**3.4 TEM studies**

The TEM image in **Figure 4(a)** shows the appearance of the typical images of grafted pine magnetic composite with acrylamide. The supporting information showed spherical nano-particles as attributed to the shape and the incorporation of the magnetic nanoparticles in the polymer matrix. **Figure 4(b)** shows the size distribution of the pine magnetite particles with a peak at 12 nm.
