月桂酸在铁表面的等温吸附

对月桂酸在不同温度下自十二烷溶液中在铁表面的等温吸附进行了实验研究。结果表明 :在 2 98～ 32 3K的温度范围内 ,恒温搅拌 4h就基本达到了吸附平衡。在 2 98K和 32 3K两种温度下的吸附等温线均属S型曲线 ,说明月桂酸在铁表面形成了表面反胶团或发生了合作吸附。用以两阶段吸附模型为基础的吸附等温线通用公式处理 2种温度下的吸附实验数据 ,结果表明实验值与拟合曲线有较好的一致性。热力学计算表明 :月桂酸在铁表面的缔合过程不是熵驱动的过程 ,故形成的表面缔合物是表面反胶团 ,其聚集数约为 3;极性基间的极性相互作用或氢键作用在表面反胶团形成过程中起主要作用。

Isothermal adsorption of dodecanic acid on iron

The isothermal adsorption of dodecanic acid from dodecane solution on iron has been measured under different temperature. The experiment results show that the adsorption equilibrium is obtained after 4 h isothermal stirring during the temperature from 298 K to 323 K. The adsorption isotherms under 298 K and 323 K are S shape, these indicate that dodecanic acid forms surface inverse micelles on iron or leads to cooperative adsorption. The adsorption experiment data under two temperature are handled using the general formula of adsorption isotherm based on two stages adsorption model, the results show that the experiment data are in good accordance with the theoretical curve. Thermodynamical calculation results indicate that surface association process of dodecanic acid on iron is not an entropy drive process, so the association material on iron is surface inverse micelle, the gathering amount is about 3. The polar mutual action between polar groups and hydrogen bond action plays a chief role in forming the surface inverse micelle. [