What is the role of silane coupling agents in modifying the rheological properties of Fe3O4/CNT silicone oil-based magnetic liquids?

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Topic
Silane coupling agents are used to modify the surface of Fe3O4/CNT composite particles in silicone oil-based magnetic liquids. These agents can influence the interactions between particles and the carrier liquid, thereby affecting the rheological properties of the magnetic liquid. The study investigates the effects of three different silane coupling agents: γ-aminopropyltriethoxysilane (550), γ-methacryloxypropyltrimethoxysilane (570), and phenyltrimethoxysilane (7030).
Answer
Silane coupling agents play a crucial role in modifying the rheological properties of Fe3O4/CNT silicone oil-based magnetic liquids by altering the surface energy and interactions of the composite particles. The study found that different silane coupling agents affect the viscosity, magneto-viscous effect, and shear-thinning behavior of the magnetic liquids. Specifically, Fe3O4@7030 exhibited the best visco-thermal performance due to the benzene ring structure reducing the symmetry of the molecular chains, while Fe3O4@570 showed the most significant magneto-viscous effect due to the long-chain structure enhancing the steric hindrance of the magnetic particles.
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