Particle matrix interfacial interaction effect on the viscoelastic properties of electrolyte iron particle based...

Area of Science:

• Materials Science
• Polymer Science
• Rheology

Background:

• Magnetorheological elastomers (MREs) are smart materials whose properties change in response to a magnetic field.
• Understanding particle-matrix interfacial interaction is crucial for optimizing MRE performance.
• Grease as an additive can modify these interfacial properties.

Purpose of the Study:

• To investigate the effect of grease additive on particle-matrix interfacial interaction in MREs.
• To analyze the influence of altered interfaces on viscoelastic properties and magnetorheological (MR) effects.
• To correlate interfacial changes with structural stability and performance.

Main Methods:

• Synthesis of MREs with and without grease (MRE25G and MRE25).
• Characterization using cross-link density (CLD) measurements and electron microscopy.
• Rheological testing (storage modulus G', loss modulus G'', critical strain amplitude) under varying magnetic fields.
• Analysis of magnetisation curves, cohesive energy, and creep-recovery behavior.

Main Results:

• Grease addition decreased particle-matrix interaction and lowered G' and G'' values.
• MRE25G showed increased cohesive energy and structure stability in zero magnetic field.
• The magnetorheological (MR) effect was enhanced by 30% in MRE25G due to increased particle-particle interaction.
• Maxwell viscosity was higher in MRE25G, indicating altered flow behavior.

Conclusions:

• Grease additive significantly modifies interfacial dynamics in MREs, reducing particle-matrix friction.
• Enhanced particle-particle interaction due to grease leads to improved structural stability and a stronger MR effect.
• Interfacial interactions play a critical role in zero-field properties and contribute significantly to field-induced effects in MREs.