Magnetorheological Fluid Based on Carbonyl Iron Particles Surface-Modified with Hydroxyapatite: Dual Optimization of...

Area of Science:

• Materials Science
• Nanotechnology
• Rheology

Background:

• Magnetorheological fluids (MRFs) require simultaneous high sedimentation stability and yield strength.
• Interfacial interactions between magnetic particles and carrier liquids are key to MRF performance.
• Current MRFs face challenges in balancing stability and strength.

Purpose of the Study:

• To enhance the sedimentation stability and yield strength of MRFs.
• To investigate the effect of hydroxyapatite (HAP) modification on carbonyl iron particles (CIPs).
• To explore the interfacial mechanisms between HAP-modified CIPs and poly(dimethylsiloxane) (PDMS).

Main Methods:

• Surface modification of CIPs with HAP using a wet chemical method.
• Preparation of HAP/CIP MRFs by dispersing modified particles in PDMS.
• Systematic investigation of sedimentation stability and rheological properties.
• Utilizing molecular dynamics (MD) and first-principles simulations for theoretical insights.

Main Results:

• HAP/CIPs demonstrated improved thermal stability and acid corrosion resistance over pure CIPs.
• HAP/CIP MRFs exhibited significantly enhanced sedimentation stability, yield strength, and storage modulus compared to standard CIP MRFs.
• Simulations revealed stronger interfacial electronic interactions and more stable microstructures between HAP and PDMS.

Conclusions:

• HAP modification effectively strengthens and stabilizes the interface between CIPs and PDMS.
• The enhanced interfacial properties directly translate to improved sedimentation stability and rheological performance in MRFs.
• This study provides a viable strategy for developing advanced, high-performance MRFs through interfacial engineering.