. Clean substrates (boron-doped p-type silicon wafer and Nafion® 212) by applying a continuous plasma pre-treatment for 15 minutes at 100 W to improve adherence. 2. Set up the PECVD device with a capacitively coupled plasma reactor operating at 13.56 MHz and a discharge power fixed at 100 W. 3. Use dimethyl allylphosphonate as the precursor and argon as the gas carrier. 4. Perform the membrane deposition either in continuous or pulsed configuration, with pulsed configuration alternating between T_on (5 ms on) and T_off (5 ms off) at a frequency of 100 Hz, resulting in a duty cycle of 50%.To synthesize hydrophilic polymers with functional groups, the following experimental procedure is employed: Begin by preparing a dry sample of the polymer (50 mg for PECVD membranes or 5 mg for Nafion® 212), and place it in the measuring nacelle within a thermoregulated chamber. Prior to water sorption measurements, perform a conditioning step by passing dry nitrogen (Technical Nitrogen, Air Product) at a flow rate of 200 cm³.min⁻¹ to eliminate any moisture. Record the mass of the sample as the dry mass M₀. Subsequently, program a sequence of water vapor activity from 0.05 to 0.95, allowing the sample to reach sorption equilibrium at each level. Record the mass variation as a function of time to determine the intrinsic diffusion coefficient and sorption equilibrium using a Cahn D200 microbalance with electromagnetic compensation. The interaction between the penetrant and substrate can be analyzed through sorption isotherms using models such as DualMode or the Park model to characterize the sorption behavior."
}