聚多巴胺辅助两性离子聚合物界面组装制备水润滑纳米涂层

亲水和低摩擦表面涂层在生物植入体及医疗器械方面有着很广泛的应用，为发展简单、通用的涂层制备方法，本文作者采用聚多巴胺辅助共沉积技术，将壳聚糖基两性离子共聚物组装到材料表面，制备了超亲水、低摩擦和抗污染水润滑纳米涂层，考察了聚合物浓度对共沉积复合涂层的厚度、亲水性和润滑性的影响. 结果表明:随着聚合物浓度的增大，涂层厚度略有下降；该涂层在纯水及不同生物介质中表现出优异的润滑性能(摩擦系数μ为0.015)和抗污染性能. 该方法适用于多种惰性材料表面(金属、陶瓷和聚合物等)，有望用于生物植入体、医用导管等表面制备多功能水润滑纳米涂层. 

Polydopamine Assisted Co-Assembly for Fabrication of Zwitterionic Polymer Nanocoating with Efficient Aqueous Lubrication

Low friction and hydrophilic surfaces have critical applications in biomedical devices and implants. This work reports a facile and universal method to prepare hydrophilic, low friction and antifouling coating by dopamine assisted codeposition of chitosan graft zwitterionic copolymer. The effects of polymer concentration on the thickness, hydrophilicity and lubricity of co-deposited coatings were investigated. The results show that the coating thickness decreases slightly with the increase of polymer concentration. The codeposited coating shows superior lubrication performance (friction coefficient μ is 0.015) and antifouling in pure water as well as biological fluids. Furthermore, the versatility of this strategy allows fabrication of lubricious polymer coatings on diverse materials surfaces. This multifunctional coating may find important applications in biomedical devices and implants.