Alizadeh Hanie, Pal Rajinder
Department of Chemical Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada.
Nanomaterials (Basel). 2025 Jun 22;15(13):966. doi: 10.3390/nano15130966.
The steady shear rheology of suspensions of mixtures of rod-shaped cellulose nanocrystals (NCC) and spherical starch nanoparticles (SNPs) was investigated experimentally over a broad range of NCC and SNP concentrations. The NCC concentration varied from about 1 to 6.7 wt% and the SNP concentration varied from 5 to 30 wt%. The suspensions of mixtures of NCC and SNPs were pseudoplastic (shear-thinning) in nature. The viscous behavior of suspensions of mixtures of NCC and SNPs could be described adequately using the power-law model. The power-law parameters, that is, consistency index and flow behavior index, were dependent on the concentrations of both NCC and SNPs. The consistency index increased substantially with increases in NCC and SNP concentrations. The flow behavior index generally decreased with an increase in NCC and SNP concentrations; that is, the suspension mixtures became more shear-thinning with increases in NCC and SNP concentrations. However, the dependence of the consistency index and flow behavior index on NCC concentration was much stronger as compared with the SNP concentration.
在广泛的纳米纤维素晶须（NCC）和球形淀粉纳米颗粒（SNP）浓度范围内，对棒状纳米纤维素晶须（NCC）与球形淀粉纳米颗粒（SNP）混合物悬浮液的稳态剪切流变学进行了实验研究。NCC浓度从约1 wt%变化到6.7 wt%，SNP浓度从5 wt%变化到30 wt%。NCC和SNP混合物的悬浮液本质上是假塑性的（剪切变稀）。使用幂律模型可以充分描述NCC和SNP混合物悬浮液的粘性行为。幂律参数，即稠度指数和流动行为指数，取决于NCC和SNP的浓度。稠度指数随着NCC和SNP浓度的增加而大幅增加。流动行为指数通常随着NCC和SNP浓度的增加而降低；也就是说，随着NCC和SNP浓度的增加，悬浮液混合物变得更加剪切变稀。然而，与SNP浓度相比，稠度指数和流动行为指数对NCC浓度的依赖性要强得多。
