含酸酐两亲硅烷偶联剂在颗粒表面吸附形成自组装单分子膜,可通过溶胶-凝胶法制备二氧化硅Janus纳米片.本文通过对二氧化硅Janus纳米片选择改性在一侧偶联氨基,制备了羧基/氨基复合的Janus纳米片.纳米片两侧的羧基与氨基具有不同的p H值响应性,表现出相应的荷电性质及润湿性.二者共同作用,引起纳米片特殊的分散和聚集行为.在较低或较高p H值水平,纳米片表现为Janus特性,分散良好.在中间p H值范围,纳米片两侧羧基、氨基相反电荷相互吸引导致层层组装聚集并沉淀. The anhydride-containing amphiphilic silane coupling agent adsorbed on the particle surface to form a self-assembled monolayer, and the silica Janus nanosheets can be prepared by the sol-gel method.In this paper, silica Janus nanosheets were selectively modified on one side and even Amino group, the carboxyl / amino composite Janus nanosheets were prepared.The carboxyl groups and amino groups on both sides of nanosheets have different p H value response, which shows the corresponding charge properties and wettability.The two work together to cause nano At the lower or higher p H level, the nanosheets behave as Janus and disperse well.In the middle p H range, the opposite charges of the carboxyl and amino groups on both sides of the nanosheet attract each other to cause the layers Assembled and precipitated.