Magnetorheological Properties of Aqueous Ferrofluids

スポンサーリンク

概要

• 論文の詳細を見る

• The nanosized magnetite particles were synthesized by means of a coprecipitation method and used to prepare the aqueous ferrofluids with various volume fractions. The magnetorheological properties of the aqueous ferrofluids have been investigated as a function of magnetic field. Under steady-state shear, the apparent viscosity for all of the ferrofluids exhibited a shear thinning behavior. But the Bingham model was invalid since the ferrofluids did not show a yield stress before they began to flow. However, the shear stress increased linearly with shear rate after a critical shear rate, showing a Bingham-like behavior. A Bingham-like yield stress, which was obtained by extrapolating the shear stress to the zero shear rate, increased with both the volume fraction of magnetic particles and the strength of magnetic field. The Bingham-like viscosity was approximately independent of the magnetic field at a given volume fraction of magnetic particles, but increased with the volume fraction under a given magnetic field. In the strain sweep experiment at an angular frequency of 10 rad/s, a transition from a gel-like state to a sol-like state was observed and a chain model has been proposed to qualitatively explain the mechanism of the transition. From the frequency sweep tests, it was found that there existed a plateau of storage modulus G′, which was independent of frequency but dependent on the volume fraction. A scaling law has been proposed to correlate the G′ plateau with the volume fraction.

• 一般社団法人　日本レオロジー学会の論文
• 2006-02-15

著者

• Li Lin

  School Of Electrical Engineering North China Electric Power University

• Chen Guang

  School Of Mechanical And Aerospace Engineering Nanyang Technological University

• YANG Yongbo

  School of Mechanical and Aerospace Engineering, Nanyang Technological University

• LI Weihua

  School of Mechanical, Materials, and Mechatronic Engineering, Faculty of Engineering, University of Wollongong

• Yang Yongbo

  School Of Mechanical And Aerospace Engineering Nanyang Technological University

• Li Weihua

  School Of Mechanical Materials And Mechatronic Engineering Faculty Of Engineering University Of Wollongong

関連論文

• Dissolution Enhancement of Artemisinin with β-Cyclodextrin
• Faults and Improvement of Point-matched Time Domain Finite Element Method(Special Issue to the Asia-Pacific Symposium on Applied Electromagnetics and Mechanics (APSAEM06))
• Thermoreversible Association and Gelation of Methylcellulose in Aqueous Solutions
• Preparation, characterization and dissolution behavior of artemisinin microparticles
• Thermoreversible Association and Gelation of Methylcellulose in Aqueous Solutions
• Magnetorheological Properties of Aqueous Ferrofluids
• Telekin induces apoptosis associated with the mitochondria-mediated pathway in human hepatocellular carcinoma cells
• Viscoelastic properties of MR shear thickening fluids

スポンサーリンク