静电辅助多孔液体的制备及特性研究

以硬模法制备的纳米中空SiO₂颗粒为腔洞结构,利用聚合咪唑阳离子与SiO₂的静电作用使SiO₂颗粒表面带正电荷,在外表面冠以磺化聚乙二醇赋予中空SiO₂颗粒流动性,制备得到静电辅助的中空二氧化硅多孔液体。性能表征表明多孔液体具有大小约为10 nm的孔径均一的球形腔洞,多孔液体的中空SiO₂含量约为13%(质量),室温条件下多孔液体的黏度为2.25 Pa·s,表现出良好的流动性。模拟结果得到聚合咪唑阳离子与中空SiO₂的吸附能为279.55 kJ/mol,证实聚合咪唑阳离子可以紧密黏附在中空SiO₂表面。采用的静电辅助表面修饰的方法为设计与制备多孔液体提供了一条新思路。

Preparation and characterization of electrostatic-assisted porous liquid

Electrostatic-assisted hollow silica porous liquid was here obtained. First, nano-hollow SiO₂ particles were prepared by hard template, which took the role of pore structures of porous liquid. Then the surface of SiO₂ particles was positively charged by the electrostatic action of the polymeric imidazolium cation. Finally, sulfonated polyethylene glycol was added on the surface of hollow SiO₂ particles to obtain the fluidity. As the characterizations of properties revealed, porous liquid had a spherical cavity with a uniform pore size of about 10 nm and the content of hollow SiO₂ in porous liquid was about 13% by mass. Porous liquid had a viscosity of 2.25 Pa·s at room temperature, which revealed a good fluidity. Simulation results showed that the physisorption energy of the most stable optimized structure was 279.55 kJ/mol, which indicated a strong interaction between hollow SiO₂ and polymeric imidazolium cation. The method of electrostatically assisted surface modification provides a new idea for designing and preparing porous liquids.