中文摘要：

合成了月桂酰胺丙基氧化胺（LAO）,利用p H计测定了其等电点,利用高效液相色谱仪、表面张力仪分别研究了p H和温度等因素对其在石英砂表面吸附性能的影响以及其对十二烷-水-玻璃三相接触角的影响。结果表明：LAO的等电点在p H=9左右;随着p H升高,LAO水溶液的临界胶束浓度降低;随着温度和p H的升高,LAO在石英砂表面的吸附量下降;随着LAO质量浓度的增加,十二烷-水-玻璃三相接触角先增加后减小至平衡;LAO在石英砂表面的吸附为双层吸附。

英文摘要：

Lauramidopropyl amine oxide（ LAO） was synthesized. The isoelectric point of LAO,the effect of p H and temperature on adsorption behavior of LAO on the surface of the quartz sand and the effect of LAO on contact angle of the dodecane / water / glass were systematically investigated by using p H meter,high performance liquid chromatograph and surface tension meter respectively. Results showed that the isoelectric point of LAO is close to p H of 9; the increase of p H causes the critical micelle concentration of LAO to decrease; the increase of temperature and p H causes the adsorption of LAO on the surface of quartz sand to decrease; the contact angle of the dodecane / water / glass increases firstly,and then decreases to balance by increasing the mass concentration of LAO; the adsorption mechanism of LAO on the surface of quartz sand is double layer adsorption.