How does the molecular structure of silane coupling agents influence the viscosity-temperature properties of Fe3O4/CNT silicone oil-based magnetic liquids?

Label:chem

Topic
The viscosity of magnetic liquids is influenced by the molecular structure of the silane coupling agents used for surface modification. The study investigates how different functional groups (amino, methacryloxy, phenyl) and chain lengths of silane coupling agents affect the viscosity-temperature behavior of Fe3O4/CNT silicone oil-based magnetic liquids.
Answer
The molecular structure of silane coupling agents significantly influences the viscosity-temperature properties of Fe3O4/CNT silicone oil-based magnetic liquids. The study found that Fe3O4@7030 exhibited the lowest activation energy (13.56 kJ/mol), attributed to the rigid structure of the benzene ring in 7030, which disrupts the symmetry of the silane chains and reduces the cooperativity of segmental motion. This results in enhanced low-temperature stability. In contrast, Fe3O4@550 and Fe3O4@570, with linear chain structures, showed higher activation energies (14.26 kJ/mol and 13.63 kJ/mol, respectively), indicating poorer viscosity-temperature stability.
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