Stanley Maribelle A, Jayaratne Jayesha S, Codd Sarah L, Bajwa Dilpreet S, Wilking James N, Seymour Joseph D
Chemical and Biological Engineering Department, Montana State University, Bozeman, MT, United States of America.
Mechanical and Industrial Engineering Department, Montana State University, Bozeman, MT, United States of America.
Appl Rheol. 2024 Jan;34(1). doi: 10.1515/arh-2024-0026.
The velocity data presented demonstrate the complicated flow behavior of nanocrystalline cellulose (NCC) suspensions even when standard rheometry shows only subtle effects. Rheo-nuclear magnetic resonance (NMR) velocimetry with spatial and temporal resolution indicates that NCC suspensions undergo varying flow behavior, which correlates with bulk rheology and includes wall-slip, shear banding, and yielding. Large-velocity fluctuations in a chiral nematic liquid crystal-phase suspension (5% w/v) indicate particle director orientation tumbling and flow. The results provide details of the mesoscale velocity distributions in space and time, which can be used to inform the interpretation of rheology data, as well as processing flow conditions to control NCC suspension microstructure and impact properties of composite and other materials.
所呈现的速度数据表明，即使标准流变学仅显示出细微影响，纳米晶纤维素（NCC）悬浮液的流动行为也很复杂。具有空间和时间分辨率的流变核磁共振（NMR）测速法表明，NCC悬浮液具有不同的流动行为，这与整体流变学相关，包括壁面滑移、剪切带化和屈服。手性向列液晶相悬浮液（5% w/v）中的大速度波动表明颗粒指向矢取向翻转和流动。结果提供了中尺度速度在空间和时间上的分布细节，可用于指导流变学数据的解释，以及控制NCC悬浮液微观结构和影响复合材料及其他材料性能的加工流动条件。
