(186h) Wetting Behavior in Water + CiPj and Water + C3P1 + Tetradecane Systems

Binary systems, water + C₃P₁, water + C₃P₂, water + C₄P₁, water + C₄P₂ and water + C₄P₃, were chosen to perform the surface/interface tension measurements over the experimental temperature ranging from 10 to 40 °C at the normal pressure by pendent drop method. The symbol C_iP_j is the abbreviation of a oxypropylene glycol ether CH₃(CH₂)_i-1(OCH₂CH(CH₃))_jOH. It is found that there is a wetting transition from partial wetting to complete wetting in the system water+C₃P₂. The water + C₃P₁ system exhibits complete wetting and the other three systems of water + C₄P_j exhibit partial wetting in the temperature window ranging from 10 to 40 °C. In the ternary system, water + C₃P₁ + tetradecane, the middle surfactant phase undergoes a sequence of wetting transitions: complete wetting → partial wetting → complete wetting in the three-liquid-phase-coexisting region driven from lower critical solution temperature to upper critical solution temperature. In addition, the phase equilibrium data of this ternary system were also measured by the gas chromatography at 25, 35 and 45 °C.