Dynamic moduli of flocculated kaolinite sediments: effect of salinity, flocculant dose, and settling time
| Autor: | Ricardo I. Jeldres, Pedro G. Toledo, Liey-si Wong, Nelson Herrera, Eder C. Piceros, Williams H. Leiva |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Flocculation
Materials science Polymers and Plastics Settling time Sediment 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Viscoelasticity 0104 chemical sciences Salinity Colloid and Surface Chemistry Settling Rheology Materials Chemistry Kaolinite Physical and Theoretical Chemistry Composite material 0210 nano-technology |
| Zdroj: | Colloid and Polymer Science. 296:1935-1943 |
| ISSN: | 1435-1536 0303-402X |
| Popis: | Oscillatory rheological assays are used to determine the viscoelastic properties of flocculated kaolinite sediments over a range of sodium chloride concentration, flocculant dose, and settling time. The plunger method is used to promote efficient mixing between flocculant, particles, and electrolytes, ensuring the least amount of disturbance in the system. The suspensions are prepared at natural pH, varying salt concentration and flocculant dose, and then allowed to settle for a pre-set time. The sediment is then subjected to oscillatory rheological tests under small amplitude oscillatory shear (SAOS) and large amplitude oscillatory shear (LAOS) regimes. It is very remarkable that the viscoelastic moduli respond differently depending on the variable being examined; on the one hand, the salinity changes the internal structure of the floc network conforming the sediment by adopting liquid-like characteristics as salinity increases, on the other hand, different flocculant doses and settling times lead to unaltered floc network architectures. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink