The Preparation And Performances Study Of Graphene-based Nanocomposite Self-oscillating Gels

Intelligent gel materials are a kind of biomimetic functional materials and studied widely in material science research in recent years.Due to the excellent properties,intelligent materials also have been applied in some recent emerging fields,such as artificial intelligence,intelligent robots,and flexible electronic devices.However,due to the poor physical and mechanical properties,the application of traditional gels is limited.However,mechanical and conductive properties can be greatly improved by adding graphene nanoparticles.The self-oscillating gels based on a chemical oscillation reaction can undergo physicochemical properties change autonomously,reversibly and cyclically.A great achievement has been made in the research of graphene nanocomposite gels in flexible electronic devices,biosensors and energy storage devices for the excellent electrical and mechanical properties.At the same time,the research on self-oscillating gels has also made great progress in recent years.A series of new multifunctional nanocomposites can be prepared by combining the excellent electrical and mechanical properties of graphene nanocomposites with the self-oscillating properties of self-oscillating materials.Wider application fields can be explored for the novel multifunctional materials.In this thesis,several graphene nanocomposite self-oscillating gels based on Belousov-Zhabotinsky?BZ?chemical oscillation reaction were prepared by a simple method,and their chemical structures and physical properties were characterized.The main research contents include the following three parts:1.A nanocomposite self-oscillating gels P??-CD-co-AA-co-Fe?phen?₃?/RGO were successfully prepared by the natural macromolecular?-cyclodextrin??-CD?,AA,Fe?phen?₃and RGO as raw materials.The chemical structure,morphology,thermal stability,electrical conductivity,and mechanical properties were investigated in detail.The swelling property and self-oscillating property of the gels were also studied.The results showed that the gel has good electrical conductivity and toughness.2.In this part,we fabricated a novel kind of nanocomposite self-oscillating hydrogels poly?AA-co-Fe?phen?₃?/PVA/RGO with high conductivity and good mechanical strength by dispersing reduced graphene oxide?RGO?.Due to the synergetic effect of RGO dispersed in the hydrogels or dry gels and Fe metal which is the reduction product of Fe?phen?₃ moiety by RGO,the hydrogels have a high conductivity of 18.2 S·m^-11 with 0.67 wt%of RGO content.The dispersed RGO in the hydrogels combined with the network structure by the means of hydrogen bonding,?-?stacking and electrostatic interaction,which were demonstrated to enhance the mechanical properties of the hydrogels.The elastic modulus achieves 65.2 KPa?1020%of tensile strength?and 236.4 KPa?with 70%of compression?,respectively.In addition,the prepared gels exhibit self-oscillating behavior in the BZ solution free of catalyst,and its self-oscillation amplitude can reach to 20 mV.3.A new P?AM-co-AA-co-Fe?phen?₃?/RGO nanocomposite self-oscillating gel with high electrical conductivity and good mechanical properties was prepared by in-situ polymerization method and doped reduced graphene oxide?RGO?.The results showed that the prepared gels with an ultra-high mechanical property.The compressive strength can reach4.1 MPa.