Martyanov I N, Savinov E N, Klabunde K J
Department of Chemistry, Kansas State University, Manhattan, KS 66506, USA.
J Colloid Interface Sci. 2003 Nov 1;267(1):111-6. doi: 10.1016/s0021-9797(03)00678-7.
Investigation of TiO(2) aqueous suspensions has shown that their optical spectra can be unstable, with instability not related to precipitation or adherence of TiO(2) particles to the vessel walls. Increase of ionic strength of the suspension as well as neutralization of charged TiO(2) particles via pH adjustment accelerates the optical density drop. Vice versa, increasing the charge of TiO(2) particles via shifting pH in acidic or basic directions stabilizes the suspension's optical spectra, and ultrasonic treatment promotes optical density recovery. The observed behavior is attributed to alteration in the size of the suspension aggregates.
对TiO₂水悬浮液的研究表明，其光谱可能不稳定，这种不稳定性与TiO₂颗粒的沉淀或附着在容器壁上无关。悬浮液离子强度的增加以及通过调节pH值对带电TiO₂颗粒的中和会加速光密度下降。反之，通过向酸性或碱性方向改变pH值来增加TiO₂颗粒的电荷会使悬浮液的光谱稳定，并且超声处理会促进光密度恢复。观察到的这种行为归因于悬浮聚集体尺寸的变化。
