Elaboration and Rheological Investigation of Magnetic Sensitive Nanocomposite Biopolymer Networks

Abstract

We propose the elaboration and study of rheological properties under continuous magnetic field of magnetic sensitive biopolymer-based nanocomposites. Magnetic iron oxide (maghemite) nanoparticles were synthesized by the polyol process and then functionalized by grafting organic bifunctional ligand for establishing electrostatic bonds between the sodium alginate chains of biopolymer and functionalized nanoparticles. The enhancement of rheological properties at low shear rate of these new magnetic soft nanocomposites was clearly demonstrated by the increase of yield stress and viscoelastic moduli in the linear viscoelastic domain with an increase of applied magnetic field, thus providing new functionality to these soft nanocomposites.

Soft magnetic nanocomposites based on adaptive matrix of wormlike surfactant micelles

“…At higher strain, the system deviates from the linear viscoelasticity: the storage modulus decreases, whereas simultaneously the loss modulus increases and then passes through maximum. This behaviour is usually associated with the breakage of chain-like structures of particles: 5,34,45 it reduces the fraction of aggregates attached to both plates of the measuring cell thus decreasing G 0 , at the same time it augments the fraction of "free" strings thereby enhancing the loss modulus G 00 . The deviations from linear viscoelasticity are more pronounced at higher strength of magnetic eld (Fig.…”

Reactive Extrusion Strategies to Fabricate Magnetite–Polyethylene Nanocomposites with Enhanced Mechanical and Magnetic Hyperthermia Properties

“…The physical and chemical properties of previously fabricated magnetic nanocomposites have been shown to be directly linked to the amount of magnetic nanoparticle fillers incorporated in the polymer matrix . A higher loading of magnetic nanoparticle fillers results in enhanced magnetic responsiveness; however, the mechanical performance of the polymer matrix is negatively impacted upon increase in nanoparticle loading .…”

“…A higher loading of magnetic nanoparticle fillers results in enhanced magnetic responsiveness; however, the mechanical performance of the polymer matrix is negatively impacted upon increase in nanoparticle loading . While the addition of low amounts of nanoparticle fillers can enhance the mechanical properties by improving stress transfer from the soft polymer matrix to the stiffer nanoparticle fillers, a higher loading of nanoparticle fillers can significantly weaken the mechanical properties due to reduced interactions between the polymer strands . Therefore, ensuring good interfacial interactions between the MNPs and PE matrix is an important factor to consider in order to preserve the mechanical properties of the polymer matrix at high filler loadings.…”

“…The physical and chemical properties of previously fabricated magnetic nanocomposites have been shown to be directly linked to the amount of magnetic nanoparticle fillers incorporated in the polymer matrix. [27][28][29][30] A higher loading of magnetic nanoparticle fillers results in enhanced magnetic responsiveness; however, the mechanical performance of the polymer matrix is negatively impacted upon increase in nanoparticle loading. [28] While the addition of low amounts of nanoparticle fillers can enhance the mechanical properties by improving stress transfer from the soft polymer matrix to the stiffer nanoparticle fillers, a higher loading of nanoparticle fillers can significantly weaken the mechanical properties due to reduced interactions between the polymer strands.…”

Perspectives on the Emerging Applications of Multifaceted Biomedical Polymeric Nanomaterials

“…Among the most researched on are those that are highly responsive to the external stimuli. A wide range of polymeric nanomaterials carrying smart switchable components has been developed over the decades [1][2][3][4][5][6][7]. For example, multistimuli responsive nanomaterials based on amphiphilic polymer composites containing hydrophilic and lipophilic macromers with environment-sensitive micellar properties have been reported [8].…”