颗粒聚集体对两性SiO2颗粒无水泡沫表面性质的影响  

Effect of Particle Aggregates on the Surface Properties of Amphiphilic SiO2 Particles in Anhydrous Foam

作　　者：李根[1,2] 王克亮[1,2] 逯春晶[1,2] LI Gen;WANG Keliang;LU Chunjing(Department of Petroleum Engineering;Key Laboratory of Enhanced Oil Recovery(Northeast Petroleum University),Ministry of Education,Northeast Petroleum University,Daqing 163318,China)

机构地区：[1]东北石油大学石油工程学院 [2]提高油气采收率教育部重点实验室(东北石油大学),大庆163318

出　　处：《高等学校化学学报》2020年第9期2038-2045,共8页Chemical Journal of Chinese Universities

基　　金：国家科技重大专项(批准号:2017ZX05009004-005);黑龙江省普通本科高等学校青年创新人才基金(批准号:UNPYSCT-2018041)资助.

摘　　要：基于Pickering乳液模板法,合成了2种用于制备非水泡沫的不同相对两亲面积的Janus颗粒,并合成了表面均匀修饰的颗粒作为对比.通过调整油混合物的性质,对颗粒在油气表面上的行为进行了测量和对比,对颗粒团聚体在颗粒吸附中的作用进行了研究.结果表明,受颗粒表面接触角的影响,Janus颗粒的表面活性(表面张力降低能力与产生泡沫的体积)不总是大于均匀改性颗粒.均匀改性颗粒和Janus颗粒均不是以单个颗粒形式从体相吸附至表面上,而是以颗粒团聚体状态向表面移动,并且需要颗粒团聚体的Cassie-Baxter复合表面的接触角约为90°,而颗粒的本征接触角小于70.1°.Two types of Janus particles with different relative amphiphilic areas for the preparation of nonaqueous foam were synthesized.In addition,particles with uniformly modified surfaces were synthesized as contrasts.By adjusting the properties of the oil mixture,the behavior of the particles on the oil and gas surface was measured and compared,and the role of the particle agglomerates in particles adsorption was studied.Affected by the contact angle of the particle surface,the surface activity of Janus particles is not always greater than that of the uniformly modified particles,which is reflected in the surface tension reduction ability and the volume of foam generated.The particles are not adsorbed from the bulk phase to the surface in the form of mutually independent particles,but in the state of particle agglomerates.And the contact angle of the Cassie-Baxter composite surface requiring particle agglomeration is around 90°,while the intrinsic contact angle of the particles is less than 70.1°.

关 键 词：纳米颗粒 非水相 表面 聚集体 接触角 

分 类 号：O647.2[理学—物理化学]