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Vol. 5 (2018)

A New Magnetorheological Composite Gel and Its Controllable Rheological Behaviour

September 11, 2018


A series of magnetorheological composite gels (MRCG) were prepared using carbonyl iron powder as the magnetic particles, a complex of methyl silicone oil and gelatin/agaropectin colloids as the matrix and various additives. The rheological behaviour of the samples was tested using a rheometer in rotary and oscillatory shear modes. The results demonstrate that rheological behaviour is significantly dependent on the colloid content of the matrix. The shear yield strength increases with increasing colloid content of the matrix and reaches a maximum of 92.1 kPa. The linear viscoelastic range of the MRCG is almost independent of colloid content. In addition, the shear storage modulus of the MRCG increases with increasing colloid content, and the maximum value of the change in absolute modulus is 2.526 MPa. Adding nanosized SiO2 can significantly improve the shear yield stress and broaden the controllable range of the MRCG under a magnetic field.


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