Rheology of thermo-gelling capillary suspensions
| Autor: | Chaiwut Gamonpilas, Amit Ahuja |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Materials science Aqueous solution Yield (engineering) Polymers and Plastics Capillary action 02 engineering and technology Dynamic mechanical analysis Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Suspension (chemistry) Colloid and Surface Chemistry Rheology Chemical engineering chemistry Materials Chemistry Particle Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Colloid and Polymer Science. 299:165-176 |
| ISSN: | 1435-1536 0303-402X |
| DOI: | 10.1007/s00396-020-04772-8 |
| Popis: | Rheological measurements were performed to examine the behavior of thermally responsive capillary suspensions. These capillary suspensions were prepared by dispersing laponite nanoparticles in a continuous oil phase and an immiscible secondary fluid consisting of an aqueous solution of a thermogelling polymer, Pluronic F127 (PF127). The addition of PF127 (which undergoes sol-gel transition at elevated temperatures) into the secondary phase resulted in a capillary-networked suspension whose rheology can be tailored by increasing the temperature above the gelling temperature of PF127. We investigated the yielding behavior of this system using dynamic oscillatory measurements at different temperatures. These suspensions yield via a two-step process which was observed as two distinct plateaus for storage modulus in a typical plot of storage modulus versus oscillation strain. This yielding behavior is attributed to the rupturing of the bicontinuous network structure at lower strains which is followed by the breakup of particle aggregates at larger strains. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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