relationships between dynamic contact angle and dynamic surface tension properties for linear and branched ethoxylate, ethoxysulfate, and sulfate surfactants
Answers
Answer:
Explanation:
The process of dynamic wetting of Teflon and its modification by linear and branched ethoxylates, ethoxysulfates, and sulfates has been examined via measurement of dynamic contact angles. A linear correlation between advancing dynamic contact angle and the air-liquid meso-equilibrium dynamic surface tension was observed. A value of 21 mN/m was obtained for the critical meso-equilibrium surface tension for complete dynamic wetting of Teflon. Surfactants that tend to meso-equilibrate quickly at the air-liquid interface are more effective in reducing the dynamic contact angle than those that equilibrate slowly. Branched hydrophobe surfactants exhibit better effectiveness in modifying dynamic wetting of Teflon than linear hydrophobe surfactants.