Pal Rajinder, Pattath Karthika
Department of Chemical Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada.
Nanomaterials (Basel). 2024 Jun 29;14(13):1122. doi: 10.3390/nano14131122.
The steady rheological behavior of suspensions of solid particles thickened by cellulose nanocrystals is investigated. Two different types and sizes of particles are used in the preparation of suspensions, namely, TG hollow spheres of 69 µm in Sauter mean diameter and solospheres S-32 of 14 µm in Sauter mean diameter. The nanocrystal concentration varies from 0 to 3.5 wt% and the particle concentration varies from 0 to 57.2 vol%. The influence of salt (NaCl) concentration and pH on the rheology of suspensions is also investigated. The suspensions generally exhibit shear-thinning behavior. The degree of shear-thinning is stronger in suspensions of smaller size particles. The experimental viscosity data are adequately described by a power-law model. The variations in power-law parameters (consistency index and flow behavior index) under different conditions are determined and discussed in detail.
研究了由纤维素纳米晶体增稠的固体颗粒悬浮液的稳定流变行为。在悬浮液制备中使用了两种不同类型和尺寸的颗粒，即索特平均直径为69 µm的TG空心球和索特平均直径为14 µm的溶胶球S - 32。纳米晶体浓度从0变化到3.5 wt%，颗粒浓度从0变化到57.2 vol%。还研究了盐（NaCl）浓度和pH对悬浮液流变学的影响。悬浮液通常表现出剪切变稀行为。较小尺寸颗粒的悬浮液中剪切变稀程度更强。实验粘度数据由幂律模型充分描述。详细确定并讨论了不同条件下幂律参数（稠度指数和流动行为指数）的变化。
