制备纳米二氧化钛(TiO2)分别和729.6,1 004.5,1 168.5 nm 3种粒径的磷酸锆碟片(ZrP)混合纳米悬浮液,研究了混合悬浮液的分散稳定性.运用稳定性性分析仪,沉降实验和紫外-可见分光光度计综合分析了纳米悬浮液的分散稳定性,并测量了混合悬浮液的粘度.结果表明,加入ZrP碟片后,TiO2悬浮液的粘度增大,稳定性提高;3种混合纳米悬浮液的粘度相近,但ZrP粒径最小的混合悬浮液,其分散稳定性最好.通过分析发现,3种混合纳米悬浮液中,ZrP粒径越小,颗粒团聚粒径和团聚速度越小,其原因可能是ZrP碟片的粒径越小,相同质量浓度条件下碟片数目浓度越大,对TiO2的空间位阻作用越强.
Suspensions of mixed titania (TiO2) nanoparticles with zirconium phosphate (ZrP) nanoplatelets with diameters of 729.6, 1 004.5 and 1 168.5 nm were prepared.Dispersion stability of the suspensions was studied by Turbiscan LAB, sedimentation experiments and UV-Vis spectrophotometer.Viscosity of the suspensions was measured as well.Results show that the viscosity and stability of TiO2 suspension was enhanced by adding the ZrP nanoplatelets.The viscosity of the three mixed suspensions was found to be close to one another and the stability of the mixed suspension with the smallest ZrP was the best.It is found that the diameter and aggregation rate of particle aggregates decreased with decreasing diameter of ZrP nanoplatelets.The possible reason is that the steric hindrance for TiO2 nanoparticles by smaller ZrP nanoplatelets was greater because of higher number density of platelets at the same mass concentration.
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