Preparation Of Dopamine And Tannic Acid Based Materials With Multifunctional And Their Properties Tuning

Dopamine and tannic acid are important materials inspired by mussel adhesion.Due to their unique chemical structure and biological properties,dopamine and tannic acid have been widely used in the preparation of wettable surfaces and hydrogel materials.However,in practical applications,there are still some problems,such as the inherent lipophilicity of the superhydrophobic surface,which is not resistant to oil stains,and the underwater superoleophobic surface needs sufficient pre-wetting.The recovery and recycling of scarce and expensive transition metal-based catalysts from product solutions is difficult to achieve during the catalytic degradation of organic dyes.The preparation of most polymer hydrogels is cumbersome and expensive.Antibacterial hydrogels not only have a single function,but long-term use leads to the generation of drug resistance.Based on this,two multifunctional materials were prepared in this paper,which can solve the above-mentioned shortcomings and endow the materials with multifunctionality.The main research content is as follows:（1）Ag/PDA@textile was developed by chemically depositing Ag particles on the textile surface using polydopamine as an adhesive layer.Ag/PDA@textile exhibits both superhydrophilicity and superoleophobicity in the air and underwater and also exhibits water absorption and oil repellency when immersed in oil.Even after a series of mechanical tests and long-term water immersion,its surface wettability is still preserved.Taking advantage of its opposite surface wettability between water and oil,Ag/PDA@textile was used as a separation membrane to effectively separate the oil/water mixture.Water permeates through the membrane and is collected into the container below,while oil is retained above the surface of the separating membrane.Ag/PDA@textile also has a high repellency to oils of low polarity but has a strong affinity for oils of high polarity,which makes it effective for separating immiscible oil/oil mixtures of different polarities.Due to the catalytic properties of Ag particles,organic dyes dissolved in water were effectively decomposed by Ag/PDA@textile under UV irradiation or in the presence of Na BH₄.Finally,due to the antibacterial properties of Ag/PDA@textile,it can significantly inhibit the growth of E.coli.（2）Conductive（σ=33.58 S/m）TA@Fe³⁺-PAA hydrogels were rapidly fabricated by activating the initiators through the dynamic redox autocatalytic pair composed of TA and Fe³⁺at ambient temperature and could be controlled by changing the concentration of Fe³⁺gelation time.The TA@Fe³⁺-PAA hydrogel exhibited self-adhesive properties at ambient temperature,with a healing efficiency of 85.21±2.00%,a tensile rate of 300%,and an electrical conductivity of 33.58 S/m.Based on these advantages,TA@Fe³⁺-PAA hydrogel,as a novel flexible and wearable strain sensor,can not only monitor large-scale movements（knuckles,wrists）in real-time but also sensitively capture many subtle movements（smile,Breathing）,even detects pressure applied by fingers and shows good stability（150 cycles）.Interestingly,the TA@Fe³⁺-PAA hydrogel also exhibited antibacterial properties.In addition,the porous structure and excellent electrical conductivity of TA@Fe³⁺-PAA hydrogel endow it with efficient EMI shielding performance,which helps to protect electronic devices from electromagnetic radiation.