Open AccessA New Magnetorheological Composite Gel and Its Controllable Rheological Behaviour
Author(s) -
Chengbin Du,
Bing Liu,
Fei Guo,
Guangchuang Yu
Publication year - 2018
Publication title -
journal of modern mechanical engineering and technology
Language(s) - English
Resource type - Journals
ISSN - 2409-9848
DOI - 10.31875/2409-9848.2018.05.9
Subject(s) - rheology , materials science , colloid , rheometer , magnetorheological fluid , viscoelasticity , composite material , composite number , silicone oil , shear modulus , dynamic mechanical analysis , shear (geology) , shear stress , gelatin , polymer , chemical engineering , magnetic field , chemistry , biochemistry , physics , quantum mechanics , engineering
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.