Preparation of entangled nanocellulose fibers from APMP and its magnetic functional property as matrix

► Nanocellulose fibers were prepared from poplar alkaline peroxide mechanical pulp. ► Long and entangled nanocellulose fibers were prepared by high intensity ultrasonication. ► Nanocellulose fibers were used to prepared magnetic composites as a matrix. ► An excellent dispersity of magnetic nanocellulose fibers aerogels was prepared.