Adsorption Effects on the Rheological Properties of Aqueous Alumina Suspensions with Polyelectrolyte
Adsorption Effects on the Rheological Properties of Aqueous Alumina Suspensions with Polyelectrolyte
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DOI：
10.1111/j.1151-2916.1998.tb02373.x
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发表时间：
2005-01
影响因子：
3.9
通讯作者：
Lu Guo;Y. Zhang;N. Uchida;K. Uematsu
中科院分区：
文献类型：
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作者：
Lu Guo;Y. Zhang;N. Uchida;K. Uematsu
研究了吸附覆盖度和游离聚合物对含α-Al 2 O3悬浮液流变性能的影响。在所观察的剪切速率范围内，悬浮液的流动曲线很好地遵循Casson模型。Casson屈服值τc用于评价稳定性。覆盖率通过影响颗粒间的相互作用对流变性能产生了深远的影响。随着覆盖率的增加，Zeta电位增加，τc值减小。游离聚合物浓度增加到一定程度后，絮凝作用减弱。吸附的聚合物和自由聚合物对稳定性的相反影响导致存在用于稳定的最佳覆盖。当吸附覆盖度接近饱和极限时，游离聚合物的浓度迅速增加，然后游离聚合物开始主导稳定性。在不饱和吸附条件下可以实现稳定化，并且与碱性pH（9.2）下的非高亲和力吸附有关。讨论了吸附亲和力对稳定性的影响。
The influence of adsorption coverage and free polymer on the rheological properties of aqueous alumina suspensions with polyelectrolyte was studied. The flow curves of the suspensions followed the Casson model very well in the observed range of shear rate. The Casson yield value, τc, was used to evaluate the stability. The coverage exerted a profound influence on the rheological properties by affecting the interaction between particles. The zeta potential increased and the value of τc decreased as the coverage increased. The free polymer could cause weak flocculation as its concentration was increased to a certain level. The opposite effects of the adsorbed polymer and free polymer on stability resulted in the presence of optimum coverage for stabilization. The concentration of free polymer increased rapidly as the adsorption coverage approached the saturation limit, and then the free polymer started to dominate the stability. Stabilization could be achieved at a condition of unsaturated adsorption and was related to the non-high-affinity adsorption at alkaline pH (9.2). The impact of adsorption affinity on stability was discussed.