From high magnetization ferrofluids to nano-micro composite magnetorheological fluids: properties and applications

摘要

Recent results are reviewed on the synthesis and properties of highmagnetization ferrofluids and ferrofluid based magnetorheological (MR) fluids.Structural characteristics at nanometer level, colloidal behavior in specificenvironments, magnetic and flow behavior of a large variety of ferrofluids and somenewly developed nano-micro composite magnetizable fluids were evaluated bytransmission electron microscopy (TEM/HRTEM), X-ray photoelectron spectroscopy(XPS), dynamic (DLS) and static light scattering (SLS), small angle neutronscattering (SANS), small angle X-ray scattering (SAXS), vibrating samplemagnetometry (VSM), M?ssbauer spectroscopy, rheo-magnetorheometry, chemiluminiscence (CL), and differential scanning calorimetry (DSC). The paper is focusedmainly on the synthesis and properties of long-term colloidal stability and highmagnetization sealing fluids and of ferrofluid based magnetorheological fluids withimproved kinetic stability and high MR response.