氢氧焰燃烧合成纳米二氧化钛颗粒及其分散行为

采用氢氧焰燃烧法合成分散均匀、团聚程度低的纳米TiO2颗粒,采用离子型共聚物改性剂处理制备分散稳定、黏度低的纳米TiO2水性分散体系,借助X射线衍射、比表面积、红外光谱、透射电镜和zeta电位分析等手段,研究纳米TiO2颗粒的晶相、形貌、粒径分布及表面电荷。结果表明:燃烧嘴中心环氢气含量、分散剂用量及pH值对纳米TiO2团聚程度影响较大,当氢气流量控制在1.52 m3/h、水性体系分散剂的质量分数为7.5%、pH控制在8时,纳米TiO2分散性能最佳。

Dispersion Behavior of TiO2 Nano-particles Synthesized by H2-O2 Combustion Flame

TiO2 nano-particles with low-aggregation were synthesized by H2-O2 combustion flame.A well-dispersed aqueous solution system with low-viscosity was obtained by treating TiO2 nano-particles with ionic copolymer.XRD,specific area,FTIR,TEM,laser particle sizer and zeta potential were utilized to study the crystalline phase,morphology,size distribution and surface charge of TiO2 nano-particles.It was concluded that the hydrogen content of central burner,the mass fraction of dispersant and pH value had great effect on the degree of aggregation of particles.Under the condition of hydrogen content of 1.52 m3/h,mass fraction of dispersant of 7.5% and the pH value controlled at 8.0,TiO2 nano-particles with the optimal dispersion were obtained.