以气相二氧化硅为原料，利用3-氯丙基三甲氧基硅烷及其衍生季铵盐对纳米二氧化硅颗粒进行改性，得到一系列与不同链长硅氧烷偶联的改性纳米二氧化硅颗粒，并对二氧化硅颗粒的表面性质以及泡沫性质进行研究。结果表明，经过改性后的纳米二氧化硅颗粒具有更优良的分散性质，团聚粒径由未改性时的459 nm减小至改性后的255 nm；纳米二氧化硅颗粒涂层的水接触角实验表明，硅烷偶联剂的碳链长度与颗粒接触角存在关联，并且接触角接近90°的颗粒对月桂酰胺丙基甜菜碱起泡剂的稳泡效果越好，降低起泡剂溶液表面张力的能力也越强。

Fumed silica is modified by 3-chloropropyl trimethoxysilane and its derivative quaternary ammonium salt to obtain a series of modified nano silica particles coupling with siloxane with different chain length.The surface properties and foam properties of modified nano silica particles are studied.The results show that the modified nano silica particles have better dispersion properties than before modification.The dynamic light scattering (DLS) results show that the size of agglomeration decreases to 255 nm from 459 nm for unmodified one.The water contact angles experiment discloses that the contact angle is related to the carbon chains length of silane coupling agent.Meanwhile,the particles with a contact angle close to 90° can bring to a better foam stabilization efficiency to lauryl propyl betaine and has a stronger ability to cut down surface tension of foaming agent solution.

孙傲(1989-),男,博士生,研究方向为油气井工作液化学的研究,sunsunaoao@126.com