Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (07): 817-821.doi: 10.3866/PKU.WHXB20050724

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Preparation of Poly(ethylene glycol)-coated Carbonyl Iron Particles for Aqueous Magnetorheological Suspension

LI Li-chun; GUAN Jian-guo; CHENG Hai-bin; TAO Jian-qing   

  1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070
  • Received:2004-11-16 Revised:2005-02-22 Published:2005-07-15
  • Contact: GUAN Jian-guo

Abstract: A novel magnetorheological (MR) suspension is based on the mixture of poly(ethylene glycol)-coated carbonyl iron particles, prepared by the co-sol-gel reaction using carbonyl iron particles as raw materials, and water without any additive. The microstructure, magnetic and magnetorheological properties of the core-shell particles are characterized by SEM、TEM、FT-IR、VSM. The results show that the particles prepared have core-shell structure with a polymer shell of less than 100 nm; both the core-shell particles and its water based MR suspension exhibit excellent soft magnetic performance; the water based MR suspension shows low zero viscosity and high MR effects, especially greatly improved anti-settlement and redispersibility. The phenomena are attributed to the hydrophilic thin shell of the core-shell particles.

Key words: Water-based magnetorheological fluid, Carbonyl iron powder, Sol-gel, Core shell particle