Improved magneto-viscoelasticity of cross-linked PVA hydrogels using magnetic nanoparticles

摘要

Graphical abstractIn this work, we report the effect of magnetic nanoparticles in cross-linked PVA matrix. The static and dynamic viscoelastic investigation confirms that the mechanical properties of the magnetic gel are improved. Tunable viscoelastic properties of magnetic gels make it very useful for the development of a device with enhanced performance.Display OmittedAbstractMagnetic nanoparticle (MNP) incorporation in soft host media offers great possibilities to control its properties and flow dynamics via external magnetic field. In the present work we report, synthesis of stable homogeneous crosslinked PVA hydrogels with MNP and their detailed rheological investigations in static and dynamics modes. The measurement results were fitted with the theoretical model presented for nonlinear and transient static & dynamic flow behavior. A good agreement has been observed with theoretical predictions confirming the high dispersivity and stability of these magnetic gels. MNP align themselves in the field direction, and field-induced structures produce hindrance to uniform stress flow which causes a nonlinear viscoelastic response. The substantial enhancement in viscoelastic properties in observed with incorporation of MNP. Static mode investigations show good yielding properties which increases with increase in MNP concentration