Research On Electrodeposition Technology Of Biopolymer And Their Nanocomposites

The electrodeposition of stimuli-responsive biopolymers shows attractive benefits such as the simple process,the mild and reagentless conditions,and the programmable and controllable operation,and it also provides opportunities to co-deposit various biological materials and nanomaterials.Thus,it can be widely applied in antimicrobial coatings,protein addressing,nanomaterials assembling,biosensors,biofuel cells,and drug delivery.In this work,we researched on the electrodeposition of carboxymethyl cellulose and researched on the preparation of nanosilver/carboxylated chitosan nanocomposite films by electrodeposition.Carboxymethyl cellulose?CMC?has been broadly used in various fields ranging from pharmacy to lithium batteries because of its excellent properties such as the environmental friendliness,the good solubility,its low cost and biocompatibility.It should be noted that CMC possesses abundant carboxyl and hydroxyl groups,which enable the capability to coordinate to transition metals.In this work,we first investigated the electrodeposition method for carboxymethyl cellulose based on the coordination of CMC to the metal ions,and we prepared the CMC/Cu²⁺hydrogel film with a smooth and homogeneous surface by the direct electrodeposition of carboxymethyl cellulose.Moreover,the electrodeposition of carboxymethyl cellulose possesses temporal and spatial controllability and selectivity,and it is very convenient to construct carboxymethyl cellulose membranes of different shapes.In addition,the electrodeposited CMC hydrogel film shows antibacterial activities against E.coli and S.aureus,which are promising for applications in bioactive antibacterial coatings.More interestingly,the CMC electrodeposition provides the possibility to directly build sensors and detectors for electrochemical detection.Therefore,the CMC electrodeposition developed in this study can be potentially applied in surface coatings,functional films,and sensors.In this work,we researched on the preparation of nano silver/carboxylated chitosan complex film via in situ coordinated electrodeposition method by making use of carboxylated chitosan as the reducer and stabilizer for nano silver particles.Moreover,the nano silver particles prepared by this method are monodispersed and the average size of the nano silver is approximately 10.0 nm.In addition,this method shows attractive benefits such as the programmable and controllable operation,which is beneficial to construct composite membranes of different shapes and thicknesses.Therefore,this work provides a new method for the preparation of nano-silver and the construction of natural polymer nano-composite membranes,which is simple to operate,easy to control and environmentally friendly.Moreover,in this work,the ZnS quantum dots/gelatin nanocomposite were prepared by a facile one-pot method by making use of gelatin as the capping and stabilizing agents.The method presents various advantages such as the simple and environmentally-friendly process,the mild condition,no need for organic solvent and no post-treatment for the product.Especially,in this method gelatin can not only serve as the capping reagent,but can also confer the thermo-responsive sol-gel transition property to the resulting QDs/gelatin nanocomposite.The QDs/gelatin nanocomposite with thermo-responsive sol-gel transition properties can be enlisted to produce fluorescent QDs/gelatin gel beads,and the release behavior of the QDs in the nanocomposite bead can be controlled by the thermal stimuli.Furthermore,the QDs/gelatin nanocomposite is able to be directly used for the fluorescent cell imaging.Therefore,this study develops a novel and facile one-pot method to generate the QDs/gelatin nanocomposite that has potential applications in controlled release,fluorescent labeling,and bioimaging.