纳米氢氧化铝的分散与水悬浮液流变研究

碳分制备的纳米氢氧化铝（ATH）吸水质量高达200g，质量分数12.9%的水悬浮液是黏度极高的时变性非牛顿流体。应用激光粒度仪和一种流变方法筛选了分散剂，研究了添加分散剂前后水悬浮液的流变性质，结果表明小分子试剂对ATH水悬浮液流变没有显著作用，而聚电解质等对纳米ATH有良好的分散和稀化作用。添加优化分散剂后的上述悬浮液黏度降低3个数量级以上，成为牛顿流体，黏度与改进的Einstein公式计算结果吻合，对上述现象进行了分析，并获得质量分数高达60%的高浓度水悬浮液。添加分散剂极大改善了纳米ATH悬浮液的后加工/处理状态，并节省了设备和能源投入。流变方法筛选、定量分散剂快速简易。

Dispersion and rheology studies for the nano alumina trihydroxide aqueous suspension

Alumina trihydroxide(ATH) particles size from the carbonation precipitation is in the nano-range and its water demand reaches 200g and its aqueous suspension with 12.9% mass fraction is a very sticky time-dependent Non-Newtonian fluid.The laser particle analyzer and a rheology method are used to select dispersants for the suspension.The rheologies of the suspension wtih/without dispersant are investigated and the result show that polyelectrolyte change viscosity a lot,while the reagents of the low molecular weight have little effect.Added with optimum dispersants,the suspension turns into the Newtonian fluid and its viscosity decreases more than three orders of magnitude and can be calculated with modified Einstein formulation.The mentioned phenomena are discussed and a concentrated aqueous suspension with 60% mass fraction is obtained.The dispersant improves the suspension rheology so much that the ATH and its derivates' equipment investment and energy cost reduce greatly during its production and application processes.The rheology method can be used to select the dispersant and to research the agglomeration quickly and accurately.