Preparation And Electrochemical Properties Of Magnetic Nanocomposite Hydrogels

In recent years,ferric oxide as a representative nanomaterials has become an ideal candidate material for the construction of magnetic hydrogels due to its good magnetic response and biocompatibility.The addition of hydrogels can not only improve mechanical properties,but also expand its application.At the same time,as a high-capacity active material,it has great advantages in flexible supercapacitors.The addition of gold-sulfur bond makes the gel have self-repairing performance.The research content of this thesis is as follows:?1?Gold-modified ferroferric oxide nanoparticles?Fe₃O₄@Au?are used to adsorb a molecule containing sulfur and a double bond N,N-bis?acryloyl?cystamine?BACA?as a crosslinking center,and acrylamide is Monomer synthesis A magnetic nanocomposite hydrogel with dual response self-healing?Fe₃O₄@Au/BACA/PAAm?.We systematically studied the mechanical properties of hydrogels covalently crosslinked by magnetic nanocomposite particles and polyacrylamide,and the mechanical properties of ordinary physical crosslinked magnetic nanocomposite hydrogel were significantly improved.Since the hydrogel combines the magnetocaloric effect of ferroferric oxide and the photothermal property of gold particles,when subjected to external excitation by light and magnetism,the dynamic reversible gold-sulfur bond exchanges,thereby causing the gel to self-repair.The hydrogel was loaded with doxorubicin?DOX?to study drug release under infrared light irradiation and magnetic field conditions.?2?Based on Fe₃O₄@Au/BACA/PAAm hydrogel,and the pyrrole monomer was adsorbed by swelling,and the pyrrole was induced to polymerize in the hydrogel network structure to obtain Fe₃O₄@Au/BACA/PAAm./PPy electrode,Fe₃O₄@Au/BACA/PAAm was soaked in Na₂SO₄ to make an electrolyte.Then the electrodes and electrolytes are assembled into all-solid supercapacitors and systematically explore the electrochemical performance and self-healing of all solid supercapacitors.?3?The Co₃O₄/C composite using ZIF-67 single source precursor was firstly synthesized by two-step calcination.Then,the Co₃O₄/C/polyacrylamide?Co₃O₄/C/PAAm?composite hydrogel was fabricated by incorporating Co₃O₄/C composite into the PAAm network through a free radical polymerization.With in-situ anchoring of polypyrrole nanoparticles into the above hydrogel framework,a novel kind of Co₃O₄/C/PAAm-PPy hydrogel electrode was synthesized.