The yield stress and shear viscosity of the MR fluids increase by many orders of magnitude, and the suspension system changes from a Newtonian liquid to a solid-like state when a magnetic field is applied [12,13]. Their variety of applications includes magnetically-controllable devices such as ...
Aliquots of the suspension were periodically withdrawn (until 4 h). In the case of coated NPs without lipase, the suspension was precipitated and the supernatant was analyzed by TGA, in order to check the surface coating stability. In the presence of the immobilized lipase, enzyme activity was...